use diffler_core::vcs::LogEntry;
use ratatui::Frame;
use ratatui::layout::{Constraint, Layout};
use ratatui::style::Style;
use ratatui::text::{Line, Span};
use ratatui::widgets::{Block, Paragraph};
use crate::app::App;
use crate::keymap::Action;
use crate::theme::Theme;
use crate::ui::Hint;
use crate::ui::{commit_meta_spans, cursor_line, hint_line, status_bar};
const HINTS: &[Hint] = &[
Hint::Leaf(&[Action::Open], "open commit"),
Hint::Leaf(&[Action::MoveDown, Action::MoveUp], "move"),
Hint::Leaf(&[Action::Back], "back"),
];
pub fn draw(frame: &mut Frame<'_>, app: &mut App) {
let area = frame.area();
frame.render_widget(Block::new().style(app.theme.base()), area);
let [hint, body, bar] = Layout::vertical([
Constraint::Length(1),
Constraint::Min(0),
Constraint::Length(1),
])
.areas(area);
frame.render_widget(Paragraph::new(hint_line(app, HINTS)), hint);
let now = app.now_unix;
if let Some(log) = app.log.as_mut() {
log.viewport = body.height;
log.body = body;
let height = body.height.max(1) as usize;
if log.cursor < log.scroll {
log.scroll = log.cursor;
}
if log.cursor >= log.scroll + height {
log.scroll = log.cursor + 1 - height;
}
let selection = log.selection();
let selected =
|index: usize| selection.is_some_and(|(start, end)| index >= start && index <= end);
let lines: Vec<Line<'static>> = log
.entries
.iter()
.enumerate()
.skip(log.scroll)
.take(height)
.map(|(index, entry)| {
let line = entry_line(&app.theme, entry, now, body.width);
if index == log.cursor || selected(index) {
cursor_line(line, &app.theme, body.width)
} else {
line
}
})
.collect();
frame.render_widget(Paragraph::new(lines), body);
}
frame.render_widget(
Paragraph::new(status_bar(app, bar.width)).style(Style::new().bg(app.theme.panel)),
bar,
);
}
fn entry_line(theme: &Theme, entry: &LogEntry, now: i64, width: u16) -> Line<'static> {
let mut spans = vec![Span::styled(format!(" {} ", entry.oid7), theme.dim_style())];
if !entry.refs.is_empty() {
spans.push(Span::styled(
format!("[{}] ", entry.refs.join(" ")),
Style::new().fg(theme.accent).bg(theme.bg),
));
}
spans.push(Span::styled(entry.subject.clone(), theme.base()));
let used: usize = spans.iter().map(Span::width).sum();
spans.extend(commit_meta_spans(
theme,
&entry.author,
entry.time_unix,
now,
used,
width as usize,
));
Line::from(spans)
}
#[cfg(test)]
mod tests {
use ratatui::Terminal;
use ratatui::backend::TestBackend;
use crate::app::App;
use crate::config::LoadedConfig;
use crate::test_support::{key, mouse_click, standard_fixture};
fn render(app: &mut App) -> Terminal<TestBackend> {
let backend = TestBackend::new(120, 40);
let mut terminal = Terminal::new(backend).expect("terminal");
terminal
.draw(|frame| crate::ui::draw(frame, app))
.expect("draw");
terminal
}
fn newest_commit(app: &App) -> i64 {
app.log
.as_ref()
.unwrap()
.entries
.iter()
.map(|e| e.time_unix)
.max()
.unwrap_or(0)
}
#[test]
fn clicking_a_log_row_selects_it() {
let fixture = standard_fixture();
fixture.write("notes.txt", "a\n");
fixture.commit_all("second");
fixture.write("notes.txt", "a\nb\n");
fixture.commit_all("third");
let mut app = App::new(fixture.review(), LoadedConfig::default());
app.handle(key('l'));
app.handle(key('l'));
render(&mut app);
assert!(app.log.as_ref().unwrap().entries.len() >= 2);
let (body, scroll) = {
let log = app.log.as_ref().unwrap();
(log.body, log.scroll as u16)
};
app.handle(mouse_click(body.x + 1, body.y + 1 - scroll));
assert_eq!(app.log.as_ref().unwrap().cursor, 1);
}
#[test]
fn log_screen_renders_rows_with_refs_and_cursor() {
let fixture = standard_fixture();
fixture.write("notes.txt", "alpha\nbeta\n");
fixture.commit_all("add beta note");
fixture.branch("feat/topic");
let mut app = App::new(fixture.review(), LoadedConfig::default());
app.handle(key('l'));
app.handle(key('l'));
app.handle(key('j'));
app.now_unix = newest_commit(&app) + 3661;
let terminal = render(&mut app);
let content = terminal.backend().to_string();
assert!(content.contains("feat/topic"), "refs decorate: {content}");
assert!(content.contains("1h"), "commit age renders: {content}");
insta::assert_snapshot!(terminal.backend());
}
#[test]
fn log_visual_selection_highlights_the_range() {
let fixture = standard_fixture();
fixture.write("notes.txt", "alpha\nbeta\n");
fixture.commit_all("add beta note");
fixture.write("notes.txt", "alpha\nbeta\ngamma\n");
fixture.commit_all("add gamma note");
let mut app = App::new(fixture.review(), LoadedConfig::default());
app.handle(key('l'));
app.handle(key('l'));
app.handle(key('V'));
app.handle(key('j'));
assert_eq!(app.log.as_ref().unwrap().selection(), Some((0, 1)));
app.now_unix = newest_commit(&app) + 3661;
let terminal = render(&mut app);
let bg = format!("{:?}", app.theme.cursor_line);
let selected = format!("{:?}", terminal.backend().buffer())
.matches(&bg)
.count();
app.log.as_mut().unwrap().visual_anchor = None;
let unselected = format!("{:?}", render(&mut app).backend().buffer())
.matches(&bg)
.count();
assert!(
selected > unselected,
"selection must paint extra rows: {selected} vs {unselected}"
);
insta::assert_snapshot!(terminal.backend());
}
#[test]
fn log_scrolls_to_keep_the_cursor_visible() {
let fixture = standard_fixture();
for index in 0..30 {
fixture.write("notes.txt", &format!("rev {index}\n"));
fixture.commit_all(&format!("commit number {index}"));
}
let mut app = App::new(fixture.review(), LoadedConfig::default());
app.handle(key('l'));
app.handle(key('l'));
app.handle(key('G'));
let backend = TestBackend::new(120, 10);
let mut terminal = ratatui::Terminal::new(backend).expect("terminal");
terminal
.draw(|frame| crate::ui::draw(frame, &mut app))
.expect("draw");
let content = terminal.backend().to_string();
assert!(
content.contains("initial commit"),
"view follows the cursor to the oldest commit: {content}"
);
}
}