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mod app;
mod error;
mod handler;
mod input;
mod model;
mod output;
mod persistence;
mod syntax;
mod text_edit;
mod theme;
mod ui;
mod update;
mod vcs;
use std::fs::File;
use std::io::{self, Write};
use std::sync::mpsc;
use std::time::{Duration, Instant};
use crossterm::{
event::{
self, DisableMouseCapture, EnableMouseCapture, Event, KeyEventKind,
KeyboardEnhancementFlags, PopKeyboardEnhancementFlags, PushKeyboardEnhancementFlags,
},
execute,
terminal::{
EnterAlternateScreen, LeaveAlternateScreen, disable_raw_mode, enable_raw_mode,
supports_keyboard_enhancement,
},
};
use ratatui::{Terminal, backend::CrosstermBackend};
use app::{App, FocusedPanel, InputMode};
use handler::{
handle_command_action, handle_comment_action, handle_commit_select_action,
handle_confirm_action, handle_diff_action, handle_file_list_action, handle_help_action,
handle_search_action, handle_visual_action,
};
use input::{Action, map_key_to_action};
use theme::{parse_cli_args, resolve_theme};
/// Timeout for the "press Ctrl+C again to exit" feature
const CTRL_C_EXIT_TIMEOUT: Duration = Duration::from_secs(2);
fn main() -> anyhow::Result<()> {
// Setup panic hook to restore terminal on panic
let original_hook = std::panic::take_hook();
std::panic::set_hook(Box::new(move |panic_info| {
let _ = execute!(io::stdout(), PopKeyboardEnhancementFlags);
let _ = execute!(io::stdout(), DisableMouseCapture);
let _ = disable_raw_mode();
let _ = execute!(io::stdout(), LeaveAlternateScreen);
original_hook(panic_info);
}));
// Check keyboard enhancement support before enabling raw mode
let keyboard_enhancement_supported = matches!(supports_keyboard_enhancement(), Ok(true));
// Parse CLI arguments and resolve theme
// This also configures syntax highlighting colors before diff parsing
let cli_args = parse_cli_args();
let theme = resolve_theme(cli_args.theme);
// Start update check in background (non-blocking)
let update_rx = if !cli_args.no_update_check {
let (tx, rx) = mpsc::channel();
std::thread::spawn(move || {
let result = update::check_for_updates();
let _ = tx.send(result); // Ignore send error if receiver dropped
});
Some(rx)
} else {
None
};
// Initialize app
let mut app = match App::new(theme, cli_args.output_to_stdout) {
Ok(mut app) => {
app.supports_keyboard_enhancement = keyboard_enhancement_supported;
app
}
Err(e) => {
eprintln!("Error: {e}");
eprintln!(
"\nMake sure you're in a git, jujutsu, or mercurial repository with uncommitted changes."
);
std::process::exit(1);
}
};
// Setup terminal
// When --stdout is used, render TUI to /dev/tty so stdout is free for export output
enable_raw_mode()?;
let mut tty_output: Box<dyn Write> = if cli_args.output_to_stdout {
Box::new(File::options().write(true).open("/dev/tty")?)
} else {
Box::new(io::stdout())
};
execute!(tty_output, EnterAlternateScreen, EnableMouseCapture)?;
// Enable keyboard enhancement for better modifier key detection (e.g., Alt+Enter)
// This is supported by modern terminals like Kitty, iTerm2, WezTerm, etc.
if keyboard_enhancement_supported {
let _ = execute!(
tty_output,
PushKeyboardEnhancementFlags(KeyboardEnhancementFlags::DISAMBIGUATE_ESCAPE_CODES)
);
}
let backend = CrosstermBackend::new(tty_output);
let mut terminal = Terminal::new(backend)?;
// Track pending z command for zz centering
let mut pending_z = false;
// Track pending d command for dd delete
let mut pending_d = false;
// Track pending ; command for ;e toggle file list
let mut pending_semicolon = false;
// Track pending Ctrl+C for "press twice to exit" (with timestamp for 2s timeout)
let mut pending_ctrl_c: Option<Instant> = None;
// Main loop
loop {
// Render
terminal.draw(|frame| {
ui::render(frame, &mut app);
})?;
// Check for update result (non-blocking)
if let Some(ref rx) = update_rx
&& let Ok(
update::UpdateCheckResult::UpdateAvailable(info)
| update::UpdateCheckResult::AheadOfRelease(info),
) = rx.try_recv()
{
app.update_info = Some(info);
}
// Auto-clear expired pending Ctrl+C state and message
if let Some(first_press) = pending_ctrl_c
&& first_press.elapsed() >= CTRL_C_EXIT_TIMEOUT
{
pending_ctrl_c = None;
app.message = None;
}
// Handle events
if event::poll(Duration::from_millis(100))? {
let event = event::read()?;
match event {
Event::Key(key) if key.kind == KeyEventKind::Press => {
// Handle Ctrl+C twice to exit (works across all input modes)
// In Comment mode, first Ctrl+C also cancels the comment
