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watcher.js
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watcher.js
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var chokidar = require('chokidar');
var mm = require('minimatch');
var helper = require('./helper');
var log = require('./logger').create('watcher');
var DIR_SEP = require('path').sep;
// Get parent folder, that be watched (does not contain any special globbing character)
var baseDirFromPattern = function(pattern) {
return pattern.replace(/\/[^\/]*[\*\(].*$/, '') || '/';
};
var watchPatterns = function(patterns, watcher) {
// filter only unique non url patterns paths
var pathsToWatch = [];
var uniqueMap = {};
var path;
patterns.forEach(function(pattern) {
path = baseDirFromPattern(pattern);
if (!uniqueMap[path]) {
uniqueMap[path] = true;
pathsToWatch.push(path);
}
});
// watch only common parents, no sub paths
pathsToWatch.forEach(function(path) {
if (!pathsToWatch.some(function(p) {
return p !== path && path.substr(0, p.length + 1) === p + DIR_SEP;
})) {
watcher.add(path);
log.debug('Watching "%s"', path);
}
});
};
// Function to test if a path should be ignored by chokidar.
var createIgnore = function(patterns, excludes) {
return function(path, stat) {
if (!stat || stat.isDirectory()) {
return false;
}
// Check if the path matches any of the watched patterns.
if (!patterns.some(function(pattern) {
return mm(path, pattern, {dot: true});
})) {
return true;
}
// Check if the path matches any of the exclude patterns.
if (excludes.some(function(pattern) {
return mm(path, pattern, {dot: true});
})) {
return true;
}
return false;
};
};
var onlyWatchedTrue = function(pattern) {
return pattern.watched;
};
var getWatchedPatterns = function(patternObjects) {
return patternObjects.filter(onlyWatchedTrue).map(function(patternObject) {
return patternObject.pattern;
});
};
exports.watch = function(patterns, excludes, fileList, usePolling) {
var watchedPatterns = getWatchedPatterns(patterns);
var options = {
usePolling: usePolling,
ignorePermissionErrors: true,
ignoreInitial: true,
ignored: createIgnore(watchedPatterns, excludes)
};
var chokidarWatcher = new chokidar.FSWatcher(options);
watchPatterns(watchedPatterns, chokidarWatcher);
var bind = function(fn) {
return function(path) {
return fn.call(fileList, helper.normalizeWinPath(path));
};
};
// register events
chokidarWatcher.on('add', bind(fileList.addFile))
.on('change', bind(fileList.changeFile))
.on('unlink', bind(fileList.removeFile));
return chokidarWatcher;
};
exports.watch.$inject = ['config.files', 'config.exclude', 'fileList', 'config.usePolling'];