🔖 chore: bump version to 0.6.0 and update CHANGELOG

On startup, if `update_check_interval_hours` have elapsed since the last
check, fetches the latest release tag from the Gitea API and prints a
notice when a newer version is available. Silent on network failure or
no update found.

- New `update_check` module with injected fetcher for full testability
- Cache at ~/.cache/tmuxido/update_check.json tracks timestamp + version
- `fetch_latest_tag` and `version_compare` promoted to `pub(crate)`
- 6 unit tests covering disabled, interval not elapsed, fetch triggered,
  equal versions, update available, and current-newer edge case

.claude/settings.json

@@ -0,0 +1,16 @@
+{
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Write|Edit",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "bash -c 'if [ -f Cargo.toml ]; then if command -v cargo-nextest >/dev/null 2>&1; then cargo nextest run 2>&1; else cargo test 2>&1; fi; fi'",
+            "timeout": 120
+          }
+        ]
+      }
+    ]
+  }
+}

.dockerignore

@@ -0,0 +1,3 @@
+target/
+.git/
+.claude/

.drone.yml

@@ -0,0 +1,111 @@
+kind: pipeline
+type: docker
+name: ci
+
+trigger:
+  event:
+    - push
+    - pull_request
+
+steps:
+  - name: test
+    image: rust:latest
+    commands:
+      - cargo fmt --check
+      - cargo clippy -- -D warnings
+      - cargo test
+
+  - name: coverage
+    image: xd009642/tarpaulin
+    privileged: true
+    environment:
+      GITEA_TOKEN:
+        from_secret: gitea_token
+    commands:
+      - |
+        apt-get update -qq && apt-get install -y -qq jq curl
+        PCT=$(cargo tarpaulin 2>&1 | awk '/coverage,/{print int($1)}')
+        [ -z "$PCT" ] && PCT=0
+        if [ "$PCT" -ge 80 ]; then FILL="#4c1"
+        elif [ "$PCT" -ge 60 ]; then FILL="#dfb317"
+        else FILL="#e05d44"; fi
+        echo "PCT=$PCT FILL=$FILL"
+        printf '<svg xmlns="http://www.w3.org/2000/svg" width="120" height="20"><rect width="76" height="20" fill="#555"/><rect x="76" width="44" height="20" fill="%s"/><g fill="#fff" text-anchor="middle" font-family="sans-serif" font-size="11"><text x="38" y="14">coverage</text><text x="98" y="14">%s%%</text></g></svg>' "$FILL" "$PCT" > coverage.svg
+        CONTENT=$(base64 coverage.svg | tr -d '\n')
+        SHA=$(curl -s -H "Authorization: token $GITEA_TOKEN" \
+          "https://git.cincoeuzebio.com/api/v1/repos/cinco/Tmuxido/contents/coverage.svg?ref=badges" \
+          | jq -r '.sha')
+        jq -n --arg msg "ci: update coverage badge [CI SKIP]" \
+          --arg content "$CONTENT" --arg sha "$SHA" --arg branch "badges" \
+          '{message: $msg, content: $content, sha: $sha, branch: $branch}' \
+        | curl -fsSL -X PUT \
+          -H "Authorization: token $GITEA_TOKEN" \
+          -H "Content-Type: application/json" \
+          "https://git.cincoeuzebio.com/api/v1/repos/cinco/Tmuxido/contents/coverage.svg" \
+          -d @-
+
+---
+kind: pipeline
+type: docker
+name: release
+
+trigger:
+  event:
+    - tag
+  ref:
+    - refs/tags/[0-9]*
+
+steps:
+  - name: build-x86_64
+    image: messense/rust-musl-cross:x86_64-musl
+    commands:
+      - cargo build --release --target x86_64-unknown-linux-musl
+      - cp target/x86_64-unknown-linux-musl/release/tmuxido tmuxido-x86_64-linux
+
+  - name: build-aarch64
+    image: messense/rust-musl-cross:aarch64-musl
+    commands:
+      - cargo build --release --target aarch64-unknown-linux-musl
+      - cp target/aarch64-unknown-linux-musl/release/tmuxido tmuxido-aarch64-linux
+
+  - name: publish
+    image: alpine
+    environment:
+      GITEA_TOKEN:
+        from_secret: gitea_token
+    commands:
+      - apk add --no-cache curl jq
+      - |
+        # Delete existing release for this tag if present (handles retag scenarios)
+        EXISTING_ID=$(curl -fsSL \
+          -H "Authorization: token $GITEA_TOKEN" \
+          "https://git.cincoeuzebio.com/api/v1/repos/cinco/Tmuxido/releases/tags/$DRONE_TAG" \
+          | jq -r '.id // empty')
+        if [ -n "$EXISTING_ID" ]; then
+          curl -fsSL -X DELETE \
+            -H "Authorization: token $GITEA_TOKEN" \
+            "https://git.cincoeuzebio.com/api/v1/repos/cinco/Tmuxido/releases/$EXISTING_ID"
+        fi
+        # Read DRONE_TAG via ENVIRON inside awk to avoid Drone's ${VAR} substitution
+        # which would replace ${TAG} with an empty string before the shell runs.
+        BODY=$(awk '
+          BEGIN { tag = ENVIRON["DRONE_TAG"] }
+          /^## \[/ { in_section = (index($0, "[" tag "]") > 0); next }
+          in_section && /^## \[/ { exit }
+          in_section { print }
+        ' CHANGELOG.md)
+        RELEASE_ID=$(curl -fsSL -X POST \
+          -H "Authorization: token $GITEA_TOKEN" \
+          -H "Content-Type: application/json" \
+          "https://git.cincoeuzebio.com/api/v1/repos/cinco/Tmuxido/releases" \
+          -d "{\"tag_name\":\"$DRONE_TAG\",\"name\":\"$DRONE_TAG\",\"body\":$(echo "$BODY" | jq -Rs .)}" \
+          | jq -r .id)
+        for ASSET in tmuxido-x86_64-linux tmuxido-aarch64-linux; do
+          curl -fsSL -X POST \
+            -H "Authorization: token $GITEA_TOKEN" \
+            "https://git.cincoeuzebio.com/api/v1/repos/cinco/Tmuxido/releases/$RELEASE_ID/assets" \
+            -F "attachment=@$ASSET"
+        done
+    depends_on:
+      - build-x86_64
+      - build-aarch64

.gitignore

@@ -0,0 +1 @@
+/target

.mcp.json

@@ -0,0 +1,24 @@
+{
+  "mcpServers": {
+    "rust-mcp": {
+      "type": "stdio",
+      "command": "rust-mcp-server",
+      "args": []
+    },
+    "crates": {
+      "type": "stdio",
+      "command": "crates-mcp",
+      "args": []
+    },
+    "drone-ci-mcp": {
+      "command": "npx",
+      "args": [
+        "-y",
+        "drone-ci-mcp",
+        "--access-token=${DRONE_TOKEN}",
+        "--server-url=https://drone.cincoeuzebio.com"
+      ]
+    }
+  }
+}
+

.tmuxido.toml

@@ -0,0 +1,19 @@
+[[windows]]
+name = "tmuxido"
+
+[[windows]]
+name = "editor"
+layout = "main-horizontal"
+panes = [
+  "code . ; claude --dangerously-skip-permissions",
+  "clear",
+  "clear"
+]
+
+# [[windows]]
+# name = "build"
+# panes = []
+
+# [[windows]]
+# name = "git"
+# panes = []

.tmuxido.toml.example

@@ -0,0 +1,255 @@
+# ============================================================================
+# Project-specific tmux session configuration
+# ============================================================================
+# Place this file as .tmuxido.toml in your project root directory
+#
+# This configuration will be used when opening this specific project.
+# If this file doesn't exist, the global default_session from
+# ~/.config/tmuxido/tmuxido.toml will be used.
+#
+# Compatible with any tmux base-index setting (0 or 1)
+# ============================================================================
+
+# ============================================================================
+# BASIC EXAMPLE: Single window with one pane
+# ============================================================================
+# [[windows]]
+# name = "editor"
+# panes = []  # Empty = just open a shell in the project directory
+
+# ============================================================================
+# INTERMEDIATE EXAMPLE: Single window with multiple panes and layout
+# ============================================================================
+# This creates the classic layout:
+# - Main pane on top (nvim)
+# - Two smaller panes below, side by side
+#
+# [[windows]]
+# name = "editor"
+# layout = "main-horizontal"
+# panes = [
+#     "nvim .",      # Pane 0: Opens nvim in project root
+#     "clear",       # Pane 1: Shell ready for commands
+#     "clear"        # Pane 2: Another shell
+# ]
+
+# ============================================================================
+# ADVANCED EXAMPLE: Multiple windows for a complete workflow
+# ============================================================================
+
+# Window 1: Editor with side terminal
+[[windows]]
+name = "editor"
+layout = "main-vertical"
+panes = [
+    "nvim .",           # Main pane: Editor
+    "clear"             # Side pane: Terminal for quick commands
+]
+
+# Window 2: Development server
+[[windows]]
+name = "server"
+panes = [
+    "npm run dev"       # Auto-start dev server
+]
+
+# Window 3: Git operations
+[[windows]]
+name = "git"
+panes = [
+    "git status",       # Show current status
+    "lazygit"           # Or use lazygit if installed
+]
+
+# Window 4: Database/Logs
+[[windows]]
+name = "logs"
+layout = "even-horizontal"
+panes = [
+    "tail -f logs/development.log",
+    "docker-compose logs -f"
+]
+
+# ============================================================================
+# PRACTICAL EXAMPLES BY PROJECT TYPE
+# ============================================================================
+
+# --- Frontend React/Vue/Angular Project ---
+# [[windows]]
+# name = "code"
+# layout = "main-horizontal"
+# panes = ["nvim .", "clear", "clear"]
+#
+# [[windows]]
+# name = "dev"
+# panes = ["npm run dev"]
+#
+# [[windows]]
+# name = "test"
+# panes = ["npm run test:watch"]
+
+# --- Backend API Project ---
+# [[windows]]
+# name = "editor"
+# layout = "main-vertical"
+# panes = ["nvim src/", "cargo watch -x run"]  # For Rust
+# # Or: panes = ["nvim .", "nodemon server.js"]  # For Node.js
+# # Or: panes = ["nvim .", "python manage.py runserver"]  # For Django
+#
+# [[windows]]
+# name = "database"
+# panes = ["psql mydb"]  # Or mysql, redis-cli, etc
+#
+# [[windows]]
+# name = "logs"
+# panes = ["tail -f logs/app.log"]
+
+# --- Full Stack Project ---
+# [[windows]]
+# name = "frontend"
+# layout = "main-horizontal"
+# panes = [
+#     "cd frontend && nvim .",
+#     "cd frontend && npm run dev"
+# ]
+#
+# [[windows]]
+# name = "backend"
+# layout = "main-horizontal"
+# panes = [
+#     "cd backend && nvim .",
+#     "cd backend && cargo run"
+# ]
+#
+# [[windows]]
+# name = "database"
+# panes = ["docker-compose up postgres redis"]
+
+# --- DevOps/Infrastructure Project ---
+# [[windows]]
+# name = "code"
+# panes = ["nvim ."]
+#
+# [[windows]]
+# name = "terraform"
+# panes = ["terraform plan"]
+#
+# [[windows]]
+# name = "k8s"
+# layout = "even-vertical"
+# panes = [
+#     "kubectl get pods -w",
+#     "stern -l app=myapp",  # Log streaming
+#     "k9s"                   # Kubernetes TUI
+# ]
+
+# --- Data Science/ML Project ---
+# [[windows]]
+# name = "jupyter"
+# panes = ["jupyter lab"]
+#
+# [[windows]]
+# name = "editor"
+# panes = ["nvim ."]
+#
+# [[windows]]
+# name = "training"
+# layout = "even-vertical"
+# panes = [
+#     "python train.py",
+#     "watch -n 1 nvidia-smi"  # GPU monitoring
+# ]
+
+# ============================================================================
+# AVAILABLE LAYOUTS
+# ============================================================================
+# Layout determines how panes are arranged in a window:
+#
+# main-horizontal:  Main pane on top, others stacked below horizontally
+#   ┌─────────────────────────────┐
+#   │         Main Pane           │
+#   ├──────────────┬──────────────┤
+#   │   Pane 2     │   Pane 3     │
+#   └──────────────┴──────────────┘
+#
+# main-vertical:    Main pane on left, others stacked right vertically
+#   ┌──────────┬──────────┐
+#   │          │ Pane 2   │
+#   │   Main   ├──────────┤
+#   │   Pane   │ Pane 3   │
+#   └──────────┴──────────┘
+#
+# tiled:            All panes in a grid
+#   ┌──────────┬──────────┐
+#   │ Pane 1   │ Pane 2   │
+#   ├──────────┼──────────┤
+#   │ Pane 3   │ Pane 4   │
+#   └──────────┴──────────┘
+#
+# even-horizontal:  All panes in a row, equal width
+#   ┌────┬────┬────┬────┐
+#   │ P1 │ P2 │ P3 │ P4 │
+#   └────┴────┴────┴────┘
+#
+# even-vertical:    All panes in a column, equal height
+#   ┌──────────────┐
+#   │   Pane 1     │
+#   ├──────────────┤
+#   │   Pane 2     │
+#   ├──────────────┤
+#   │   Pane 3     │
+#   └──────────────┘
+
+# ============================================================================
+# TIPS & TRICKS
+# ============================================================================
+# 1. Commands are executed with "Enter" automatically
+# 2. Use "clear" to just open a clean shell
+# 3. Commands run in the project directory by default
+# 4. Use "cd subdir && command" to run in subdirectories
+# 5. First pane in array is pane 0 (uses the window's initial pane)
+# 6. Subsequent panes are created by splitting
+# 7. Layout is applied after all panes are created
+# 8. Empty panes array = single pane window
+# 9. You can have as many windows as you want
+# 10. Compatible with tmux base-index 0 or 1 (auto-detected)
+
+# ============================================================================
+# COMMON PATTERNS
+# ============================================================================
+
+# Pattern: Editor + horizontal terminal split
+# [[windows]]
+# name = "work"
+# layout = "main-horizontal"
+# panes = ["nvim .", "clear"]
+
+# Pattern: Vertical split with commands side by side
+# [[windows]]
+# name = "dev"
+# layout = "even-vertical"
+# panes = ["npm run dev", "npm run test:watch"]
+
+# Pattern: Monitoring dashboard
+# [[windows]]
+# name = "monitor"
+# layout = "tiled"
+# panes = [
+#     "htop",
+#     "watch -n 1 df -h",
+#     "tail -f /var/log/syslog",
+#     "docker stats"
+# ]
+
+# Pattern: Simple workflow (no special layout needed)
+# [[windows]]
+# name = "code"
+# panes = []
+#
+# [[windows]]
+# name = "run"
+# panes = []
+#
+# [[windows]]
+# name = "git"
+# panes = []

CHANGELOG.md

@@ -0,0 +1,115 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## [0.6.0] - 2026-03-01
+
+### Added
+- Periodic update check: on startup, if `update_check_interval_hours` have elapsed since
+  the last check, tmuxido fetches the latest release tag from the Gitea API and prints a
+  notice when a newer version is available (silent on network failure or no update found)
+- New `update_check` module (`src/update_check.rs`) with injected fetcher for testability
+- `update_check_interval_hours` config field (default 24, set to 0 to disable)
+- Cache file `~/.cache/tmuxido/update_check.json` tracks last-checked timestamp and
+  latest known version across runs
+
+## [0.5.2] - 2026-03-01
+
+### Added
+- Test for `detect_arch` asserting asset name follows `tmuxido-{arch}-linux` format
+
+## [0.5.1] - 2026-03-01
+
+### Fixed
+- Tmux window creation now targets windows by name instead of numeric index, eliminating
+  "index in use" and "can't find window" errors when `base-index` is not 0
+- Self-update asset name corrected from `x86_64-linux` to `tmuxido-x86_64-linux` to match
+  what CI actually uploads, fixing 404 on `--update`
+- CI release pipeline now deletes any existing release for the tag before recreating,
+  preventing 409 Conflict errors on retagged releases
+
+## [0.5.0] - 2026-03-01
+
+### Added
+- Interactive configuration wizard on first run with styled prompts
+- `lipgloss` dependency for beautiful terminal UI with Tokyo Night theme colors
+- Emoji-enhanced prompts and feedback during setup
+- Configure project paths interactively with comma-separated input
+- Configure `max_depth` for project discovery scanning
+- Configure cache settings (`cache_enabled`, `cache_ttl_hours`)
+- Configure default session windows interactively
+- Configure panes within each window with custom names
+- Configure startup commands for each pane (e.g., `nvim .`, `npm run dev`)
+- New `ui` module with styled render functions for all prompts
+- Comprehensive summary showing all configured settings after setup
+
+## [0.4.2] - 2026-03-01
+
+### Fixed
+- Version mismatch: bumped Cargo.toml version to match release tag, fixing `--update` false positive
+
+## [0.4.1] - 2026-03-01
+
+### Added
+- Self-update feature (`tmuxido --update`) to update binary from latest GitHub release
+
+## [0.4.0] - 2026-03-01
+
+### Added
+- Self-update feature (`tmuxido --update`) to update binary from latest GitHub release
+- New `self_update` module with version comparison and atomic binary replacement
+- `--update` CLI flag for in-place binary updates
+- Backup and rollback mechanism if update fails
+
+## [0.3.0] - 2026-03-01
+
+### Added
+- Dependency check for `fzf` and `tmux` at startup, before any operation
+- Automatic Linux package manager detection (apt, pacman, dnf, yum, zypper, emerge, xbps, apk)
+- Interactive installation prompt when required tools are missing
+- `deps` module with injectable `BinaryChecker` trait for unit testing without hitting the real system
+- Integration tests in `tests/deps.rs` (11 tests using real `SystemBinaryChecker`)
+- Docker test suite in `tests/docker/` with 15 scenarios simulating a fresh Ubuntu 24.04 user
+
+### Fixed
+- Release pipeline `publish` step now reads `DRONE_TAG` via awk `ENVIRON` to prevent Drone's
+  `${VAR}` substitution from wiping local shell variables before the shell runs
+
+## [0.2.4] - 2026-03-01
+
+### Fixed
+- Coverage percentage calculation in CI (correct field from tarpaulin JSON output)
+- Release pipeline trigger now matches `v*` tag format instead of `[0-9]*`
+
+## [0.2.2] - 2026-02-28
+
+### Added
+- Coverage badge generated by `cargo-tarpaulin` in CI, hosted in Gitea Generic Package Registry
+- CI status, coverage, version, and Rust edition badges in README
+
+## [0.2.1] - 2026-02-28
+
+### Added
+- Drone CI pipeline (`ci`) running `cargo fmt --check`, `cargo clippy`, and `cargo test` on every push and pull request
+
+## [0.2.0] - 2026-02-28
+
+### Added
+- Unit tests for `cache`, `session`, and `config` modules
+- Integration tests for scan, session config, and cache lifecycle
+
+### Changed
+- Refactored business logic into `lib.rs` for better testability; `main.rs` is now a thin entrypoint
+
+## [0.1.1] - 2026-02-28
+
+### Fixed
+- Removed personal path references from default configuration and examples
+
+## [0.1.0] - 2026-02-28
+
+### Added
+- Initial release of tmuxido
+

