use crate::{ compositor::{Component, Compositor, Context, Event, EventResult}, ctrl, key, shift, ui::{self, EditorView}, }; use tui::{ buffer::Buffer as Surface, widgets::{Block, BorderType, Borders}, }; use fuzzy_matcher::skim::SkimMatcherV2 as Matcher; use fuzzy_matcher::FuzzyMatcher; use tui::widgets::Widget; use std::time::Instant; use std::{ cmp::Reverse, collections::HashMap, io::Read, path::{Path, PathBuf}, }; use crate::ui::{Prompt, PromptEvent}; use helix_core::{movement::Direction, Position}; use helix_view::{ editor::Action, graphics::{CursorKind, Margin, Modifier, Rect}, Document, Editor, }; use super::menu::Item; pub const MIN_AREA_WIDTH_FOR_PREVIEW: u16 = 72; /// Biggest file size to preview in bytes pub const MAX_FILE_SIZE_FOR_PREVIEW: u64 = 10 * 1024 * 1024; /// File path and range of lines (used to align and highlight lines) pub type FileLocation = (PathBuf, Option<(usize, usize)>); pub struct FilePicker { picker: Picker, pub truncate_start: bool, /// Caches paths to documents preview_cache: HashMap, read_buffer: Vec, /// Given an item in the picker, return the file path and line number to display. file_fn: Box Option>, } pub enum CachedPreview { Document(Box), Binary, LargeFile, NotFound, } // We don't store this enum in the cache so as to avoid lifetime constraints // from borrowing a document already opened in the editor. pub enum Preview<'picker, 'editor> { Cached(&'picker CachedPreview), EditorDocument(&'editor Document), } impl Preview<'_, '_> { fn document(&self) -> Option<&Document> { match self { Preview::EditorDocument(doc) => Some(doc), Preview::Cached(CachedPreview::Document(doc)) => Some(doc), _ => None, } } /// Alternate text to show for the preview. fn placeholder(&self) -> &str { match *self { Self::EditorDocument(_) => "", Self::Cached(preview) => match preview { CachedPreview::Document(_) => "", CachedPreview::Binary => "", CachedPreview::LargeFile => "", CachedPreview::NotFound => "", }, } } } impl FilePicker { pub fn new( options: Vec, editor_data: T::Data, callback_fn: impl Fn(&mut Context, &T, Action) + 'static, preview_fn: impl Fn(&Editor, &T) -> Option + 'static, ) -> Self { let truncate_start = true; let mut picker = Picker::new(options, editor_data, callback_fn); picker.truncate_start = truncate_start; Self { picker, truncate_start, preview_cache: HashMap::new(), read_buffer: Vec::with_capacity(1024), file_fn: Box::new(preview_fn), } } pub fn truncate_start(mut self, truncate_start: bool) -> Self { self.truncate_start = truncate_start; self.picker.truncate_start = truncate_start; self } fn current_file(&self, editor: &Editor) -> Option { self.picker .selection() .and_then(|current| (self.file_fn)(editor, current)) .and_then(|(path, line)| { helix_core::path::get_canonicalized_path(&path) .ok() .zip(Some(line)) }) } /// Get (cached) preview for a given path. If a document corresponding /// to the path is already open in the editor, it is used instead. fn get_preview<'picker, 'editor>( &'picker mut self, path: &Path, editor: &'editor Editor, ) -> Preview<'picker, 'editor> { if let Some(doc) = editor.document_by_path(path) { return Preview::EditorDocument(doc); } if self.preview_cache.contains_key(path) { return Preview::Cached(&self.preview_cache[path]); } let data = std::fs::File::open(path).and_then(|file| { let metadata = file.metadata()?; // Read up to 1kb to detect the content type let n = file.take(1024).read_to_end(&mut self.read_buffer)?; let content_type = content_inspector::inspect(&self.read_buffer[..n]); self.read_buffer.clear(); Ok((metadata, content_type)) }); let preview = data .map( |(metadata, content_type)| match (metadata.len(), content_type) { (_, content_inspector::ContentType::BINARY) => CachedPreview::Binary, (size, _) if size > MAX_FILE_SIZE_FOR_PREVIEW => CachedPreview::LargeFile, _ => { // TODO: enable syntax highlighting; blocked by async rendering