| // Copyright 2020 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| const chokidar = require('chokidar'); |
| const path = require('path'); |
| const childProcess = require('child_process'); |
| const cwd = process.cwd(); |
| const env = process.env; |
| const frontEndDir = path.join(cwd, 'front_end'); |
| const testsDir = path.join(cwd, 'test'); |
| |
| // Extract the target if it's provided. |
| let target = 'Default'; |
| const targetArg = process.argv.find(value => value.startsWith('--target=')); |
| if (targetArg) { |
| target = targetArg.slice('--target='.length); |
| } |
| |
| let restartBuild = false; |
| let autoninja; |
| const changedFiles = new Set(); |
| const onFileChange = (_, fileName) => { |
| // Some filesystems emit multiple events in quick succession for a |
| // single file change. Here we track the changed files, and reset |
| // after a short timeout. |
| if (changedFiles.has(fileName)) { |
| return; |
| } |
| changedFiles.add(fileName); |
| setTimeout(() => { |
| changedFiles.delete(fileName); |
| }, 250); |
| |
| // If the exitCode is null, autoninja is still running so stop it |
| // and try to restart it again. |
| const ninjaProcessExists = Boolean(autoninja && autoninja.pid); |
| if (ninjaProcessExists) { |
| const isRunning = ninjaProcessExists && autoninja.exitCode === null; |
| if (isRunning) { |
| autoninja.kill(); |
| restartBuild = true; |
| } |
| return; |
| } |
| |
| autoninja = childProcess.spawn('autoninja', ['-C', `out/${target}`], {cwd, env, stdio: 'inherit'}); |
| autoninja.on('close', () => { |
| autoninja = null; |
| if (restartBuild) { |
| restartBuild = false; |
| console.log(`\n${fileName} changed, restarting ninja\n`); |
| onFileChange(); |
| } |
| }); |
| }; |
| |
| // Watch the front_end and test folder and build on any change. |
| console.log(`Watching for changes in ${frontEndDir} and ${testsDir}; building to out/${target}`); |
| chokidar.watch(frontEndDir).on('all', onFileChange); |
| chokidar.watch(testsDir).on('all', onFileChange); |