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picker.rs
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picker.rs
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use crate::{
compositor::{Component, Compositor, Context, EventResult},
ctrl, key, shift,
ui::EditorView,
};
use crossterm::event::Event;
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::{
borrow::Cow,
collections::HashMap,
io::Read,
path::{Path, PathBuf},
};
use crate::ui::{Prompt, PromptEvent};
use helix_core::Position;
use helix_view::{
editor::Action,
graphics::{Color, CursorKind, Margin, Rect, Style},
Document, Editor,
};
pub const MIN_SCREEN_WIDTH_FOR_PREVIEW: u16 = 80;
/// 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)
type FileLocation = (PathBuf, Option<(usize, usize)>);
pub struct FilePicker<T> {
picker: Picker<T>,
pub truncate_start: bool,
/// Caches paths to documents
preview_cache: HashMap<PathBuf, CachedPreview>,
read_buffer: Vec<u8>,
/// Given an item in the picker, return the file path and line number to display.
file_fn: Box<dyn Fn(&Editor, &T) -> Option<FileLocation>>,
}
pub enum CachedPreview {
Document(Box<Document>),
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(_) => "<File preview>",
Self::Cached(preview) => match preview {
CachedPreview::Document(_) => "<File preview>",
CachedPreview::Binary => "<Binary file>",
CachedPreview::LargeFile => "<File too large to preview>",
CachedPreview::NotFound => "<File not found>",
},
}
}
}
impl<T> FilePicker<T> {
pub fn new(
options: Vec<T>,
format_fn: impl Fn(&T) -> Cow<str> + 'static,
callback_fn: impl Fn(&mut Editor, &T, Action) + 'static,
preview_fn: impl Fn(&Editor, &T) -> Option<FileLocation> + 'static,
) -> Self {
Self {
picker: Picker::new(false, options, format_fn, callback_fn),
truncate_start: true,
preview_cache: HashMap::new(),
read_buffer: Vec::with_capacity(1024),
file_fn: Box::new(preview_fn),
}
}
fn current_file(&self, editor: &Editor) -> Option<FileLocation> {
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, Some(&editor.theme), 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<T: 'static> Component for FilePicker<T> {
fn render(&mut self, area: Rect, surface: &mut Surface, cx: &mut Context) {
// +---------+ +---------+
// |prompt | |preview |
// +---------+ | |
// |picker | | |
// | | | |
// +---------+ +---------+
let render_preview = area.width > MIN_SCREEN_WIDTH_FOR_PREVIEW;
let area = inner_rect(area);
// -- 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.truncate_start = self.truncate_start;
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 {
vertical: 0,
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,
&cx.editor.syn_loader,
);
EditorView::render_text_highlights(
doc,
offset,
inner,
surface,
&cx.editor.theme,
highlights,
);
// 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<Position>, CursorKind) {
self.picker.cursor(area, ctx)
}
}
pub struct Picker<T> {
options: Vec<T>,
// filter: String,
matcher: Box<Matcher>,
/// (index, score)
matches: Vec<(usize, i64)>,
/// Filter over original options.