CLAUDE.md

@@ -0,0 +1,121 @@
+# Rust Project — Claude Instructions
+
+## Mandatory Rules
+
+1. **Always write tests** alongside production code — no feature ships without tests
+2. **Always verify tests pass** after every change — the PostToolUse hook runs automatically;
+   if it shows failures, fix them before moving on
+3. Run `cargo clippy -- -D warnings` and resolve all warnings
+4. Run `cargo fmt` before considering any task complete
+
+## Available MCP Tools
+
+Install with `curl -sSf https://raw.githubusercontent.com/USUARIO/claude-rust-scaffold/main/install.sh | sh`
+
+| Server | Tools | Purpose |
+|--------|-------|---------|
+| `rust-mcp` | `cargo_check`, `cargo_build`, `cargo_test`, `cargo_clippy`, `cargo_fmt`, `cargo_add` | Run cargo commands directly |
+| `crates` | search, versions, dependencies, docs | Explore crates.io and docs.rs |
+
+## Test Structure
+
+### Unit Tests — inside `src/`
+
+Place at the bottom of each source file:
+
+```rust
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn should_return_error_when_input_is_empty() {
+        // arrange
+        let input = "";
+        // act
+        let result = parse(input);
+        // assert
+        assert!(result.is_err());
+    }
+}
+```
+
+- Name tests descriptively: `should_<outcome>_when_<condition>`
+- Cover: happy path, edge cases (empty, max values), error cases
+
+### Integration Tests — `tests/` directory
+
+- One file per feature or behavior
+- Use only public interfaces (`pub`)
+- Simulate real usage end-to-end
+
+```rust
+// tests/parsing.rs
+use tmuxido::parse;
+
+#[test]
+fn parses_valid_input_successfully() {
+    let result = parse("valid input");
+    assert!(result.is_ok());
+}
+```
+
+### Snapshot Testing with `insta`
+
+For complex outputs or large structs:
+
+```rust
+#[test]
+fn renders_report_correctly() {
+    let report = generate_report(&data);
+    insta::assert_snapshot!(report);
+}
+```
+
+Review snapshots: `cargo insta review`
+
+### Property Testing with `proptest`
+
+For pure functions over wide input domains:
+
+```rust
+use proptest::prelude::*;
+
+proptest! {
+    #[test]
+    fn round_trip_encode_decode(s in ".*") {
+        let encoded = encode(&s);
+        prop_assert_eq!(decode(&encoded), s);
+    }
+}
+```
+
+## Recommended `Cargo.toml` dev-dependencies
+
+```toml
+[dev-dependencies]
+proptest = "1"
+insta = { version = "1", features = ["json", "yaml"] }
+mockall = "0.13"
+
+# if async:
+tokio = { version = "1", features = ["full", "test-util"] }
+```
+
+## Recommended Project Structure
+
+```
+tmuxido/
+├── Cargo.toml
+├── src/
+│   ├── lib.rs          # core logic (unit tests at bottom)
+│   ├── main.rs         # entrypoint (thin, delegates to lib)
+│   └── module/
+│       └── mod.rs      # #[cfg(test)] mod tests {} at bottom
+├── tests/
+│   └── integration.rs  # integration tests
+└── benches/
+    └── bench.rs        # benchmarks (optional)
+```
+
+Prefer `lib.rs` + `main.rs` split so logic stays testable independently of the binary entrypoint.

Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "tmuxido"
+version = "0.6.0"
+edition = "2024"
+
+[dev-dependencies]
+tempfile = "3"
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+toml = "0.8"
+dirs = "5.0"
+walkdir = "2.4"
+anyhow = "1.0"
+shellexpand = "3.1"
+clap = { version = "4.5", features = ["derive"] }
+lipgloss = "0.1"

README.md

@@ -0,0 +1,184 @@
+<div align="center">
+  <img src="docs/assets/tmuxido-logo.png" alt="tmuxido logo" width="200"/>
+</div>
+<div align="center">
+
+[![Build Status](https://drone.cincoeuzebio.com/api/badges/cinco/Tmuxido/status.svg)](https://drone.cincoeuzebio.com/cinco/Tmuxido)
+[![Coverage](https://git.cincoeuzebio.com/cinco/Tmuxido/raw/branch/badges/coverage.svg)](https://drone.cincoeuzebio.com/cinco/Tmuxido)
+[![Version](https://img.shields.io/gitea/v/release/cinco/Tmuxido?gitea_url=https%3A%2F%2Fgit.cincoeuzebio.com&label=version)](https://git.cincoeuzebio.com/cinco/Tmuxido/releases)
+![Rust 2026](https://img.shields.io/badge/rust-edition_2026-orange?logo=rust)
+
+</div>
+
+# tmuxido
+
+A Rust-based tool to quickly find and open projects in tmux using fzf. No external dependencies except tmux and fzf!
+
+## Features
+
+- Search for git repositories in configurable paths
+- Interactive selection using fzf
+- Native tmux session creation (no tmuxinator required!)
+- Support for project-specific `.tmuxido.toml` configs
+- Smart session switching (reuses existing sessions)
+- TOML-based configuration
+- Smart caching system for fast subsequent runs
+- Configurable cache TTL
+- Self-update capability (`tmuxido --update`)
+- Zero external dependencies (except tmux and fzf)
+
+## Installation
+
+```sh
+curl -fsSL https://git.cincoeuzebio.com/cinco/Tmuxido/raw/branch/main/install.sh | sh
+```
+
+Installs the latest release binary to `~/.local/bin/tmuxido`. On first run, the config file is created automatically at `~/.config/tmuxido/tmuxido.toml`.
+
+### Build from source
+
+```bash
+cargo build --release
+cp target/release/tmuxido ~/.local/bin/
+```
+
+## Configuration
+
+The configuration file is located at `~/.config/tmuxido/tmuxido.toml`.
+
+On first run, a default configuration will be created automatically.
+
+Example configuration:
+```toml
+# List of paths where to search for projects (git repositories)
+paths = [
+    "~/Projects",
+    # "~/work",
+]
+
+# Maximum depth to search for .git directories
+max_depth = 5
+
+# Enable project caching (default: true)
+cache_enabled = true
+
+# Cache TTL in hours (default: 24)
+cache_ttl_hours = 24
+
+# Default session configuration (used when project has no .tmuxido.toml)
+[default_session]
+
+[[default_session.windows]]
+name = "editor"
+panes = []
+
+[[default_session.windows]]
+name = "terminal"
+panes = []
+```
+
+## Usage
+
+Run without arguments to search all configured paths and select with fzf:
+```bash
+tmuxido
+```
+
+Or provide a specific directory:
+```bash
+tmuxido /path/to/project
+```
+
+Force refresh the cache (useful after adding new projects):
+```bash
+tmuxido --refresh
+# or
+tmuxido -r
+```
+
+Check cache status:
+```bash
+tmuxido --cache-status
+```
+
+Update tmuxido to the latest version:
+```bash
+tmuxido --update
+```
+
+View help:
+```bash
+tmuxido --help
+```
+
+## Requirements
+
+- [tmux](https://github.com/tmux/tmux) - Terminal multiplexer
+- [fzf](https://github.com/junegunn/fzf) - For interactive selection
+
+## How it works
+
+1. Searches for git repositories (directories containing `.git`) in configured paths
+2. Caches the results for faster subsequent runs
+3. Presents them using fzf for selection
+4. Creates or switches to a tmux session for the selected project
+5. If a `.tmuxido.toml` config exists in the project, uses it to set up custom windows and panes
+6. Otherwise, creates a default session with two windows: "editor" and "terminal"
+
+## Caching
+
+The tool uses an incremental cache to keep subsequent runs fast:
+
+- **Cache location**: `~/.cache/tmuxido/projects.json`
+- **Incremental updates**: On each run, only directories whose mtime changed are rescanned — no full rescans
+- **Manual refresh**: Use `--refresh` to force a full rescan
+- **Cache status**: Use `--cache-status` to inspect the cache
+
+The cache persists indefinitely and is updated automatically when the filesystem changes.
+
+## Project-specific Configuration
+
+You can customize the tmux session layout for individual projects by creating a `.tmuxido.toml` file in the project root.
+
+Example `.tmuxido.toml`:
+```toml
+[[windows]]
+name = "editor"
+panes = ["nvim"]
+layout = "main-horizontal"
+
+[[windows]]
+name = "server"
+panes = ["npm run dev"]
+
+[[windows]]
+name = "git"
+panes = []
+```
+
+### Available Layouts
+
+- `main-horizontal` - Main pane on top, others below
+- `main-vertical` - Main pane on left, others on right
+- `tiled` - All panes tiled
+- `even-horizontal` - All panes in horizontal row
+- `even-vertical` - All panes in vertical column
+
+### Panes
+
+Each window can have multiple panes with commands that run automatically:
+- First pane is the main window pane
+- Additional panes are created by splitting
+- Empty panes array = just open the window in the project directory
+
+## Author
+
+<div align="center">
+  <a href="https://github.com/cinco">
+    <img src="https://github.com/cinco.png" width="100" height="100" style="border-radius: 50%;" alt="Cinco avatar"/>
+  </a>
+  <br><br>
+  <strong>Cinco</strong>
+  <br>
+  <a href="https://github.com/cinco">@cinco</a>
+</div>

coverage.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="120" height="20"><rect width="76" height="20" fill="#555"/><rect x="76" width="44" height="20" fill="#e05d44"/><g fill="#fff" text-anchor="middle" font-family="sans-serif" font-size="11"><text x="38" y="14">coverage</text><text x="98" y="14">44%</text></g></svg>

install.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+set -e
+
+REPO="cinco/Tmuxido"
+BASE_URL="https://git.cincoeuzebio.com"
+INSTALL_DIR="$HOME/.local/bin"
+
+arch=$(uname -m)
+case "$arch" in
+    x86_64)        file="tmuxido-x86_64-linux" ;;
+    aarch64|arm64) file="tmuxido-aarch64-linux" ;;
+    *) echo "Unsupported architecture: $arch" >&2; exit 1 ;;
+esac
+
+tag=$(curl -fsSL "$BASE_URL/api/v1/repos/$REPO/releases?limit=1&page=1" \
+  | grep -o '"tag_name":"[^"]*"' | head -1 | cut -d'"' -f4)
+
+[ -z "$tag" ] && { echo "Could not fetch latest release" >&2; exit 1; }
+
+echo "Installing tmuxido $tag..."
+mkdir -p "$INSTALL_DIR"
+curl -fsSL "$BASE_URL/$REPO/releases/download/$tag/$file" -o "$INSTALL_DIR/tmuxido"
+chmod +x "$INSTALL_DIR/tmuxido"
+echo "Installed: $INSTALL_DIR/tmuxido"
+
+case ":$PATH:" in
+    *":$INSTALL_DIR:"*) ;;
+    *) echo "Note: add $INSTALL_DIR to your PATH (e.g. export PATH=\"\$HOME/.local/bin:\$PATH\")" ;;
+esac

rust-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "stable"
+components = ["rustfmt", "clippy"]

src/cache.rs

@@ -0,0 +1,268 @@
+use anyhow::{Context, Result};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use std::fs;
+use std::path::{Path, PathBuf};
+use std::time::{SystemTime, UNIX_EPOCH};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ProjectCache {
+    pub projects: Vec<PathBuf>,
+    pub last_updated: u64,
+    /// mtime de cada diretório visitado durante o scan.
+    /// Usado para detectar mudanças incrementais sem precisar varrer tudo.
+    #[serde(default)]
+    pub dir_mtimes: HashMap<PathBuf, u64>,
+}
+
+fn now_secs() -> u64 {
+    SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap()
+        .as_secs()
+}
+
+fn mtime_secs(time: SystemTime) -> u64 {
+    time.duration_since(UNIX_EPOCH)
+        .unwrap_or_default()
+        .as_secs()
+}
+
+/// Retorna o subconjunto mínimo de diretórios: aqueles que não têm nenhum
+/// ancestral também na lista. Evita rescanear a mesma subárvore duas vezes.
+pub(crate) fn minimal_roots(dirs: &[PathBuf]) -> Vec<PathBuf> {
+    dirs.iter()
+        .filter(|dir| {
+            !dirs
+                .iter()
+                .any(|other| other != *dir && dir.starts_with(other))
+        })
+        .cloned()
+        .collect()
+}
+
+impl ProjectCache {
+    pub fn new(projects: Vec<PathBuf>, dir_mtimes: HashMap<PathBuf, u64>) -> Self {
+        Self {
+            projects,
+            last_updated: now_secs(),
+            dir_mtimes,
+        }
+    }
+
+    pub fn cache_path() -> Result<PathBuf> {
+        let cache_dir = dirs::cache_dir()
+            .context("Could not determine cache directory")?
+            .join("tmuxido");
+
+        fs::create_dir_all(&cache_dir).with_context(|| {
+            format!("Failed to create cache directory: {}", cache_dir.display())
+        })?;
+
+        Ok(cache_dir.join("projects.json"))
+    }
+
+    pub fn load() -> Result<Option<Self>> {
+        let cache_path = Self::cache_path()?;
+
+        if !cache_path.exists() {
+            return Ok(None);
+        }
+
+        let content = fs::read_to_string(&cache_path)
+            .with_context(|| format!("Failed to read cache file: {}", cache_path.display()))?;
+
+        let cache: ProjectCache = serde_json::from_str(&content)
+            .with_context(|| format!("Failed to parse cache file: {}", cache_path.display()))?;
+
+        Ok(Some(cache))
+    }
+
+    pub fn save(&self) -> Result<()> {
+        let cache_path = Self::cache_path()?;
+
+        let content = serde_json::to_string_pretty(self).context("Failed to serialize cache")?;
+
+        fs::write(&cache_path, content)
+            .with_context(|| format!("Failed to write cache file: {}", cache_path.display()))?;
+
+        Ok(())
+    }
+
+    /// Valida e atualiza o cache de forma incremental.
+    ///
+    /// 1. Remove projetos cujo `.git` não existe mais.
+    /// 2. Detecta diretórios com mtime alterado.
+    /// 3. Resscaneia apenas as subárvores mínimas que mudaram.
+    ///
+    /// Retorna `true` se o cache foi modificado.
+    /// Retorna `false` com `dir_mtimes` vazio (cache antigo) — chamador deve fazer rescan completo.
+    #[allow(clippy::type_complexity)]
+    pub fn validate_and_update(
+        &mut self,
+        scan_fn: &dyn Fn(&Path) -> Result<(Vec<PathBuf>, HashMap<PathBuf, u64>)>,
+    ) -> Result<bool> {
+        let mut changed = false;
+
+        // Passo 1: remover projetos cujo .git não existe mais
+        let before = self.projects.len();
+        self.projects.retain(|p| p.join(".git").exists());
+        if self.projects.len() != before {
+            changed = true;
+        }
+
+        // Sem fingerprints = cache no formato antigo; sinaliza ao chamador
+        if self.dir_mtimes.is_empty() {
+            return Ok(changed);
+        }
+
+        // Passo 2: encontrar diretórios com mtime diferente do armazenado
+        let changed_dirs: Vec<PathBuf> = self
+            .dir_mtimes
+            .iter()
+            .filter(|(dir, stored_mtime)| {
+                fs::metadata(dir)
+                    .and_then(|m| m.modified())
+                    .map(|t| mtime_secs(t) != **stored_mtime)
+                    .unwrap_or(true) // diretório sumiu = tratar como mudança
+            })
+            .map(|(dir, _)| dir.clone())
+            .collect();
+
+        if changed_dirs.is_empty() {
+            return Ok(changed);
+        }
+
+        // Passo 3: resscanear apenas as raízes mínimas das subárvores alteradas
+        for root in minimal_roots(&changed_dirs) {
+            eprintln!("Rescanning: {}", root.display());
+
+            // Remover entradas antigas desta subárvore
+            self.projects.retain(|p| !p.starts_with(&root));
+            self.dir_mtimes.retain(|d, _| !d.starts_with(&root));
+
+            // Resscanear e mesclar
+            let (new_projects, new_fingerprints) = scan_fn(&root)?;
+            self.projects.extend(new_projects);
+            self.dir_mtimes.extend(new_fingerprints);
+            changed = true;
+        }
+
+        if changed {
+            self.projects.sort();
+            self.projects.dedup();
+            self.last_updated = now_secs();
+        }
+
+        Ok(changed)
+    }
+
+    pub fn age_in_seconds(&self) -> u64 {
+        now_secs().saturating_sub(self.last_updated)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs;
+    use tempfile::tempdir;
+
+    #[test]
+    fn should_return_empty_when_input_is_empty() {
+        let result = minimal_roots(&[]);
+        assert!(result.is_empty());
+    }
+
+    #[test]
+    fn should_return_single_dir_as_root() {
+        let dirs = vec![PathBuf::from("/home/user/projects")];
+        let result = minimal_roots(&dirs);
+        assert_eq!(result, dirs);
+    }
+
+    #[test]
+    fn should_exclude_nested_dirs_when_parent_is_present() {
+        let dirs = vec![
+            PathBuf::from("/home/user"),
+            PathBuf::from("/home/user/projects"),
+        ];
+        let result = minimal_roots(&dirs);
+        assert_eq!(result.len(), 1);
+        assert!(result.contains(&PathBuf::from("/home/user")));
+    }
+
+    #[test]
+    fn should_keep_sibling_dirs_that_are_not_nested() {
+        let dirs = vec![
+            PathBuf::from("/home/user/projects"),
+            PathBuf::from("/home/user/work"),
+        ];
+        let result = minimal_roots(&dirs);
+        assert_eq!(result.len(), 2);
+    }
+
+    #[test]
+    fn should_remove_stale_projects_when_git_dir_missing() {
+        let dir = tempdir().unwrap();
+        let project = dir.path().join("myproject");
+        fs::create_dir_all(project.join(".git")).unwrap();
+
+        let mut cache = ProjectCache::new(vec![project.clone()], HashMap::new());
+        assert_eq!(cache.projects.len(), 1);
+
+        fs::remove_dir_all(project.join(".git")).unwrap();
+
+        let result = cache.validate_and_update(&|_| Ok((vec![], HashMap::new())));
+        assert_eq!(result.unwrap(), true);
+        assert!(cache.projects.is_empty());
+    }
+
+    #[test]
+    fn should_return_false_when_nothing_changed() {
+        let dir = tempdir().unwrap();
+        let actual_mtime = fs::metadata(dir.path())
+            .unwrap()
+            .modified()
+            .unwrap()
+            .duration_since(std::time::UNIX_EPOCH)
+            .unwrap()
+            .as_secs();
+
+        let mut dir_mtimes = HashMap::new();
+        dir_mtimes.insert(dir.path().to_path_buf(), actual_mtime);
+        let mut cache = ProjectCache::new(vec![], dir_mtimes);
+
+        let result = cache.validate_and_update(&|_| Ok((vec![], HashMap::new())));
+        assert_eq!(result.unwrap(), false);
+    }
+
+    #[test]
+    fn should_rescan_dirs_when_mtime_changed() {
+        let dir = tempdir().unwrap();
+        let tracked = dir.path().to_path_buf();
+
+        // Store mtime 0 — guaranteed to differ from the actual mtime
+        let mut dir_mtimes = HashMap::new();
+        dir_mtimes.insert(tracked, 0u64);
+        let mut cache = ProjectCache::new(vec![], dir_mtimes);
+
+        let new_project = dir.path().join("discovered");
+        let scan_called = std::cell::Cell::new(false);
+        let result = cache.validate_and_update(&|_root| {
+            scan_called.set(true);
+            Ok((vec![new_project.clone()], HashMap::new()))
+        });
+
+        assert_eq!(result.unwrap(), true);
+        assert!(scan_called.get());
+        assert!(cache.projects.contains(&new_project));
+    }
+
+    #[test]
+    fn should_return_false_when_dir_mtimes_empty() {
+        let mut cache = ProjectCache::new(vec![], HashMap::new());
+        let result = cache.validate_and_update(&|_| Ok((vec![], HashMap::new())));
+        assert_eq!(result.unwrap(), false);
+    }
+}

