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/**
* LSP extension — manifest + activate(host).
*
* Builds the manager with real adapters, registers the lsp tool and
* lspServiceHandle, and wires deactivate to manager.shutdownAll().
*/
import { extname, join } from "node:path";
import type { Extension, HostAPI, ServiceHandle } from "@dispatch/kernel";
import { defineService } from "@dispatch/kernel";
import { aggregateDiagnostics } from "./aggregate.js";
import type { SpawnedProcess } from "./client.js";
import { LspManager } from "./manager.js";
import { createLspTool } from "./tool.js";
import type {
DiagnosticsResult,
GetDiagnosticsOpts,
LspServerStatus,
LspService,
} from "./types.js";
export const lspServiceHandle: ServiceHandle<LspService> = defineService<LspService>("lsp");
function realSpawn(
command: string[],
opts: { readonly cwd: string; readonly env?: Readonly<Record<string, string>> | undefined },
): SpawnedProcess {
const env: Record<string, string | undefined> = { ...process.env };
if (opts.env) {
for (const [key, value] of Object.entries(opts.env)) {
env[key] = value;
}
}
const proc = Bun.spawn(command, {
cwd: opts.cwd,
env: env as Record<string, string>,
stdin: "pipe",
stdout: "pipe",
stderr: "pipe",
});
return {
stdin: proc.stdin,
stdout: proc.stdout,
stderr: proc.stderr,
pid: proc.pid,
kill: () => proc.kill(),
// Surface process exit so the client can stop querying a dead server
// and self-heal (respawn). Bun's Subprocess.exited resolves with the
// exit code (or rejects if killed by signal — treat as code:null).
onExit: (handler) => {
(proc as { exited: Promise<number | null> }).exited
.then((code) => handler({ code }))
.catch(() => handler({ code: null }));
},
};
}
function realFileWatcher(
root: string,
onEvent: (e: { readonly type: "create" | "change" | "delete"; readonly path: string }) => void,
): { readonly close: () => void } {
const { watch } = require("node:fs");
const watcher = watch(root, { recursive: true }, (eventType: string, filename: string | null) => {
if (!filename) return;
const fullPath = root.endsWith("/") ? `${root}${filename}` : `${root}/${filename}`;
const type = eventType === "rename" ? "create" : "change";
onEvent({ type, path: fullPath });
});
return { close: () => watcher.close() };
}
function realFs() {
return {
readText: async (path: string) => {
const file = Bun.file(path);
return file.text();
},
exists: async (path: string) => {
const file = Bun.file(path);
return file.exists();
},
};
}
export const extension: Extension = {
manifest: {
id: "lsp",
name: "Language Server Protocol",
version: "0.0.0",
apiVersion: "^0.1.0",
trust: "bundled",
activation: "eager",
capabilities: { spawn: true, fs: true },
contributes: { tools: ["lsp"], services: ["lsp"] },
},
activate(host: HostAPI) {
const logger = host.logger;
const manager = new LspManager({
spawn: realSpawn,
fileWatcher: realFileWatcher,
fs: realFs(),
logger: {
info: (msg, attrs) =>
logger.info(msg, attrs as Record<string, string | number | boolean | null> | undefined),
warn: (msg, attrs) =>
logger.warn(msg, attrs as Record<string, string | number | boolean | null> | undefined),
error: (msg, attrs) => logger.error(msg, attrs as Record<string, unknown> | undefined),
},
});
const lspTool = createLspTool(manager);
host.defineTool(lspTool);
const service: LspService = {
async status(cwd: string): Promise<readonly LspServerStatus[]> {
return manager.status(cwd);
},
async getDiagnostics(opts: GetDiagnosticsOpts): Promise<DiagnosticsResult> {
// 10s hard ceiling per server, regardless of what the caller
// passes (the edit hook still passes 60_000 — clamped here, so
// no other-unit edit is needed). A server that doesn't respond
// in 10s is skipped with a notice instead of waited out.
const PER_SERVER_CAP_MS = 10_000;
const timeoutMs = Math.min(opts.timeoutMs ?? PER_SERVER_CAP_MS, PER_SERVER_CAP_MS);
const fileExt = extname(opts.filePath).toLowerCase();
const absolutePath = opts.filePath.startsWith("/")
? opts.filePath
: join(opts.cwd, opts.filePath);
// Get all connected servers matching this file's extension.
// A dead/corrupted server has state:"error" and is excluded —
// no per-edit hang on a corpse.
const statuses = await manager.status(opts.cwd);
const matching = statuses.filter(
(s) => s.state === "connected" && s.extensions.some((ext) => ext === fileExt),
);
if (matching.length === 0) {
return { formatted: "", slow: false, timedOut: false };
}
const agg = await aggregateDiagnostics(
(id, root) => manager.getClient(id, root),
matching,
absolutePath,
timeoutMs,
{ text: opts.text, minSeverity: opts.minSeverity },
);
return { formatted: agg.formatted, slow: false, timedOut: agg.timedOut };
},
};
host.provideService(lspServiceHandle, service);
host.logger.info("LSP extension activated");
// Store manager for deactivate
(lspManagerStore as { manager: LspManager | null }).manager = manager;
},
deactivate() {
const store = lspManagerStore as { manager: LspManager | null };
store.manager?.shutdownAll();
store.manager = null;
},
};
// Module-scoped store for deactivate
const lspManagerStore: { manager: LspManager | null } = { manager: null };
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