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module.exports.watch = watch;
module.exports.resetWatchers = resetWatchers;
var debug = require('debug')('nodemon:watch');
var debugRoot = require('debug')('nodemon');
var chokidar = require('chokidar');
var undefsafe = require('undefsafe');
var config = require('../config');
var path = require('path');
var utils = require('../utils');
var bus = utils.bus;
var match = require('./match');
var watchers = [];
var debouncedBus;
bus.on('reset', resetWatchers);
function resetWatchers() {
debugRoot('resetting watchers');
watchers.forEach(function (watcher) {
watcher.close();
});
watchers = [];
}
function watch() {
if (watchers.length) {
debug('early exit on watch, still watching (%s)', watchers.length);
return;
}
var dirs = [].slice.call(config.dirs);
debugRoot('start watch on: %s', dirs.join(', '));
const rootIgnored = config.options.ignore;
debugRoot('ignored', rootIgnored);
var watchedFiles = [];
const promise = new Promise(function (resolve) {
const dotFilePattern = /[/\\]\./;
var ignored = match.rulesToMonitor(
[], // not needed
Array.from(rootIgnored),
config
).map(pattern => pattern.slice(1));
const addDotFile = dirs.filter(dir => dir.match(dotFilePattern));
// don't ignore dotfiles if explicitly watched.
if (addDotFile.length === 0) {
ignored.push(dotFilePattern);
}
var watchOptions = {
ignorePermissionErrors: true,
ignored: ignored,
persistent: true,
usePolling: config.options.legacyWatch || false,
interval: config.options.pollingInterval,
// note to future developer: I've gone back and forth on adding `cwd`
// to the props and in some cases it fixes bugs but typically it causes
// bugs elsewhere (since nodemon is used is so many ways). the final
// decision is to *not* use it at all and work around it
// cwd: ...
};
if (utils.isWindows) {
watchOptions.disableGlobbing = true;
}
if (process.env.TEST) {
watchOptions.useFsEvents = false;
}
var watcher = chokidar.watch(
dirs,
Object.assign({}, watchOptions, config.options.watchOptions || {})
);
watcher.ready = false;
var total = 0;
watcher.on('change', filterAndRestart);
watcher.on('add', function (file) {
if (watcher.ready) {
return filterAndRestart(file);
}
watchedFiles.push(file);
bus.emit('watching', file);
debug('chokidar watching: %s', file);
});
watcher.on('ready', function () {
watchedFiles = Array.from(new Set(watchedFiles)); // ensure no dupes
total = watchedFiles.length;
watcher.ready = true;
resolve(total);
debugRoot('watch is complete');
});
watcher.on('error', function (error) {
if (error.code === 'EINVAL') {
utils.log.error(
'Internal watch failed. Likely cause: too many ' +
'files being watched (perhaps from the root of a drive?\n' +
'See https://github.com/paulmillr/chokidar/issues/229 for details'
);
} else {
utils.log.error('Internal watch failed: ' + error.message);
process.exit(1);
}
});
watchers.push(watcher);
});
return promise.catch(e => {
// this is a core error and it should break nodemon - so I have to break
// out of a promise using the setTimeout
setTimeout(() => {
throw e;
});
}).then(function () {
utils.log.detail(`watching ${watchedFiles.length} file${
watchedFiles.length === 1 ? '' : 's'}`);
return watchedFiles;
});
}
function filterAndRestart(files) {
if (!Array.isArray(files)) {
files = [files];
}
if (files.length) {
var cwd = process.cwd();
if (this.options && this.options.cwd) {
cwd = this.options.cwd;
}
utils.log.detail(
'files triggering change check: ' +
files
.map(file => {
const res = path.relative(cwd, file);
return res;
})
.join(', ')
);
// make sure the path is right and drop an empty
// filenames (sometimes on windows)
files = files.filter(Boolean).map(file => {
return path.relative(process.cwd(), path.relative(cwd, file));
});
if (utils.isWindows) {
// ensure the drive letter is in uppercase (c:\foo -> C:\foo)
files = files.map(f => {
if (f.indexOf(':') === -1) { return f; }
return f[0].toUpperCase() + f.slice(1);
});
}
debug('filterAndRestart on', files);
var matched = match(
files,
config.options.monitor,
undefsafe(config, 'options.execOptions.ext')
);
debug('matched?', JSON.stringify(matched));
// if there's no matches, then test to see if the changed file is the
// running script, if so, let's allow a restart
if (config.options.execOptions && config.options.execOptions.script) {
const script = path.resolve(config.options.execOptions.script);
if (matched.result.length === 0 && script) {
const length = script.length;
files.find(file => {
if (file.substr(-length, length) === script) {
matched = {
result: [file],
total: 1,
};
return true;
}
});
}
}
utils.log.detail(
'changes after filters (before/after): ' +
[files.length, matched.result.length].join('/')
);
// reset the last check so we're only looking at recently modified files
config.lastStarted = Date.now();
if (matched.result.length) {
if (config.options.delay > 0) {
utils.log.detail('delaying restart for ' + config.options.delay + 'ms');
if (debouncedBus === undefined) {
debouncedBus = debounce(restartBus, config.options.delay);
}
debouncedBus(matched);
} else {
return restartBus(matched);
}
}
}
}
function restartBus(matched) {
utils.log.status('restarting due to changes...');
matched.result.map(file => {
utils.log.detail(path.relative(process.cwd(), file));
});
if (config.options.verbose) {
utils.log._log('');
}
bus.emit('restart', matched.result);
}
function debounce(fn, delay) {
var timer = null;
return function () {
const context = this;
const args = arguments;
clearTimeout(timer);
timer = setTimeout(() =>fn.apply(context, args), delay);
};
}
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