use crate::compositor::{Component, Compositor, Context, EventResult}; use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers}; use helix_core::Position; use helix_view::Editor; use helix_view::Theme; use std::string::String; pub struct Prompt { pub prompt: String, pub line: String, pub cursor: usize, pub completion: Vec, pub completion_selection_index: Option, completion_fn: Box Vec>, callback_fn: Box, } #[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 + '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(|i| i + 1).unwrap_or(0) % self.completion.len(); self.completion_selection_index = Some(index); self.line = self.completion[index].clone(); } 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, command) in self.completion.iter().enumerate() { let color = if self.completion_selection_index.is_some() && i == self.completion_selection_index.unwrap() { Style::default().bg(Color::Rgb(104, 60, 232)) } else { text_color }; surface.set_stringn( 1 + col * BASE_WIDTH, area.height - col_height - 2 + row, &command, 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 { KeyEvent { code: KeyCode::Char(c), modifiers: KeyModifiers::NONE, } => { 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, ctx: &mut Context) -> Option { Some(Position::new( area.height as usize, area.x as usize + self.prompt.len() + self.cursor, )) } }