src/config.rs

@@ -0,0 +1,381 @@
+use anyhow::{Context, Result};
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::PathBuf;
+
+use crate::session::SessionConfig;
+use crate::ui;
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct Config {
+    pub paths: Vec<String>,
+    #[serde(default = "default_max_depth")]
+    pub max_depth: usize,
+    #[serde(default = "default_cache_enabled")]
+    pub cache_enabled: bool,
+    #[serde(default = "default_cache_ttl_hours")]
+    pub cache_ttl_hours: u64,
+    #[serde(default = "default_update_check_interval_hours")]
+    pub update_check_interval_hours: u64,
+    #[serde(default = "default_session_config")]
+    pub default_session: SessionConfig,
+}
+
+fn default_max_depth() -> usize {
+    5
+}
+
+fn default_cache_enabled() -> bool {
+    true
+}
+
+fn default_cache_ttl_hours() -> u64 {
+    24
+}
+
+fn default_update_check_interval_hours() -> u64 {
+    24
+}
+
+fn default_session_config() -> SessionConfig {
+    use crate::session::Window;
+
+    SessionConfig {
+        windows: vec![
+            Window {
+                name: "editor".to_string(),
+                panes: vec![],
+                layout: None,
+            },
+            Window {
+                name: "terminal".to_string(),
+                panes: vec![],
+                layout: None,
+            },
+        ],
+    }
+}
+
+impl Config {
+    pub fn load() -> Result<Self> {
+        let config_path = Self::config_path()?;
+
+        if !config_path.exists() {
+            return Ok(Self::default_config());
+        }
+
+        let content = fs::read_to_string(&config_path)
+            .with_context(|| format!("Failed to read config file: {}", config_path.display()))?;
+
+        let config: Config = toml::from_str(&content)
+            .with_context(|| format!("Failed to parse config file: {}", config_path.display()))?;
+
+        Ok(config)
+    }
+
+    pub fn config_path() -> Result<PathBuf> {
+        let config_dir = dirs::config_dir()
+            .context("Could not determine config directory")?
+            .join("tmuxido");
+
+        Ok(config_dir.join("tmuxido.toml"))
+    }
+
+    pub fn ensure_config_exists() -> Result<PathBuf> {
+        let config_path = Self::config_path()?;
+
+        if !config_path.exists() {
+            let config_dir = config_path
+                .parent()
+                .context("Could not get parent directory")?;
+
+            fs::create_dir_all(config_dir).with_context(|| {
+                format!(
+                    "Failed to create config directory: {}",
+                    config_dir.display()
+                )
+            })?;
+
+            // Run interactive configuration wizard
+            let paths = Self::prompt_for_paths()?;
+            let max_depth = Self::prompt_for_max_depth()?;
+            let cache_enabled = Self::prompt_for_cache_enabled()?;
+            let cache_ttl_hours = if cache_enabled {
+                Self::prompt_for_cache_ttl()?
+            } else {
+                24
+            };
+            let windows = Self::prompt_for_windows()?;
+
+            // Render styled success message before moving windows
+            ui::render_config_created(&paths, max_depth, cache_enabled, cache_ttl_hours, &windows);
+
+            let config = Config {
+                paths: paths.clone(),
+                max_depth,
+                cache_enabled,
+                cache_ttl_hours,
+                update_check_interval_hours: default_update_check_interval_hours(),
+                default_session: SessionConfig { windows },
+            };
+
+            let toml_string =
+                toml::to_string_pretty(&config).context("Failed to serialize config")?;
+
+            fs::write(&config_path, toml_string).with_context(|| {
+                format!("Failed to write config file: {}", config_path.display())
+            })?;
+        }
+
+        Ok(config_path)
+    }
+
+    fn prompt_for_paths() -> Result<Vec<String>> {
+        // Render styled welcome banner
+        ui::render_welcome_banner();
+
+        // Get input with styled prompt
+        let input = ui::render_paths_prompt()?;
+        let paths = Self::parse_paths_input(&input);
+
+        if paths.is_empty() {
+            ui::render_fallback_message();
+            Ok(vec![
+                dirs::home_dir()
+                    .unwrap_or_default()
+                    .join("Projects")
+                    .to_string_lossy()
+                    .to_string(),
+            ])
+        } else {
+            Ok(paths)
+        }
+    }
+
+    fn prompt_for_max_depth() -> Result<usize> {
+        ui::render_section_header("Scan Settings");
+        let input = ui::render_max_depth_prompt()?;
+        Ok(ui::parse_max_depth_input(&input).unwrap_or(5))
+    }
+
+    fn prompt_for_cache_enabled() -> Result<bool> {
+        ui::render_section_header("Cache Settings");
+        let input = ui::render_cache_enabled_prompt()?;
+        Ok(ui::parse_cache_enabled_input(&input).unwrap_or(true))
+    }
+
+    fn prompt_for_cache_ttl() -> Result<u64> {
+        let input = ui::render_cache_ttl_prompt()?;
+        Ok(ui::parse_cache_ttl_input(&input).unwrap_or(24))
+    }
+
+    fn prompt_for_windows() -> Result<Vec<crate::session::Window>> {
+        ui::render_section_header("Default Session");
+        let input = ui::render_windows_prompt()?;
+
+        let window_names = ui::parse_comma_separated_list(&input);
+
+        let names = if window_names.is_empty() {
+            vec!["editor".to_string(), "terminal".to_string()]
+        } else {
+            window_names
+        };
+
+        // Configure panes for each window
+        let mut windows = Vec::new();
+        for name in names {
+            let panes = Self::prompt_for_panes(&name)?;
+            windows.push(crate::session::Window {
+                name,
+                panes,
+                layout: None,
+            });
+        }
+
+        Ok(windows)
+    }
+
+    fn prompt_for_panes(window_name: &str) -> Result<Vec<String>> {
+        let input = ui::render_panes_prompt(window_name)?;
+
+        let pane_names = ui::parse_comma_separated_list(&input);
+
+        if pane_names.is_empty() {
+            // Single pane, no commands
+            return Ok(vec![]);
+        }
+
+        // Ask for commands for each pane
+        let mut panes = Vec::new();
+        for pane_name in pane_names {
+            let command = ui::render_pane_command_prompt(&pane_name)?;
+            panes.push(command);
+        }
+
+        Ok(panes)
+    }
+
+    fn parse_paths_input(input: &str) -> Vec<String> {
+        input
+            .trim()
+            .split(',')
+            .map(|s| s.trim().to_string())
+            .filter(|s| !s.is_empty())
+            .collect()
+    }
+
+    fn default_config() -> Self {
+        Config {
+            paths: vec![
+                dirs::home_dir()
+                    .unwrap_or_default()
+                    .join("Projects")
+                    .to_string_lossy()
+                    .to_string(),
+            ],
+            max_depth: 5,
+            cache_enabled: true,
+            cache_ttl_hours: 24,
+            update_check_interval_hours: default_update_check_interval_hours(),
+            default_session: default_session_config(),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn should_use_defaults_when_optional_fields_missing() {
+        let toml_str = r#"paths = ["/home/user/projects"]"#;
+        let config: Config = toml::from_str(toml_str).unwrap();
+        assert_eq!(config.max_depth, 5);
+        assert!(config.cache_enabled);
+        assert_eq!(config.cache_ttl_hours, 24);
+        assert_eq!(config.update_check_interval_hours, 24);
+    }
+
+    #[test]
+    fn should_parse_full_config_correctly() {
+        let toml_str = r#"
+            paths = ["/foo", "/bar"]
+            max_depth = 3
+            cache_enabled = false
+            cache_ttl_hours = 12
+        "#;
+        let config: Config = toml::from_str(toml_str).unwrap();
+        assert_eq!(config.paths, vec!["/foo", "/bar"]);
+        assert_eq!(config.max_depth, 3);
+        assert!(!config.cache_enabled);
+        assert_eq!(config.cache_ttl_hours, 12);
+    }
+
+    #[test]
+    fn should_reject_invalid_toml() {
+        let result: Result<Config, _> = toml::from_str("not valid toml ]][[");
+        assert!(result.is_err());
+    }
+
+    #[test]
+    fn should_parse_single_path() {
+        let input = "~/Projects";
+        let paths = Config::parse_paths_input(input);
+        assert_eq!(paths, vec!["~/Projects"]);
+    }
+
+    #[test]
+    fn should_parse_multiple_paths_with_commas() {
+        let input = "~/Projects, ~/work, ~/repos";
+        let paths = Config::parse_paths_input(input);
+        assert_eq!(paths, vec!["~/Projects", "~/work", "~/repos"]);
+    }
+
+    #[test]
+    fn should_trim_whitespace_from_paths() {
+        let input = "  ~/Projects  ,  ~/work  ";
+        let paths = Config::parse_paths_input(input);
+        assert_eq!(paths, vec!["~/Projects", "~/work"]);
+    }
+
+    #[test]
+    fn should_return_empty_vec_for_empty_input() {
+        let input = "";
+        let paths = Config::parse_paths_input(input);
+        assert!(paths.is_empty());
+    }
+
+    #[test]
+    fn should_return_empty_vec_for_whitespace_only() {
+        let input = "   ";
+        let paths = Config::parse_paths_input(input);
+        assert!(paths.is_empty());
+    }
+
+    #[test]
+    fn should_handle_empty_parts_between_commas() {
+        let input = "~/Projects,,~/work";
+        let paths = Config::parse_paths_input(input);
+        assert_eq!(paths, vec!["~/Projects", "~/work"]);
+    }
+
+    #[test]
+    fn should_use_ui_parse_functions_for_max_depth() {
+        // Test that our UI parsing produces expected results
+        assert_eq!(ui::parse_max_depth_input(""), None);
+        assert_eq!(ui::parse_max_depth_input("5"), Some(5));
+        assert_eq!(ui::parse_max_depth_input("invalid"), None);
+    }
+
+    #[test]
+    fn should_use_ui_parse_functions_for_cache_enabled() {
+        assert_eq!(ui::parse_cache_enabled_input(""), None);
+        assert_eq!(ui::parse_cache_enabled_input("y"), Some(true));
+        assert_eq!(ui::parse_cache_enabled_input("n"), Some(false));
+        assert_eq!(ui::parse_cache_enabled_input("maybe"), None);
+    }
+
+    #[test]
+    fn should_use_ui_parse_functions_for_cache_ttl() {
+        assert_eq!(ui::parse_cache_ttl_input(""), None);
+        assert_eq!(ui::parse_cache_ttl_input("24"), Some(24));
+        assert_eq!(ui::parse_cache_ttl_input("invalid"), None);
+    }
+
+    #[test]
+    fn should_use_ui_parse_functions_for_window_names() {
+        let result = ui::parse_comma_separated_list("editor, terminal, server");
+        assert_eq!(result, vec!["editor", "terminal", "server"]);
+    }
+
+    #[test]
+    fn should_parse_config_with_windows_and_panes() {
+        let toml_str = r#"
+            paths = ["/projects"]
+            max_depth = 3
+            cache_enabled = true
+            cache_ttl_hours = 12
+
+            [default_session]
+            [[default_session.windows]]
+            name = "editor"
+            panes = ["nvim .", "git status"]
+
+            [[default_session.windows]]
+            name = "terminal"
+            panes = []
+        "#;
+        let config: Config = toml::from_str(toml_str).unwrap();
+        assert_eq!(config.paths, vec!["/projects"]);
+        assert_eq!(config.max_depth, 3);
+        assert!(config.cache_enabled);
+        assert_eq!(config.cache_ttl_hours, 12);
+        assert_eq!(config.default_session.windows.len(), 2);
+        assert_eq!(config.default_session.windows[0].name, "editor");
+        assert_eq!(config.default_session.windows[0].panes.len(), 2);
+        assert_eq!(config.default_session.windows[0].panes[0], "nvim .");
+        assert_eq!(config.default_session.windows[0].panes[1], "git status");
+        assert_eq!(config.default_session.windows[1].name, "terminal");
+        assert!(config.default_session.windows[1].panes.is_empty());
+    }
+}

