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file-list.js
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file-list.js
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'use strict'
const Promise = require('bluebird')
const mm = require('minimatch')
const Glob = require('glob').Glob
const fs = Promise.promisifyAll(require('graceful-fs'))
const pathLib = require('path')
const _ = require('lodash')
const File = require('./file')
const Url = require('./url')
const helper = require('./helper')
const log = require('./logger').create('watcher')
const createPatternObject = require('./config').createPatternObject
function byPath (a, b) {
if (a.path > b.path) return 1
if (a.path < b.path) return -1
return 0
}
class FileList {
constructor (patterns, excludes, emitter, preprocess, autoWatchBatchDelay) {
this._patterns = patterns || []
this._excludes = excludes || []
this._emitter = emitter
this._preprocess = Promise.promisify(preprocess)
this.buckets = new Map()
// A promise that is pending if and only if we are active in this.refresh_()
this._refreshing = null
const emit = () => {
this._emitter.emit('file_list_modified', this.files)
}
const debouncedEmit = _.debounce(emit, autoWatchBatchDelay)
this._emitModified = (immediate) => {
immediate ? emit() : debouncedEmit()
}
}
_findExcluded (path) {
return this._excludes.find((pattern) => mm(path, pattern))
}
_findIncluded (path) {
return this._patterns.find((pattern) => mm(path, pattern.pattern))
}
_findFile (path, pattern) {
if (!path || !pattern) return
return this._getFilesByPattern(pattern.pattern).find((file) => file.originalPath === path)
}
_exists (path) {
return !!this._patterns.find((pattern) => mm(path, pattern.pattern) && this._findFile(path, pattern))
}
_getFilesByPattern (pattern) {
return this.buckets.get(pattern) || []
}
_refresh () {
const matchedFiles = new Set()
let lastCompletedRefresh = this._refreshing
lastCompletedRefresh = Promise.map(this._patterns, (patternObject) => {
const pattern = patternObject.pattern
const type = patternObject.type
if (helper.isUrlAbsolute(pattern)) {
this.buckets.set(pattern, [new Url(pattern, type)])
return Promise.resolve()
}
const mg = new Glob(pathLib.normalize(pattern), { cwd: '/', follow: true, nodir: true, sync: true })
const files = mg.found
if (_.isEmpty(files)) {
this.buckets.set(pattern, [])
log.warn(`Pattern "${pattern}" does not match any file.`)
return
}
return Promise.map(files, (path) => {
if (this._findExcluded(path)) {
log.debug(`Excluded file "${path}"`)
return Promise.resolve()
}
if (matchedFiles.has(path)) {
return Promise.resolve()
}
matchedFiles.add(path)
const file = new File(path, mg.statCache[path].mtime, patternObject.nocache, type)
if (file.doNotCache) {
log.debug(`Not preprocessing "${pattern}" due to nocache`)
return Promise.resolve(file)
}
return this._preprocess(file).then(() => file)
})
.then((files) => {
files = _.compact(files)
this.buckets.set(pattern, files)
if (_.isEmpty(files)) {
log.warn(`All files matched by "${pattern}" were excluded or matched by prior matchers.`)
}
})
})
.then(() => {
// When we return from this function the file processing chain will be
// complete. In the case of two fast refresh() calls, the second call
// will overwrite this._refreshing, and we want the status to reflect
// the second call and skip the modification event from the first call.
if (this._refreshing !== lastCompletedRefresh) {
return this._refreshing
}
this._emitModified(true)
return this.files
})
return lastCompletedRefresh
}
get files () {
const served = []
const included = {}
const lookup = {}
this._patterns.forEach((p) => {
// This needs to be here sadly, as plugins are modifiying
// the _patterns directly resulting in elements not being
// instantiated properly
if (p.constructor.name !== 'Pattern') {
p = createPatternObject(p)
}
const files = this._getFilesByPattern(p.pattern)
files.sort(byPath)
if (p.served) {
served.push.apply(served, files) // TODO: replace with served.push(...files) after remove Node 4 support
}
files.forEach((file) => {
const other = lookup[file.path]
if (other && other.compare(p) < 0) return
lookup[file.path] = p
if (p.included) {
included[file.path] = file
} else {
delete included[file.path]
}
})
})
return {
served: _.uniq(served, 'path'),
included: _.values(included)
}
}
refresh () {
this._refreshing = this._refresh()
return this._refreshing
}
reload (patterns, excludes) {
this._patterns = patterns || []
this._excludes = excludes || []
return this.refresh()
}
addFile (path) {
const excluded = this._findExcluded(path)
if (excluded) {
log.debug(`Add file "${path}" ignored. Excluded by "${excluded}".`)
return Promise.resolve(this.files)
}
const pattern = this._findIncluded(path)
if (!pattern) {
log.debug(`Add file "${path}" ignored. Does not match any pattern.`)
return Promise.resolve(this.files)
}
if (this._exists(path)) {
log.debug(`Add file "${path}" ignored. Already in the list.`)
return Promise.resolve(this.files)
}
const file = new File(path)
this._getFilesByPattern(pattern.pattern).push(file)
return Promise.all([
fs.statAsync(path),
this._refreshing
])
.spread((stat) => {
file.mtime = stat.mtime
return this._preprocess(file)
})
.then(() => {
log.info(`Added file "${path}".`)
this._emitModified()
return this.files
})
}
changeFile (path, force) {
const pattern = this._findIncluded(path)
const file = this._findFile(path, pattern)
if (!file) {
log.debug(`Changed file "${path}" ignored. Does not match any file in the list.`)
return Promise.resolve(this.files)
}
return Promise.all([
fs.statAsync(path),
this._refreshing
]).spread((stat) => {
if (!force && stat.mtime <= file.mtime) throw new Promise.CancellationError()
file.mtime = stat.mtime
return this._preprocess(file)
})
.then(() => {
log.info(`Changed file "${path}".`)
this._emitModified(force)
return this.files
})
.catch(Promise.CancellationError, () => this.files)
}
removeFile (path) {
return Promise.try(() => {
const pattern = this._findIncluded(path)
const file = this._findFile(path, pattern)
if (file) {
helper.arrayRemove(this._getFilesByPattern(pattern.pattern), file)
log.info(`Removed file "${path}".`)
this._emitModified()
} else {
log.debug(`Removed file "${path}" ignored. Does not match any file in the list.`)
}
return this.files
})
}
}
FileList.factory = function (config, emitter, preprocess) {
return new FileList(config.files, config.exclude, emitter, preprocess, config.autoWatchBatchDelay)
}
FileList.factory.$inject = ['config', 'emitter', 'preprocess']
module.exports = FileList