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//! The Claude sessions card. Sourced from processes, so it lists every running
//! session — including the ones holding no listening socket, which a
//! port-sourced list cannot see.
use ratatui::prelude::*;
use ratatui::widgets::Paragraph;
use crate::app::{App, Focus};
use crate::sampler::sessions::ClaudeSession;
pub fn render(f: &mut Frame, area: Rect, app: &App) {
let focused = matches!(app.focus, Focus::Sessions);
let block = app.theme.panel_block("claude sessions", focused);
let inner = block.inner(area);
f.render_widget(block, area);
let sessions = app.sessions();
if sessions.is_empty() {
f.render_widget(
Paragraph::new("none running").style(Style::default().fg(app.theme.dim)),
inner,
);
return;
}
let visible = inner.height as usize;
let cursor = focused.then(|| app.selected());
let offset = super::scroll::offset(visible, cursor);
// tty and CPU are fixed-width; the project takes what is left. Reserve them
// first so a long project name cannot push them off the edge.
const TTY_W: usize = 8;
const CPU_W: usize = 6;
// The tty is only ever an answer to "which of these two identical rows is
// which". On a project with a single session it is 8 columns telling you
// something you cannot act on — you cannot map `ttys004` back to a window
// without running `tty` in every terminal you have open.
//
// So it appears per row, and the column is reserved for the whole card
// only when some row needs it: reserving per row instead would let the
// CPU figures jump left and right down the list.
// A host title already identifies the session, so a tty next to it would
// be answering a question nobody has. Collision is judged on what the row
// actually shows, not on the project underneath it.
// The project stays even when the host supplies a title. A title says
// what the session is *doing*; the project says which codebase it is
// doing it in, and two sessions can easily be doing similar things in
// different repos.
fn shown(s: &ClaudeSession) -> &str {
s.title.as_deref().unwrap_or(&s.project)
}
let collides = |s: &ClaudeSession| {
s.title.is_none() && sessions.iter().filter(|o| shown(o) == shown(s)).count() > 1
};
let any_collision = sessions.iter().any(collides);
let tty_w = if any_collision { TTY_W } else { 0 };
let label_w = (inner.width as usize).saturating_sub(tty_w + CPU_W + 2);
// The project gets what it needs up to a ceiling; the title takes the
// rest, and gets nothing when there is nothing to spare.
let widest_project = sessions.iter().map(|s| s.project.chars().count()).max().unwrap_or(0);
let any_title = sessions.iter().any(|s| s.title.is_some());
let proj_w = if any_title { widest_project.min(label_w.saturating_sub(8)).max(1) } else { label_w };
let title_w = label_w.saturating_sub(proj_w);
let lines: Vec<Line> = sessions
.iter()
.enumerate()
.skip(offset)
.take(visible)
.map(|(i, s)| {
let selected = cursor == Some(i);
let base = if selected {
Style::default().fg(app.theme.bg_cell).bg(app.theme.accent)
} else {
Style::default().fg(app.theme.text)
};
let cpu = match app.cpu_of(s.pid) {
Some(c) => format!("{c:>5.1}%"),
// An em-dash with no percent sign: unknown, not idle.
None => format!("{:>w$}", "—", w = CPU_W),
};
Line::from(vec![
// The host's own title when it has one — cmux names a
// workspace after the task the session is doing, which beats
// a project directory. Display only: the sort stays on
// project/tty/pid, because a title changes every few seconds
// and rows must not reorder under the cursor.
// Project first — it is what you scan for — then the host's
// own title in the space that is left. The title is truncated
// rather than the project: losing the end of "…pull latest
// changes" costs less than losing which repo it is.
