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Mini Shell
var ProtoList = require('proto-list')
, path = require('path')
, fs = require('fs')
, ini = require('ini')
, EE = require('events').EventEmitter
, url = require('url')
, http = require('http')
var exports = module.exports = function () {
var args = [].slice.call(arguments)
, conf = new ConfigChain()
while(args.length) {
var a = args.shift()
if(a) conf.push
( 'string' === typeof a
? json(a)
: a )
}
return conf
}
//recursively find a file...
var find = exports.find = function () {
var rel = path.join.apply(null, [].slice.call(arguments))
function find(start, rel) {
var file = path.join(start, rel)
try {
fs.statSync(file)
return file
} catch (err) {
if(path.dirname(start) !== start) // root
return find(path.dirname(start), rel)
}
}
return find(__dirname, rel)
}
var parse = exports.parse = function (content, file, type) {
content = '' + content
// if we don't know what it is, try json and fall back to ini
// if we know what it is, then it must be that.
if (!type) {
try { return JSON.parse(content) }
catch (er) { return ini.parse(content) }
} else if (type === 'json') {
if (this.emit) {
try { return JSON.parse(content) }
catch (er) { this.emit('error', er) }
} else {
return JSON.parse(content)
}
} else {
return ini.parse(content)
}
}
var json = exports.json = function () {
var args = [].slice.call(arguments).filter(function (arg) { return arg != null })
var file = path.join.apply(null, args)
var content
try {
content = fs.readFileSync(file,'utf-8')
} catch (err) {
return
}
return parse(content, file, 'json')
}
var env = exports.env = function (prefix, env) {
env = env || process.env
var obj = {}
var l = prefix.length
for(var k in env) {
if(k.indexOf(prefix) === 0)
obj[k.substring(l)] = env[k]
}
return obj
}
exports.ConfigChain = ConfigChain
function ConfigChain () {
EE.apply(this)
ProtoList.apply(this, arguments)
this._awaiting = 0
this._saving = 0
this.sources = {}
}
// multi-inheritance-ish
var extras = {
constructor: { value: ConfigChain }
}
Object.keys(EE.prototype).forEach(function (k) {
extras[k] = Object.getOwnPropertyDescriptor(EE.prototype, k)
})
ConfigChain.prototype = Object.create(ProtoList.prototype, extras)
ConfigChain.prototype.del = function (key, where) {
// if not specified where, then delete from the whole chain, scorched
// earth style
if (where) {
var target = this.sources[where]
target = target && target.data
if (!target) {
return this.emit('error', new Error('not found '+where))
}
delete target[key]
} else {
for (var i = 0, l = this.list.length; i < l; i ++) {
delete this.list[i][key]
}
}
return this
}
ConfigChain.prototype.set = function (key, value, where) {
var target
if (where) {
target = this.sources[where]
target = target && target.data
if (!target) {
return this.emit('error', new Error('not found '+where))
}
} else {
target = this.list[0]
if (!target) {
return this.emit('error', new Error('cannot set, no confs!'))
}
}
target[key] = value
return this
}
ConfigChain.prototype.get = function (key, where) {
if (where) {
where = this.sources[where]
if (where) where = where.data
if (where && Object.hasOwnProperty.call(where, key)) return where[key]
return undefined
}
return this.list[0][key]
}
ConfigChain.prototype.save = function (where, type, cb) {
if (typeof type === 'function') cb = type, type = null
var target = this.sources[where]
if (!target || !(target.path || target.source) || !target.data) {
// TODO: maybe save() to a url target could be a PUT or something?
// would be easy to swap out with a reddis type thing, too
return this.emit('error', new Error('bad save target: '+where))
}
if (target.source) {
var pref = target.prefix || ''
Object.keys(target.data).forEach(function (k) {
target.source[pref + k] = target.data[k]
})
return this
}
var type = type || target.type
var data = target.data
if (target.type === 'json') {
data = JSON.stringify(data)
} else {
data = ini.stringify(data)
}
this._saving ++
fs.writeFile(target.path, data, 'utf8', function (er) {
this._saving --
if (er) {
if (cb) return cb(er)
else return this.emit('error', er)
}
if (this._saving === 0) {
if (cb) cb()
this.emit('save')
}
}.bind(this))
return this
}
ConfigChain.prototype.addFile = function (file, type, name) {
name = name || file
var marker = {__source__:name}
this.sources[name] = { path: file, type: type }
this.push(marker)
this._await()
fs.readFile(file, 'utf8', function (er, data) {
if (er) this.emit('error', er)
this.addString(data, file, type, marker)
}.bind(this))
return this
}
ConfigChain.prototype.addEnv = function (prefix, env, name) {
name = name || 'env'
var data = exports.env(prefix, env)
this.sources[name] = { data: data, source: env, prefix: prefix }
return this.add(data, name)
}
ConfigChain.prototype.addUrl = function (req, type, name) {
this._await()
var href = url.format(req)
name = name || href
var marker = {__source__:name}
this.sources[name] = { href: href, type: type }
this.push(marker)
http.request(req, function (res) {
var c = []
var ct = res.headers['content-type']
if (!type) {
type = ct.indexOf('json') !== -1 ? 'json'
: ct.indexOf('ini') !== -1 ? 'ini'
: href.match(/\.json$/) ? 'json'
: href.match(/\.ini$/) ? 'ini'
: null
marker.type = type
}
res.on('data', c.push.bind(c))
.on('end', function () {
this.addString(Buffer.concat(c), href, type, marker)
}.bind(this))
.on('error', this.emit.bind(this, 'error'))
}.bind(this))
.on('error', this.emit.bind(this, 'error'))
.end()
return this
}
ConfigChain.prototype.addString = function (data, file, type, marker) {
data = this.parse(data, file, type)
this.add(data, marker)
return this
}
ConfigChain.prototype.add = function (data, marker) {
if (marker && typeof marker === 'object') {
var i = this.list.indexOf(marker)
if (i === -1) {
return this.emit('error', new Error('bad marker'))
}
this.splice(i, 1, data)
marker = marker.__source__
this.sources[marker] = this.sources[marker] || {}
this.sources[marker].data = data
// we were waiting for this. maybe emit 'load'
this._resolve()
} else {
if (typeof marker === 'string') {
this.sources[marker] = this.sources[marker] || {}
this.sources[marker].data = data
}
// trigger the load event if nothing was already going to do so.
this._await()
this.push(data)
process.nextTick(this._resolve.bind(this))
}
return this
}
ConfigChain.prototype.parse = exports.parse
ConfigChain.prototype._await = function () {
this._awaiting++
}
ConfigChain.prototype._resolve = function () {
this._awaiting--
if (this._awaiting === 0) this.emit('load', this)
}
Zerion Mini Shell 1.0