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 <a href="../../index.html">All files</a> / <a href="index.html">tar/lib</a> pack.js
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&nbsp;</td><td class="text"><pre class="prettyprint lang-js">'use strict'
&nbsp;
// A readable tar stream creator
// Technically, this is a transform stream that you write paths into,
// and tar format comes out of.
// The `add()` method is like `write()` but returns this,
// and end() return `this` as well, so you can
// do `new Pack(opt).add('files').add('dir').end().pipe(output)
// You could also do something like:
// streamOfPaths().pipe(new Pack()).pipe(new fs.WriteStream('out.tar'))
&nbsp;
class PackJob {
 constructor (path, absolute) {
 this.path = path || './'
 this.absolute = absolute
 this.entry = null
 this.stat = null
 this.readdir = null
 this.pending = false
 this.ignore = false
 this.piped = false
 }
}
&nbsp;
const MiniPass = require('minipass')
const zlib = require('minizlib')
const ReadEntry = require('./read-entry.js')
const WriteEntry = require('./write-entry.js')
const WriteEntrySync = WriteEntry.Sync
const WriteEntryTar = WriteEntry.Tar
const Yallist = require('yallist')
const EOF = Buffer.alloc(1024)
const ONSTAT = Symbol('onStat')
const ENDED = Symbol('ended')
const QUEUE = Symbol('queue')
const CURRENT = Symbol('current')
const PROCESS = Symbol('process')
const PROCESSING = Symbol('processing')
const PROCESSJOB = Symbol('processJob')
const JOBS = Symbol('jobs')
const JOBDONE = Symbol('jobDone')
const ADDFSENTRY = Symbol('addFSEntry')
const ADDTARENTRY = Symbol('addTarEntry')
const STAT = Symbol('stat')
const READDIR = Symbol('readdir')
const ONREADDIR = Symbol('onreaddir')
const PIPE = Symbol('pipe')
const ENTRY = Symbol('entry')
const ENTRYOPT = Symbol('entryOpt')
const WRITEENTRYCLASS = Symbol('writeEntryClass')
const WRITE = Symbol('write')
const ONDRAIN = Symbol('ondrain')
&nbsp;
const fs = require('fs')
const path = require('path')
const warner = require('./warn-mixin.js')
&nbsp;
const Pack = warner(class Pack extends MiniPass {
 constructor (opt) {
 super(opt)
 opt = opt || Object.create(null)
 this.opt = opt
 this.cwd = opt.cwd || process.cwd()
 this.maxReadSize = opt.maxReadSize
 this.preservePaths = !!opt.preservePaths
 this.strict = !!opt.strict
 this.noPax = !!opt.noPax
 this.prefix = (opt.prefix || '').replace(/(\\|\/)+$/, '')
 this.linkCache = opt.linkCache || new Map()
 this.statCache = opt.statCache || new Map()
 this.readdirCache = opt.readdirCache || new Map()
 this[WRITEENTRYCLASS] = WriteEntry
 if (typeof opt.onwarn === 'function')
 this.on('warn', opt.onwarn)
&nbsp;
 this.zip = null
 if (opt.gzip) {
 if (typeof opt.gzip !== 'object')
 opt.gzip = {}
 this.zip = new zlib.Gzip(opt.gzip)
 this.zip.on('data', chunk =&gt; super.write(chunk))
 this.zip.on('end', _ =&gt; super.end())
 this.zip.on('drain', _ =&gt; this[ONDRAIN]())
 this.on('resume', _ =&gt; this.zip.resume())
 } else
 this.on('drain', this[ONDRAIN])
&nbsp;
 this.portable = !!opt.portable
 this.noDirRecurse = !!opt.noDirRecurse
 this.follow = !!opt.follow
 this.noMtime = !!opt.noMtime
&nbsp;
&nbsp;