Span::styled(format!(" {:<w$}", super::text::trunc(&s.project, proj_w), w = proj_w), base),
Span::styled(
match &s.title {
Some(t) if title_w > 1 => {
format!(" {:<w$}", super::text::trunc(t, title_w - 1), w = title_w - 1)
}
_ => " ".repeat(title_w),
},
if selected { base } else { Style::default().fg(app.theme.dim) },
),
Span::styled(
// Blank, not an em-dash, on a row that doesn't collide:
// a dash would read as "unknown tty" when the truth is
// "you don't need one".
match collides(s) {
true => format!("{:<w$}", s.tty.as_deref().unwrap_or("—"), w = tty_w),
false => " ".repeat(tty_w),
},
if selected { base } else { Style::default().fg(app.theme.dim) },
),
Span::styled(
cpu,
if selected { base } else { Style::default().fg(app.theme.accent) },
),
])
})
.collect();
f.render_widget(Paragraph::new(lines), inner);
}
#[cfg(test)]
mod tests {
use ratatui::backend::TestBackend;
use ratatui::Terminal;
use crate::app::App;
use super::ClaudeSession;
fn draw(w: u16, h: u16) -> Vec<String> {
draw_app(&App::demo(), w, h)
}
fn draw_app(app: &App, w: u16, h: u16) -> Vec<String> {
let mut t = Terminal::new(TestBackend::new(w, h)).unwrap();
t.draw(|f| super::render(f, f.area(), app)).unwrap();
let b = t.backend().buffer().clone();
(0..h).map(|y| (0..w).map(|x| b[(x, y)].symbol().to_string()).collect()).collect()
}
#[test]
fn two_sessions_in_one_project_are_told_apart_by_tty() {
let out = draw(40, 8).join("\n");
// This is the bug that motivated the card: both rows say "axterio",
// so the tty is the only thing distinguishing them.
assert!(out.contains("ttys020"), "first axterio session's tty missing:\n{out}");
assert!(out.contains("ttys021"), "second axterio session's tty missing:\n{out}");
}
#[test]
fn a_project_with_only_one_session_shows_no_tty() {
// The tty exists to tell two rows apart. On a row that is already
// unique it is 8 columns of noise you cannot act on — you cannot map
// ttys004 back to a window without running `tty` in each terminal.
let out = draw(40, 8).join("\n");
assert!(
!out.contains("ttys004"),
"whirr has one session, so its tty should not be shown:\n{out}"
);
}
#[test]
fn with_no_collisions_at_all_the_project_name_takes_the_whole_row() {
// Nothing to disambiguate anywhere, so the column itself goes and the
// name gets the width back. The name below is 26 characters: it fits
// the 30 columns available once the tty is gone, and would not have
// fit the 22 it left behind.
let mut app = App::demo();
let slow = app.slow.as_mut().expect("demo() ingests a slow snapshot");
slow.sessions = vec![
ClaudeSession {
pid: 1,
project: "a-project-with-a-long-name".into(),
title: None,
jumpable: false,
tty: Some("ttys001".into()),
},
ClaudeSession { pid: 2, project: "other".into(), title: None, jumpable: false, tty: Some("ttys002".into()) },
];
let out = draw_app(&app, 40, 8).join("\n");
assert!(!out.contains("ttys001"), "no collisions, so no tty column:\n{out}");
assert!(
out.contains("a-project-with-a-long-name"),
"the reclaimed columns should go to the name:\n{out}"
);
}
#[test]
fn a_session_shows_cpu_when_known_and_a_dash_when_not() {
let out = draw(40, 8).join("\n");
assert!(out.contains("8.1"), "known CPU missing:\n{out}");
assert!(out.contains('—'), "unknown CPU should render an em-dash:\n{out}");
assert!(!out.contains("—%"), "em-dash must not be followed by a percent sign");
}
#[test]
fn sessions_have_no_port_column() {
let out = draw(40, 8).join("\n");
assert!(!out.contains(':'), "session rows must not show ports:\n{out}");
}
#[test]
fn nothing_truncates_mid_value_at_forty_columns() {
for line in draw(40, 8) {
let t = line.trim_end();
assert!(!t.ends_with("tty"), "tty name cut short: {t:?}");
assert!(!t.ends_with("ttys"), "tty name cut short: {t:?}");
}
}
}