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use anyhow::{anyhow, Context, Result};
use bstr::BString;
use crosstermion::crossterm::event::KeyEventKind;
use crosstermion::input::Key;
use dua::traverse::{Tree, TreeIndex};
use petgraph::Direction;
use std::borrow::Borrow;
use tui::backend::Backend;
use tui::prelude::Buffer;
use tui::{
layout::Rect,
style::Style,
text::{Line, Span, Text},
widgets::{Block, Borders, Paragraph, Widget},
};
use tui_react::util::{block_width, rect};
use tui_react::{draw_text_nowrap_fn, Terminal};
use unicode_segmentation::UnicodeSegmentation;
use unicode_width::UnicodeWidthStr;
use crate::interactive::Cursor;
pub struct GlobPaneProps {
pub border_style: Style,
pub has_focus: bool,
}
#[derive(Default)]
pub struct GlobPane {
pub input: String,
/// The index of the grapheme the cursor currently points to.
/// This hopefully rightfully assumes that a grapheme will be matching the block size on screen
/// and is treated as 'one character'. If not, it will be off, which isn't the end of the world.
// TODO: use `tui-textarea` for proper cursor handling, needs native crossterm events.
cursor_grapheme_idx: usize,
}
impl GlobPane {
pub fn process_events(&mut self, key: Key) {
use crosstermion::crossterm::event::KeyCode::*;
if key.kind == KeyEventKind::Release {
return;
}
match key.code {
Char(to_insert) => {
self.enter_char(to_insert);
}
Backspace => {
self.delete_char();
}
Left => {
self.move_cursor_left();
}
Right => {
self.move_cursor_right();
}
_ => {}
};
}
fn move_cursor_left(&mut self) {
let cursor_moved_left = self.cursor_grapheme_idx.saturating_sub(1);
self.cursor_grapheme_idx = self.clamp_cursor(cursor_moved_left);
}
fn move_cursor_right(&mut self) {
let cursor_moved_right = self.cursor_grapheme_idx.saturating_add(1);
self.cursor_grapheme_idx = self.clamp_cursor(cursor_moved_right);
}
fn enter_char(&mut self, new_char: char) {
self.input.insert(
self.input
.graphemes(true)
.take(self.cursor_grapheme_idx)
.map(|g| g.as_bytes().len())
.sum::<usize>(),
new_char,
);
for _ in 0..new_char.to_string().graphemes(true).count() {
self.move_cursor_right();
}
}
fn delete_char(&mut self) {
if self.cursor_grapheme_idx == 0 {
return;
}
let cur_idx = self.cursor_grapheme_idx;
let before_char_to_delete = self.input.graphemes(true).take(cur_idx - 1);
let after_char_to_delete = self.input.graphemes(true).skip(cur_idx);
self.input = before_char_to_delete.chain(after_char_to_delete).collect();
self.move_cursor_left();
}
fn clamp_cursor(&self, new_cursor_pos: usize) -> usize {
new_cursor_pos.clamp(0, self.input.graphemes(true).count())
}
pub fn render<B>(
&mut self,
props: impl Borrow<GlobPaneProps>,
area: Rect,
terminal: &mut Terminal<B>,
cursor: &mut Cursor,
) where
B: Backend,
{
let GlobPaneProps {
border_style,
has_focus,
} = props.borrow();
let title = "Git-Glob";
let block = Block::default()
.title(title)
.border_style(*border_style)
.borders(Borders::ALL);
let inner_block_area = block.inner(area);
block.render(area, terminal.current_buffer_mut());
let spans = vec![Span::from(&self.input)];
Paragraph::new(Text::from(Line::from(spans)))
.style(Style::default())
.render(
margin_left_right(inner_block_area, 1),
terminal.current_buffer_mut(),
);
if *has_focus {
draw_top_right_help(area, title, terminal.current_buffer_mut());
cursor.show = true;
cursor.x = inner_block_area.x
+ self
.input
.graphemes(true)
.take(self.cursor_grapheme_idx)
.map(|g| g.width())
.sum::<usize>() as u16
+ 1;
cursor.y = inner_block_area.y;
} else {
cursor.show = false;
}
}
}
fn draw_top_right_help(area: Rect, title: &str, buf: &mut Buffer) -> Rect {
let help_text = " search = enter | cancel = esc ";
let help_text_block_width = block_width(help_text);
let bound = Rect {
width: area.width.saturating_sub(1),
..area
};
if block_width(title) + help_text_block_width <= bound.width {
draw_text_nowrap_fn(
rect::snap_to_right(bound, help_text_block_width),
buf,
help_text,
|_, _, _| Style::default(),
);
}
bound
}
fn margin_left_right(r: Rect, margin: u16) -> Rect {
Rect {
x: r.x + margin,
y: r.y,
width: r.width - 2 * margin,
height: r.height,
}
}
fn glob_search_neighbours(
results: &mut Vec<TreeIndex>,
tree: &Tree,
root_index: TreeIndex,
glob: &gix_glob::Pattern,
path: &mut BString,
) {
for node_index in tree.neighbors_directed(root_index, Direction::Outgoing) {
if let Some(node) = tree.node_weight(node_index) {
let previous_len = path.len();
let basename_start = if path.is_empty() {
None
} else {
path.push(b'/');
Some(previous_len + 1)
};
path.extend_from_slice(gix_path::into_bstr(&node.name).as_ref());
if glob.matches_repo_relative_path(
path.as_ref(),
basename_start,
Some(node.is_dir),
gix_glob::pattern::Case::Fold,
gix_glob::wildmatch::Mode::NO_MATCH_SLASH_LITERAL,
) {
results.push(node_index);
} else {
glob_search_neighbours(results, tree, node_index, glob, path);
}
path.truncate(previous_len);
}
}
}
pub fn glob_search(tree: &Tree, root_index: TreeIndex, glob: &str) -> Result<Vec<TreeIndex>> {
let glob = gix_glob::Pattern::from_bytes_without_negation(glob.as_bytes())
.with_context(|| anyhow!("Glob was empty or only whitespace"))?;
let mut results = Vec::new();
let mut path = Default::default();
glob_search_neighbours(&mut results, tree, root_index, &glob, &mut path);
Ok(results)
}
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