| 1 | 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treeKill from \"tree-kill\";\nimport { resolve, dirname, extname, basename } from \"path\";\nimport { ChildProcess } from \"child_process\";\nimport { spawn } from \"cross-spawn\";\nimport chokidar from \"chokidar\";\nimport { Writable, Readable } from \"stream\";\nimport { Deque } from \"@blakeembrey/deque\";\nimport { template, Template } from \"@blakeembrey/template\";\n\nconst ECHO_JS_PATH = resolve(__dirname, \"echo.js\");\nconst ECHO_CMD = `${quote(process.execPath)} ${quote(ECHO_JS_PATH)}`;\n\n/**\n * State used for `onchange` commands.\n */\ninterface State {\n event: string;\n /** @deprecated use file instead */\n changed: string;\n file: string;\n fileExt: string;\n fileBase: string;\n fileBaseNoExt: string;\n fileDir: string;\n}\n\n/**\n * Execute a \"job\" on each change event.\n */\nclass Job {\n childCommand: ChildProcess | undefined;\n childOutpipe: ChildProcess | undefined;\n\n constructor(\n public log: (value: string) => void,\n public command: string[],\n public outpipe?: string\n ) {}\n\n start(\n cwd: string,\n stdin: Readable,\n stdout: Writable,\n stderr: Writable,\n env: NodeJS.ProcessEnv,\n onexit: () => void\n ) {\n if (this.outpipe) {\n const stdio = [null, stdout, stderr];\n\n this.log(`executing outpipe \"${this.outpipe}\"`);\n this.childOutpipe = spawn(this.outpipe, { cwd, env, stdio, shell: true });\n\n this.childOutpipe.on(\"exit\", (code, signal) => {\n this.log(`outpipe ${exitMessage(code, signal)}`);\n this.childOutpipe = undefined;\n if (!this.childCommand) return onexit();\n });\n }\n\n if (this.command.length) {\n const stdio = [\n stdin,\n // Use `--outpipe` when specified, otherwise direct to `stdout`.\n this.childOutpipe ? this.childOutpipe.stdin : stdout,\n stderr,\n ];\n\n this.log(`executing command \"${this.command.join(\" \")}\"`);\n this.childCommand = spawn(this.command[0], this.command.slice(1), {\n cwd,\n env,\n stdio,\n });\n\n this.childCommand.on(\"exit\", (code, signal) => {\n this.log(`command ${exitMessage(code, signal)}`);\n this.childCommand = undefined;\n if (!this.childOutpipe) return onexit();\n return this.childOutpipe?.stdin?.end();\n });\n } else {\n // No data to write to `outpipe`.\n this.childOutpipe?.stdin?.end();\n }\n }\n\n kill(killSignal?: NodeJS.Signals) {\n if (this.childOutpipe) {\n this.log(`killing outpipe ${this.childOutpipe.pid}`);\n treeKill(this.childOutpipe.pid, killSignal);\n }\n\n if (this.childCommand) {\n this.log(`killing command ${this.childCommand.pid}`);\n treeKill(this.childCommand.pid, killSignal);\n }\n }\n}\n\n/**\n * Onchange configuration options.\n */\nexport interface Options {\n add?: boolean;\n awaitWriteFinish?: number;\n command?: string[];\n cwd?: string;\n defaultExclude?: boolean;\n delay?: number;\n env?: NodeJS.ProcessEnv;\n exclude?: (string | ((path: string) => boolean))[];\n filter?: string[];\n initial?: boolean;\n jobs?: number;\n kill?: boolean;\n killSignal?: NodeJS.Signals;\n matches: string[];\n onReady?: () => void;\n outpipe?: string;\n poll?: number;\n stderr?: Writable;\n stdin?: Readable;\n stdout?: Writable;\n verbose?: boolean;\n}\n\n/**\n * Onchange manages\n */\nexport function onchange(options: Options): () => void {\n const { matches } = options;\n const onReady = options.onReady || (() => undefined);\n const initial = !!options.initial;\n const kill = !!options.kill;\n const cwd = options.cwd ? resolve(options.cwd) : process.cwd();\n const stdin: Readable = options.stdin || process.stdin;\n const stdout: Writable = options.stdout || process.stdout;\n const stderr: Writable = options.stderr || process.stderr;\n const env = options.env || process.env;\n const delay = Math.max(options.delay || 0, 0);\n const jobs = Math.max(options.jobs || 0, 1);\n const killSignal = options.killSignal || \"SIGTERM\";\n const command = options.command\n ? options.command.map((arg) => template<State>(arg))\n : [];\n const outpipe = options.outpipe\n ? outpipeTemplate(options.outpipe)\n : undefined;\n const filter = options.filter || [];\n const running = new Set<Job>();\n const queue = new Deque<Job>();\n\n // Logging.