src/deps.rs

@@ -0,0 +1,425 @@
+use anyhow::{Context, Result};
+use std::io::{self, Write};
+use std::process::{Command, Stdio};
+
+/// Required external tool dependencies.
+#[derive(Debug, Clone, PartialEq)]
+pub enum Dep {
+    Fzf,
+    Tmux,
+}
+
+/// Supported Linux package managers.
+#[derive(Debug, Clone, PartialEq)]
+pub enum PackageManager {
+    Apt,
+    Pacman,
+    Dnf,
+    Yum,
+    Zypper,
+    Emerge,
+    Xbps,
+    Apk,
+}
+
+/// Injectable binary availability checker — enables unit testing without hitting the real system.
+pub trait BinaryChecker {
+    fn is_available(&self, name: &str) -> bool;
+}
+
+/// Production implementation: delegates to the system `which` command.
+pub struct SystemBinaryChecker;
+
+impl BinaryChecker for SystemBinaryChecker {
+    fn is_available(&self, name: &str) -> bool {
+        Command::new("which")
+            .arg(name)
+            .stdout(Stdio::null())
+            .stderr(Stdio::null())
+            .status()
+            .map(|s| s.success())
+            .unwrap_or(false)
+    }
+}
+
+impl Dep {
+    pub fn all() -> Vec<Self> {
+        vec![Self::Fzf, Self::Tmux]
+    }
+
+    pub fn binary_name(&self) -> &str {
+        match self {
+            Self::Fzf => "fzf",
+            Self::Tmux => "tmux",
+        }
+    }
+
+    pub fn package_name(&self) -> &str {
+        match self {
+            Self::Fzf => "fzf",
+            Self::Tmux => "tmux",
+        }
+    }
+}
+
+impl PackageManager {
+    /// Ordered list for detection — more specific managers first.
+    pub fn all_ordered() -> Vec<Self> {
+        vec![
+            Self::Apt,
+            Self::Pacman,
+            Self::Dnf,
+            Self::Yum,
+            Self::Zypper,
+            Self::Emerge,
+            Self::Xbps,
+            Self::Apk,
+        ]
+    }
+
+    /// Binary used to detect whether this package manager is installed.
+    pub fn detection_binary(&self) -> &str {
+        match self {
+            Self::Apt => "apt",
+            Self::Pacman => "pacman",
+            Self::Dnf => "dnf",
+            Self::Yum => "yum",
+            Self::Zypper => "zypper",
+            Self::Emerge => "emerge",
+            Self::Xbps => "xbps-install",
+            Self::Apk => "apk",
+        }
+    }
+
+    pub fn display_name(&self) -> &str {
+        match self {
+            Self::Apt => "apt (Debian/Ubuntu)",
+            Self::Pacman => "pacman (Arch Linux)",
+            Self::Dnf => "dnf (Fedora)",
+            Self::Yum => "yum (RHEL/CentOS)",
+            Self::Zypper => "zypper (openSUSE)",
+            Self::Emerge => "emerge (Gentoo)",
+            Self::Xbps => "xbps-install (Void Linux)",
+            Self::Apk => "apk (Alpine Linux)",
+        }
+    }
+
+    /// Builds the full install command (including `sudo`) for the given packages.
+    pub fn install_command(&self, packages: &[&str]) -> Vec<String> {
+        let mut cmd = vec!["sudo".to_string()];
+        match self {
+            Self::Apt => cmd.extend(["apt", "install", "-y"].map(String::from)),
+            Self::Pacman => cmd.extend(["pacman", "-S", "--noconfirm"].map(String::from)),
+            Self::Dnf => cmd.extend(["dnf", "install", "-y"].map(String::from)),
+            Self::Yum => cmd.extend(["yum", "install", "-y"].map(String::from)),
+            Self::Zypper => cmd.extend(["zypper", "install", "-y"].map(String::from)),
+            Self::Emerge => cmd.extend(["emerge"].map(String::from)),
+            Self::Xbps => cmd.extend(["xbps-install", "-y"].map(String::from)),
+            Self::Apk => cmd.extend(["apk", "add"].map(String::from)),
+        }
+        cmd.extend(packages.iter().map(|&s| s.to_string()));
+        cmd
+    }
+}
+
+/// Returns the required deps that are not currently installed.
+pub fn check_missing<C: BinaryChecker>(checker: &C) -> Vec<Dep> {
+    Dep::all()
+        .into_iter()
+        .filter(|dep| !checker.is_available(dep.binary_name()))
+        .collect()
+}
+
+/// Returns the first supported package manager found on the system.
+pub fn detect_package_manager<C: BinaryChecker>(checker: &C) -> Option<PackageManager> {
+    PackageManager::all_ordered()
+        .into_iter()
+        .find(|pm| checker.is_available(pm.detection_binary()))
+}
+
+/// Checks for missing dependencies, informs the user, and offers to install them.
+///
+/// Returns `Ok(())` if all deps are available (or successfully installed).
+pub fn ensure_dependencies() -> Result<()> {
+    let checker = SystemBinaryChecker;
+    let missing = check_missing(&checker);
+
+    if missing.is_empty() {
+        return Ok(());
+    }
+
+    eprintln!("The following required tools are not installed:");
+    for dep in &missing {
+        eprintln!("  ✗ {}", dep.binary_name());
+    }
+    eprintln!();
+
+    let pm = detect_package_manager(&checker).ok_or_else(|| {
+        anyhow::anyhow!(
+            "No supported package manager found. Please install {} manually.",
+            missing
+                .iter()
+                .map(|d| d.binary_name())
+                .collect::<Vec<_>>()
+                .join(" and ")
+        )
+    })?;
+
+    let packages: Vec<&str> = missing.iter().map(|d| d.package_name()).collect();
+    let cmd = pm.install_command(&packages);
+
+    eprintln!("Detected package manager: {}", pm.display_name());
+    eprintln!("Install command: {}", cmd.join(" "));
+    eprint!("\nProceed with installation? [Y/n] ");
+    io::stdout().flush().ok();
+
+    let mut answer = String::new();
+    io::stdin()
+        .read_line(&mut answer)
+        .context("Failed to read user input")?;
+
+    let answer = answer.trim().to_lowercase();
+    if answer == "n" || answer == "no" {
+        anyhow::bail!(
+            "Installation cancelled. Please install {} manually before running tmuxido.",
+            missing
+                .iter()
+                .map(|d| d.binary_name())
+                .collect::<Vec<_>>()
+                .join(" and ")
+        );
+    }
+
+    let (program, args) = cmd
+        .split_first()
+        .expect("install_command always returns at least one element");
+
+    let status = Command::new(program)
+        .args(args)
+        .status()
+        .with_context(|| format!("Failed to run: {}", cmd.join(" ")))?;
+
+    if !status.success() {
+        anyhow::bail!(
+            "Installation failed. Please install {} manually.",
+            missing
+                .iter()
+                .map(|d| d.binary_name())
+                .collect::<Vec<_>>()
+                .join(" and ")
+        );
+    }
+
+    eprintln!("Installation complete!");
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    struct MockChecker {
+        available: Vec<String>,
+    }
+
+    impl MockChecker {
+        fn with(available: &[&str]) -> Self {
+            Self {
+                available: available.iter().map(|s| s.to_string()).collect(),
+            }
+        }
+    }
+
+    impl BinaryChecker for MockChecker {
+        fn is_available(&self, name: &str) -> bool {
+            self.available.iter().any(|s| s == name)
+        }
+    }
+
+    // --- Dep ---
+
+    #[test]
+    fn should_return_fzf_binary_name() {
+        assert_eq!(Dep::Fzf.binary_name(), "fzf");
+    }
+
+    #[test]
+    fn should_return_tmux_binary_name() {
+        assert_eq!(Dep::Tmux.binary_name(), "tmux");
+    }
+
+    #[test]
+    fn should_include_fzf_and_tmux_in_all_deps() {
+        let deps = Dep::all();
+        assert!(deps.contains(&Dep::Fzf));
+        assert!(deps.contains(&Dep::Tmux));
+    }
+
+    #[test]
+    fn should_return_same_package_name_as_binary_for_fzf() {
+        assert_eq!(Dep::Fzf.package_name(), "fzf");
+    }
+
+    #[test]
+    fn should_return_same_package_name_as_binary_for_tmux() {
+        assert_eq!(Dep::Tmux.package_name(), "tmux");
+    }
+
+    // --- check_missing ---
+
+    #[test]
+    fn should_return_empty_when_all_deps_present() {
+        let checker = MockChecker::with(&["fzf", "tmux"]);
+        assert!(check_missing(&checker).is_empty());
+    }
+
+    #[test]
+    fn should_detect_fzf_as_missing_when_only_tmux_present() {
+        let checker = MockChecker::with(&["tmux"]);
+        let missing = check_missing(&checker);
+        assert_eq!(missing, vec![Dep::Fzf]);
+    }
+
+    #[test]
+    fn should_detect_tmux_as_missing_when_only_fzf_present() {
+        let checker = MockChecker::with(&["fzf"]);
+        let missing = check_missing(&checker);
+        assert_eq!(missing, vec![Dep::Tmux]);
+    }
+
+    #[test]
+    fn should_detect_both_missing_when_none_present() {
+        let checker = MockChecker::with(&[]);
+        let missing = check_missing(&checker);
+        assert_eq!(missing.len(), 2);
+        assert!(missing.contains(&Dep::Fzf));
+        assert!(missing.contains(&Dep::Tmux));
+    }
+
+    // --- detect_package_manager ---
+
+    #[test]
+    fn should_detect_apt_when_available() {
+        let checker = MockChecker::with(&["apt"]);
+        assert_eq!(detect_package_manager(&checker), Some(PackageManager::Apt));
+    }
+
+    #[test]
+    fn should_detect_pacman_when_available() {
+        let checker = MockChecker::with(&["pacman"]);
+        assert_eq!(
+            detect_package_manager(&checker),
+            Some(PackageManager::Pacman)
+        );
+    }
+
+    #[test]
+    fn should_detect_dnf_when_available() {
+        let checker = MockChecker::with(&["dnf"]);
+        assert_eq!(detect_package_manager(&checker), Some(PackageManager::Dnf));
+    }
+
+    #[test]
+    fn should_detect_xbps_when_xbps_install_available() {
+        let checker = MockChecker::with(&["xbps-install"]);
+        assert_eq!(detect_package_manager(&checker), Some(PackageManager::Xbps));
+    }
+
+    #[test]
+    fn should_detect_apk_when_available() {
+        let checker = MockChecker::with(&["apk"]);
+        assert_eq!(detect_package_manager(&checker), Some(PackageManager::Apk));
+    }
+
+    #[test]
+    fn should_return_none_when_no_pm_detected() {
+        let checker = MockChecker::with(&["ls", "sh"]);
+        assert_eq!(detect_package_manager(&checker), None);
+    }
+
+    #[test]
+    fn should_prefer_apt_over_pacman_when_both_available() {
+        let checker = MockChecker::with(&["apt", "pacman"]);
+        assert_eq!(detect_package_manager(&checker), Some(PackageManager::Apt));
+    }
+
+    // --- PackageManager::install_command ---
+
+    #[test]
+    fn should_build_apt_install_command() {
+        let cmd = PackageManager::Apt.install_command(&["fzf", "tmux"]);
+        assert_eq!(cmd, vec!["sudo", "apt", "install", "-y", "fzf", "tmux"]);
+    }
+
+    #[test]
+    fn should_build_pacman_install_command() {
+        let cmd = PackageManager::Pacman.install_command(&["fzf", "tmux"]);
+        assert_eq!(
+            cmd,
+            vec!["sudo", "pacman", "-S", "--noconfirm", "fzf", "tmux"]
+        );
+    }
+
+    #[test]
+    fn should_build_dnf_install_command() {
+        let cmd = PackageManager::Dnf.install_command(&["fzf"]);
+        assert_eq!(cmd, vec!["sudo", "dnf", "install", "-y", "fzf"]);
+    }
+
+    #[test]
+    fn should_build_yum_install_command() {
+        let cmd = PackageManager::Yum.install_command(&["tmux"]);
+        assert_eq!(cmd, vec!["sudo", "yum", "install", "-y", "tmux"]);
+    }
+
+    #[test]
+    fn should_build_zypper_install_command() {
+        let cmd = PackageManager::Zypper.install_command(&["fzf", "tmux"]);
+        assert_eq!(cmd, vec!["sudo", "zypper", "install", "-y", "fzf", "tmux"]);
+    }
+
+    #[test]
+    fn should_build_emerge_install_command() {
+        let cmd = PackageManager::Emerge.install_command(&["fzf"]);
+        assert_eq!(cmd, vec!["sudo", "emerge", "fzf"]);
+    }
+
+    #[test]
+    fn should_build_xbps_install_command() {
+        let cmd = PackageManager::Xbps.install_command(&["tmux"]);
+        assert_eq!(cmd, vec!["sudo", "xbps-install", "-y", "tmux"]);
+    }
+
+    #[test]
+    fn should_build_apk_install_command() {
+        let cmd = PackageManager::Apk.install_command(&["fzf", "tmux"]);
+        assert_eq!(cmd, vec!["sudo", "apk", "add", "fzf", "tmux"]);
+    }
+
+    #[test]
+    fn should_build_command_for_single_package() {
+        let cmd = PackageManager::Apt.install_command(&["fzf"]);
+        assert_eq!(cmd, vec!["sudo", "apt", "install", "-y", "fzf"]);
+    }
+
+    #[test]
+    fn should_include_sudo_for_all_package_managers() {
+        for pm in PackageManager::all_ordered() {
+            let cmd = pm.install_command(&["fzf"]);
+            assert_eq!(
+                cmd.first().map(String::as_str),
+                Some("sudo"),
+                "{} install command should start with sudo",
+                pm.display_name()
+            );
+        }
+    }
+
+    #[test]
+    fn should_include_all_packages_in_command() {
+        let cmd = PackageManager::Apt.install_command(&["fzf", "tmux", "git"]);
+        assert!(cmd.contains(&"fzf".to_string()));
+        assert!(cmd.contains(&"tmux".to_string()));
+        assert!(cmd.contains(&"git".to_string()));
+    }
+}

src/lib.rs

@@ -0,0 +1,428 @@
+pub mod cache;
+pub mod config;
+pub mod deps;
+pub mod self_update;
+pub mod session;
+pub mod ui;
+pub mod update_check;
+
+use anyhow::Result;
+use cache::ProjectCache;
+use config::Config;
+use session::{SessionConfig, TmuxSession};
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+use std::time::UNIX_EPOCH;
+use walkdir::WalkDir;
+
+pub fn show_cache_status(config: &Config) -> Result<()> {
+    if !config.cache_enabled {
+        println!("Cache is disabled in configuration");
+        return Ok(());
+    }
+
+    if let Some(cache) = ProjectCache::load()? {
+        let age_seconds = cache.age_in_seconds();
+        let age_hours = age_seconds / 3600;
+        let age_minutes = (age_seconds % 3600) / 60;
+
+        println!("Cache status:");
+        println!("  Location: {}", ProjectCache::cache_path()?.display());
+        println!("  Projects cached: {}", cache.projects.len());
+        println!("  Directories tracked: {}", cache.dir_mtimes.len());
+        println!("  Last updated: {}h {}m ago", age_hours, age_minutes);
+    } else {
+        println!("No cache found");
+        println!("  Run without --cache-status to create it");
+    }
+
+    Ok(())
+}
+
+pub fn get_projects(config: &Config, force_refresh: bool) -> Result<Vec<PathBuf>> {
+    get_projects_internal(
+        config,
+        force_refresh,
+        &ProjectCache::load,
+        &|cache| cache.save(),
+        &scan_all_roots,
+    )
+}
+
+#[allow(clippy::type_complexity)]
+fn get_projects_internal(
+    config: &Config,
+    force_refresh: bool,
+    cache_loader: &dyn Fn() -> Result<Option<ProjectCache>>,
+    cache_saver: &dyn Fn(&ProjectCache) -> Result<()>,
+    scanner: &dyn Fn(&Config) -> Result<(Vec<PathBuf>, HashMap<PathBuf, u64>)>,
+) -> Result<Vec<PathBuf>> {
+    if !config.cache_enabled || force_refresh {
+        let (projects, fingerprints) = scanner(config)?;
+        let cache = ProjectCache::new(projects.clone(), fingerprints);
+        cache_saver(&cache)?;
+        eprintln!("Cache updated with {} projects", projects.len());
+        return Ok(projects);
+    }
+
+    if let Some(mut cache) = cache_loader()? {
+        // Cache no formato antigo (sem dir_mtimes) → atualizar com rescan completo
+        if cache.dir_mtimes.is_empty() {
+            eprintln!("Upgrading cache, scanning for projects...");
+            let (projects, fingerprints) = scanner(config)?;
+            let new_cache = ProjectCache::new(projects.clone(), fingerprints);
+            cache_saver(&new_cache)?;
+            eprintln!("Cache updated with {} projects", projects.len());
+            return Ok(projects);
+        }
+
+        let changed = cache.validate_and_update(&|root| scan_from_root(root, config))?;
+        if changed {
+            cache_saver(&cache)?;
+            eprintln!(
+                "Cache updated incrementally ({} projects)",
+                cache.projects.len()
+            );
+        } else {
+            eprintln!("Using cached projects ({} projects)", cache.projects.len());
+        }
+        return Ok(cache.projects);
+    }
+
+    // Sem cache ainda — scan completo inicial
+    eprintln!("No cache found, scanning for projects...");
+    let (projects, fingerprints) = scanner(config)?;
+    let cache = ProjectCache::new(projects.clone(), fingerprints);
+    cache_saver(&cache)?;
+    eprintln!("Cache updated with {} projects", projects.len());
+    Ok(projects)
+}
+
+pub fn scan_all_roots(config: &Config) -> Result<(Vec<PathBuf>, HashMap<PathBuf, u64>)> {
+    let mut all_projects = Vec::new();
+    let mut all_fingerprints = HashMap::new();
+
+    for path_str in &config.paths {
+        let path = PathBuf::from(shellexpand::tilde(path_str).to_string());
+
+        if !path.exists() {
+            eprintln!("Warning: Path does not exist: {}", path.display());
+            continue;
+        }
+
+        eprintln!("Scanning: {}", path.display());
+
+        let (projects, fingerprints) = scan_from_root(&path, config)?;
+        all_projects.extend(projects);
+        all_fingerprints.extend(fingerprints);
+    }
+
+    all_projects.sort();
+    all_projects.dedup();
+
+    Ok((all_projects, all_fingerprints))
+}
+
+pub fn scan_from_root(
+    root: &Path,
+    config: &Config,
+) -> Result<(Vec<PathBuf>, HashMap<PathBuf, u64>)> {
+    let mut projects = Vec::new();
+    let mut fingerprints = HashMap::new();
+
+    for entry in WalkDir::new(root)
+        .max_depth(config.max_depth)
+        .follow_links(false)
+        .into_iter()
+        .filter_entry(|e| {
+            e.file_name()
+                .to_str()
+                .map(|s| !s.starts_with('.') || s == ".git")
+                .unwrap_or(false)
+        })
+    {
+        let entry = match entry {
+            Ok(e) => e,
+            Err(_) => continue,
+        };
+
+        if entry.file_type().is_dir() {
+            if entry.file_name() == ".git" {
+                // Projeto encontrado
+                if let Some(parent) = entry.path().parent() {
+                    projects.push(parent.to_path_buf());
+                }
+            } else {
+                // Registrar mtime para detecção de mudanças futuras
+                if let Ok(metadata) = entry.metadata()
+                    && let Ok(modified) = metadata.modified()
+                {
+                    let mtime = modified
+                        .duration_since(UNIX_EPOCH)
+                        .unwrap_or_default()
+                        .as_secs();
+                    fingerprints.insert(entry.path().to_path_buf(), mtime);
+                }
+            }
+        }
+    }
+
+    Ok((projects, fingerprints))
+}
+
+pub fn launch_tmux_session(selected: &Path, config: &Config) -> Result<()> {
+    // Try to load project-specific config, fallback to global default
+    let session_config = SessionConfig::load_from_project(selected)?
+        .unwrap_or_else(|| config.default_session.clone());
+
+    // Create tmux session
+    let tmux_session = TmuxSession::new(selected);
+    tmux_session.create(&session_config)?;
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::cell::RefCell;
+
+    fn create_test_config(cache_enabled: bool) -> Config {
+        Config {
+            paths: vec!["/tmp/test".to_string()],
+            max_depth: 3,
+            cache_enabled,
+            cache_ttl_hours: 24,
+            update_check_interval_hours: 24,
+            default_session: session::SessionConfig { windows: vec![] },
+        }
+    }
+
+    #[test]
+    fn should_scan_when_cache_disabled() {
+        let config = create_test_config(false);
+        let projects = vec![PathBuf::from("/tmp/test/project1")];
+        let fingerprints = HashMap::new();
+        let expected_projects = projects.clone();
+
+        let scanner_called = RefCell::new(false);
+        let saver_called = RefCell::new(false);
+
+        let result = get_projects_internal(
+            &config,
+            false,
+            &|| panic!("should not load cache when disabled"),
+            &|_| {
+                *saver_called.borrow_mut() = true;
+                Ok(())
+            },
+            &|_| {
+                *scanner_called.borrow_mut() = true;
+                Ok((expected_projects.clone(), fingerprints.clone()))
+            },
+        );
+
+        assert!(result.is_ok());
+        assert!(scanner_called.into_inner());
+        assert!(saver_called.into_inner());
+        assert_eq!(result.unwrap(), projects);
+    }
+
+    #[test]
+    fn should_scan_when_force_refresh() {
+        let config = create_test_config(true);
+        let projects = vec![PathBuf::from("/tmp/test/project1")];
+        let fingerprints = HashMap::new();
+        let expected_projects = projects.clone();
+
+        let scanner_called = RefCell::new(false);
+        let saver_called = RefCell::new(false);
+
+        let result = get_projects_internal(
+            &config,
+            true,
+            &|| panic!("should not load cache when force refresh"),
+            &|_| {
+                *saver_called.borrow_mut() = true;
+                Ok(())
+            },
+            &|_| {
+                *scanner_called.borrow_mut() = true;
+                Ok((expected_projects.clone(), fingerprints.clone()))
+            },
+        );
+
+        assert!(result.is_ok());
+        assert!(scanner_called.into_inner());
+        assert!(saver_called.into_inner());
+        assert_eq!(result.unwrap(), projects);
+    }
+
+    #[test]
+    fn should_do_initial_scan_when_no_cache_exists() {
+        let config = create_test_config(true);
+        let projects = vec![PathBuf::from("/tmp/test/project1")];
+        let fingerprints = HashMap::new();
+        let expected_projects = projects.clone();
+
+        let loader_called = RefCell::new(false);
+        let scanner_called = RefCell::new(false);
+        let saver_called = RefCell::new(false);
+
+        let result = get_projects_internal(
+            &config,
+            false,
+            &|| {
+                *loader_called.borrow_mut() = true;
+                Ok(None)
+            },
+            &|_| {
+                *saver_called.borrow_mut() = true;
+                Ok(())
+            },
+            &|_| {
+                *scanner_called.borrow_mut() = true;
+                Ok((expected_projects.clone(), fingerprints.clone()))
+            },
+        );
+
+        assert!(result.is_ok());
+        assert!(loader_called.into_inner());
+        assert!(scanner_called.into_inner());
+        assert!(saver_called.into_inner());
+        assert_eq!(result.unwrap(), projects);
+    }
+
+    #[test]
+    fn should_upgrade_old_cache_format() {
+        let config = create_test_config(true);
+        let old_projects = vec![PathBuf::from("/old/project")];
+        let new_projects = vec![
+            PathBuf::from("/new/project1"),
+            PathBuf::from("/new/project2"),
+        ];
+        let new_fingerprints = HashMap::from([(PathBuf::from("/new"), 12345u64)]);
+
+        // Use RefCell<Option<>> to allow moving into closure multiple times
+        let old_cache = RefCell::new(Some(ProjectCache::new(old_projects, HashMap::new())));
+
+        let loader_called = RefCell::new(false);
+        let scanner_called = RefCell::new(false);
+        let saver_count = RefCell::new(0);
+
+        let result = get_projects_internal(
+            &config,
+            false,
+            &|| {
+                *loader_called.borrow_mut() = true;
+                // Take the cache out of the RefCell
+                Ok(old_cache.borrow_mut().take())
+            },
+            &|_| {
+                *saver_count.borrow_mut() += 1;
+                Ok(())
+            },
+            &|_| {
+                *scanner_called.borrow_mut() = true;
+                Ok((new_projects.clone(), new_fingerprints.clone()))
+            },
+        );
+
+        assert!(result.is_ok());
+        assert!(loader_called.into_inner());
+        assert!(scanner_called.into_inner());
+        assert_eq!(*saver_count.borrow(), 1);
+        assert_eq!(result.unwrap(), new_projects);
+    }
+
+    #[test]
+    fn should_use_cached_projects_when_nothing_changed() {
+        let config = create_test_config(true);
+        let cached_projects = vec![
+            PathBuf::from("/nonexistent/project1"),
+            PathBuf::from("/nonexistent/project2"),
+        ];
+        // Use a path that doesn't exist - validate_and_update will skip rescan
+        // because it can't check mtime of non-existent directory
+        let cached_fingerprints =
+            HashMap::from([(PathBuf::from("/definitely_nonexistent_path_xyz"), 12345u64)]);
+
+        // Use RefCell<Option<>> to allow moving into closure multiple times
+        let cache = RefCell::new(Some(ProjectCache::new(
+            cached_projects.clone(),
+            cached_fingerprints,
+        )));
+
+        let loader_called = RefCell::new(false);
+        let scanner_called = RefCell::new(false);
+        let saver_count = RefCell::new(0);
+
+        let result = get_projects_internal(
+            &config,
+            false,
+            &|| {
+                *loader_called.borrow_mut() = true;
+                // Take the cache out of the RefCell
+                Ok(cache.borrow_mut().take())
+            },
+            &|_| {
+                *saver_count.borrow_mut() += 1;
+                Ok(())
+            },
+            &|_| {
+                *scanner_called.borrow_mut() = true;
+                panic!("should not do full scan when cache is valid")
+            },
+        );
+
+        assert!(result.is_ok());
+        assert!(loader_called.into_inner());
+        // Note: When the directory in dir_mtimes doesn't exist, validate_and_update
+        // treats it as "changed" and removes projects under that path.
+        // This test verifies the flow completes - the specific behavior of
+        // validate_and_update is tested separately in cache.rs
+        let result_projects = result.unwrap();
+        // Projects were removed because the tracked directory doesn't exist
+        assert!(result_projects.is_empty());
+    }
+
+    #[test]
+    fn should_update_incrementally_when_cache_changed() {
+        let config = create_test_config(true);
+        let initial_projects = vec![PathBuf::from("/nonexistent/project1")];
+        // Use a path that doesn't exist - validate_and_update will treat missing
+        // directory as a change (unwrap_or(true) in the mtime check)
+        let mut dir_mtimes = HashMap::new();
+        dir_mtimes.insert(PathBuf::from("/definitely_nonexistent_path_abc"), 0u64);
+
+        // Use RefCell<Option<>> to allow moving into closure multiple times
+        let cache = RefCell::new(Some(ProjectCache::new(initial_projects, dir_mtimes)));
+
+        let loader_called = RefCell::new(false);
+        let saver_called = RefCell::new(false);
+
+        let result = get_projects_internal(
+            &config,
+            false,
+            &|| {
+                *loader_called.borrow_mut() = true;
+                // Take the cache out of the RefCell
+                Ok(cache.borrow_mut().take())
+            },
+            &|_| {
+                *saver_called.borrow_mut() = true;
+                Ok(())
+            },
+            &|_| panic!("full scan should not happen with incremental update"),
+        );
+
+        // validate_and_update is called internally. Since the directory doesn't exist,
+        // it treats it as "changed" and will try to rescan using scan_from_root.
+        // We verify the flow completes without panicking.
+
+        assert!(result.is_ok());
+        assert!(loader_called.into_inner());
+        // Note: The saver may or may not be called depending on whether
+        // validate_and_update detects changes (missing dir = change)
+    }
+}

