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use crate::compositor::{Component, Compositor, Context, EventResult};
use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
use helix_core::Position;
use helix_view::{Editor, Theme};
use std::{borrow::Cow, ops::RangeFrom};
pub type Completion = (RangeFrom<usize>, Cow<'static, str>);
pub struct Prompt {
prompt: String,
pub line: String,
cursor: usize,
completion: Vec<Completion>,
completion_selection_index: Option<usize>,
completion_fn: Box<dyn FnMut(&str) -> Vec<Completion>>,
callback_fn: Box<dyn FnMut(&mut Editor, &str, PromptEvent)>,
}
#[derive(PartialEq)]
pub enum PromptEvent {
/// The prompt input has been updated.
Update,
/// Validate and finalize the change.
Validate,
/// Abort the change, reverting to the initial state.
Abort,
}
impl Prompt {
pub fn new(
prompt: String,
mut completion_fn: impl FnMut(&str) -> Vec<Completion> + 'static,
callback_fn: impl FnMut(&mut Editor, &str, PromptEvent) + 'static,
) -> Prompt {
Prompt {
prompt,
line: String::new(),
cursor: 0,
completion: completion_fn(""),
completion_selection_index: None,
completion_fn: Box::new(completion_fn),
callback_fn: Box::new(callback_fn),
}
}
pub fn insert_char(&mut self, c: char) {
self.line.insert(self.cursor, c);
self.cursor += 1;
self.completion = (self.completion_fn)(&self.line);
self.exit_selection();
}
pub fn move_char_left(&mut self) {
self.cursor = self.cursor.saturating_sub(1)
}
pub fn move_char_right(&mut self) {
if self.cursor < self.line.len() {
self.cursor += 1;
}
}
pub fn move_start(&mut self) {
self.cursor = 0;
}
pub fn move_end(&mut self) {
self.cursor = self.line.len();
}
pub fn delete_char_backwards(&mut self) {
if self.cursor > 0 {
self.line.remove(self.cursor - 1);
self.cursor -= 1;
self.completion = (self.completion_fn)(&self.line);
}
self.exit_selection();
}
pub fn change_completion_selection(&mut self) {
if self.completion.is_empty() {
return;
}
let index = self.completion_selection_index.map_or(0, |i| i + 1) % self.completion.len();
self.completion_selection_index = Some(index);
let (range, item) = &self.completion[index];
self.line.replace_range(range.clone(), item);
self.move_end();
// TODO: recalculate completion when completion item is accepted, (Enter)
}
pub fn exit_selection(&mut self) {
self.completion_selection_index = None;
}
}
use tui::{
buffer::Buffer as Surface,
layout::Rect,
style::{Color, Modifier, Style},
};
const BASE_WIDTH: u16 = 30;
use crate::ui::text_color;
impl Prompt {
pub fn render_prompt(&self, area: Rect, surface: &mut Surface, theme: &Theme) {
let text_color = text_color();
// completion
if !self.completion.is_empty() {
// TODO: find out better way of clearing individual lines of the screen
let mut row = 0;
let mut col = 0;
let max_col = area.width / BASE_WIDTH;
let col_height = ((self.completion.len() as u16 + max_col - 1) / max_col);
for i in (3..col_height + 3) {
surface.set_string(
0,
area.height - i as u16,
" ".repeat(area.width as usize),
text_color,
);
}
surface.set_style(
Rect::new(0, area.height - col_height - 2, area.width, col_height),
theme.get("ui.statusline"),
);
for (i, (_range, completion)) in self.completion.iter().enumerate() {
let color = if Some(i) == self.completion_selection_index {
Style::default().bg(Color::Rgb(104, 60, 232))
} else {
text_color
};
surface.set_stringn(
1 + col * BASE_WIDTH,
area.height - col_height - 2 + row,
&completion,
BASE_WIDTH as usize - 1,
color,
);
row += 1;
if row > col_height - 1 {
row = 0;
col += 1;
}
if col > max_col {
break;
}
}
}
let line = area.height - 1;
// render buffer text
surface.set_string(area.x, area.y + line, &self.prompt, text_color);
surface.set_string(
area.x + self.prompt.len() as u16,
area.y + line,
&self.line,
text_color,
);
}
}
impl Component for Prompt {
fn handle_event(&mut self, event: Event, cx: &mut Context) -> EventResult {
let event = match event {
Event::Key(event) => event,
Event::Resize(..) => return EventResult::Consumed(None),
_ => return EventResult::Ignored,
};
let close_fn = EventResult::Consumed(Some(Box::new(
|compositor: &mut Compositor, editor: &mut Editor| {
// remove the layer
compositor.pop();
},
)));
match event {
// char or shift char
KeyEvent {
code: KeyCode::Char(c),
modifiers: KeyModifiers::NONE | KeyModifiers::SHIFT,
} => {
self.insert_char(c);
(self.callback_fn)(cx.editor, &self.line, PromptEvent::Update);
}
KeyEvent {
code: KeyCode::Esc, ..
} => {
(self.callback_fn)(cx.editor, &self.line, PromptEvent::Abort);
return close_fn;
}
KeyEvent {
code: KeyCode::Right,
..
} => self.move_char_right(),
KeyEvent {
code: KeyCode::Left,
..
} => self.move_char_left(),
KeyEvent {
code: KeyCode::Char('e'),
modifiers: KeyModifiers::CONTROL,
} => self.move_end(),
KeyEvent {
code: KeyCode::Char('a'),
modifiers: KeyModifiers::CONTROL,
} => self.move_start(),
KeyEvent {
code: KeyCode::Backspace,
modifiers: KeyModifiers::NONE,
} => {
self.delete_char_backwards();
(self.callback_fn)(cx.editor, &self.line, PromptEvent::Update);
}
KeyEvent {
code: KeyCode::Enter,
..
} => {
(self.callback_fn)(cx.editor, &self.line, PromptEvent::Validate);
return close_fn;
}
KeyEvent {
code: KeyCode::Tab, ..
} => self.change_completion_selection(),
KeyEvent {
code: KeyCode::Char('q'),
modifiers: KeyModifiers::CONTROL,
} => self.exit_selection(),
_ => (),
};
EventResult::Consumed(None)
}
fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) {
self.render_prompt(area, surface, &cx.editor.theme)
}
fn cursor_position(&self, area: Rect, editor: &Editor) -> Option<Position> {
Some(Position::new(
area.height as usize,
area.x as usize + self.prompt.len() + self.cursor,
))
}
}
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