if key.code == crossterm::event::KeyCode::Char('c')
&& key
.modifiers
.contains(crossterm::event::KeyModifiers::CONTROL)
{
// If in comment mode, cancel the comment first
if app.input_mode == InputMode::Comment {
app.exit_comment_mode();
}
if let Some(first_press) = pending_ctrl_c
&& first_press.elapsed() < CTRL_C_EXIT_TIMEOUT
{
// Second Ctrl+C within timeout - exit immediately
app.should_quit = true;
continue;
}
// First Ctrl+C (or timeout expired) - show warning and start timer
pending_ctrl_c = Some(Instant::now());
app.set_message("Press Ctrl+C again to exit");
continue;
}
// Any other key clears the pending Ctrl+C state and message
if pending_ctrl_c.is_some() {
pending_ctrl_c = None;
app.message = None;
}
// Handle pending z command for zz centering
if pending_z {
pending_z = false;
if key.code == crossterm::event::KeyCode::Char('z') {
app.center_cursor();
continue;
}
// Otherwise fall through to normal handling
}
// Handle pending d command for dd delete comment
if pending_d {
pending_d = false;
if key.code == crossterm::event::KeyCode::Char('d') {
if !app.delete_comment_at_cursor() {
app.set_message("No comment at cursor");
}
continue;
}
// Otherwise fall through to normal handling
}
// Handle pending ; command for ;e toggle file list, ;h/;l panel focus
if pending_semicolon {
pending_semicolon = false;
match key.code {
crossterm::event::KeyCode::Char('e') => {
app.toggle_file_list();
continue;
}
crossterm::event::KeyCode::Char('h') => {
app.focused_panel = app::FocusedPanel::FileList;
continue;
}
crossterm::event::KeyCode::Char('l') => {
app.focused_panel = app::FocusedPanel::Diff;
continue;
}
_ => {}
}
// Otherwise fall through to normal handling
}
let action = map_key_to_action(key, app.input_mode);
// Handle pending command setters (these work in any mode)
match action {
Action::PendingZCommand => {
pending_z = true;
continue;
}
Action::PendingDCommand => {
pending_d = true;
continue;
}
Action::PendingSemicolonCommand => {
pending_semicolon = true;
continue;
}
_ => {}
}
// Dispatch by input mode
match app.input_mode {
InputMode::Help => handle_help_action(&mut app, action),
InputMode::Command => handle_command_action(&mut app, action),
InputMode::Search => handle_search_action(&mut app, action),
InputMode::Comment => handle_comment_action(&mut app, action),
InputMode::Confirm => handle_confirm_action(&mut app, action),
InputMode::CommitSelect => handle_commit_select_action(&mut app, action),
InputMode::VisualSelect => handle_visual_action(&mut app, action),
InputMode::Normal => match app.focused_panel {
FocusedPanel::FileList => handle_file_list_action(&mut app, action),
FocusedPanel::Diff => handle_diff_action(&mut app, action),
},
}
}
Event::Mouse(mouse_event) => {
use crossterm::event::MouseEventKind;
// Helper to determine which panel the mouse is over
let mouse_col = mouse_event.column;
let mouse_row = mouse_event.row;
let over_file_list = app
.file_list_area
.map(|area| {
mouse_col >= area.x
&& mouse_col < area.x + area.width
&& mouse_row >= area.y
&& mouse_row < area.y + area.height
})
.unwrap_or(false);
let over_diff = app
.diff_area
.map(|area| {
mouse_col >= area.x
&& mouse_col < area.x + area.width
&& mouse_row >= area.y
&& mouse_row < area.y + area.height
})
.unwrap_or(false);
match mouse_event.kind {
MouseEventKind::Down(crossterm::event::MouseButton::Left) => {
// Click to focus panel
if app.input_mode == InputMode::Normal {
if over_file_list {
app.focused_panel = FocusedPanel::FileList;
} else if over_diff {
app.focused_panel = FocusedPanel::Diff;
}
}
}
MouseEventKind::ScrollUp | MouseEventKind::ScrollDown => {
let action = match mouse_event.kind {
MouseEventKind::ScrollUp => Action::MouseScrollUp(3),
MouseEventKind::ScrollDown => Action::MouseScrollDown(3),
_ => unreachable!(),
};
// Dispatch action based on which panel the mouse is over
match app.input_mode {
InputMode::Help => handle_help_action(&mut app, action),
InputMode::Normal => {
if over_file_list {
handle_file_list_action(&mut app, action);
} else if over_diff {
handle_diff_action(&mut app, action);
}
}
_ => {}
}
}
_ => {}
}
}
_ => {}
}
}
if app.should_quit {
break;
}
}
// Restore terminal
let _ = execute!(terminal.backend_mut(), PopKeyboardEnhancementFlags);
execute!(terminal.backend_mut(), DisableMouseCapture)?;
disable_raw_mode()?;
execute!(terminal.backend_mut(), LeaveAlternateScreen)?;
// Print pending stdout output if --stdout was used
if let Some(output) = app.pending_stdout_output {
print!("{output}");
}
Ok(())
}