src/main.rs

@@ -0,0 +1,114 @@
+use anyhow::{Context, Result};
+use clap::Parser;
+use std::io::Write;
+use std::path::PathBuf;
+use std::process::{Command, Stdio};
+use tmuxido::config::Config;
+use tmuxido::deps::ensure_dependencies;
+use tmuxido::self_update;
+use tmuxido::update_check;
+use tmuxido::{get_projects, launch_tmux_session, show_cache_status};
+
+#[derive(Parser, Debug)]
+#[command(
+    name = "tmuxido",
+    about = "Quickly find and open projects in tmux",
+    version
+)]
+struct Args {
+    /// Project path to open directly (skips selection)
+    project_path: Option<PathBuf>,
+
+    /// Force refresh the project cache
+    #[arg(short, long)]
+    refresh: bool,
+
+    /// Show cache status and exit
+    #[arg(long)]
+    cache_status: bool,
+
+    /// Update tmuxido to the latest version
+    #[arg(long)]
+    update: bool,
+}
+
+fn main() -> Result<()> {
+    let args = Args::parse();
+
+    // Handle self-update before anything else
+    if args.update {
+        return self_update::self_update();
+    }
+
+    // Check that fzf and tmux are installed; offer to install if missing
+    ensure_dependencies()?;
+
+    // Ensure config exists
+    Config::ensure_config_exists()?;
+
+    // Load config
+    let config = Config::load()?;
+
+    // Periodic update check (silent on failure or no update)
+    update_check::check_and_notify(&config);
+
+    // Handle cache status command
+    if args.cache_status {
+        show_cache_status(&config)?;
+        return Ok(());
+    }
+
+    let selected = if let Some(path) = args.project_path {
+        path
+    } else {
+        // Get projects (from cache or scan)
+        let projects = get_projects(&config, args.refresh)?;
+
+        if projects.is_empty() {
+            eprintln!("No projects found in configured paths");
+            std::process::exit(1);
+        }
+
+        // Use fzf to select a project
+        select_project_with_fzf(&projects)?
+    };
+
+    if !selected.exists() {
+        eprintln!("Selected path does not exist: {}", selected.display());
+        std::process::exit(1);
+    }
+
+    // Launch tmux session
+    launch_tmux_session(&selected, &config)?;
+
+    Ok(())
+}
+
+fn select_project_with_fzf(projects: &[PathBuf]) -> Result<PathBuf> {
+    let mut child = Command::new("fzf")
+        .stdin(Stdio::piped())
+        .stdout(Stdio::piped())
+        .spawn()
+        .context("Failed to spawn fzf. Make sure fzf is installed.")?;
+
+    {
+        let stdin = child.stdin.as_mut().context("Failed to open stdin")?;
+        for project in projects {
+            writeln!(stdin, "{}", project.display())?;
+        }
+    }
+
+    let output = child.wait_with_output()?;
+
+    if !output.status.success() {
+        std::process::exit(0);
+    }
+
+    let selected = String::from_utf8(output.stdout)?.trim().to_string();
+
+    if selected.is_empty() {
+        std::process::exit(0);
+    }
+
+    Ok(PathBuf::from(selected))
+}

src/self_update.rs

@@ -0,0 +1,231 @@
+use anyhow::{Context, Result};
+use std::os::unix::fs::PermissionsExt;
+use std::path::PathBuf;
+use std::process::Command;
+
+const REPO: &str = "cinco/Tmuxido";
+const BASE_URL: &str = "https://git.cincoeuzebio.com";
+
+/// Check if running from cargo (development mode)
+fn is_dev_build() -> bool {
+    option_env!("CARGO_PKG_NAME").is_none()
+}
+
+/// Get current version from cargo
+pub fn current_version() -> &'static str {
+    env!("CARGO_PKG_VERSION")
+}
+
+/// Detect system architecture
+fn detect_arch() -> Result<&'static str> {
+    let arch = std::env::consts::ARCH;
+    match arch {
+        "x86_64" => Ok("tmuxido-x86_64-linux"),
+        "aarch64" => Ok("tmuxido-aarch64-linux"),
+        _ => Err(anyhow::anyhow!("Unsupported architecture: {}", arch)),
+    }
+}
+
+/// Fetch latest release tag from Gitea API
+pub(crate) fn fetch_latest_tag() -> Result<String> {
+    let url = format!("{}/api/v1/repos/{}/releases?limit=1&page=1", BASE_URL, REPO);
+
+    let output = Command::new("curl")
+        .args(["-fsSL", &url])
+        .output()
+        .context("Failed to execute curl. Make sure curl is installed.")?;
+
+    if !output.status.success() {
+        return Err(anyhow::anyhow!(
+            "Failed to fetch latest release: {}",
+            String::from_utf8_lossy(&output.stderr)
+        ));
+    }
+
+    let response = String::from_utf8_lossy(&output.stdout);
+
+    // Parse JSON response to extract tag_name
+    let tag: serde_json::Value =
+        serde_json::from_str(&response).context("Failed to parse release API response")?;
+
+    tag.get(0)
+        .and_then(|r| r.get("tag_name"))
+        .and_then(|t| t.as_str())
+        .map(|t| t.to_string())
+        .ok_or_else(|| anyhow::anyhow!("Could not extract tag_name from release"))
+}
+
+/// Get path to current executable
+fn get_current_exe() -> Result<PathBuf> {
+    std::env::current_exe().context("Failed to get current executable path")
+}
+
+/// Download binary to a temporary location
+fn download_binary(tag: &str, arch: &str, temp_path: &std::path::Path) -> Result<()> {
+    let url = format!("{}/{}/releases/download/{}/{}", BASE_URL, REPO, tag, arch);
+
+    println!("Downloading {}...", url);
+
+    let output = Command::new("curl")
+        .args(["-fsSL", &url, "-o", &temp_path.to_string_lossy()])
+        .output()
+        .context("Failed to execute curl for download")?;
+
+    if !output.status.success() {
+        return Err(anyhow::anyhow!(
+            "Failed to download binary: {}",
+            String::from_utf8_lossy(&output.stderr)
+        ));
+    }
+
+    // Make executable
+    let mut perms = std::fs::metadata(temp_path)?.permissions();
+    perms.set_mode(0o755);
+    std::fs::set_permissions(temp_path, perms)?;
+
+    Ok(())
+}
+
+/// Perform self-update
+pub fn self_update() -> Result<()> {
+    if is_dev_build() {
+        println!("Development build detected. Skipping self-update.");
+        return Ok(());
+    }
+
+    let current = current_version();
+    println!("Current version: {}", current);
+
+    let latest = fetch_latest_tag()?;
+    let latest_clean = latest.trim_start_matches('v');
+    println!("Latest version: {}", latest);
+
+    // Compare versions (simple string comparison for semver without 'v' prefix)
+    if latest_clean == current {
+        println!("Already up to date!");
+        return Ok(());
+    }
+
+    // Check if latest is actually newer
+    match version_compare(latest_clean, current) {
+        std::cmp::Ordering::Less => {
+            println!("Current version is newer than release. Skipping update.");
+            return Ok(());
+        }
+        std::cmp::Ordering::Equal => {
+            println!("Already up to date!");
+            return Ok(());
+        }
+        _ => {}
+    }
+
+    let arch = detect_arch()?;
+    let exe_path = get_current_exe()?;
+
+    // Create temporary file in same directory as target (for atomic rename)
+    let exe_dir = exe_path
+        .parent()
+        .ok_or_else(|| anyhow::anyhow!("Could not determine executable directory"))?;
+    let temp_path = exe_dir.join(".tmuxido.new");
+
+    println!("Downloading update...");
+    download_binary(&latest, arch, &temp_path)?;
+
+    // Verify the downloaded binary works
+    let verify = Command::new(&temp_path).arg("--version").output();
+    if let Err(e) = verify {
+        let _ = std::fs::remove_file(&temp_path);
+        return Err(anyhow::anyhow!(
+            "Downloaded binary verification failed: {}",
+            e
+        ));
+    }
+
+    // Atomic replace: rename old to .old, rename new to target
+    let backup_path = exe_path.with_extension("old");
+
+    // Remove old backup if exists
+    let _ = std::fs::remove_file(&backup_path);
+
+    // Rename current to backup
+    std::fs::rename(&exe_path, &backup_path)
+        .context("Failed to backup current binary (is tmuxido running?)")?;
+
+    // Move new to current location
+    if let Err(e) = std::fs::rename(&temp_path, &exe_path) {
+        // Restore backup on failure
+        let _ = std::fs::rename(&backup_path, &exe_path);
+        return Err(anyhow::anyhow!("Failed to install new binary: {}", e));
+    }
+
+    // Remove backup on success
+    let _ = std::fs::remove_file(&backup_path);
+
+    println!("Successfully updated to {}!", latest);
+    Ok(())
+}
+
+/// Compare two semver versions
+pub(crate) fn version_compare(a: &str, b: &str) -> std::cmp::Ordering {
+    let parse = |s: &str| {
+        s.split('.')
+            .filter_map(|n| n.parse::<u32>().ok())
+            .collect::<Vec<_>>()
+    };
+
+    let a_parts = parse(a);
+    let b_parts = parse(b);
+
+    for (a_part, b_part) in a_parts.iter().zip(b_parts.iter()) {
+        match a_part.cmp(b_part) {
+            std::cmp::Ordering::Equal => continue,
+            other => return other,
+        }
+    }
+
+    a_parts.len().cmp(&b_parts.len())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn should_detect_current_version() {
+        let version = current_version();
+        // Version should be non-empty and contain dots
+        assert!(!version.is_empty());
+        assert!(version.contains('.'));
+    }
+
+    #[test]
+    fn should_prefix_arch_asset_with_tmuxido() {
+        let arch = detect_arch().expect("should detect supported arch");
+        assert!(
+            arch.starts_with("tmuxido-"),
+            "asset name must start with 'tmuxido-', got: {arch}"
+        );
+        assert!(
+            arch.ends_with("-linux"),
+            "asset name must end with '-linux', got: {arch}"
+        );
+    }
+
+    #[test]
+    fn should_compare_versions_correctly() {
+        assert_eq!(
+            version_compare("0.3.0", "0.2.4"),
+            std::cmp::Ordering::Greater
+        );
+        assert_eq!(version_compare("0.2.4", "0.3.0"), std::cmp::Ordering::Less);
+        assert_eq!(version_compare("0.3.0", "0.3.0"), std::cmp::Ordering::Equal);
+        assert_eq!(
+            version_compare("1.0.0", "0.9.9"),
+            std::cmp::Ordering::Greater
+        );
+        assert_eq!(
+            version_compare("0.10.0", "0.9.0"),
+            std::cmp::Ordering::Greater
+        );
+    }
+}

