Merge pull request #1731 from coralproject/next-watcher-flags

Watcher --only

scripts/watcher/bin/watcher.ts

@@ -4,16 +4,24 @@ import program from "commander";
 import path from "path";
 import watch from "../";
 
+function list(val: string) {
+  return val.split(",");
+}
+
 program
   .version("0.1.0")
   .usage("<configFile>")
+  .option("-o, --only <watcher>", "only run the specified watcher", list)
   .arguments("<configFile>")
   .description("Run watchers defined in <configFile>")
-  .action(configFile => {
+  .action((configFile, cmd) => {
+    const { only = [] } = cmd;
+
     let config: any = require(path.resolve(configFile));
     if (config.__esModule) {
       config = config.default;
     }
-    watch(config);
+
+    watch(config, { only });
   })
   .parse(process.argv);

scripts/watcher/types.ts

@@ -17,6 +17,10 @@ export interface Executor {
   execute(filePath: string): void;
 }
 
+export interface Options {
+  only?: string[];
+}
+
 export interface Config {
   rootDir?: string;
   backend?: Watcher;

scripts/watcher/watch.ts

@@ -2,7 +2,7 @@ import Joi from "joi";
 import path from "path";
 
 import ChokidarWatcher from "./ChokidarWatcher";
-import { Config, configSchema, WatchConfig, Watcher } from "./types";
+import { Config, configSchema, Options, WatchConfig, Watcher } from "./types";
 
 // Polyfill the asyncIterator symbol.
 if (Symbol.asyncIterator === undefined) {
@@ -43,9 +43,22 @@ function setupCleanup(config: Config) {
   );
 }
 
-export default async function watch(config: Config) {
+function filterOnly(config: Config, only: string[]) {
+  for (const key of Object.keys(config.watchers)) {
+    if (only.indexOf(key) === -1) {
+      // tslint:disable-next-line:no-console
+      console.log(`Disabled watcher "${key}"`);
+      delete config.watchers[key];
+    }
+  }
+}
+
+export default async function watch(config: Config, options?: Options) {
   Joi.assert(config, configSchema);
   const watcher = config.backend || new ChokidarWatcher();
+  if (options && options.only && options.only.length > 0) {
+    filterOnly(config, options.only);
+  }
   setupCleanup(config);
   for (const key of Object.keys(config.watchers)) {
     // tslint:disable-next-line:no-console