 this.filter = typeof opt.filter === 'function' ? opt.filter : _ =&gt; true
&nbsp;
 this[QUEUE] = new Yallist
 this[JOBS] = 0
 this.jobs = +opt.jobs || 4
 this[PROCESSING] = false
 this[ENDED] = false
 }
&nbsp;
 [WRITE] (chunk) {
 return super.write(chunk)
 }
&nbsp;
 add (path) {
 this.write(path)
 return this
 }
&nbsp;
 end (path) {
 if (path)
 this.write(path)
 this[ENDED] = true
 this[PROCESS]()
 return this
 }
&nbsp;
 write (path) {
 if (this[ENDED])
 throw new Error('write after end')
&nbsp;
 if (path instanceof ReadEntry)
 this[ADDTARENTRY](path)
 else
 this[ADDFSENTRY](path)
 return this.flowing
 }
&nbsp;
 [ADDTARENTRY] (p) {
 const absolute = path.resolve(this.cwd, p.path)
 if (this.prefix)
 p.path = this.prefix + '/' + p.path.replace(/^\.(\/+|$)/, '')
&nbsp;
 // in this case, we don't have to wait for the stat
 if (!this.filter(p.path, p))
 p.resume()
 else {
 const job = new PackJob(p.path, absolute, false)
 job.entry = new WriteEntryTar(p, this[ENTRYOPT](job))
 job.entry.on('end', _ =&gt; this[JOBDONE](job))
 this[JOBS] += 1
 this[QUEUE].push(job)
 }
&nbsp;
 this[PROCESS]()
 }
&nbsp;
 [ADDFSENTRY] (p) {
 const absolute = path.resolve(this.cwd, p)
 if (this.prefix)
 p = this.prefix + '/' + p.replace(/^\.(\/+|$)/, '')
&nbsp;
 this[QUEUE].push(new PackJob(p, absolute))
 this[PROCESS]()
 }
&nbsp;
 [STAT] (job) {
 job.pending = true
 this[JOBS] += 1
 const stat = this.follow ? 'stat' : 'lstat'
 fs[stat](job.absolute, (er, stat) =&gt; {
 job.pending = false
 this[JOBS] -= 1
 if (er)
 this.emit('error', er)
 else
 this[ONSTAT](job, stat)
 })
 }
&nbsp;
 [ONSTAT] (job, stat) {
 this.statCache.set(job.absolute, stat)
 job.stat = stat
&nbsp;
 // now we have the stat, we can filter it.
 if (!this.filter(job.path, stat))
 job.ignore = true
&nbsp;
 this[PROCESS]()
 }
&nbsp;
 [READDIR] (job) {
 job.pending = true
 this[JOBS] += 1
 fs.readdir(job.absolute, (er, entries) =&gt; {
 job.pending = false
 this[JOBS] -= 1
 if (er)
 return this.emit('error', er)
 this[ONREADDIR](job, entries)
 })
 }
&nbsp;
 [ONREADDIR] (job, entries) {
 this.readdirCache.set(job.absolute, entries)
 job.readdir = entries
 this[PROCESS]()
 }
&nbsp;
 [PROCESS] () {
 if (this[PROCESSING])
 return
&nbsp;
 this[PROCESSING] = true
 for (let w = this[QUEUE].head;
 w !== null &amp;&amp; this[JOBS] &lt; this.jobs;
 w = w.next) {
 this[PROCESSJOB](w.value)
 if (w.value.ignore) {
 const p = w.next
 this[QUEUE].removeNode(w)
 w.next = p
 }
 }
&nbsp;
 this[PROCESSING] = false
&nbsp;
 if (this[ENDED] &amp;&amp; !this[QUEUE].length &amp;&amp; this[JOBS] === 0) {
 if (this.zip)
 this.zip.end(EOF)
 else {
 super.write(EOF)
 super.end()
 }
 }
 }
&nbsp;
 get [CURRENT] () {
 return this[QUEUE] &amp;&amp; this[QUEUE].head &amp;&amp; this[QUEUE].head.value
 }
&nbsp;
 [JOBDONE] (job) {
 this[QUEUE].shift()
 this[JOBS] -= 1
 this[PROCESS]()
 }
&nbsp;
 [PROCESSJOB] (job) {
 if (job.pending)
 return
&nbsp;
 if (job.entry) {
 if (job === this[CURRENT] &amp;&amp; !job.piped)
 this[PIPE](job)
 return
 }
&nbsp;
 if (!job.stat) {
 if (this.statCache.has(job.absolute))
 this[ONSTAT](job, this.statCache.get(job.absolute))
 else
 this[STAT](job)
 }
 if (!job.stat)
 return
&nbsp;
 // filtered out!