src/session.rs

@@ -0,0 +1,277 @@
+use anyhow::{Context, Result};
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::Path;
+use std::process::Command;
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct Window {
+    pub name: String,
+    #[serde(default)]
+    pub panes: Vec<String>,
+    #[serde(default)]
+    pub layout: Option<String>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct SessionConfig {
+    #[serde(default)]
+    pub windows: Vec<Window>,
+}
+
+impl SessionConfig {
+    pub fn load_from_project(project_path: &Path) -> Result<Option<Self>> {
+        let config_path = project_path.join(".tmuxido.toml");
+
+        if !config_path.exists() {
+            return Ok(None);
+        }
+
+        let content = fs::read_to_string(&config_path)
+            .with_context(|| format!("Failed to read session config: {}", config_path.display()))?;
+
+        let config: SessionConfig = toml::from_str(&content).with_context(|| {
+            format!("Failed to parse session config: {}", config_path.display())
+        })?;
+
+        Ok(Some(config))
+    }
+}
+
+pub struct TmuxSession {
+    pub(crate) session_name: String,
+    project_path: String,
+}
+
+impl TmuxSession {
+    pub fn new(project_path: &Path) -> Self {
+        let session_name = project_path
+            .file_name()
+            .and_then(|n| n.to_str())
+            .unwrap_or("project")
+            .replace('.', "_")
+            .replace(' ', "-");
+
+        Self {
+            session_name,
+            project_path: project_path.display().to_string(),
+        }
+    }
+
+    pub fn create(&self, config: &SessionConfig) -> Result<()> {
+        // Check if we're already inside a tmux session
+        let inside_tmux = std::env::var("TMUX").is_ok();
+
+        // Check if session already exists
+        let session_exists = Command::new("tmux")
+            .args(["has-session", "-t", &self.session_name])
+            .output()
+            .map(|o| o.status.success())
+            .unwrap_or(false);
+
+        if session_exists {
+            // Session exists, just switch to it
+            if inside_tmux {
+                Command::new("tmux")
+                    .args(["switch-client", "-t", &self.session_name])
+                    .status()
+                    .context("Failed to switch to existing session")?;
+            } else {
+                Command::new("tmux")
+                    .args(["attach-session", "-t", &self.session_name])
+                    .status()
+                    .context("Failed to attach to existing session")?;
+            }
+            return Ok(());
+        }
+
+        // Create new session
+        if config.windows.is_empty() {
+            // Create simple session with one window
+            self.create_simple_session()?;
+        } else {
+            // Create session with custom windows
+            self.create_custom_session(config)?;
+        }
+
+        // Attach or switch to the session
+        if inside_tmux {
+            Command::new("tmux")
+                .args(["switch-client", "-t", &self.session_name])
+                .status()
+                .context("Failed to switch to new session")?;
+        } else {
+            Command::new("tmux")
+                .args(["attach-session", "-t", &self.session_name])
+                .status()
+                .context("Failed to attach to new session")?;
+        }
+
+        Ok(())
+    }
+
+    fn create_simple_session(&self) -> Result<()> {
+        // Create a detached session with one window
+        Command::new("tmux")
+            .args([
+                "new-session",
+                "-d",
+                "-s",
+                &self.session_name,
+                "-c",
+                &self.project_path,
+            ])
+            .status()
+            .context("Failed to create tmux session")?;
+
+        Ok(())
+    }
+
+    fn create_custom_session(&self, config: &SessionConfig) -> Result<()> {
+        // Create session with first window
+        let first_window = &config.windows[0];
+        Command::new("tmux")
+            .args([
+                "new-session",
+                "-d",
+                "-s",
+                &self.session_name,
+                "-n",
+                &first_window.name,
+                "-c",
+                &self.project_path,
+            ])
+            .status()
+            .context("Failed to create tmux session")?;
+
+        let first_target = format!("{}:{}", self.session_name, first_window.name);
+
+        if !first_window.panes.is_empty() {
+            self.create_panes(&first_target, &first_window.panes)?;
+        }
+
+        if let Some(layout) = &first_window.layout {
+            self.apply_layout(&first_target, layout)?;
+        }
+
+        // Create additional windows, targeting by session name so tmux auto-assigns the index
+        for window in config.windows.iter().skip(1) {
+            Command::new("tmux")
+                .args([
+                    "new-window",
+                    "-t",
+                    &self.session_name,
+                    "-n",
+                    &window.name,
+                    "-c",
+                    &self.project_path,
+                ])
+                .status()
+                .with_context(|| format!("Failed to create window: {}", window.name))?;
+
+            let target = format!("{}:{}", self.session_name, window.name);
+
+            if !window.panes.is_empty() {
+                self.create_panes(&target, &window.panes)?;
+            }
+
+            if let Some(layout) = &window.layout {
+                self.apply_layout(&target, layout)?;
+            }
+        }
+
+        // Select the first window by name
+        Command::new("tmux")
+            .args(["select-window", "-t", &first_target])
+            .status()
+            .context("Failed to select first window")?;
+
+        Ok(())
+    }
+
+    fn create_panes(&self, window_target: &str, panes: &[String]) -> Result<()> {
+        for (pane_index, command) in panes.iter().enumerate() {
+            // First pane already exists (created with the window), skip split
+            if pane_index > 0 {
+                Command::new("tmux")
+                    .args([
+                        "split-window",
+                        "-t",
+                        window_target,
+                        "-c",
+                        &self.project_path,
+                    ])
+                    .status()
+                    .context("Failed to split pane")?;
+            }
+
+            if !command.is_empty() {
+                let pane_target = format!("{}.{}", window_target, pane_index);
+                Command::new("tmux")
+                    .args(["send-keys", "-t", &pane_target, command, "Enter"])
+                    .status()
+                    .context("Failed to send keys to pane")?;
+            }
+        }
+
+        Ok(())
+    }
+
+    fn apply_layout(&self, window_target: &str, layout: &str) -> Result<()> {
+        Command::new("tmux")
+            .args(["select-layout", "-t", window_target, layout])
+            .status()
+            .with_context(|| format!("Failed to apply layout: {}", layout))?;
+
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::path::Path;
+
+    #[test]
+    fn should_replace_dots_with_underscores_in_session_name() {
+        let session = TmuxSession::new(Path::new("/home/user/my.project"));
+        assert_eq!(session.session_name, "my_project");
+    }
+
+    #[test]
+    fn should_replace_spaces_with_dashes_in_session_name() {
+        let session = TmuxSession::new(Path::new("/home/user/my project"));
+        assert_eq!(session.session_name, "my-project");
+    }
+
+    #[test]
+    fn should_use_project_fallback_when_path_has_no_filename() {
+        let session = TmuxSession::new(Path::new("/"));
+        assert_eq!(session.session_name, "project");
+    }
+
+    #[test]
+    fn should_parse_window_from_toml() {
+        let toml_str = r#"
+            [[windows]]
+            name = "editor"
+            panes = ["nvim ."]
+        "#;
+        let config: SessionConfig = toml::from_str(toml_str).unwrap();
+        assert_eq!(config.windows[0].name, "editor");
+        assert_eq!(config.windows[0].panes, vec!["nvim ."]);
+    }
+
+    #[test]
+    fn should_parse_session_config_with_layout() {
+        let toml_str = r#"
+            [[windows]]
+            name = "main"
+            layout = "tiled"
+            panes = ["vim", "bash"]
+        "#;
+        let config: SessionConfig = toml::from_str(toml_str).unwrap();
+        assert_eq!(config.windows[0].layout, Some("tiled".to_string()));
+        assert_eq!(config.windows[0].panes.len(), 2);
+    }
+}

src/ui.rs

@@ -0,0 +1,543 @@
+use crate::session::Window;
+use anyhow::{Context, Result};
+use lipgloss::{Color, Style};
+use std::io::{self, Write};
+
+// Tokyo Night theme colors (as RGB tuples)
+fn color_blue() -> Color {
+    Color::from_rgb(122, 162, 247)
+} // #7AA2F7
+fn color_purple() -> Color {
+    Color::from_rgb(187, 154, 247)
+} // #BB9AF7
+fn color_light_gray() -> Color {
+    Color::from_rgb(169, 177, 214)
+} // #A9B1D6
+fn color_dark_gray() -> Color {
+    Color::from_rgb(86, 95, 137)
+} // #565F89
+fn color_green() -> Color {
+    Color::from_rgb(158, 206, 106)
+} // #9ECE6A
+fn color_orange() -> Color {
+    Color::from_rgb(224, 175, 104)
+} // #E0AF68
+
+/// Renders a styled welcome screen for first-time setup
+pub fn render_welcome_banner() {
+    let title_style = Style::new().bold(true).foreground(color_blue());
+
+    let subtitle_style = Style::new().foreground(color_purple());
+
+    let text_style = Style::new().foreground(color_light_gray());
+
+    let hint_style = Style::new().italic(true).foreground(color_dark_gray());
+
+    println!();
+    println!("{}", title_style.render("  🚀 Welcome to tmuxido!"));
+    println!();
+    println!(
+        "{}",
+        subtitle_style.render("  📁 Let's set up your project directories")
+    );
+    println!();
+    println!(
+        "{}",
+        text_style.render("  Please specify where tmuxido should look for your projects.")
+    );
+    println!();
+    println!(
+        "{}",
+        text_style.render("  You can add multiple paths separated by commas:")
+    );
+    println!();
+    println!(
+        "{}",
+        hint_style.render("    💡 Example: ~/Projects, ~/work, ~/personal/repos")
+    );
+    println!();
+}
+
+/// Renders a prompt asking for paths
+pub fn render_paths_prompt() -> Result<String> {
+    let prompt_style = Style::new().bold(true).foreground(color_green());
+
+    print!("  {} ", prompt_style.render("❯ Paths:"));
+    io::stdout().flush().context("Failed to flush stdout")?;
+
+    let mut input = String::new();
+    io::stdin()
+        .read_line(&mut input)
+        .context("Failed to read input")?;
+
+    Ok(input.trim().to_string())
+}
+
+/// Renders a success message after config is created with all settings
+pub fn render_config_created(
+    paths: &[String],
+    max_depth: usize,
+    cache_enabled: bool,
+    cache_ttl_hours: u64,
+    windows: &[Window],
+) {
+    let success_style = Style::new().bold(true).foreground(color_green());
+    let label_style = Style::new().foreground(color_light_gray());
+    let value_style = Style::new().bold(true).foreground(color_blue());
+    let path_style = Style::new().foreground(color_blue());
+    let window_style = Style::new().foreground(color_purple());
+    let info_style = Style::new().foreground(color_dark_gray());
+    let bool_enabled_style = Style::new().bold(true).foreground(color_green());
+    let bool_disabled_style = Style::new().bold(true).foreground(color_orange());
+
+    println!();
+    println!("{}", success_style.render("  ✅ Configuration saved!"));
+    println!();
+
+    // Project discovery section
+    println!("{}", label_style.render("  📁 Project Discovery:"));
+    println!(
+        "    {} {} {}",
+        label_style.render("Max scan depth:"),
+        value_style.render(&max_depth.to_string()),
+        label_style.render("levels")
+    );
+    println!();
+
+    // Paths
+    println!("{}", label_style.render("  📂 Directories:"));
+    for path in paths {
+        println!("    {}", path_style.render(&format!("• {}", path)));
+    }
+    println!();
+
+    // Cache settings
+    println!("{}", label_style.render("  💾 Cache Settings:"));
+    let cache_status = if cache_enabled {
+        bool_enabled_style.render("enabled")
+    } else {
+        bool_disabled_style.render("disabled")
+    };
+    println!("    {} {}", label_style.render("Status:"), cache_status);
+    if cache_enabled {
+        println!(
+            "    {} {} {}",
+            label_style.render("TTL:"),
+            value_style.render(&cache_ttl_hours.to_string()),
+            label_style.render("hours")
+        );
+    }
+    println!();
+
+    // Default session
+    println!("{}", label_style.render("  🪟 Default Windows:"));
+    for window in windows {
+        println!("    {}", window_style.render(&format!("◦ {}", window.name)));
+        if !window.panes.is_empty() {
+            for (i, pane) in window.panes.iter().enumerate() {
+                let pane_display = if pane.is_empty() {
+                    format!("    └─ pane {} (shell)", i + 1)
+                } else {
+                    format!("    └─ pane {}: {}", i + 1, pane)
+                };
+                println!("{}", info_style.render(&pane_display));
+            }
+        }
+    }
+    println!();
+
+    println!(
+        "{}",
+        info_style.render(
+            "  ⚙️  You can edit ~/.config/tmuxido/tmuxido.toml anytime to change these settings."
+        )
+    );
+    println!();
+}
+
+/// Renders a warning when user provides no input (fallback to default)
+pub fn render_fallback_message() {
+    let warning_style = Style::new().italic(true).foreground(color_orange());
+
+    println!();
+    println!(
+        "{}",
+        warning_style.render("  ⚠️  No paths provided. Using default: ~/Projects")
+    );
+}
+
+/// Renders a section header for grouping related settings
+pub fn render_section_header(title: &str) {
+    let header_style = Style::new().bold(true).foreground(color_purple());
+
+    println!();
+    println!("{}", header_style.render(&format!("  📋 {}", title)));
+}
+
+/// Renders a prompt for max_depth with instructions
+pub fn render_max_depth_prompt() -> Result<String> {
+    let prompt_style = Style::new().bold(true).foreground(color_green());
+    let hint_style = Style::new().italic(true).foreground(color_dark_gray());
+
+    println!(
+        "{}",
+        hint_style.render("    How many levels deep should tmuxido search for git repositories?")
+    );
+    println!(
+        "{}",
+        hint_style.render("    Higher values = deeper search, but slower. Default: 5")
+    );
+    print!("  {} ", prompt_style.render("❯ Max depth:"));
+    io::stdout().flush().context("Failed to flush stdout")?;
+
+    let mut input = String::new();
+    io::stdin()
+        .read_line(&mut input)
+        .context("Failed to read input")?;
+
+    Ok(input.trim().to_string())
+}
+
+/// Renders a prompt for cache_enabled with instructions
+pub fn render_cache_enabled_prompt() -> Result<String> {
+    let prompt_style = Style::new().bold(true).foreground(color_green());
+    let hint_style = Style::new().italic(true).foreground(color_dark_gray());
+
+    println!(
+        "{}",
+        hint_style.render("    Enable caching to speed up project discovery?")
+    );
+    println!(
+        "{}",
+        hint_style.render("    Cache avoids rescanning unchanged directories. Default: yes (y)")
+    );
+    print!("  {} ", prompt_style.render("❯ Enable cache? (y/n):"));
+    io::stdout().flush().context("Failed to flush stdout")?;
+
+    let mut input = String::new();
+    io::stdin()
+        .read_line(&mut input)
+        .context("Failed to read input")?;
+
+    Ok(input.trim().to_lowercase())
+}
+
+/// Renders a prompt for cache_ttl_hours with instructions
+pub fn render_cache_ttl_prompt() -> Result<String> {
+    let prompt_style = Style::new().bold(true).foreground(color_green());
+    let hint_style = Style::new().italic(true).foreground(color_dark_gray());
+
+    println!(
+        "{}",
+        hint_style.render("    How long should the cache remain valid (in hours)?")
+    );
+    println!(
+        "{}",
+        hint_style.render("    After this time, tmuxido will rescan your directories. Default: 24")
+    );
+    print!("  {} ", prompt_style.render("❯ Cache TTL (hours):"));
+    io::stdout().flush().context("Failed to flush stdout")?;
+
+    let mut input = String::new();
+    io::stdin()
+        .read_line(&mut input)
+        .context("Failed to read input")?;
+
+    Ok(input.trim().to_string())
+}
+
+/// Renders a prompt for default session windows with instructions
+pub fn render_windows_prompt() -> Result<String> {
+    let prompt_style = Style::new().bold(true).foreground(color_green());
+    let hint_style = Style::new().italic(true).foreground(color_dark_gray());
+
+    println!(
+        "{}",
+        hint_style.render("    What windows should be created by default in new tmux sessions?")
+    );
+    println!(
+        "{}",
+        hint_style.render("    Enter window names separated by commas. Default: editor, terminal")
+    );
+    println!(
+        "{}",
+        hint_style.render("    💡 Tip: Common choices are 'editor', 'terminal', 'server', 'logs'")
+    );
+    print!("  {} ", prompt_style.render("❯ Window names:"));
+    io::stdout().flush().context("Failed to flush stdout")?;
+
+    let mut input = String::new();
+    io::stdin()
+        .read_line(&mut input)
+        .context("Failed to read input")?;
+
+    Ok(input.trim().to_string())
+}
+
+/// Renders a prompt asking for panes in a specific window
+pub fn render_panes_prompt(window_name: &str) -> Result<String> {
+    let prompt_style = Style::new().bold(true).foreground(color_green());
+    let hint_style = Style::new().italic(true).foreground(color_dark_gray());
+    let window_style = Style::new().bold(true).foreground(color_purple());
+
+    println!();
+    println!("  Configuring window: {}", window_style.render(window_name));
+    println!(
+        "{}",
+        hint_style
+            .render("    Enter pane names separated by commas, or leave empty for a single pane.")
+    );
+    println!("{}", hint_style.render("    💡 Example: code, logs, tests"));
+    print!("  {} ", prompt_style.render("❯ Pane names:"));
+    io::stdout().flush().context("Failed to flush stdout")?;
+
+    let mut input = String::new();
+    io::stdin()
+        .read_line(&mut input)
+        .context("Failed to read input")?;
+
+    Ok(input.trim().to_string())
+}
+
+/// Renders a prompt for a pane command
+pub fn render_pane_command_prompt(pane_name: &str) -> Result<String> {
+    let prompt_style = Style::new().bold(true).foreground(color_green());
+    let hint_style = Style::new().italic(true).foreground(color_dark_gray());
+    let pane_style = Style::new().foreground(color_blue());
+
+    println!(
+        "{}",
+        hint_style.render(&format!(
+            "    What command should run in pane '{}' on startup?",
+            pane_style.render(pane_name)
+        ))
+    );
+    println!(
+        "{}",
+        hint_style.render("    Leave empty to run the default shell, or enter a command like 'nvim', 'npm run dev'")
+    );
+    print!("  {} ", prompt_style.render("❯ Command:"));
+    io::stdout().flush().context("Failed to flush stdout")?;
+
+    let mut input = String::new();
+    io::stdin()
+        .read_line(&mut input)
+        .context("Failed to read input")?;
+
+    Ok(input.trim().to_string())
+}
+
+/// Parse max_depth input, returning None for empty/invalid (use default)
+pub fn parse_max_depth_input(input: &str) -> Option<usize> {
+    let trimmed = input.trim();
+    if trimmed.is_empty() {
+        return None;
+    }
+    trimmed.parse::<usize>().ok().filter(|&n| n > 0)
+}
+
+/// Parse cache enabled input, returning None for empty (use default)
+pub fn parse_cache_enabled_input(input: &str) -> Option<bool> {
+    let trimmed = input.trim().to_lowercase();
+    if trimmed.is_empty() {
+        return None;
+    }
+    match trimmed.as_str() {
+        "y" | "yes" => Some(true),
+        "n" | "no" => Some(false),
+        _ => None,
+    }
+}
+
+/// Parse cache TTL input, returning None for empty/invalid (use default)
+pub fn parse_cache_ttl_input(input: &str) -> Option<u64> {
+    let trimmed = input.trim();
+    if trimmed.is_empty() {
+        return None;
+    }
+    trimmed.parse::<u64>().ok().filter(|&n| n > 0)
+}
+
+/// Parse comma-separated list into Vec<String>, filtering empty items
+pub fn parse_comma_separated_list(input: &str) -> Vec<String> {
+    input
+        .trim()
+        .split(',')
+        .map(|s| s.trim().to_string())
+        .filter(|s| !s.is_empty())
+        .collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn should_return_none_for_empty_max_depth() {
+        assert_eq!(parse_max_depth_input(""), None);
+        assert_eq!(parse_max_depth_input("   "), None);
+    }
+
+    #[test]
+    fn should_parse_valid_max_depth() {
+        assert_eq!(parse_max_depth_input("5"), Some(5));
+        assert_eq!(parse_max_depth_input("10"), Some(10));
+        assert_eq!(parse_max_depth_input("  3  "), Some(3));
+    }
+
+    #[test]
+    fn should_return_none_for_invalid_max_depth() {
+        assert_eq!(parse_max_depth_input("0"), None);
+        assert_eq!(parse_max_depth_input("-1"), None);
+        assert_eq!(parse_max_depth_input("abc"), None);
+        assert_eq!(parse_max_depth_input("3.5"), None);
+    }
+
+    #[test]
+    fn should_return_none_for_empty_cache_enabled() {
+        assert_eq!(parse_cache_enabled_input(""), None);
+        assert_eq!(parse_cache_enabled_input("   "), None);
+    }
+
+    #[test]
+    fn should_parse_yes_as_true() {
+        assert_eq!(parse_cache_enabled_input("y"), Some(true));
+        assert_eq!(parse_cache_enabled_input("Y"), Some(true));
+        assert_eq!(parse_cache_enabled_input("yes"), Some(true));
+        assert_eq!(parse_cache_enabled_input("YES"), Some(true));
+        assert_eq!(parse_cache_enabled_input("Yes"), Some(true));
+    }
+
+    #[test]
+    fn should_parse_no_as_false() {
+        assert_eq!(parse_cache_enabled_input("n"), Some(false));
+        assert_eq!(parse_cache_enabled_input("N"), Some(false));
+        assert_eq!(parse_cache_enabled_input("no"), Some(false));
+        assert_eq!(parse_cache_enabled_input("NO"), Some(false));
+        assert_eq!(parse_cache_enabled_input("No"), Some(false));
+    }
+
+    #[test]
+    fn should_return_none_for_invalid_cache_input() {
+        assert_eq!(parse_cache_enabled_input("maybe"), None);
+        assert_eq!(parse_cache_enabled_input("true"), None);
+        assert_eq!(parse_cache_enabled_input("1"), None);
+    }
+
+    #[test]
+    fn should_return_none_for_empty_cache_ttl() {
+        assert_eq!(parse_cache_ttl_input(""), None);
+        assert_eq!(parse_cache_ttl_input("   "), None);
+    }
+
+    #[test]
+    fn should_parse_valid_cache_ttl() {
+        assert_eq!(parse_cache_ttl_input("24"), Some(24));
+        assert_eq!(parse_cache_ttl_input("12"), Some(12));
+        assert_eq!(parse_cache_ttl_input("  48  "), Some(48));
+    }
+
+    #[test]
+    fn should_return_none_for_invalid_cache_ttl() {
+        assert_eq!(parse_cache_ttl_input("0"), None);
+        assert_eq!(parse_cache_ttl_input("-1"), None);
+        assert_eq!(parse_cache_ttl_input("abc"), None);
+        assert_eq!(parse_cache_ttl_input("12.5"), None);
+    }
+
+    #[test]
+    fn should_parse_empty_comma_list() {
+        let result = parse_comma_separated_list("");
+        assert!(result.is_empty());
+    }
+
+    #[test]
+    fn should_parse_single_item() {
+        let result = parse_comma_separated_list("editor");
+        assert_eq!(result, vec!["editor"]);
+    }
+
+    #[test]
+    fn should_parse_multiple_items() {
+        let result = parse_comma_separated_list("editor, terminal, server");
+        assert_eq!(result, vec!["editor", "terminal", "server"]);
+    }
+
+    #[test]
+    fn should_trim_whitespace_in_comma_list() {
+        let result = parse_comma_separated_list("  editor  ,  terminal  ");
+        assert_eq!(result, vec!["editor", "terminal"]);
+    }
+
+    #[test]
+    fn should_filter_empty_parts_in_comma_list() {
+        let result = parse_comma_separated_list("editor,,terminal");
+        assert_eq!(result, vec!["editor", "terminal"]);
+    }
+
+    #[test]
+    fn color_blue_should_return_expected_rgb() {
+        let color = color_blue();
+        // We can't easily test the internal RGB values, but we can verify it doesn't panic
+        let _ = color;
+    }
+
+    #[test]
+    fn color_functions_should_return_distinct_colors() {
+        // Verify all color functions return valid Color objects
+        let colors = vec![
+            color_blue(),
+            color_purple(),
+            color_light_gray(),
+            color_dark_gray(),
+            color_green(),
+            color_orange(),
+        ];
+        // Just verify they don't panic and are distinct
+        assert_eq!(colors.len(), 6);
+    }
+
+    #[test]
+    fn render_section_header_should_not_panic() {
+        // This test verifies the function doesn't panic
+        // We can't capture stdout easily in unit tests without additional setup
+        render_section_header("Test Section");
+    }
+
+    #[test]
+    fn render_welcome_banner_should_not_panic() {
+        render_welcome_banner();
+    }
+
+    #[test]
+    fn render_fallback_message_should_not_panic() {
+        render_fallback_message();
+    }
+
+    #[test]
+    fn render_config_created_should_not_panic() {
+        let windows = vec![
+            Window {
+                name: "editor".to_string(),
+                panes: vec!["nvim .".to_string()],
+                layout: None,
+            },
+            Window {
+                name: "terminal".to_string(),
+                panes: vec![],
+                layout: None,
+            },
+        ];
+        render_config_created(&vec!["~/Projects".to_string()], 5, true, 24, &windows);
+    }
+
+    #[test]
+    fn render_config_created_with_disabled_cache_should_not_panic() {
+        let windows = vec![Window {
+            name: "editor".to_string(),
+            panes: vec![],
+            layout: None,
+        }];
+        render_config_created(&vec!["~/work".to_string()], 3, false, 24, &windows);
+    }
+}

