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use anyhow::Result;
use crossterm::{
cursor::SetCursorStyle,
event::{self, Event, KeyCode, KeyModifiers},
execute,
};
use hjkl_engine::{CursorShape, Host, VimMode};
use ratatui::{Terminal, backend::CrosstermBackend};
use std::io::Stdout;
use std::time::Duration;
use super::{App, STATUS_LINE_HEIGHT, SearchDir, prompt_cursor_shape};
use crate::render;
impl App {
/// Main event loop. Draws every frame, routes key events through
/// the vim FSM, handles resize, exits on Ctrl-C.
pub fn run(&mut self, terminal: &mut Terminal<CrosstermBackend<Stdout>>) -> Result<()> {
loop {
// Update host viewport dimensions from the current terminal size.
{
let size = terminal.size()?;
let vp = self.active_mut().editor.host_mut().viewport_mut();
vp.width = size.width;
vp.height = size.height.saturating_sub(STATUS_LINE_HEIGHT);
}
// Emit cursor shape before the draw call, once per transition.
let current_shape = if let Some(ref f) = self.command_field {
prompt_cursor_shape(f)
} else if let Some(ref f) = self.search_field {
prompt_cursor_shape(f)
} else {
self.active().editor.host().cursor_shape()
};
if current_shape != self.last_cursor_shape {
match current_shape {
CursorShape::Block => {
let _ = execute!(terminal.backend_mut(), SetCursorStyle::SteadyBlock);
}
CursorShape::Bar => {
let _ = execute!(terminal.backend_mut(), SetCursorStyle::SteadyBar);
}
CursorShape::Underline => {
let _ = execute!(terminal.backend_mut(), SetCursorStyle::SteadyUnderScore);
}
}
self.last_cursor_shape = current_shape;
}
// Draw the current frame.
terminal.draw(|frame| render::frame(frame, self))?;
// Wait for the next event with a 120 ms ceiling.
if !event::poll(Duration::from_millis(120))? {
continue;
}
match event::read()? {
Event::Key(key) => {
if key.code == KeyCode::Char('c')
&& key.modifiers.contains(KeyModifiers::CONTROL)
{
if self.command_field.is_some() {
self.command_field = None;
continue;
}
if self.search_field.is_some() {
self.cancel_search_prompt();
continue;
}
break;
}
self.status_message = None;
// ── Info popup dismissal ──────────────────────────────────
if self.info_popup.is_some() {
self.info_popup = None;
continue;
}
// ── Command palette (`:` prompt) ─────────────────────────
if self.command_field.is_some() {
self.handle_command_field_key(key);
if self.exit_requested {
break;
}
continue;
}
// ── Search prompt (`/` `?`) ──────────────────────────────
if self.search_field.is_some() {
self.handle_search_field_key(key);
if self.exit_requested {
break;
}
continue;
}
// ── Picker overlay ────────────────────────────────────────
if self.picker.is_some() {
self.handle_picker_key(key);
if self.exit_requested {
break;
}
continue;
}
// ── Leader resolution ────────────────────────────────────
if self.pending_leader && self.active().editor.vim_mode() == VimMode::Normal {
self.pending_leader = false;
if key.modifiers == KeyModifiers::NONE {
match key.code {
KeyCode::Char(' ') | KeyCode::Char('f') => {
self.open_picker();
}
KeyCode::Char('b') => {
self.open_buffer_picker();
}
KeyCode::Char('/') => {
self.open_grep_picker(None);
}
_ => {}
}
}
continue;
}
// ── Leader prefix ────────────────────────────────────────
if key.code == KeyCode::Char(' ')
&& key.modifiers == KeyModifiers::NONE
&& self.active().editor.vim_mode() == VimMode::Normal
{
self.pending_leader = true;
continue;
}
// ── Alt-buffer toggle (Ctrl-^ / Ctrl-6) ─────────────────
if self.active().editor.vim_mode() == VimMode::Normal
&& key.modifiers.contains(KeyModifiers::CONTROL)
&& (key.code == KeyCode::Char('^') || key.code == KeyCode::Char('6'))
{
self.buffer_alt();
continue;
}
// ── Shift-H / Shift-L cycle buffers ──────────────────────
// Only when more than one buffer is open; with a single
// slot fall through to the engine's H/L viewport motions.