filters: Vec<usize>, // could be optimized into bit but not worth it now
cursor: usize,
// pattern: String,
prompt: Prompt,
/// Whether to render in the middle of the area
render_centered: bool,
/// Wheather to truncate the start (default true)
pub truncate_start: bool,
format_fn: Box<dyn Fn(&T) -> Cow<str>>,
callback_fn: Box<dyn Fn(&mut Editor, &T, Action)>,
}
impl<T> Picker<T> {
pub fn new(
render_centered: bool,
options: Vec<T>,
format_fn: impl Fn(&T) -> Cow<str> + 'static,
callback_fn: impl Fn(&mut Editor, &T, Action) + 'static,
) -> Self {
let prompt = Prompt::new(
"".into(),
None,
|_pattern: &str| Vec::new(),
|_editor: &mut Context, _pattern: &str, _event: PromptEvent| {
//
},
);
let mut picker = Self {
options,
matcher: Box::new(Matcher::default()),
matches: Vec::new(),
filters: Vec::new(),
cursor: 0,
prompt,
render_centered,
truncate_start: true,
format_fn: Box::new(format_fn),
callback_fn: Box::new(callback_fn),
};
// TODO: scoring on empty input should just use a fastpath
picker.score();
picker
}
pub fn score(&mut self) {
let pattern = &self.prompt.line;
// reuse the matches allocation
self.matches.clear();
self.matches.extend(
self.options
.iter()
.enumerate()
.filter_map(|(index, option)| {
// filter options first before matching
if !self.filters.is_empty() {
self.filters.binary_search(&index).ok()?;
}
// TODO: maybe using format_fn isn't the best idea here
let text = (self.format_fn)(option);
// TODO: using fuzzy_indices could give us the char idx for match highlighting
self.matcher
.fuzzy_match(&text, pattern)
.map(|score| (index, score))
}),
);
self.matches.sort_unstable_by_key(|(_, score)| -score);
// reset cursor position
self.cursor = 0;
}
pub fn move_up(&mut self) {
if self.matches.is_empty() {
return;
}
let len = self.matches.len();
let pos = ((self.cursor + len.saturating_sub(1)) % len) % len;
self.cursor = pos;
}
pub fn move_down(&mut self) {
if self.matches.is_empty() {
return;
}
let len = self.matches.len();
let pos = (self.cursor + 1) % len;
self.cursor = pos;
}
pub fn selection(&self) -> Option<&T> {
self.matches
.get(self.cursor)
.map(|(index, _score)| &self.options[*index])
}
pub fn save_filter(&mut self) {
self.filters.clear();
self.filters
.extend(self.matches.iter().map(|(index, _)| *index));
self.filters.sort_unstable(); // used for binary search later
self.prompt.clear();
}
}
// 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
fn inner_rect(area: Rect) -> Rect {
let margin = Margin {
vertical: area.height * 10 / 100,
horizontal: area.width * 10 / 100,
};
area.inner(&margin)
}
impl<T: 'static> Component for Picker<T> {
fn handle_event(&mut self, event: Event, cx: &mut Context) -> EventResult {
let key_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, _| {
// remove the layer
compositor.last_picker = compositor.pop();
})));
match key_event.into() {
shift!(Tab) | key!(Up) | ctrl!('p') | ctrl!('k') => {
self.move_up();
}
key!(Tab) | key!(Down) | ctrl!('n') | ctrl!('j') => {
self.move_down();
}
key!(Esc) | ctrl!('c') => {
return close_fn;
}
key!(Enter) => {
if let Some(option) = self.selection() {
(self.callback_fn)(cx.editor, option, Action::Replace);
}
return close_fn;
}
ctrl!('s') => {
if let Some(option) = self.selection() {
(self.callback_fn)(cx.editor, option, Action::HorizontalSplit);
}
return close_fn;
}
ctrl!('v') => {
if let Some(option) = self.selection() {
(self.callback_fn)(cx.editor, option, Action::VerticalSplit);
}
return close_fn;
}
ctrl!(' ') => {
self.save_filter();
}
_ => {
if let EventResult::Consumed(_) = self.prompt.handle_event(event, cx) {
// TODO: recalculate only if pattern changed
self.score();
}
}
}
EventResult::Consumed(None)
}
fn render(&mut self, area: Rect, surface: &mut Surface, cx: &mut Context) {
let area = if self.render_centered {
inner_rect(area)
} else {
area
};
let text_style = cx.editor.theme.get("ui.text");
// -- 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 = Style::default().fg(Color::Rgb(90, 89, 119));
let borders = BorderType::line_symbols(BorderType::Plain);
for x in inner.left()..inner.right() {
surface
.get_mut(x, inner.y + 1)
.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 selected = cx.editor.theme.get("ui.text.focus");
let rows = inner.height;
let offset = self.cursor / (rows as usize) * (rows as usize);
let files = self.matches.iter().skip(offset).map(|(index, _score)| {
(index, self.options.get(*index).unwrap()) // get_unchecked
});
for (i, (_index, option)) in files.take(rows as usize).enumerate() {
if i == (self.cursor - offset) {
surface.set_string(inner.x - 2, inner.y + i as u16, ">", selected);
}
surface.set_string_truncated(
inner.x,
inner.y + i as u16,
(self.format_fn)(option),
inner.width as usize,
if i == (self.cursor - offset) {
selected
} else {
text_style
},
true,
self.truncate_start,
);
}
}
fn cursor(&self, area: Rect, editor: &Editor) -> (Option<Position>, CursorKind) {
// TODO: this is mostly duplicate code
let area = inner_rect(area);
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)
}
}