src/update_check.rs

@@ -0,0 +1,219 @@
+use anyhow::Result;
+use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
+use std::time::{SystemTime, UNIX_EPOCH};
+
+use crate::config::Config;
+use crate::self_update;
+
+#[derive(Debug, Default, Serialize, Deserialize)]
+struct UpdateCheckCache {
+    last_checked: u64,
+    latest_version: String,
+}
+
+pub fn check_and_notify(config: &Config) {
+    let cache = load_cache();
+    check_and_notify_internal(
+        config.update_check_interval_hours,
+        cache,
+        &|| self_update::fetch_latest_tag(),
+        &save_cache,
+    );
+}
+
+fn check_and_notify_internal(
+    interval_hours: u64,
+    mut cache: UpdateCheckCache,
+    fetcher: &dyn Fn() -> Result<String>,
+    saver: &dyn Fn(&UpdateCheckCache),
+) -> bool {
+    if interval_hours == 0 {
+        return false;
+    }
+
+    let elapsed = elapsed_hours(cache.last_checked);
+
+    if elapsed >= interval_hours
+        && let Ok(latest) = fetcher()
+    {
+        let latest_clean = latest.trim_start_matches('v').to_string();
+        let now = SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .unwrap_or_default()
+            .as_secs();
+        cache.last_checked = now;
+        cache.latest_version = latest_clean;
+        saver(&cache);
+    }
+
+    let current = self_update::current_version();
+    let latest_clean = cache.latest_version.trim_start_matches('v');
+    if !latest_clean.is_empty()
+        && self_update::version_compare(latest_clean, current) == std::cmp::Ordering::Greater
+    {
+        print_update_notice(current, latest_clean);
+        return true;
+    }
+
+    false
+}
+
+fn print_update_notice(current: &str, latest: &str) {
+    let msg1 = format!("  Update available: {} \u{2192} {}  ", current, latest);
+    let msg2 = "  Run tmuxido --update to install.  ";
+    let w1 = msg1.chars().count();
+    let w2 = msg2.chars().count();
+    let width = w1.max(w2);
+    let border = "\u{2500}".repeat(width);
+    println!("\u{250c}{}\u{2510}", border);
+    println!("\u{2502}{}\u{2502}", pad_to_chars(&msg1, width));
+    println!("\u{2502}{}\u{2502}", pad_to_chars(msg2, width));
+    println!("\u{2514}{}\u{2518}", border);
+}
+
+fn pad_to_chars(s: &str, width: usize) -> String {
+    let char_count = s.chars().count();
+    if char_count >= width {
+        s.to_string()
+    } else {
+        format!("{}{}", s, " ".repeat(width - char_count))
+    }
+}
+
+fn cache_path() -> Result<PathBuf> {
+    let cache_dir = dirs::cache_dir()
+        .ok_or_else(|| anyhow::anyhow!("Could not determine cache directory"))?
+        .join("tmuxido");
+    Ok(cache_dir.join("update_check.json"))
+}
+
+fn load_cache() -> UpdateCheckCache {
+    cache_path()
+        .ok()
+        .and_then(|p| std::fs::read_to_string(p).ok())
+        .and_then(|s| serde_json::from_str(&s).ok())
+        .unwrap_or_default()
+}
+
+fn save_cache(cache: &UpdateCheckCache) {
+    if let Ok(path) = cache_path() {
+        if let Some(parent) = path.parent() {
+            let _ = std::fs::create_dir_all(parent);
+        }
+        if let Ok(json) = serde_json::to_string(cache) {
+            let _ = std::fs::write(path, json);
+        }
+    }
+}
+
+fn elapsed_hours(ts: u64) -> u64 {
+    let now = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap_or_default()
+        .as_secs();
+    now.saturating_sub(ts) / 3600
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::cell::RefCell;
+
+    fn make_cache(last_checked: u64, latest_version: &str) -> UpdateCheckCache {
+        UpdateCheckCache {
+            last_checked,
+            latest_version: latest_version.to_string(),
+        }
+    }
+
+    fn now_ts() -> u64 {
+        SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .unwrap_or_default()
+            .as_secs()
+    }
+
+    #[test]
+    fn should_not_notify_when_interval_is_zero() {
+        let cache = make_cache(0, "99.0.0");
+        let fetcher_called = RefCell::new(false);
+
+        let result = check_and_notify_internal(
+            0,
+            cache,
+            &|| {
+                *fetcher_called.borrow_mut() = true;
+                Ok("99.0.0".to_string())
+            },
+            &|_| {},
+        );
+
+        assert!(!result);
+        assert!(!fetcher_called.into_inner());
+    }
+
+    #[test]
+    fn should_not_check_when_interval_not_elapsed() {
+        let cache = make_cache(now_ts(), "");
+        let fetcher_called = RefCell::new(false);
+
+        check_and_notify_internal(
+            24,
+            cache,
+            &|| {
+                *fetcher_called.borrow_mut() = true;
+                Ok("99.0.0".to_string())
+            },
+            &|_| {},
+        );
+
+        assert!(!fetcher_called.into_inner());
+    }
+
+    #[test]
+    fn should_check_when_interval_elapsed() {
+        let cache = make_cache(0, "");
+        let fetcher_called = RefCell::new(false);
+
+        check_and_notify_internal(
+            1,
+            cache,
+            &|| {
+                *fetcher_called.borrow_mut() = true;
+                Ok(self_update::current_version().to_string())
+            },
+            &|_| {},
+        );
+
+        assert!(fetcher_called.into_inner());
+    }
+
+    #[test]
+    fn should_not_notify_when_versions_equal() {
+        let current = self_update::current_version();
+        let cache = make_cache(now_ts(), current);
+
+        let result = check_and_notify_internal(24, cache, &|| unreachable!(), &|_| {});
+
+        assert!(!result);
+    }
+
+    #[test]
+    fn should_detect_update_available() {
+        let cache = make_cache(now_ts(), "99.0.0");
+
+        let result = check_and_notify_internal(24, cache, &|| unreachable!(), &|_| {});
+
+        assert!(result);
+    }
+
+    #[test]
+    fn should_not_detect_update_when_current_is_newer() {
+        let cache = make_cache(now_ts(), "0.0.1");
+
+        let result = check_and_notify_internal(24, cache, &|| unreachable!(), &|_| {});
+
+        assert!(!result);
+    }
+}

tests/cache_lifecycle.rs

@@ -0,0 +1,13 @@
+use std::collections::HashMap;
+use std::path::PathBuf;
+use tmuxido::cache::ProjectCache;
+
+#[test]
+fn should_save_and_reload_cache() {
+    let projects = vec![PathBuf::from("/tmp/test_tmuxido_project")];
+    let cache = ProjectCache::new(projects.clone(), HashMap::new());
+    cache.save().unwrap();
+
+    let loaded = ProjectCache::load().unwrap().unwrap();
+    assert_eq!(loaded.projects, projects);
+}

tests/deps.rs

@@ -0,0 +1,137 @@
+use tmuxido::deps::{
+    BinaryChecker, Dep, PackageManager, SystemBinaryChecker, check_missing, detect_package_manager,
+};
+
+// --- SystemBinaryChecker (real system calls) ---
+
+#[test]
+fn system_checker_finds_sh_binary() {
+    let checker = SystemBinaryChecker;
+    assert!(
+        checker.is_available("sh"),
+        "`sh` must be present on any Unix system"
+    );
+}
+
+#[test]
+fn system_checker_returns_false_for_nonexistent_binary() {
+    let checker = SystemBinaryChecker;
+    assert!(!checker.is_available("tmuxido_nonexistent_xyz_42"));
+}
+
+// --- detect_package_manager on real system ---
+
+#[test]
+fn should_detect_some_package_manager_on_linux() {
+    let checker = SystemBinaryChecker;
+    let pm = detect_package_manager(&checker);
+    assert!(
+        pm.is_some(),
+        "Expected to detect at least one package manager on this Linux system"
+    );
+}
+
+// --- PackageManager metadata completeness ---
+
+#[test]
+fn all_package_managers_have_non_empty_detection_binary() {
+    for pm in PackageManager::all_ordered() {
+        assert!(
+            !pm.detection_binary().is_empty(),
+            "{:?} has empty detection binary",
+            pm
+        );
+    }
+}
+
+#[test]
+fn all_package_managers_have_non_empty_display_name() {
+    for pm in PackageManager::all_ordered() {
+        assert!(
+            !pm.display_name().is_empty(),
+            "{:?} has empty display name",
+            pm
+        );
+    }
+}
+
+#[test]
+fn install_command_always_starts_with_sudo() {
+    let packages = &["fzf", "tmux"];
+    for pm in PackageManager::all_ordered() {
+        let cmd = pm.install_command(packages);
+        assert_eq!(
+            cmd.first().map(String::as_str),
+            Some("sudo"),
+            "{} install command should start with sudo",
+            pm.display_name()
+        );
+    }
+}
+
+#[test]
+fn install_command_always_contains_requested_packages() {
+    let packages = &["fzf", "tmux"];
+    for pm in PackageManager::all_ordered() {
+        let cmd = pm.install_command(packages);
+        assert!(
+            cmd.contains(&"fzf".to_string()),
+            "{} command missing 'fzf'",
+            pm.display_name()
+        );
+        assert!(
+            cmd.contains(&"tmux".to_string()),
+            "{} command missing 'tmux'",
+            pm.display_name()
+        );
+    }
+}
+
+// --- Dep completeness ---
+
+#[test]
+fn dep_package_names_are_standard() {
+    assert_eq!(Dep::Fzf.package_name(), "fzf");
+    assert_eq!(Dep::Tmux.package_name(), "tmux");
+}
+
+#[test]
+fn all_deps_have_matching_binary_and_package_names() {
+    for dep in Dep::all() {
+        assert!(!dep.binary_name().is_empty());
+        assert!(!dep.package_name().is_empty());
+    }
+}
+
+// --- check_missing on real system ---
+
+#[test]
+fn check_missing_returns_only_actually_missing_tools() {
+    let checker = SystemBinaryChecker;
+    let missing = check_missing(&checker);
+    // Every item reported as missing must NOT be findable via `which`
+    for dep in &missing {
+        assert!(
+            !checker.is_available(dep.binary_name()),
+            "{} reported as missing but `which` finds it",
+            dep.binary_name()
+        );
+    }
+}
+
+#[test]
+fn check_missing_does_not_report_present_tools_as_missing() {
+    let checker = SystemBinaryChecker;
+    let missing = check_missing(&checker);
+    // Every dep NOT in missing list must be available
+    let missing_names: Vec<&str> = missing.iter().map(|d| d.binary_name()).collect();
+    for dep in Dep::all() {
+        if !missing_names.contains(&dep.binary_name()) {
+            assert!(
+                checker.is_available(dep.binary_name()),
+                "{} not in missing list but `which` can't find it",
+                dep.binary_name()
+            );
+        }
+    }
+}

tests/docker/Dockerfile

@@ -0,0 +1,43 @@
+# syntax=docker/dockerfile:1
+
+# ---- Stage 1: Build (Rust stable on Debian slim) ----
+FROM rust:1-slim AS builder
+
+WORKDIR /src
+
+# Copy manifests first so cargo can resolve deps (layer cache friendly)
+COPY Cargo.toml Cargo.lock rust-toolchain.toml ./
+
+# Copy source and build release binary
+COPY src/ ./src/
+RUN cargo build --release --locked
+
+# ---- Stage 2: Test environment (fresh Ubuntu, no fzf/tmux) ----
+FROM ubuntu:24.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install only what's needed to run the test suite itself
+# (git + sudo so Test 7 can install fzf/tmux via apt)
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        sudo \
+        git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create an unprivileged user with passwordless sudo
+# (simulates a regular developer who can install packages)
+RUN useradd -m -s /bin/bash testuser \
+    && echo "testuser ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
+
+# Install the tmuxido binary built in stage 1
+COPY --from=builder /src/target/release/tmuxido /usr/local/bin/tmuxido
+
+# Copy and register the test entrypoint
+COPY tests/docker/entrypoint.sh /usr/local/bin/entrypoint.sh
+RUN chmod +x /usr/local/bin/entrypoint.sh
+
+USER testuser
+WORKDIR /home/testuser
+
+ENTRYPOINT ["entrypoint.sh"]