 if (job.ignore)
 return
&nbsp;
 if (!this.noDirRecurse &amp;&amp; job.stat.isDirectory() &amp;&amp; !job.readdir) {
 if (this.readdirCache.has(job.absolute))
 this[ONREADDIR](job, this.readdirCache.get(job.absolute))
 else
 this[READDIR](job)
 if (!job.readdir)
 return
 }
&nbsp;
 // we know it doesn't have an entry, because that got checked above
 job.entry = this[ENTRY](job)
 if (!job.entry) {
 job.ignore = true
 return
 }
&nbsp;
 if (job === this[CURRENT] &amp;&amp; !job.piped)
 this[PIPE](job)
 }
&nbsp;
 [ENTRYOPT] (job) {
 return {
 onwarn: (msg, data) =&gt; {
 this.warn(msg, data)
 },
 noPax: this.noPax,
 cwd: this.cwd,
 absolute: job.absolute,
 preservePaths: this.preservePaths,
 maxReadSize: this.maxReadSize,
 strict: this.strict,
 portable: this.portable,
 linkCache: this.linkCache,
 statCache: this.statCache,
 noMtime: this.noMtime
 }
 }
&nbsp;
 [ENTRY] (job) {
 this[JOBS] += 1
 try {
 return new this[WRITEENTRYCLASS](job.path, this[ENTRYOPT](job))
 .on('end', () =&gt; this[JOBDONE](job))
 .on('error', er =&gt; this.emit('error', er))
 } catch (er) {
 this.emit('error', er)
 }
 }
&nbsp;
 [ONDRAIN] () {
 if (this[CURRENT] &amp;&amp; this[CURRENT].entry)
 this[CURRENT].entry.resume()
 }
&nbsp;
 // like .pipe() but using super, because our write() is special
 [PIPE] (job) {
 job.piped = true
&nbsp;
 if (job.readdir)
 job.readdir.forEach(entry =&gt; {
 const p = this.prefix ?
 job.path.slice(this.prefix.length + 1) || './'
 : job.path
&nbsp;
 const base = p === './' ? '' : p.replace(/\/*$/, '/')
 this[ADDFSENTRY](base + entry)
 })
&nbsp;
 const source = job.entry
 const zip = this.zip
&nbsp;
 if (zip)
 source.on('data', chunk =&gt; {
 if (!zip.write(chunk))
 source.pause()
 })
 else
 source.on('data', chunk =&gt; {
 if (!super.write(chunk))
 source.pause()
 })
 }
&nbsp;
 pause () {
 if (this.zip)
 this.zip.pause()
 return super.pause()
 }
})
&nbsp;
class PackSync extends Pack {
 constructor (opt) {
 super(opt)
 this[WRITEENTRYCLASS] = WriteEntrySync
 }
&nbsp;
 // pause/resume are no-ops in sync streams.
 pause () {}
 resume () {}
&nbsp;
 [STAT] (job) {
 const stat = this.follow ? 'statSync' : 'lstatSync'
 this[ONSTAT](job, fs[stat](job.absolute))
 }
&nbsp;
 [READDIR] (job, stat) {
 this[ONREADDIR](job, fs.readdirSync(job.absolute))
 }
&nbsp;
 // gotta get it all in this tick
 [PIPE] (job) {
 const source = job.entry
 const zip = this.zip
&nbsp;
 if (job.readdir)
 job.readdir.forEach(entry =&gt; {
 const p = this.prefix ?
 job.path.slice(this.prefix.length + 1) || './'
 : job.path
&nbsp;
&nbsp;
 const base = p === './' ? '' : p.replace(/\/*$/, '/')
 this[ADDFSENTRY](base + entry)
 })
&nbsp;
 if (zip)
 source.on('data', chunk =&gt; {
 zip.write(chunk)
 })
 else
 source.on('data', chunk =&gt; {
 super[WRITE](chunk)
 })
 }
}
&nbsp;
Pack.Sync = PackSync
&nbsp;
module.exports = Pack
&nbsp;</pre></td></tr>
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