Create prefix directory when using data.prefix.set

lib/data/data-prefix.coffee

@@ -1,3 +1,4 @@
+mkdirp = require('mkdirp')
 fsUtils = require('../fs-utils/fs-utils')
 
 prefix = null
@@ -9,8 +10,10 @@ exports.set = (newPrefix, callback) ->
 	if not fsUtils.isValidPath(newPrefix)
 		return callback?(new Error('Invalid path'))
 
-	prefix = newPrefix
-	return callback?(null, prefix)
+	mkdirp newPrefix, (error) ->
+		return callback?(error) if error?
+		prefix = newPrefix
+		return callback?()
 
 exports.clear = ->
 	prefix = null

lib/data/data-prefix.spec.coffee

@@ -1,7 +1,12 @@
 expect = require('chai').expect
 _ = require('lodash')
+async = require('async')
+fs = require('fs')
+fsUtils = require('../fs-utils/fs-utils')
+rimraf = require('rimraf')
 dataPrefix = require('./data-prefix')
 config = require('../config')
+mock = require('../../tests/utils/mock')
 
 PREFIXES =
 	main: config.dataPrefix
@@ -10,6 +15,12 @@ PREFIXES =
 
 describe 'DataPrefix:', ->
 
+	beforeEach ->
+		mock.fs.init()
+
+	afterEach ->
+		mock.fs.restore()
+
 	describe 'given no prefix', ->
 
 		beforeEach ->
@@ -22,6 +33,9 @@ describe 'DataPrefix:', ->
 
 		describe '#set()', ->
 
+			beforeEach (done) ->
+				rimraf(PREFIXES.main, done)
+
 			it 'should be able to set a prefix', (done) ->
 				expect(dataPrefix.get()).to.not.exist
 				dataPrefix.set PREFIXES.main, (error) ->
@@ -34,6 +48,29 @@ describe 'DataPrefix:', ->
 					expect(error).to.be.an.instanceof(Error)
 					done()
 
+			it 'should create the directory if it doesn\'t exist', (done) ->
+
+				async.waterfall [
+
+					(callback) ->
+						fs.exists PREFIXES.main, (exists) ->
+							return callback(null, exists)
+
+					(exists, callback) ->
+						expect(exists).to.be.false
+						dataPrefix.set(PREFIXES.main, callback)
+
+					(callback) ->
+						fsUtils.isDirectory(PREFIXES.main, callback)
+
+					(isDirectory, callback) ->
+						expect(isDirectory).to.be.true
+						return callback()
+
+				], (error) ->
+					expect(error).to.not.exist
+					done()
+
 	describe 'given a prefix', ->
 
 		beforeEach (done) ->

package.json

@@ -30,6 +30,7 @@
     "lodash": "~2.4.1",
     "async": "~0.9.0",
     "rimraf": "~2.2.8",
-    "commander": "~2.5.0"
+    "commander": "~2.5.0",
+    "mkdirp": "~0.5.0"
   }
 }