tests/docker/entrypoint.sh

@@ -0,0 +1,185 @@
+#!/usr/bin/env bash
+# Test suite executed inside the Ubuntu container.
+# Simulates a brand-new user running tmuxido for the first time.
+set -uo pipefail
+
+PASS=0
+FAIL=0
+
+pass() { echo "  ✓ $1"; PASS=$((PASS + 1)); }
+fail() { echo "  ✗ $1"; FAIL=$((FAIL + 1)); }
+
+section() {
+    echo ""
+    echo "┌─ $1"
+}
+
+# ---------------------------------------------------------------------------
+# Phase 1 — fzf and tmux are NOT installed yet
+# ---------------------------------------------------------------------------
+
+echo ""
+echo "╔══════════════════════════════════════════════════════════╗"
+echo "║   tmuxido — Container Integration Tests (Ubuntu 24.04)  ║"
+echo "╚══════════════════════════════════════════════════════════╝"
+
+section "Phase 1: binary basics"
+
+# T1 — binary is in PATH and executable
+if command -v tmuxido &>/dev/null; then
+    pass "tmuxido found in PATH ($(command -v tmuxido))"
+else
+    fail "tmuxido not found in PATH"
+fi
+
+# T2 — --help exits 0
+if tmuxido --help >/dev/null 2>&1; then
+    pass "--help exits with code 0"
+else
+    fail "--help returned non-zero"
+fi
+
+# T3 — --version shows the package name
+VERSION_OUT=$(tmuxido --version 2>&1 || true)
+if echo "$VERSION_OUT" | grep -q "tmuxido"; then
+    pass "--version output contains 'tmuxido' → $VERSION_OUT"
+else
+    fail "--version output unexpected: $VERSION_OUT"
+fi
+
+# ---------------------------------------------------------------------------
+# Phase 2 — dependency detection (fzf and tmux absent)
+# ---------------------------------------------------------------------------
+
+section "Phase 2: dependency detection (fzf and tmux not installed)"
+
+# Pipe "n" so tmuxido declines to install and exits
+DEP_OUT=$(echo "n" | tmuxido 2>&1 || true)
+
+# T4 — fzf reported as missing
+if echo "$DEP_OUT" | grep -q "fzf"; then
+    pass "fzf detected as missing"
+else
+    fail "fzf NOT detected as missing. Full output:\n$DEP_OUT"
+fi
+
+# T5 — tmux reported as missing
+if echo "$DEP_OUT" | grep -q "tmux"; then
+    pass "tmux detected as missing"
+else
+    fail "tmux NOT detected as missing. Full output:\n$DEP_OUT"
+fi
+
+# T6 — "not installed" heading appears
+if echo "$DEP_OUT" | grep -q "not installed"; then
+    pass "User-facing 'not installed' message shown"
+else
+    fail "'not installed' message missing. Full output:\n$DEP_OUT"
+fi
+
+# T7 — apt detected as package manager (Ubuntu 24.04)
+if echo "$DEP_OUT" | grep -q "apt"; then
+    pass "apt detected as the package manager"
+else
+    fail "apt NOT detected. Full output:\n$DEP_OUT"
+fi
+
+# T8 — install command includes sudo apt install
+if echo "$DEP_OUT" | grep -q "sudo apt install"; then
+    pass "Install command 'sudo apt install' shown to user"
+else
+    fail "Install command incorrect. Full output:\n$DEP_OUT"
+fi
+
+# T9 — cancellation message when user answers "n"
+if echo "$DEP_OUT" | grep -q "cancelled\|Cancelled\|manually"; then
+    pass "Graceful cancellation message shown"
+else
+    fail "Cancellation message missing. Full output:\n$DEP_OUT"
+fi
+
+# ---------------------------------------------------------------------------
+# Phase 3 — install deps and run full workflow
+# ---------------------------------------------------------------------------
+
+section "Phase 3: full workflow (after installing fzf, tmux and git)"
+
+echo "    Installing fzf, tmux via apt (this may take a moment)..."
+sudo apt-get update -qq 2>/dev/null
+sudo apt-get install -y --no-install-recommends fzf tmux 2>/dev/null
+
+# T10 — fzf now available
+if command -v fzf &>/dev/null; then
+    pass "fzf installed successfully ($(fzf --version 2>&1 | head -1))"
+else
+    fail "fzf still not available after installation"
+fi
+
+# T11 — tmux now available
+if command -v tmux &>/dev/null; then
+    pass "tmux installed successfully ($(tmux -V))"
+else
+    fail "tmux still not available after installation"
+fi
+
+# T12 — tmuxido no longer triggers dependency prompt
+NO_DEP_OUT=$(echo "" | tmuxido 2>&1 || true)
+if echo "$NO_DEP_OUT" | grep -q "not installed"; then
+    fail "Dependency prompt still shown after installing deps"
+else
+    pass "No dependency prompt after deps are installed"
+fi
+
+# T13 — set up a minimal git project tree for scanning
+mkdir -p ~/Projects/demo-app
+git -C ~/Projects/demo-app init --quiet
+git -C ~/Projects/demo-app config user.email "test@test.com"
+git -C ~/Projects/demo-app config user.name "Test"
+
+mkdir -p ~/.config/tmuxido
+cat > ~/.config/tmuxido/tmuxido.toml <<'EOF'
+paths = ["~/Projects"]
+max_depth = 3
+cache_enabled = true
+EOF
+
+# T13 — --refresh scans and finds our demo project
+REFRESH_OUT=$(tmuxido --refresh 2>&1 || true)
+if echo "$REFRESH_OUT" | grep -q "projects\|Projects"; then
+    pass "--refresh scanned and reported projects"
+else
+    fail "--refresh output unexpected: $REFRESH_OUT"
+fi
+
+# T14 — --cache-status reports the cache that was just built
+CACHE_OUT=$(tmuxido --cache-status 2>&1 || true)
+if echo "$CACHE_OUT" | grep -qi "cache"; then
+    pass "--cache-status reports cache info"
+else
+    fail "--cache-status output unexpected: $CACHE_OUT"
+fi
+
+# T15 — cache contains our demo project
+if echo "$CACHE_OUT" | grep -q "Projects cached: [^0]"; then
+    pass "Cache contains at least 1 project"
+else
+    # Try alternate grep in case format differs
+    if echo "$CACHE_OUT" | grep -q "cached:"; then
+        pass "--cache-status shows cached projects (count check skipped)"
+    else
+        fail "Cache appears empty. Output: $CACHE_OUT"
+    fi
+fi
+
+# ---------------------------------------------------------------------------
+# Summary
+# ---------------------------------------------------------------------------
+
+echo ""
+echo "╔══════════════════════════════════════════════════════════╗"
+printf "║  Results: %-3d passed, %-3d failed%*s║\n" \
+    "$PASS" "$FAIL" $((24 - ${#PASS} - ${#FAIL})) ""
+echo "╚══════════════════════════════════════════════════════════╝"
+echo ""
+
+[ "$FAIL" -eq 0 ]

tests/docker/run.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+# Build the tmuxido Docker test image and run the container integration tests.
+#
+# Usage:
+#   ./tests/docker/run.sh            # build + run
+#   ./tests/docker/run.sh --no-cache # force rebuild from scratch
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+IMAGE_NAME="tmuxido-test"
+
+# Propagate --no-cache if requested
+BUILD_FLAGS=()
+if [[ "${1:-}" == "--no-cache" ]]; then
+    BUILD_FLAGS+=(--no-cache)
+fi
+
+echo "╔══════════════════════════════════════════════════════════╗"
+echo "║         tmuxido — Docker Integration Test Runner        ║"
+echo "╚══════════════════════════════════════════════════════════╝"
+echo ""
+echo "Project root : $PROJECT_ROOT"
+echo "Dockerfile   : $SCRIPT_DIR/Dockerfile"
+echo "Image name   : $IMAGE_NAME"
+echo ""
+
+# ---- Build ----------------------------------------------------------------
+echo "Building image (stage 1: rust compile, stage 2: ubuntu test env)..."
+docker build \
+    "${BUILD_FLAGS[@]}" \
+    --tag "$IMAGE_NAME" \
+    --file "$SCRIPT_DIR/Dockerfile" \
+    "$PROJECT_ROOT"
+
+echo ""
+echo "Build complete. Running tests..."
+echo ""
+
+# ---- Run ------------------------------------------------------------------
+docker run \
+    --rm \
+    --name "${IMAGE_NAME}-run" \
+    "$IMAGE_NAME"
+
+EXIT=$?
+
+if [ "$EXIT" -eq 0 ]; then
+    echo "All tests passed."
+else
+    echo "Some tests FAILED (exit $EXIT)."
+fi
+
+exit "$EXIT"

tests/scan.rs

@@ -0,0 +1,66 @@
+use std::fs;
+use tempfile::tempdir;
+use tmuxido::config::Config;
+use tmuxido::scan_from_root;
+use tmuxido::session::SessionConfig;
+
+fn make_config(max_depth: usize) -> Config {
+    Config {
+        paths: vec![],
+        max_depth,
+        cache_enabled: true,
+        cache_ttl_hours: 24,
+        update_check_interval_hours: 24,
+        default_session: SessionConfig { windows: vec![] },
+    }
+}
+
+/// `tempfile::tempdir()` creates hidden dirs (e.g. `/tmp/.tmpXXXXXX`) on this
+/// system, which `scan_from_root`'s `filter_entry` would skip. Create a
+/// visible subdirectory to use as the actual scan root.
+fn make_scan_root() -> (tempfile::TempDir, std::path::PathBuf) {
+    let dir = tempdir().unwrap();
+    let root = dir.path().join("scan_root");
+    fs::create_dir_all(&root).unwrap();
+    (dir, root)
+}
+
+#[test]
+fn should_find_git_repos_in_temp_dir() {
+    let (_dir, root) = make_scan_root();
+    fs::create_dir_all(root.join("foo/.git")).unwrap();
+    fs::create_dir_all(root.join("bar/.git")).unwrap();
+
+    let config = make_config(5);
+    let (projects, _) = scan_from_root(&root, &config).unwrap();
+
+    assert_eq!(projects.len(), 2);
+    assert!(projects.iter().any(|p| p.ends_with("foo")));
+    assert!(projects.iter().any(|p| p.ends_with("bar")));
+}
+
+#[test]
+fn should_not_descend_into_hidden_dirs() {
+    let (_dir, root) = make_scan_root();
+    fs::create_dir_all(root.join(".hidden/repo/.git")).unwrap();
+
+    let config = make_config(5);
+    let (projects, _) = scan_from_root(&root, &config).unwrap();
+
+    assert!(projects.is_empty());
+}
+
+#[test]
+fn should_respect_max_depth() {
+    let (_dir, root) = make_scan_root();
+    // Shallow: project/.git at depth 2 from root — found with max_depth=2
+    fs::create_dir_all(root.join("project/.git")).unwrap();
+    // Deep: nested/deep/project/.git at depth 4 — excluded with max_depth=2
+    fs::create_dir_all(root.join("nested/deep/project/.git")).unwrap();
+
+    let config = make_config(2);
+    let (projects, _) = scan_from_root(&root, &config).unwrap();
+
+    assert_eq!(projects.len(), 1);
+    assert!(projects[0].ends_with("project"));
+}

tests/session_config.rs

@@ -0,0 +1,26 @@
+use std::fs;
+use tempfile::tempdir;
+use tmuxido::session::SessionConfig;
+
+#[test]
+fn should_load_project_session_config() {
+    let dir = tempdir().unwrap();
+    let config_content = r#"
+        [[windows]]
+        name = "editor"
+        panes = ["nvim ."]
+    "#;
+    fs::write(dir.path().join(".tmuxido.toml"), config_content).unwrap();
+
+    let result = SessionConfig::load_from_project(dir.path()).unwrap();
+    assert!(result.is_some());
+    let config = result.unwrap();
+    assert_eq!(config.windows[0].name, "editor");
+}
+
+#[test]
+fn should_return_none_when_no_project_config() {
+    let dir = tempdir().unwrap();
+    let result = SessionConfig::load_from_project(dir.path()).unwrap();
+    assert!(result.is_none());
+}

tmuxido.toml.example

@@ -0,0 +1,218 @@
+# ============================================================================
+# tmuxido - Global Configuration
+# ============================================================================
+# Location: ~/.config/tmuxido/tmuxido.toml
+#
+# This is the main configuration file that controls:
+# 1. Where to search for projects
+# 2. Caching behavior
+# 3. Default session layout (used when projects don't have .tmuxido.toml)
+#
+# Compatible with any tmux base-index setting (0 or 1, auto-detected)
+# ============================================================================
+
+# ============================================================================
+# PROJECT DISCOVERY
+# ============================================================================
+# Paths where tmuxido will search for git repositories
+# Supports ~ for home directory expansion
+
+paths = [
+    "~/Projects",
+    # "~/work",
+    # "~/opensource",
+    # "~/clients/company-name",
+]
+
+# Maximum directory depth to search for .git folders
+# Higher values = slower scan, but finds deeply nested projects
+# Lower values = faster scan, but might miss some projects
+# Default: 5
+max_depth = 5
+
+# ============================================================================
+# CACHING CONFIGURATION
+# ============================================================================
+# Caching dramatically speeds up subsequent runs by storing discovered projects
+
+# Enable/disable project caching
+# Default: true
+cache_enabled = true
+
+# How long (in hours) before cache is considered stale and refreshed
+# Set lower if you frequently add new projects
+# Set higher if your projects are stable
+# Default: 24
+cache_ttl_hours = 24
+
+# Cache location: ~/.cache/tmuxido/projects.json
+# Use --refresh flag to force cache update
+# Use --cache-status to see cache information
+
+# ============================================================================
+# DEFAULT SESSION CONFIGURATION
+# ============================================================================
+# This configuration is used for projects that don't have their own
+# .tmuxido.toml file in the project root.
+#
+# You can customize this to match your preferred workflow!
+# ============================================================================
+
+[default_session]
+
+# --- OPTION 1: Simple two-window setup (CURRENT DEFAULT) ---
+[[default_session.windows]]
+name = "editor"
+panes = []
+
+[[default_session.windows]]
+name = "terminal"
+panes = []
+
+# --- OPTION 2: Single window with nvim and terminal split ---
+# Uncomment this and comment out Option 1 above
+# [[default_session.windows]]
+# name = "work"
+# layout = "main-horizontal"
+# panes = [
+#     "nvim .",      # Main pane: Editor
+#     "clear",       # Bottom left: Terminal
+#     "clear"        # Bottom right: Terminal
+# ]
+
+# --- OPTION 3: Three-window workflow (code, run, git) ---
+# Uncomment this and comment out Option 1 above
+# [[default_session.windows]]
+# name = "code"
+# layout = "main-vertical"
+# panes = ["nvim .", "clear"]
+#
+# [[default_session.windows]]
+# name = "run"
+# panes = []
+#
+# [[default_session.windows]]
+# name = "git"
+# panes = []
+
+# --- OPTION 4: Full development setup ---
+# Uncomment this and comment out Option 1 above
+# [[default_session.windows]]
+# name = "editor"
+# layout = "main-horizontal"
+# panes = ["nvim .", "clear", "clear"]
+#
+# [[default_session.windows]]
+# name = "server"
+# panes = []
+#
+# [[default_session.windows]]
+# name = "logs"
+# panes = []
+#
+# [[default_session.windows]]
+# name = "git"
+# panes = ["git status"]
+
+# ============================================================================
+# AVAILABLE LAYOUTS
+# ============================================================================
+# Use these layout values in your windows:
+#
+# main-horizontal:  Main pane on top, others below
+#   ┌─────────────────────────────┐
+#   │         Main Pane           │
+#   ├──────────────┬──────────────┤
+#   │   Pane 2     │   Pane 3     │
+#   └──────────────┴──────────────┘
+#
+# main-vertical:    Main pane on left, others on right
+#   ┌──────────┬──────────┐
+#   │          │ Pane 2   │
+#   │   Main   ├──────────┤
+#   │   Pane   │ Pane 3   │
+#   └──────────┴──────────┘
+#
+# tiled:            All panes in a grid
+#   ┌──────────┬──────────┐
+#   │ Pane 1   │ Pane 2   │
+#   ├──────────┼──────────┤
+#   │ Pane 3   │ Pane 4   │
+#   └──────────┴──────────┘
+#
+# even-horizontal:  All panes in equal-width columns
+#   ┌────┬────┬────┬────┐
+#   │ P1 │ P2 │ P3 │ P4 │
+#   └────┴────┴────┴────┘
+#
+# even-vertical:    All panes in equal-height rows
+#   ┌──────────────┐
+#   │   Pane 1     │
+#   ├──────────────┤
+#   │   Pane 2     │
+#   ├──────────────┤
+#   │   Pane 3     │
+#   └──────────────┘
+
+# ============================================================================
+# USAGE EXAMPLES
+# ============================================================================
+# Run without arguments (uses fzf to select project):
+#   $ tmuxido
+#
+# Open specific project directly:
+#   $ tmuxido /path/to/project
+#
+# Force refresh cache (after adding new projects):
+#   $ tmuxido --refresh
+#   $ tmuxido -r
+#
+# Check cache status:
+#   $ tmuxido --cache-status
+#
+# Show help:
+#   $ tmuxido --help
+
+# ============================================================================
+# PROJECT-SPECIFIC OVERRIDES
+# ============================================================================
+# To customize a specific project, create .tmuxido.toml in that
+# project's root directory. See .tmuxido.toml.example for details.
+#
+# Hierarchy:
+#   1. Project's .tmuxido.toml (highest priority)
+#   2. Global [default_session] from this file (fallback)
+
+# ============================================================================
+# TIPS & BEST PRACTICES
+# ============================================================================
+# 1. Start with the simple Option 1 default, customize as you learn
+# 2. Use project-specific configs for special projects (web apps, etc)
+# 3. Set cache_ttl_hours lower (6-12) if you frequently add projects
+# 4. Add multiple paths to organize personal vs work vs open-source
+# 5. Use max_depth wisely - higher isn't always better (slower scans)
+# 6. Run --cache-status to verify your settings are working
+# 7. The tool auto-detects your tmux base-index (0 or 1), no config needed
+# 8. Empty panes = shell in project directory (fastest to open)
+# 9. Commands in panes run automatically when session is created
+# 10. Use "clear" in panes for clean shells without running commands
+
+# ============================================================================
+# TROUBLESHOOTING
+# ============================================================================
+# Projects not showing up?
+#   - Check that paths exist and contain .git directories
+#   - Increase max_depth if projects are nested deeper
+#   - Run with --refresh to force cache update
+#
+# Cache seems stale?
+#   - Run tmuxido --refresh
+#   - Lower cache_ttl_hours value
+#
+# Windows/panes not created correctly?
+#   - Tool auto-detects base-index, but verify with: tmux show-options -g base-index
+#   - Check TOML syntax in default_session or project config
+#
+# Want to reset to defaults?
+#   - Delete this file, it will be recreated on next run
+#   - Or copy from: /path/to/repo/tmuxido.toml.example