270 lines
6.9 KiB
JavaScript
270 lines
6.9 KiB
JavaScript
'use strict'
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const fs = require('fs')
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const path = require('path')
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const EE = require('events').EventEmitter
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const Minimatch = require('minimatch').Minimatch
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class Walker extends EE {
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constructor (opts) {
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opts = opts || {}
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super(opts)
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this.path = opts.path || process.cwd()
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this.basename = path.basename(this.path)
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this.ignoreFiles = opts.ignoreFiles || [ '.ignore' ]
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this.ignoreRules = {}
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this.parent = opts.parent || null
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this.includeEmpty = !!opts.includeEmpty
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this.root = this.parent ? this.parent.root : this.path
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this.follow = !!opts.follow
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this.result = this.parent ? this.parent.result : new Set()
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this.entries = null
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this.sawError = false
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}
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sort (a, b) {
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return a.localeCompare(b)
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}
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emit (ev, data) {
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let ret = false
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if (!(this.sawError && ev === 'error')) {
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if (ev === 'error')
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this.sawError = true
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else if (ev === 'done' && !this.parent) {
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data = Array.from(data)
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.map(e => /^@/.test(e) ? `./${e}` : e).sort(this.sort)
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this.result = data
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}
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if (ev === 'error' && this.parent)
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ret = this.parent.emit('error', data)
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else
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ret = super.emit(ev, data)
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}
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return ret
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}
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start () {
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fs.readdir(this.path, (er, entries) =>
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er ? this.emit('error', er) : this.onReaddir(entries))
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return this
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}
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isIgnoreFile (e) {
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return e !== "." &&
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e !== ".." &&
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-1 !== this.ignoreFiles.indexOf(e)
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}
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onReaddir (entries) {
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this.entries = entries
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if (entries.length === 0) {
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if (this.includeEmpty)
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this.result.add(this.path.substr(this.root.length + 1))
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this.emit('done', this.result)
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} else {
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const hasIg = this.entries.some(e =>
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this.isIgnoreFile(e))
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if (hasIg)
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this.addIgnoreFiles()
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else
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this.filterEntries()
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}
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}
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addIgnoreFiles () {
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const newIg = this.entries
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.filter(e => this.isIgnoreFile(e))
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let igCount = newIg.length
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const then = _ => {
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if (--igCount === 0)
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this.filterEntries()
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}
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newIg.forEach(e => this.addIgnoreFile(e, then))
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}
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addIgnoreFile (file, then) {
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const ig = path.resolve(this.path, file)
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fs.readFile(ig, 'utf8', (er, data) =>
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er ? this.emit('error', er) : this.onReadIgnoreFile(file, data, then))
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}
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onReadIgnoreFile (file, data, then) {
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const mmopt = {
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matchBase: true,
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dot: true,
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flipNegate: true,
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nocase: true
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}
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const rules = data.split(/\r?\n/)
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.filter(line => !/^#|^$/.test(line.trim()))
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.map(r => new Minimatch(r, mmopt))
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this.ignoreRules[file] = rules
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then()
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}
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filterEntries () {
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// at this point we either have ignore rules, or just inheriting
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// this exclusion is at the point where we know the list of
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// entries in the dir, but don't know what they are. since
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// some of them *might* be directories, we have to run the
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// match in dir-mode as well, so that we'll pick up partials
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// of files that will be included later. Anything included
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// at this point will be checked again later once we know
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// what it is.
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const filtered = this.entries.map(entry => {
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// at this point, we don't know if it's a dir or not.
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const passFile = this.filterEntry(entry)
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const passDir = this.filterEntry(entry, true)
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return (passFile || passDir) ? [entry, passFile, passDir] : false
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}).filter(e => e)
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// now we stat them all
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// if it's a dir, and passes as a dir, then recurse
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// if it's not a dir, but passes as a file, add to set
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let entryCount = filtered.length
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if (entryCount === 0) {
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this.emit('done', this.result)
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} else {
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const then = _ => {
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if (-- entryCount === 0)
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this.emit('done', this.result)
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}
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filtered.forEach(filt => {
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const entry = filt[0]
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const file = filt[1]
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const dir = filt[2]
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this.stat(entry, file, dir, then)
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})
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}
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}
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onstat (st, entry, file, dir, then) {
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const abs = this.path + '/' + entry
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if (!st.isDirectory()) {
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if (file)
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this.result.add(abs.substr(this.root.length + 1))
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then()
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} else {
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// is a directory
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if (dir)
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this.walker(entry, then)
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else
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then()
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}
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}
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stat (entry, file, dir, then) {
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const abs = this.path + '/' + entry
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fs[this.follow ? 'stat' : 'lstat'](abs, (er, st) => {
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if (er)
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this.emit('error', er)
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else
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this.onstat(st, entry, file, dir, then)
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})
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}
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walkerOpt (entry) {
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return {
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path: this.path + '/' + entry,
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parent: this,
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ignoreFiles: this.ignoreFiles,
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follow: this.follow,
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includeEmpty: this.includeEmpty
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}
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}
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walker (entry, then) {
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new Walker(this.walkerOpt(entry)).on('done', then).start()
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}
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filterEntry (entry, partial) {
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let included = true
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// this = /a/b/c
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// entry = d
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// parent /a/b sees c/d
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if (this.parent && this.parent.filterEntry) {
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var pt = this.basename + "/" + entry
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included = this.parent.filterEntry(pt, partial)
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}
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this.ignoreFiles.forEach(f => {
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if (this.ignoreRules[f]) {
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this.ignoreRules[f].forEach(rule => {
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// negation means inclusion
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// so if it's negated, and already included, no need to check
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// likewise if it's neither negated nor included
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if (rule.negate !== included) {
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// first, match against /foo/bar
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// then, against foo/bar
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// then, in the case of partials, match with a /
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const match = rule.match('/' + entry) ||
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rule.match(entry) ||
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(!!partial && (
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rule.match('/' + entry + '/') ||
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rule.match(entry + '/'))) ||
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(!!partial && rule.negate && (
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rule.match('/' + entry, true) ||
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rule.match(entry, true)))
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if (match)
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included = rule.negate
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}
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})
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}
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})
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return included
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}
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}
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class WalkerSync extends Walker {
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constructor (opt) {
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super(opt)
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}
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start () {
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this.onReaddir(fs.readdirSync(this.path))
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return this
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}
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addIgnoreFile (file, then) {
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const ig = path.resolve(this.path, file)
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this.onReadIgnoreFile(file, fs.readFileSync(ig, 'utf8'), then)
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}
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stat (entry, file, dir, then) {
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const abs = this.path + '/' + entry
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const st = fs[this.follow ? 'statSync' : 'lstatSync'](abs)
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this.onstat(st, entry, file, dir, then)
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}
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walker (entry, then) {
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new WalkerSync(this.walkerOpt(entry)).start()
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then()
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}
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}
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const walk = (options, callback) => {
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const p = new Promise((resolve, reject) => {
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new Walker(options).on('done', resolve).on('error', reject).start()
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})
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return callback ? p.then(res => callback(null, res), callback) : p
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}
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const walkSync = options => {
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return new WalkerSync(options).start().result
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}
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module.exports = walk
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walk.sync = walkSync
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walk.Walker = Walker
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walk.WalkerSync = WalkerSync
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