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//! Off-main-thread workers for file open: tree-sitter highlighter
//! build, LSP server spawn + initialize, and the fuzzy-preview producer
//! handoff. Each worker fires an [`AppEvent`] when done; the matching
//! `handle_*_ready` reconciles the result against the current
//! `open_gen` (so a stale result from a previous file open is dropped
//! instead of clobbering the active buffer).
use std::path::{Path, PathBuf};
use std::sync::Arc;
use std::thread;
use anyhow::Result;
use crate::event::AppEvent;
use crate::finder::PreviewEntry;
use crate::lsp::{self, LspClient};
use crate::syntax::Engine;
use crate::vlog;
use super::lsp_coordinator::client_key;
use super::{App, Toast, is_command_not_found, root_cause};
impl App {
/// Build a tree-sitter `Engine` for `path` off the main thread
/// (grammar dlopen + query compile + initial full parse). The result
/// arrives via [`AppEvent::EngineReady`] and is installed on the
/// buffer in [`Self::handle_engine_ready`] when the generation
/// still matches.
pub(super) fn spawn_engine_worker(&mut self, path: &Path) {
self.buffer.highlighter = None;
let Some(spec) = self.config.languages.by_path(path).cloned() else {
return;
};
// When the grammar/queries aren't installed but a recipe exists,
// offer to install rather than spawning a worker that would just
// fail with a "highlight failed" toast.
if self.maybe_prompt_grammar_install(&spec) {
return;
}
let loader = Arc::clone(&self.loader);
let tx = self.event_tx.clone();
let generation = self.open_gen;
// Snapshot the source we'll parse against. The user might edit
// the buffer while the worker runs; we recover by re-`refresh`-
// ing on the main thread when the highlighter arrives.
let source = self.buffer.lines.join("\n");
let buffer_version = self.buffer.version;
thread::spawn(move || {
let result = (|| -> Result<Engine> {
let mut h = loader.lock().unwrap().engine_for(&spec)?;
h.refresh(&source, buffer_version);
Ok(h)
})();
let _ = tx.send(AppEvent::EngineReady { generation, result });
});
}
/// Spawn one LSP server per `[[languages.<lang>.lsp]]` entry off
/// the main thread. Servers that are already running for this
/// language get an inline `didOpen` (cheap — no process spawn);
/// new ones fire `initialize` on a worker thread and arrive back
/// via [`AppEvent::LspReady`].
pub(super) fn spawn_lsp_worker(&mut self, path: &Path) {
let Some(spec) = self.config.languages.by_path(path).cloned() else {
return;
};
if spec.lsp.is_empty() {
return;
}
let lang_name = spec.name.clone();
// Per-extension `languageId` override — e.g. `.tsx` advertises
// `"typescriptreact"` even though our internal language name
// is `"tsx"`. The override is extension-keyed because the LSP
// protocol's id space is extension-driven; bare-filename
// languages (Dockerfile, Makefile) fall back to the language
// name, which is already the right answer for them.
let language_id_override = path
.extension()
.and_then(|s| s.to_str())
.and_then(|ext| self.config.languages.language_id_for_extension(ext))
.map(str::to_string);
for mut lsp_cfg in spec.lsp {
if let Some(ref id) = language_id_override {
lsp_cfg.language_id = Some(id.clone());
}
let key = client_key(&lang_name, &lsp_cfg.name);
if self.lsp.has_client(&key) {
let text = self.buffer.lines.join("\n");
if let Err(e) = self.lsp.did_open(&key, &lang_name, path, &text) {
self.push_toast(Toast::fatal(format!(
"lsp didOpen ({}): {}",
key,
root_cause(&e)
)));
}
continue;
}
let tx = self.event_tx.clone();
let emit = self.lsp.make_emit();
let startup_cwd = self.lsp.startup_cwd().to_path_buf();
let generation = self.open_gen;
let path_buf = path.to_path_buf();
let lang_for_thread = lang_name.clone();
let key_for_thread = key.clone();
let cfg = lsp_cfg;
thread::spawn(move || {
let root_dir = lsp::discover_root(&startup_cwd, Some(&path_buf), &cfg.root_markers);
let root_uri = lsp::path_to_uri(&root_dir);
vlog!(
"lsp spawn start key={} cmd={} root={}",
key_for_thread,
cfg.command,
root_dir.display(),
);
let result =
LspClient::spawn(&key_for_thread, &lang_for_thread, &cfg, &root_uri, emit);
match &result {
Ok(_) => vlog!("lsp spawn ok key={}", key_for_thread),
Err(e) => vlog!("lsp spawn err key={} err={:#}", key_for_thread, e),
}
let _ = tx.send(AppEvent::LspReady {
generation,
client_key: key_for_thread,
lang: lang_for_thread,
path: path_buf,
result,
});
});
}
}
/// Read the HEAD blob for `path` off the main thread and deliver it
/// via [`AppEvent::VcsBaseReady`]. `vcs::head_blob_lines` shells out
/// to git twice (`rev-parse` + `show`), which on a cold cache or a
/// large repo is slow enough to be felt at the first paint — so we
/// keep it off the open path and let the gutter fill in a frame
/// later. Reconciled by `open_gen` in [`Self::handle_vcs_base_ready`].
