84 lines
2.0 KiB
JavaScript
84 lines
2.0 KiB
JavaScript
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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 useRunSequence = typeof tasks !== 'function';
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var runTasks;
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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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if (opts.ignoreInitial === undefined) 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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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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runTasks();
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}
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function tasksDone(err) {
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if (err) throw 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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}
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}
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module.exports = watch;
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