Document::open(path, None, None) .map(|doc| CachedPreview::Document(Box::new(doc))) .unwrap_or(CachedPreview::NotFound) } }, ) .unwrap_or(CachedPreview::NotFound); self.preview_cache.insert(path.to_owned(), preview); Preview::Cached(&self.preview_cache[path]) } } impl Component for FilePicker { fn render(&mut self, area: Rect, surface: &mut Surface, cx: &mut Context) { // +---------+ +---------+ // |prompt | |preview | // +---------+ | | // |picker | | | // | | | | // +---------+ +---------+ let render_preview = self.picker.show_preview && area.width > MIN_AREA_WIDTH_FOR_PREVIEW; // -- Render the frame: // clear area let background = cx.editor.theme.get("ui.background"); let text = cx.editor.theme.get("ui.text"); surface.clear_with(area, background); let picker_width = if render_preview { area.width / 2 } else { area.width }; let picker_area = area.with_width(picker_width); self.picker.render(picker_area, surface, cx); if !render_preview { return; } let preview_area = area.clip_left(picker_width); // don't like this but the lifetime sucks let block = Block::default().borders(Borders::ALL); // calculate the inner area inside the box let inner = block.inner(preview_area); // 1 column gap on either side let margin = Margin::horizontal(1); let inner = inner.inner(&margin); block.render(preview_area, surface); if let Some((path, range)) = self.current_file(cx.editor) { let preview = self.get_preview(&path, cx.editor); let doc = match preview.document() { Some(doc) => doc, None => { let alt_text = preview.placeholder(); let x = inner.x + inner.width.saturating_sub(alt_text.len() as u16) / 2; let y = inner.y + inner.height / 2; surface.set_stringn(x, y, alt_text, inner.width as usize, text); return; } }; // align to middle let first_line = range .map(|(start, end)| { let height = end.saturating_sub(start) + 1; let middle = start + (height.saturating_sub(1) / 2); middle.saturating_sub(inner.height as usize / 2).min(start) }) .unwrap_or(0); let offset = Position::new(first_line, 0); let highlights = EditorView::doc_syntax_highlights(doc, offset, area.height, &cx.editor.theme); EditorView::render_text_highlights( doc, offset, inner, surface, &cx.editor.theme, highlights, &cx.editor.config(), ); // highlight the line if let Some((start, end)) = range { let offset = start.saturating_sub(first_line) as u16; surface.set_style( Rect::new( inner.x, inner.y + offset, inner.width, (end.saturating_sub(start) as u16 + 1) .min(inner.height.saturating_sub(offset)), ), cx.editor .theme .try_get("ui.highlight") .unwrap_or_else(|| cx.editor.theme.get("ui.selection")), ); } } } fn handle_event(&mut self, event: &Event, ctx: &mut Context) -> EventResult { // TODO: keybinds for scrolling preview self.picker.handle_event(event, ctx) } fn cursor(&self, area: Rect, ctx: &Editor) -> (Option, CursorKind) { self.picker.cursor(area, ctx) } fn required_size(&mut self, (width, height): (u16, u16)) -> Option<(u16, u16)> { let picker_width = if width > MIN_AREA_WIDTH_FOR_PREVIEW { width / 2 } else { width }; self.picker.required_size((picker_width, height))?; Some((width, height)) } } pub struct Picker { options: Vec, editor_data: T::Data, // filter: String, matcher: Box, /// (index, score) matches: Vec<(usize, i64)>, /// Filter over original options. filters: Vec, // could be optimized into bit but not worth it now /// Current height of the completions box completion_height: u16, cursor: usize, // pattern: String, prompt: Prompt, previous_pattern: String, /// Whether to truncate the start (default true) pub truncate_start: bool, /// Whether to show the preview panel (default true) show_preview: bool, callback_fn: Box, } impl Picker { pub fn new( options: Vec, editor_data: T::Data, callback_fn: impl Fn(&mut Context, &T, Action) + 'static, ) -> Self { let prompt = Prompt::new( "".into(), None, ui::completers::none, |_editor: &mut Context, _pattern: &str, _event: PromptEvent| {}, ); let mut picker = Self { options, editor_data, matcher: Box::new(Matcher::default()), matches: Vec::new(), filters: Vec::new(), cursor: 0, prompt, previous_pattern: String::new(), truncate_start: true, show_preview: