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promzard.js
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promzard.js
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module.exports = promzard
promzard.PromZard = PromZard
var fs = require('fs')
var vm = require('vm')
var util = require('util')
var files = {}
var crypto = require('crypto')
var Stream = require('stream').Stream
var tty = require('tty')
var read = require('read')
var Module = require('module').Module
var path = require('path')
function promzard (file, ctx, cb) {
if (typeof ctx === 'function') cb = ctx, ctx = null;
if (!ctx) ctx = {};
var pz = new PromZard(file, ctx)
pz.on('error', cb)
pz.on('data', function (data) {
cb(null, JSON.parse(data))
})
}
function PromZard (file, ctx) {
if (!(this instanceof PromZard))
return new PromZard(file, ctx)
Stream.call(this)
this.readable = true
this.writable = true
this.file = file
this.ctx = ctx
this.unique = crypto.randomBytes(8).toString('hex')
this.on('pipe', function (src) {
// write output to dest
this.src = src
this.loaded()
})
// when finished, don't leave the terminal raw
this.on('error', this.unsetRaw)
this.on('data', this.unsetRaw)
this.load()
}
PromZard.prototype = Object.create(
Stream.prototype,
{ constructor: {
value: PromZard,
readable: true,
configurable: true,
writable: true,
enumerable: false } } )
PromZard.prototype.unsetRaw = function () {
this.setRaw(this.wasRaw || false)
}
PromZard.prototype.setRaw = function (f) {
if (this.src.isRaw &&
this.wasRaw === undefined)
this.wasRaw = this.src.isRaw()
else
this.wasRaw = true
if (f !== false)
f = true
var current = this.src.isRaw ? this.src.isRaw() : NaN
if (f === current)
return
if (this.src.setRawMode)
this.src.setRawMode(f)
else if (this.src === process.stdin)
tty.setRawMode(f)
}
PromZard.prototype.load = function () {
console.error('load')
if (files[this.file])
return this.loaded()
fs.readFile(this.file, 'utf8', function (er, d) {
if (er)
return this.emit('error', er)
files[this.file] = d
this.loaded()
}.bind(this))
}
PromZard.prototype.pipe = function (dest) {
console.error('pipe')
this.dest = dest
this.loaded()
Stream.prototype.pipe.call(this, dest)
}
PromZard.prototype.checkStreams = function () {
// if the output is stdout, then write prompts to
// stderr.
if (!this.src || !this.dest)
return
// write prompts to stdout by default
if (!this.promptStream)
this.promptStream = process.stdout
// unless that's where we're also writing the data
if (this.promptStream === this.dest)
switch (this.dest) {
case process.stdout:
this.promptStream = process.stderr
break
case process.stderr:
this.promptStream = process.stdout
break
default:
return this.emit('error', new Error('crossing the streams'))
}
this.setRaw()
}
PromZard.prototype.loaded = function () {
if (!files[this.file] ||
!this.src ||
!this.dest)
return
console.error('loaded')
this.checkStreams()
this.ctx.prompt = this.makePrompt()
this.ctx.__filename = this.file
this.ctx.__dirname = path.dirname(this.file)
this.ctx.__basename = path.basename(this.file)
var mod = this.ctx.module = this.makeModule()
this.ctx.require = function (path) {
return mod.require(path)
}
this.ctx.require.resolve = function(path) {
return Module._resolveFilename(path, mod);
}
this.ctx.exports = mod.exports
this.script = this.wrap(files[this.file])
console.error('got the script', this.script)
var fn = vm.runInThisContext(this.script, this.file)
console.error('got the fn')
var args = Object.keys(this.ctx).map(function (k) {
return this.ctx[k]
}.bind(this))
this.result = fn.apply(this.ctx, args)
console.error('result', this.result)
this.walk()
}
PromZard.prototype.makeModule = function (path) {
var mod = new Module(path, module)
mod.loaded = true
mod.filename = this.file
return mod
}
PromZard.prototype.wrap = function (body) {
var s = '(function( %s ) { return %s\n })'
var args = Object.keys(this.ctx).join(',')
return util.format(s, args, body)
}
PromZard.prototype.makePrompt = function () {
this.prompts = []
return prompt.bind(this)
function prompt () {
var p, d, t
for (var i = 0; i < arguments.length; i++) {
var a = arguments[i]
if (typeof a === 'string' && p)
d = a
else if (typeof a === 'string')
p = a
else if (typeof a === 'function')
t = a
}
try { return this.unique + '-' + this.prompts.length }
finally { this.prompts.push([p, d, t]) }
}
}
PromZard.prototype.walk = function (o, cb) {
o = o || this.result
cb = cb || function (er, res) {
if (er)
return this.emit('error', er)
this.result = res
return this.emit('data', res)
}
cb = cb.bind(this)
var keys = Object.keys(o)
var i = 0
var len = keys.length
console.error('walk', o, keys)
L.call(this)
function L () {
while (i < len) {
var k = keys[i]
var v = o[k]
i++
console.error('walk', o, k, v)
if (v && typeof v === 'object') {
return this.walk(v, function (er, res) {
if (er) return cb(er)
o[k] = res
L.call(this)
}.bind(this))
} else if (v &&
typeof v === 'string' &&
v.indexOf(this.unique) === 0) {
var n = +v.substr(this.unique.length + 1)
var prompt = this.prompts[n]
if (isNaN(n) || !prompt)
continue
// default to the key
if (undefined === prompt[0])
prompt[0] = k
return this.prompt(prompt, function (er, res) {
o[k] = res
L.call(this)
}.bind(this))
}
}
// made it to the end of the loop, maybe
if (i >= len)
return cb(null, o)
}
}
PromZard.prototype.prompt = function (pdt, cb) {
var prompt = pdt[0]
var def = pdt[1]
var tx = pdt[2]
if (tx)
cb = function (cb) { return function (er, data) {
return cb(er, data ? tx(data) : null)
}}(cb)
read({ prompt: prompt + ': ' , default: def }, cb)
}