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index.js
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var parallel = require('async-collection').parallel
var splicer = require('labeled-stream-splicer')
var fromString = require('from2-string')
var stream = require('readable-stream')
var parse = require('fast-json-parse')
var findup = require('@choojs/findup')
var EventEmitter = require('events')
var inherits = require('inherits')
var resolve = require('resolve')
var assert = require('assert')
var path = require('path')
var pump = require('pump')
var fs = require('fs')
module.exports = Documentify
var defaultHtml = '<!DOCTYPE html><html><head></head><body></body></html>'
function isStream (maybe) {
return maybe !== null && typeof maybe === 'object' && typeof maybe.pipe === 'function'
}
function Documentify (entry, html, opts) {
if (!(this instanceof Documentify)) return new Documentify(entry, html, opts)
EventEmitter.call(this)
if (entry) {
assert.strictEqual(typeof entry, 'string', 'documentify: entry should be type string')
}
if (typeof html === 'object' && !isStream(html)) {
opts = html
html = null
}
if (html && !isStream(html)) {
assert.strictEqual(typeof html, 'string', 'documentify: html should be type string or stream')
}
opts = opts || {}
this.html = html
this.transforms = []
this.entry = entry
this.basedir = opts.basedir || process.cwd()
this._ready = true
if (opts.transform) {
var self = this
var transforms = opts.transform
if (!Array.isArray(transforms)) {
transforms = [transforms]
}
transforms.forEach(function (t) {
if (Array.isArray(t)) {
self.transform(t[0], t[1])
} else {
self.transform(t)
}
})
}
}
inherits(Documentify, EventEmitter)
var placeholder = null
Documentify.prototype.transform = function (transform, opts) {
var self = this
opts = opts || {}
var internalOpts = { order: opts.order || 'main' }
if (typeof transform === 'string') {
var index = this.transforms.length
var basedir = opts.basedir || this.basedir
this.transforms.push([placeholder, opts, internalOpts])
this._ready = false
resolve(transform, { basedir: basedir }, function (err, resolved) {
if (err) {
self.emit('error', err)
}
if (resolved) {
self.transforms[index][0] = require(resolved)
}
if (self.transforms.every(function (tuple) { return tuple[0] !== placeholder })) {
self.emit('_ready')
self._ready = true
}
})
} else {
this.transforms.push([transform, opts, internalOpts])
}
return this
}
Documentify.prototype.createPipeline = function () {
var pipeline = splicer([
'start', [],
'main', [],
'end', []
])
this.transforms.forEach(function (tuple) {
var fn = tuple[0]
var opts = tuple[1]
var internalOpts = tuple[2]
var label = internalOpts.order
var transform = fn(opts)
pipeline.get(label).push(transform)
})
return pipeline
}
Documentify.prototype.bundle = function () {
var pts = new stream.PassThrough()
var self = this
var source
if (this._ready) {
onready()
} else {
this.on('_ready', onready)
}
function onready () {
var tasks = [
findTransforms,
createSource
]
parallel(tasks, function (err) {
if (err) return pts.emit('error', err)
var pipeline = self.createPipeline()
pump(source, pipeline, pts)
})
}
return pts
function findTransforms (done) {
var entry = self.entry ? path.join(path.dirname(self.entry), path.basename(self.entry)) : self.basedir
findup(entry, 'package.json', function (err, pathname) {
// no package.json found - just run local transforms
if (err) return done()
var filename = path.join(pathname, 'package.json')
fs.readFile(filename, function (err, file) {
if (err) return done(err)
var parsed = parse(file)
if (parsed.err) return done(parsed.err)
var json = parsed.value
var d = json.documentify
if (!d) return done()
var t = d.transform
if (!t || !Array.isArray(t)) return done()
loadTransforms(t, pathname, function (err, packageTransforms) {
if (err) return done(err)
self.transforms = packageTransforms.concat(self.transforms)
done()
})
})
})
}
function loadTransforms (transforms, basedir, done) {
parallel(transforms.map(function (transform, index) {
var name = transform
var opts = {}
if (Array.isArray(transform)) {
name = transform[0]
opts = transform[1]
}
// Run package.json transforms first by default.
var internalOpts = { order: opts.order || 'start' }
return function (done) {
resolve(name, { basedir: basedir }, function (err, resolved) {
if (err) return done(err)
done(null, [require(resolved), opts, internalOpts])
})
}
}), done)
}
function createSource (done) {
if (typeof self.html === 'string' || isStream(self.html)) {
source = isStream(self.html) ? self.html : fromString(self.html)
return done()
}
resolve(self.entry, { extensions: ['.html'] }, function (err, entry) {
if (err) {
source = fromString(defaultHtml)
} else {
source = fs.createReadStream(entry)
}
done()
})
}
}