true, callback_fn: Box::new(callback_fn), completion_height: 0, }; // scoring on empty input: // TODO: just reuse score() picker.matches.extend( picker .options .iter() .enumerate() .map(|(index, _option)| (index, 0)), ); picker } pub fn score(&mut self) { let now = Instant::now(); let pattern = self.prompt.line(); if pattern == &self.previous_pattern { return; } if pattern.is_empty() { // Fast path for no pattern. self.matches.clear(); self.matches.extend( self.options .iter() .enumerate() .map(|(index, _option)| (index, 0)), ); } else if pattern.starts_with(&self.previous_pattern) { // TODO: remove when retain_mut is in stable rust #[allow(unused_imports, deprecated)] use retain_mut::RetainMut; // optimization: if the pattern is a more specific version of the previous one // then we can score the filtered set. #[allow(unstable_name_collisions)] self.matches.retain_mut(|(index, score)| { let option = &self.options[*index]; let text = option.sort_text(&self.editor_data); match self.matcher.fuzzy_match(&text, pattern) { Some(s) => { // Update the score *score = s; true } None => false, } }); self.matches .sort_unstable_by_key(|(_, score)| Reverse(*score)); } else { self.matches.clear(); self.matches.extend( self.options .iter() .enumerate() .filter_map(|(index, option)| { // filter options first before matching if !self.filters.is_empty() { // TODO: this filters functionality seems inefficient, // instead store and operate on filters if any self.filters.binary_search(&index).ok()?; } let text = option.filter_text(&self.editor_data); self.matcher .fuzzy_match(&text, pattern) .map(|score| (index, score)) }), ); self.matches .sort_unstable_by_key(|(_, score)| Reverse(*score)); } log::debug!("picker score {:?}", Instant::now().duration_since(now)); // reset cursor position self.cursor = 0; self.previous_pattern.clone_from(pattern); } /// Move the cursor by a number of lines, either down (`Forward`) or up (`Backward`) pub fn move_by(&mut self, amount: usize, direction: Direction) { let len = self.matches.len(); if len == 0 { // No results, can't move. return; } match direction { Direction::Forward => { self.cursor = self.cursor.saturating_add(amount) % len; } Direction::Backward => { self.cursor = self.cursor.saturating_add(len).saturating_sub(amount) % len; } } } /// Move the cursor down by exactly one page. After the last page comes the first page. pub fn page_up(&mut self) { self.move_by(self.completion_height as usize, Direction::Backward); } /// Move the cursor up by exactly one page. After the first page comes the last page. pub fn page_down(&mut self) { self.move_by(self.completion_height as usize, Direction::Forward); } /// Move the cursor to the first entry pub fn to_start(&mut self) { self.cursor = 0; } /// Move the cursor to the last entry pub fn to_end(&mut self) { self.cursor = self.matches.len().saturating_sub(1); } pub fn selection(&self) -> Option<&T> { self.matches .get(self.cursor) .map(|(index, _score)| &self.options[*index]) } pub fn save_filter(&mut self, cx: &Context) { self.filters.clear(); self.filters .extend(self.matches.iter().map(|(index, _)| *index)); self.filters.sort_unstable(); // used for binary search later self.prompt.clear(cx.editor); } pub fn toggle_preview(&mut self) { self.show_preview = !self.show_preview; } fn prompt_handle_event(&mut self, event: &Event, cx: &mut Context) -> EventResult { if let EventResult::Consumed(_) = self.prompt.handle_event(event, cx) { // TODO: recalculate only if pattern changed self.score(); } EventResult::Consumed(None) } } // process: // - read all the files into a list, maxed out at a large value // - on input change: // - score all the names in relation to input impl Component for Picker { fn required_size(&mut self, viewport: (u16, u16)) -> Option<(u16, u16)> { self.completion_height = viewport.1.saturating_sub(4); Some(viewport) } fn handle_event(&mut self, event: &Event, cx: &mut Context) -> EventResult { let key_event = match event { Event::Key(event) => *event, Event::Paste(..) => return self.prompt_handle_event(event, cx), Event::Resize(..) => return EventResult::Consumed(None), _ => return EventResult::Ignored(None), }; let close_fn = EventResult::Consumed(Some(Box::new(|compositor: &mut Compositor, _cx| { // remove the layer compositor.last_picker = compositor.pop(); }))); match key_event { shift!