code-server/ci/dev/watch.ts

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TypeScript
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import * as cp from "child_process"
import Bundler from "parcel-bundler"
import * as path from "path"
async function main(): Promise<void> {
try {
const watcher = new Watcher()
await watcher.watch()
} catch (error) {
console.error(error.message)
process.exit(1)
}
}
class Watcher {
private readonly rootPath = path.resolve(__dirname, "../..")
private readonly vscodeSourcePath = path.join(this.rootPath, "lib/vscode")
private static log(message: string, skipNewline = false): void {
process.stdout.write(message)
if (!skipNewline) {
process.stdout.write("\n")
}
}
public async watch(): Promise<void> {
let server: cp.ChildProcess | undefined
const restartServer = (): void => {
if (server) {
server.kill()
}
const s = cp.fork(path.join(this.rootPath, "out/node/entry.js"), process.argv.slice(2))
console.log(`[server] spawned process ${s.pid}`)
s.on("exit", () => console.log(`[server] process ${s.pid} exited`))
server = s
}
const vscode = cp.spawn("yarn", ["watch"], { cwd: this.vscodeSourcePath })
const tsc = cp.spawn("tsc", ["--watch", "--pretty", "--preserveWatchOutput"], { cwd: this.rootPath })
const plugin = cp.spawn("yarn", ["build", "--watch"], { cwd: process.env.PLUGIN_DIR })
const bundler = this.createBundler()
const cleanup = (code?: number | null): void => {
Watcher.log("killing vs code watcher")
vscode.removeAllListeners()
vscode.kill()
Watcher.log("killing tsc")
tsc.removeAllListeners()
tsc.kill()
Watcher.log("killing plugin")
plugin.removeAllListeners()
plugin.kill()
if (server) {
Watcher.log("killing server")
server.removeAllListeners()
server.kill()
}
Watcher.log("killing bundler")
process.exit(code || 0)
}
process.on("SIGINT", () => cleanup())
process.on("SIGTERM", () => cleanup())
vscode.on("exit", (code) => {
Watcher.log("vs code watcher terminated unexpectedly")
cleanup(code)
})
tsc.on("exit", (code) => {
Watcher.log("tsc terminated unexpectedly")
cleanup(code)
})
plugin.on("exit", (code) => {
Watcher.log("plugin terminated unexpectedly")
cleanup(code)
})
const bundle = bundler.bundle().catch(() => {
Watcher.log("parcel watcher terminated unexpectedly")
cleanup(1)
})
bundler.on("buildEnd", () => {
console.log("[parcel] bundled")
})
bundler.on("buildError", (error) => {
console.error("[parcel]", error)
})
vscode.stderr.on("data", (d) => process.stderr.write(d))
tsc.stderr.on("data", (d) => process.stderr.write(d))
plugin.stderr.on("data", (d) => process.stderr.write(d))
// From https://github.com/chalk/ansi-regex
const pattern = [
"[\\u001B\\u009B][[\\]()#;?]*(?:(?:(?:[a-zA-Z\\d]*(?:;[-a-zA-Z\\d\\/#&.:=?%@~_]*)*)?\\u0007)",
"(?:(?:\\d{1,4}(?:;\\d{0,4})*)?[\\dA-PR-TZcf-ntqry=><~]))",
].join("|")
const re = new RegExp(pattern, "g")
/**
* Split stdout on newlines and strip ANSI codes.
*/
const onLine = (proc: cp.ChildProcess, callback: (strippedLine: string, originalLine: string) => void): void => {
let buffer = ""
if (!proc.stdout) {
throw new Error("no stdout")
}
proc.stdout.setEncoding("utf8")
proc.stdout.on("data", (d) => {
const data = buffer + d
const split = data.split("\n")
const last = split.length - 1
for (let i = 0; i < last; ++i) {
callback(split[i].replace(re, ""), split[i])
}
// The last item will either be an empty string (the data ended with a
// newline) or a partial line (did not end with a newline) and we must
// wait to parse it until we get a full line.
buffer = split[last]
})
}
let startingVscode = false
let startedVscode = false
onLine(vscode, (line, original) => {
console.log("[vscode]", original)
// Wait for watch-client since "Finished compilation" will appear multiple
// times before the client starts building.
if (!startingVscode && line.includes("Starting watch-client")) {
startingVscode = true
} else if (startingVscode && line.includes("Finished compilation")) {
if (startedVscode) {
bundle.then(restartServer)
}
startedVscode = true
}
})
onLine(tsc, (line, original) => {
// tsc outputs blank lines; skip them.
if (line !== "") {
console.log("[tsc]", original)
}
if (line.includes("Watching for file changes")) {
bundle.then(restartServer)
}
})
onLine(plugin, (line, original) => {
// tsc outputs blank lines; skip them.
if (line !== "") {
console.log("[plugin]", original)
}
if (line.includes("Watching for file changes")) {
bundle.then(restartServer)
}
})
}
private createBundler(out = "dist"): Bundler {
return new Bundler(
[
path.join(this.rootPath, "src/browser/register.ts"),
path.join(this.rootPath, "src/browser/serviceWorker.ts"),
path.join(this.rootPath, "src/browser/pages/login.ts"),
path.join(this.rootPath, "src/browser/pages/vscode.ts"),
],
{
outDir: path.join(this.rootPath, out),
cacheDir: path.join(this.rootPath, ".cache"),
minify: !!process.env.MINIFY,
logLevel: 1,
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publicUrl: ".",
},
)
}
}
main()