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use std::collections::HashSet;
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Mutex;
use crate::layout::PaneId;
#[derive(Debug, Default)]
pub(crate) struct RenderRequest {
pub(crate) generic: bool,
pub(crate) pty_sources: HashSet<PaneId>,
pub(crate) terminal_title_sources: HashSet<PaneId>,
}
/// Coalesces render requests while retaining enough origin information for the
/// headless server to discard PTY-only updates hidden from every client.
#[derive(Debug, Default)]
pub(crate) struct RenderSignal {
pending: AtomicBool,
state: Mutex<RenderSignalState>,
}
#[derive(Debug, Default)]
struct RenderSignalState {
request: RenderRequest,
immediate_pty_sources: HashSet<PaneId>,
}
impl RenderSignal {
pub(crate) fn new() -> Self {
Self::default()
}
pub(crate) fn is_pending(&self) -> bool {
self.pending.load(Ordering::Acquire)
}
pub(crate) fn request_generic(&self) {
let mut state = self
.state
.lock()
.unwrap_or_else(std::sync::PoisonError::into_inner);
state.request.generic = true;
self.pending.store(true, Ordering::Release);
}
/// Returns true when the signal becomes pending or visible PTY work joins it.
pub(crate) fn request_pty(&self, pane_id: PaneId) -> bool {
let mut state = self
.state
.lock()
.unwrap_or_else(std::sync::PoisonError::into_inner);
let source_added = state.request.pty_sources.insert(pane_id);
let wake_for_source = source_added && state.immediate_pty_sources.contains(&pane_id);
let became_pending = !self.pending.swap(true, Ordering::AcqRel);
became_pending || wake_for_source
}
pub(crate) fn set_immediate_pty_sources(&self, sources: HashSet<PaneId>) {
self.state
.lock()
.unwrap_or_else(std::sync::PoisonError::into_inner)
.immediate_pty_sources = sources;
}
pub(crate) fn has_immediate_work(&self) -> bool {
let state = self
.state
.lock()
.unwrap_or_else(std::sync::PoisonError::into_inner);
state.request.generic
|| !state.request.terminal_title_sources.is_empty()
|| state
.request
.pty_sources
.iter()
.any(|pane_id| state.immediate_pty_sources.contains(pane_id))
}
/// Coalesces terminal-title changes separately from ordinary PTY damage so
/// consumers can update metadata without inspecting every pane.
pub(crate) fn request_terminal_title(&self, pane_id: PaneId) -> bool {
let mut state = self
.state
.lock()
.unwrap_or_else(std::sync::PoisonError::into_inner);
let source_added = state.request.terminal_title_sources.insert(pane_id);
let became_pending = !self.pending.swap(true, Ordering::AcqRel);
became_pending || source_added
}
pub(crate) fn pending_terminal_title_sources(&self) -> HashSet<PaneId> {
self.state
.lock()
.unwrap_or_else(std::sync::PoisonError::into_inner)
.request
.terminal_title_sources
.clone()
}
pub(crate) fn take(&self) -> RenderRequest {
let mut state = self
.state
.lock()
.unwrap_or_else(std::sync::PoisonError::into_inner);
self.pending.store(false, Ordering::Release);
std::mem::take(&mut state.request)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn coalesces_pty_sources_until_taken() {
let signal = RenderSignal::new();
let first = PaneId::from_raw(10);
let second = PaneId::from_raw(20);
assert!(signal.request_pty(first));
assert!(!signal.request_pty(first));
assert!(!signal.request_pty(second));
let request = signal.take();
assert!(!request.generic);
assert_eq!(request.pty_sources, HashSet::from([first, second]));
assert!(request.terminal_title_sources.is_empty());
assert!(!signal.is_pending());
}
#[test]
fn hidden_pty_sources_coalesce_to_one_wake() {
let signal = RenderSignal::new();
signal.set_immediate_pty_sources(HashSet::from([PaneId::from_raw(100)]));
let wakes = (1..=50)
.filter(|pane_id| signal.request_pty(PaneId::from_raw(*pane_id)))
.count();
assert_eq!(wakes, 1);
}
#[test]
fn immediate_pty_source_wakes_pending_hidden_work() {
let signal = RenderSignal::new();
let hidden = PaneId::from_raw(10);
let visible = PaneId::from_raw(20);
signal.set_immediate_pty_sources(HashSet::from([visible]));
assert!(signal.request_pty(hidden));
assert!(!signal.request_pty(PaneId::from_raw(30)));
assert!(signal.request_pty(visible));
assert!(!signal.request_pty(visible));
}
#[test]
fn terminal_title_source_wakes_pending_pty_work() {
let signal = RenderSignal::new();
let pane_id = PaneId::from_raw(10);
assert!(signal.request_pty(pane_id));
assert!(signal.request_terminal_title(pane_id));
assert!(!signal.request_terminal_title(pane_id));
}
#[test]
fn coalesces_terminal_title_sources_without_making_them_pty_damage() {
let signal = RenderSignal::new();
let pane_id = PaneId::from_raw(10);
assert!(signal.request_terminal_title(pane_id));
assert!(!signal.request_terminal_title(pane_id));
assert_eq!(
signal.pending_terminal_title_sources(),
HashSet::from([pane_id])
);
let request = signal.take();
assert!(request.pty_sources.is_empty());
assert_eq!(request.terminal_title_sources, HashSet::from([pane_id]));
}
#[test]
fn keeps_generic_and_pty_requests_distinct() {
let signal = RenderSignal::new();
let pane_id = PaneId::from_raw(10);
signal.request_generic();
assert!(!signal.request_pty(pane_id));
let request = signal.take();
assert!(request.generic);
assert_eq!(request.pty_sources, HashSet::from([pane_id]));
}
}
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