\n const log = options.verbose\n ? function log(message: string) {\n stdout.write(`onchange: ${message}\\n`);\n }\n : function () {};\n\n // Invalid, nothing to run on change.\n if (command.length === 0 && !outpipe) {\n throw new TypeError('Expected \"command\" and/or \"outpipe\" to be specified');\n }\n\n const ignored = options.exclude || [];\n const ignoreInitial = options.add !== true;\n const usePolling = options.poll !== undefined;\n const interval = options.poll !== undefined ? options.poll : undefined;\n const awaitWriteFinish = options.awaitWriteFinish\n ? { stabilityThreshold: options.awaitWriteFinish }\n : undefined;\n\n // Add default excludes to the ignore list.\n if (options.defaultExclude !== false) {\n ignored.push(\"**/node_modules/**\", \"**/.git/**\");\n }\n\n // Create the \"watcher\" instance for file system changes.\n const watcher = chokidar.watch(matches, {\n cwd,\n ignored,\n ignoreInitial,\n usePolling,\n interval,\n awaitWriteFinish,\n });\n\n /**\n * Try and dequeue the next job to run.\n */\n function dequeue() {\n // Nothing to process.\n if (queue.size === 0) return;\n\n // Too many jobs running already.\n if (running.size >= jobs) return;\n\n // Remove first job from queue (FIFO).\n const job = queue.popLeft();\n\n // Add job to running set.\n running.add(job);\n\n // Start the process and remove when finished.\n job.start(cwd, stdin, stdout, stderr, env, () => {\n running.delete(job);\n if (delay > 0) return setTimeout(dequeue, delay);\n return dequeue();\n });\n }\n\n /**\n * Enqueue the next change event to run.\n */\n function enqueue(event: string, file: string) {\n const fileExt = extname(file);\n const state: State = {\n event,\n changed: file,\n file,\n fileExt,\n fileBase: basename(file),\n fileBaseNoExt: basename(file, fileExt),\n fileDir: dirname(file),\n };\n\n // Kill all existing tasks on `enqueue`.\n if (kill) {\n queue.clear(); // Remove pending (\"killed\") tasks.\n running.forEach((child) => child.kill(killSignal)); // Kill running tasks.\n }\n\n // Log the event and the file affected.\n log(`${file}: ${event}`);\n\n // Add item to job queue.\n queue.push(\n new Job(\n log,\n command.map((arg) => arg(state)),\n outpipe?.(state)\n )\n );\n\n // Try to immediately run the enqueued job.\n return dequeue();\n }\n\n // Execute initial event without any changes.\n if (initial) enqueue(\"\", \"\");\n\n // For any change, creation or deletion, try to run.\n watcher.on(\"all\", (event, file) => {\n if (filter.length && filter.indexOf(event) === -1) return;\n\n return enqueue(event, file);\n });\n\n // On ready, prepare triggers.\n watcher.on(\"ready\", () => {\n log(`watcher ready`);\n\n // Notify external listener of \"ready\" event.\n return onReady();\n });\n\n watcher.on(\"error\", (error: Error) => log(`watcher error: ${error}`));\n\n // Return a close function.\n return () => watcher.close();\n}\n\n// Template generator for `outpipe` option.\nfunction outpipeTemplate(str: string): Template<State> {\n var value = str.trim();\n\n if (value.charAt(0) === \"|\" || value.charAt(0) === \">\") {\n return template<State>(`${ECHO_CMD} ${value}`);\n }\n\n return template<State>(value);\n}\n\n// Simple exit message generator.\nfunction exitMessage(code: number | null, signal: string | null) {\n return code === null ? `exited with ${signal}` : `completed with ${code}`;\n}\n\n/**\n * Quote value for `exec`.\n */\nfunction quote(str: string) {\n return `\"${str.replace(/[\"\\\\$`!]/g, \"\\\\$&\")}\"`;\n}\n"]} |