strop-engine 0.28.0

//! The unified event source (0018 §services): every async producer —
//! terminal, LSP, git, shell, picker, clipboard — lands on ONE channel
//! as a typed `AppEvent`. The main loop parks on it; workers wake the
//! loop the instant they post. Gone: the 500ms poll latency between a
//! job finishing and the UI noticing.
//!
//! Forwarder threads move each job channel into the app channel. The
//! headless harness keeps the raw channels (no forwarders) and drives
//! the same per-event handlers through the drains.

use std::sync::mpsc::Receiver;
mod channel;
pub use channel::{channel, EventSender, EVENTS_PER_TURN, TURN_BUDGET};

use super::{Editor, Key, ShellResult};

/// One app event. Terminal input is already translated to editor keys
/// by the reader thread.
#[derive(serde::Serialize, serde::Deserialize)]
pub enum AppEvent {
    Terminal(Key),
    /// Terminal resized — a redraw is owed even with no input (0020 §12).
    Resize {
        columns: u16,
        rows: u16,
    },
    /// Bracketed paste: one text payload, never a key stream.
    Paste(String),
    /// ctrl-c: the quit intent (0015's policy lives in the editor).
    QuitIntent,
    Lsp(strop_lsp::LspEvent),
    LspAttach(super::lsp::attach::AttachRecord),
    Shell(ShellResult),
    Io(super::io::IoEvent),
    RemoteCompletion(super::remote_completion::RemoteCompletionEvent),
    Container(super::containers::ContainerEvent),
    Git(super::GitJob),
    Picker(super::picker::PickerEvent),
    PickerRanking(super::picker::ranking::Event),
    Analysis(super::analysis::AnalysisEvent),
    Resolution(super::resolution::ResolutionEvent),
    ResumeInput,
    Preview(super::picker::PreviewResult),
    Clipboard(super::ClipboardResult),
}

/// A forwarder: move every item of a job channel onto the app channel.
fn forward<T: Send + 'static>(
    rx: Receiver<T>,
    tx: EventSender,
    wrap: impl Fn(T) -> AppEvent + Send + 'static,
) {
    std::thread::spawn(move || {
        while let Ok(item) = rx.recv() {
            if tx.send(wrap(item)).is_err() {
                break;
            }
        }
    });
}

impl Editor {
    /// Connect the editor's job channels to the app event channel
    /// (TUI only — headless keeps the raw channels for its drains).
    /// Late-attaching LSP servers forward through the retained sender.
    pub fn connect_events(&mut self, tx: EventSender) {
        if let Some(rx) = self.io.rx.take() {
            forward(rx, tx.clone(), AppEvent::Io);
        }
        if let Some(rx) = self.remote_completion.rx.take() {
            forward(rx, tx.clone(), AppEvent::RemoteCompletion);
        }
        if let Some(rx) = self.containers.take_rx() {
            forward(rx, tx.clone(), AppEvent::Container);
        }
        if let Some(rx) = self.shell_rx.take() {
            forward(rx, tx.clone(), AppEvent::Shell);
        }
        if let Some(rx) = self.git_rx.take() {
            forward(rx, tx.clone(), AppEvent::Git);
        }
        if let Some(rx) = self.clip_rx.take() {
            forward(rx, tx.clone(), AppEvent::Clipboard);
        }
        if let Some(rx) = self.preview_rx.take() {
            forward(rx, tx.clone(), AppEvent::Preview);
        }
        if let Some(rx) = self.picker_ranking.rx.take() {
            forward(rx, tx.clone(), AppEvent::PickerRanking);
        }
        if let Some(rx) = self.analysis.rx.take() {
            forward(rx, tx.clone(), AppEvent::Analysis);
        }
        if let Some(rx) = self.resolution.rx.take() {
            forward(rx, tx.clone(), AppEvent::Resolution);
        }
        self.connect_picker_stream(&tx);
        for srv in &mut self.lsp_servers {
            let rx = std::mem::replace(&mut srv.rx, std::sync::mpsc::channel().1);
            forward(rx, tx.clone(), AppEvent::Lsp);
        }
        let rx = self.lsp_state.attach.take_rx();
        forward(rx, tx.clone(), AppEvent::LspAttach);
        self.app_tx = Some(tx);
    }