if self.active().editor.vim_mode() == VimMode::Normal
&& self.slots.len() > 1
&& (key.modifiers == KeyModifiers::SHIFT
|| key.modifiers == KeyModifiers::NONE)
{
if key.code == KeyCode::Char('H') {
self.buffer_prev();
continue;
}
if key.code == KeyCode::Char('L') {
self.buffer_next();
continue;
}
}
// ── Buffer-motion pending state ──────────────────────────
if self.active().editor.vim_mode() == VimMode::Normal
&& key.modifiers == KeyModifiers::NONE
{
if let Some(prefix) = self.pending_buffer_motion.take() {
match (prefix, key.code) {
('g', KeyCode::Char('t')) => {
self.buffer_next();
continue;
}
('g', KeyCode::Char('T')) => {
self.buffer_prev();
continue;
}
(']', KeyCode::Char('b')) => {
self.buffer_next();
continue;
}
('[', KeyCode::Char('b')) => {
self.buffer_prev();
continue;
}
// Didn't match — forward only the current key;
// drop the pending prefix (g/]/[ alone has no
// other mapped meaning in our engine yet).
_ => {
self.active_mut().editor.handle_key(key);
continue;
}
}
}
} else {
// Any non-Normal key clears the pending motion.
self.pending_buffer_motion = None;
}
// ── Intercept `:` in Normal mode ─────────────────────────
if key.code == KeyCode::Char(':')
&& key.modifiers == KeyModifiers::NONE
&& self.active().editor.vim_mode() == VimMode::Normal
{
self.open_command_prompt();
continue;
}
// ── Intercept `/` and `?` in Normal mode ─────────────────
if key.modifiers == KeyModifiers::NONE
&& self.active().editor.vim_mode() == VimMode::Normal
{
if key.code == KeyCode::Char('/') {
self.open_search_prompt(SearchDir::Forward);
continue;
}
if key.code == KeyCode::Char('?') {
self.open_search_prompt(SearchDir::Backward);
continue;
}
}
// ── Set pending buffer-motion prefix ─────────────────────
if self.active().editor.vim_mode() == VimMode::Normal
&& key.modifiers == KeyModifiers::NONE
&& matches!(
key.code,
KeyCode::Char('g') | KeyCode::Char(']') | KeyCode::Char('[')
)
&& let KeyCode::Char(c) = key.code
{
self.pending_buffer_motion = Some(c);
// Fall through: also forward the key to the engine
// so its own `g`-pending state is updated correctly
// (the engine handles gj/gk/gg/G etc).
}
// ── Normal editor key handling ───────────────────────────
self.active_mut().editor.handle_key(key);
// Drain dirty for the persistent UI flag.
if self.active_mut().editor.take_dirty() {
let elapsed = self.active_mut().refresh_dirty_against_saved();
self.last_signature_us = elapsed;
if self.active().dirty {
self.active_mut().is_new_file = false;
}
}
// Fan engine ContentEdits into the syntax tree.
let buffer_id = self.active().buffer_id;
if self.active_mut().editor.take_content_reset() {
self.syntax.reset(buffer_id);
}
let edits = self.active_mut().editor.take_content_edits();
if !edits.is_empty() {
self.syntax.apply_edits(buffer_id, &edits);
}
self.recompute_and_install();
}
Event::Resize(w, h) => {
let vp = self.active_mut().editor.host_mut().viewport_mut();
vp.width = w;
vp.height = h.saturating_sub(STATUS_LINE_HEIGHT);
}
_ => {}
}
if self.exit_requested {
break;
}
}
Ok(())
}
}