(Tab) | key!(Up) | ctrl!('p') => { self.move_by(1, Direction::Backward); } key!(Tab) | key!(Down) | ctrl!('n') => { self.move_by(1, Direction::Forward); } key!(PageDown) | ctrl!('d') => { self.page_down(); } key!(PageUp) | ctrl!('u') => { self.page_up(); } key!(Home) => { self.to_start(); } key!(End) => { self.to_end(); } key!(Esc) | ctrl!('c') => { return close_fn; } key!(Enter) => { if let Some(option) = self.selection() { (self.callback_fn)(cx, option, Action::Replace); } return close_fn; } ctrl!('s') => { if let Some(option) = self.selection() { (self.callback_fn)(cx, option, Action::HorizontalSplit); } return close_fn; } ctrl!('v') => { if let Some(option) = self.selection() { (self.callback_fn)(cx, option, Action::VerticalSplit); } return close_fn; } ctrl!(' ') => { self.save_filter(cx); } ctrl!('t') => { self.toggle_preview(); } _ => { self.prompt_handle_event(event, cx); } } EventResult::Consumed(None) } fn render(&mut self, area: Rect, surface: &mut Surface, cx: &mut Context) { let text_style = cx.editor.theme.get("ui.text"); let selected = cx.editor.theme.get("ui.text.focus"); let highlighted = cx.editor.theme.get("special").add_modifier(Modifier::BOLD); // -- Render the frame: // clear area let background = cx.editor.theme.get("ui.background"); surface.clear_with(area, background); // don't like this but the lifetime sucks let block = Block::default().borders(Borders::ALL); // calculate the inner area inside the box let inner = block.inner(area); block.render(area, surface); // -- Render the input bar: let area = inner.clip_left(1).with_height(1); let count = format!("{}/{}", self.matches.len(), self.options.len()); surface.set_stringn( (area.x + area.width).saturating_sub(count.len() as u16 + 1), area.y, &count, (count.len()).min(area.width as usize), text_style, ); self.prompt.render(area, surface, cx); // -- Separator let sep_style = cx.editor.theme.get("ui.background.separator"); let borders = BorderType::line_symbols(BorderType::Plain); for x in inner.left()..inner.right() { if let Some(cell) = surface.get_mut(x, inner.y + 1) { cell.set_symbol(borders.horizontal).set_style(sep_style); } } // -- Render the contents: // subtract area of prompt from top and current item marker " > " from left let inner = inner.clip_top(2).clip_left(3); let rows = inner.height; let offset = self.cursor - (self.cursor % std::cmp::max(1, rows as usize)); let files = self .matches .iter() .skip(offset) .map(|(index, _score)| (*index, self.options.get(*index).unwrap())); for (i, (_index, option)) in files.take(rows as usize).enumerate() { let is_active = i == (self.cursor - offset); if is_active { surface.set_string( inner.x.saturating_sub(3), inner.y + i as u16, " > ", selected, ); surface.set_style( Rect::new(inner.x, inner.y + i as u16, inner.width, 1), selected, ); } let spans = option.label(&self.editor_data); let (_score, highlights) = self .matcher .fuzzy_indices(&String::from(&spans), self.prompt.line()) .unwrap_or_default(); spans.0.into_iter().fold(inner, |pos, span| { let new_x = surface .set_string_truncated( pos.x, pos.y + i as u16, &span.content, pos.width as usize, |idx| { if highlights.contains(&idx) { highlighted.patch(span.style) } else if is_active { selected.patch(span.style) } else { text_style.patch(span.style) } }, true, self.truncate_start, ) .0; pos.clip_left(new_x - pos.x) }); } } fn cursor(&self, area: Rect, editor: &Editor) -> (Option, CursorKind) { let block = Block::default().borders(Borders::ALL); // calculate the inner area inside the box let inner = block.inner(area); // prompt area let area = inner.clip_left(1).with_height(1); self.prompt.cursor(area, editor) } }