pub(super) fn spawn_vcs_worker(&mut self) {
let Some(path) = self.buffer.path.clone() else {
// Scratch buffer — nothing to diff against.
return;
};
let tx = self.event_tx.clone();
let generation = self.open_gen;
thread::spawn(move || {
let base = crate::vcs::head_blob_lines(&path);
let _ = tx.send(AppEvent::VcsBaseReady {
generation,
path,
base,
});
});
}
/// Install the HEAD base on the active buffer. Dropped when
/// `generation` is stale (another file was opened since) or the
/// active buffer's path drifted from the one we read — either way
/// the result no longer describes what's on screen.
pub fn handle_vcs_base_ready(
&mut self,
generation: u64,
path: PathBuf,
base: Option<Vec<String>>,
) {
if generation != self.open_gen {
return;
}
if self.buffer.path.as_deref() != Some(path.as_path()) {
return;
}
self.buffer.vcs_base = base;
self.buffer.vcs_diff.borrow_mut().take();
}
/// Install a freshly-built highlighter on the active buffer. Dropped
/// when `generation` doesn't match — the user opened another file
/// while the worker was running.
pub fn handle_engine_ready(&mut self, generation: u64, result: Result<Engine>) {
if generation != self.open_gen {
return;
}
match result {
Ok(mut h) => {
// The user may have edited the buffer while the worker
// was parsing the snapshot we handed it. Re-`refresh`
// here so the tree matches the live source.
if self.buffer.version != 0 {
let source = self.buffer.lines.join("\n");
h.refresh(&source, self.buffer.version);
}
if let Some(msg) = h.warnings.drain(..).next() {
self.push_toast(Toast::error(msg));
}
self.buffer.highlighter = Some(h);
}
Err(e) => {
self.push_toast(Toast::fatal(format!("highlight: {}", root_cause(&e))));
}
}
}
/// Adopt a freshly-spawned LSP client and send the deferred
/// `didOpen`. Dropped when `generation` doesn't match — the freshly
/// spawned client gets dropped here, which closes its stdin and
/// shuts the server down. `client_key` is the unique identifier
/// the coordinator stores the client under (typically
/// `"<lang>::<server-name>"`); a single `<lang>` may produce
/// multiple `LspReady` events when several servers are configured.
pub fn handle_lsp_ready(
&mut self,
generation: u64,
client_key: String,
lang: String,
path: PathBuf,
result: Result<LspClient>,
) {
if generation != self.open_gen {
return;
}
let client = match result {
Ok(c) => c,
Err(e) => {
// Built-in defaults reference servers most users won't
// have installed. Stay quiet when the binary isn't on
// PATH; surface every other failure.
if !is_command_not_found(&e) {
self.push_toast(Toast::fatal(format!(
"lsp ({}): {}",
client_key,
root_cause(&e)
)));
} else {
vlog!("lsp not on PATH key={} err={:#}", client_key, e);
}
return;
}
};
if !self.lsp.attach_client(&client_key, client) {
// A client for this key was attached between spawn and
// now (parallel open of another file with the same
// language). The freshly-spawned one is dropped here.
return;
}
// Re-snapshot the buffer — the user may have edited while the
// server was initializing.
let text = self.buffer.lines.join("\n");
if let Err(e) = self.lsp.did_open(&client_key, &lang, &path, &text) {
self.push_toast(Toast::fatal(format!(
"lsp didOpen ({}): {}",
client_key,
root_cause(&e)
)));
}
self.lsp.set_last_synced_version(self.buffer.version);
}
/// Insert a freshly-built fuzzy preview into the LRU. `last_preview_
/// request` is cleared when the arriving path matches it so the
/// draw path will re-enqueue if the user has already moved on.
pub fn handle_preview_ready(&mut self, entry: PreviewEntry) {
let mut pending = self.last_preview_request.borrow_mut();
if pending.as_deref() == Some(entry.path.as_path()) {
*pending = None;
}
self.preview_lru.borrow_mut().insert(entry);
}
}