# Architecture

## Overview

`git-tui` is a single executable Python script that provides a terminal UI for common Git commands.

## Module Responsibilities

- `git-tui`:
  - Initializes and runs the curses application loop.
  - Renders a menu-driven UI with keyboard navigation.
  - Executes Git subprocess commands and displays command output.
  - Implements file selection for staged and unstaged operations.

## Public API and Contracts

- Command entry point: `git-tui` executable script.
- Runtime contract:
  - Must be executed in a terminal that supports curses.
  - Must be run from a directory inside a Git working tree.
  - Requires `git` to be installed and available in `PATH`.

## Data Model

- `ChangedFile`:
  - `index_status`: index status marker from `git status --short`.
  - `worktree_status`: worktree status marker from `git status --short`.
  - `path`: repository-relative file path.

## Build and Deployment Rules

- No build step is required.
- Deployment is a direct executable file install (copy or symlink).

## Cross References

- Usage and install details: [`doc/usage.md`](usage.md)
- Change tracking: [`CHANGELOG.md`](../CHANGELOG.md)