    /// Route one event to its handler (the per-event halves of the old
    /// drain loops; the drains call these in a try_recv loop).
    pub fn handle_app_event(&mut self, ev: AppEvent) {
        match ev {
            AppEvent::Terminal(key) => self.feed(key),
            AppEvent::Resize { .. } => {} // the loop redraws after every event
            AppEvent::Paste(text) => {
                strop_trace::record_with(strop_trace::EventKind::Paste, || {
                    serde_json::json!({
                        "bytes":text.len(),"text":strop_trace::capture_content().then_some(text.as_str()),
                    })
                });
                if self.resolution.blocked() || !self.resolution.queue.is_empty() {
                    self.resolution
                        .queue
                        .push_back(super::resolution::DeferredInput::Paste(text));
                    return;
                }
                self.paste_bracketed(&text);
            }
            AppEvent::QuitIntent => {
                strop_trace::record_with(
                    strop_trace::EventKind::Input,
                    || serde_json::json!({"action":"quit_intent","source":"external"}),
                );
                self.resolution.cancel();
                self.resolution.queue.clear();
                if self.ctrl_c_quit() {
                    self.should_quit = true;
                }
            }
            AppEvent::Lsp(event) => self.handle_lsp_event(event),
            AppEvent::LspAttach(record) => self.handle_lsp_attach(record),
            AppEvent::Shell(r) => self.handle_shell_result(r),
            AppEvent::Io(event) => self.handle_io(event),
            AppEvent::RemoteCompletion(event) => self.handle_remote_completion(event),
            AppEvent::Container(event) => self.handle_container_event(event),
            AppEvent::Git(job) => self.handle_git_job(job),
            AppEvent::Picker(event) => self.handle_picker_event(event),
            AppEvent::PickerRanking(event) => self.handle_picker_ranking(event),
            AppEvent::Analysis(event) => self.handle_analysis(event),
            AppEvent::Resolution(event) => self.handle_resolution(event),
            AppEvent::ResumeInput => self.resume_resolution_input(),
            AppEvent::Preview(result) => self.handle_preview(result),
            AppEvent::Clipboard(content) => self.handle_clipboard(content),
        }
    }
}

impl Editor {
    /// Outstanding finite work, independent of whether channels are forwarded.
    pub fn async_pending(&self) -> bool {
        use strop_core::worker::Load;
        self.io_pending()
            || !self.shell_requests.is_empty()
            || self.clip_paste_pending.is_some()
            || self
                .picker
                .as_ref()
                .is_some_and(|glue| glue.picker.streaming || glue.rank_pending.is_some())
            || !self.picker_ranking.retiring.is_empty()
            || self.analysis.pending()
            || self.resolution.pending()
            || self
                .preview_loads
                .values()
                .any(|load| matches!(load, Load::Running(_)))
            || matches!(self.git_discovery, Load::Running(_))
            || matches!(self.hunk_load, Load::Running(_))
            || !self.log_requests.is_empty()
            || !self.dive_requests.is_empty()
            || self.card_request.is_some()
            || self.git_mutation.is_some()
            || !self.git_mutations.is_empty()
            || self
                .blame_gutters
                .values()
                .any(|gutter| gutter.request.is_some())
            || self.containers.pending.is_some()
            || !self.lsp_state.attach.pending.is_empty()
            || self.remote_completion.pending.is_some()
            || (!self.finishing
                && (self.lsp_state.hover.is_some()
                    || self.lsp_state.navigation.is_some()
                    || self.lsp_servers.iter().any(|server| !server.ready)))
    }

    /// Finish is an explicit action in both modes. Preserve accepted writes;
    /// cancel observational work so shutdown cannot depend on a slow reader.
    pub(crate) fn finish_background_work(&mut self) {
        self.finishing = true;
        self.lsp_state.attach.enabled = false;
        self.stop_remote_work();
        self.close_picker();
        self.analysis.stop();
        self.resolution.stop();
        self.git_mutations.clear();
        self.request_session_save();
        let cancel: Vec<_> = self
            .worker_handles
            .keys()
            .copied()
            .filter(|id| !self.io_write_pending(*id))
            .collect();
        for request in cancel {
            if let Some(handle) = self.worker_handles.remove(&request) {
                handle.cancel(strop_core::worker::CancelReason::Shutdown);
            }
        }
    }
}