100 lines
2.5 KiB
JavaScript
100 lines
2.5 KiB
JavaScript
var chokidar = require('chokidar');
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var runSequence = require('run-sequence');
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var path = require('path');
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function watch(globs, opts, tasks) {
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if (typeof opts !== 'object' || Array.isArray(opts)) {
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tasks = opts;
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opts = {};
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}
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var triggerCount = 0;
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var useRunSequence = typeof tasks !== 'function';
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var runTasks;
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var log = typeof opts.log === 'function' ? opts.log : function noop() {};
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if (useRunSequence) {
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if (!Array.isArray(tasks)) tasks = [tasks];
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tasks = tasks.slice();
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tasks.push(tasksDone);
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runTasks = function runTaskSequence() {
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runSequence.apply(null, tasks);
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}
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} else {
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var sync = tasks.length === 0;
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runTasks = function runCallback() {
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try {
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tasks(tasksDone);
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if (sync) tasksDone();
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} catch (e) {
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return tasksDone(e);
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}
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}
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}
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var events = opts.events = opts.events || ['add', 'change', 'unlink'];
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// Don't let chokidar call us while initializing because on large trees it might take too long for
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// all the add events to be emitted which causes the initial callback to be triggered more than
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// once. Instead, we call handleEvent directly.
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var ignoreInitial = opts.ignoreInitial;
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opts.ignoreInitial = true;
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var delay = opts.delay;
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if (delay === undefined) delay = 100;
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var watcher = chokidar.watch(globs, opts).
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on('all', handleEvent).
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on('error', function(err) {
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throw err;
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});
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var close = watcher.close.bind(watcher);
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watcher.close = function() {
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if (timeoutId !== null) clearTimeout(timeoutId);
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close();
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};
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var eventsRecorded = 0; // Number of events recorded
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var timeoutId = null; // If non-null, event capture window is open
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if (!ignoreInitial) {
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handleEvent('change', 'madeupFilePath'); // synthetic event to kick off the first task run
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}
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return watcher;
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function handleEvent(event, filepath) {
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// Ignore unwatched events
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if (events.indexOf(event) < 0) return;
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// Increment number of events captured in this window
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++eventsRecorded;
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if (timeoutId === null) {
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timeoutId = setTimeout(invokeCallback, delay);
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}
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}
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function invokeCallback() {
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eventsRecorded = 0;
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log(++triggerCount);
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runTasks();
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}
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function tasksDone(err) {
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if (eventsRecorded) {
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// eventsRecorded has increased during the run, run again on the next turn
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timeoutId = setTimeout(invokeCallback, 0);
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} else {
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timeoutId = null;
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}
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if (!useRunSequence && err) {
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console.log('Watch task error:', err.toString());
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}
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}
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}
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module.exports = watch;
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