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January 13, 2017 21:15
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watch a group of files and, on change, touch a different file
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// Example usage: | |
// node watch-and-touch 'src/**/*.post.css' src/styles-index.post.css | |
// | |
// Example will `touch` src/styles-index.post.css if any other css file | |
// under src changes. Potential usecase: webpack hot module reloading is | |
// working for your primary postcss file, but does not work for other | |
// postcss files imported from the main file. | |
// | |
// See: https://github.com/postcss/postcss-loader/issues/122 | |
// See: https://github.com/postcss/postcss-import/issues/233 | |
var chokidar = require('chokidar'); // "^1.6.1" | |
var Rx = require('rxjs'); // "5.0.0-rc.2" | |
const exec = require('child_process').exec; | |
var usage = 'node watch-and-touch file-glob-to-watch file-to-touch'; | |
var example = "node watch-and-touch 'src/**/*.post.css' src/styles-index.post.css"; | |
var watchPath = process.argv[2]; | |
var touchPath = process.argv[3]; | |
if (!(watchPath && touchPath)) { | |
console.error('Missing arguments'); | |
console.log(`usage: ${usage}`); | |
console.log(`example: ${example}`); | |
process.exit(1); | |
} | |
var eventsOnWatchPath = new Rx.Subject(); | |
// push relevant file system events to eventsOnWatchPath | |
chokidar.watch(watchPath, { | |
ignored: /[\/\\]\./, | |
persistent: true | |
}).on('all', (event, path) => eventsOnWatchPath.next({ event, path })); | |
function touch () { | |
exec(`touch ${touchPath}`, err => { | |
if (err) { | |
console.error(err); | |
} else { | |
console.log(`>>> touched ${touchPath}`); | |
} | |
}); | |
} | |
eventsOnWatchPath | |
// don't recurse if touchPath is matched by watchPath | |
.filter(e => e.path !== touchPath) | |
// chokidar begins by emitting all files matching watchPath, skip that | |
.skipUntil(Rx.Observable.timer(100)) | |
.do(e => console.log(`${e.event}: ${e.path}`)) | |
.sampleTime(500) | |
.subscribe(touch); | |
console.log(`>> Watching ${watchPath}. Will touch ${touchPath} on changes.`); |
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