#21 set from and to processing options

index.js

@@ -32,7 +32,7 @@ module.exports = function (processors, options) {
       }
     }
 
-    opts.from = file.path
+    opts.from = opts.to = file.path
 
     // Generate separate source map for gulp-sourcemap
     if (file.sourceMap) {
@@ -58,7 +58,7 @@ module.exports = function (processors, options) {
         map = result.map.toJSON()
         map.file = file.relative
         map.sources = [].map.call(map.sources, function (source) {
-          return path.relative(file.base, source)
+          return path.join(path.dirname(file.relative), source)
         })
         applySourceMap(file, map)
       }

package.json

@@ -27,8 +27,9 @@
     "vinyl-sourcemaps-apply": "^0.1.4"
   },
   "devDependencies": {
-    "es6-promise": "^2.0.1",
     "gulp-sourcemaps": "^1.5.1",
-    "mocha": "^2.2.1"
+    "mocha": "^2.2.1",
+    "proxyquire": "^1.4.0",
+    "sinon": "^1.14.1"
   }
 }

test.js

@@ -1,11 +1,11 @@
-/* global it, Promise */
+/* global it, beforeEach, afterEach, describe, Promise */
 
-require('es6-promise').polyfill()
 var assert = require('assert')
 var gutil = require('gulp-util')
 var sourceMaps = require('gulp-sourcemaps')
 var postcss = require('./index')
-
+var proxyquire = require('proxyquire')
+var sinon = require('sinon')
 
 it('should transform css with multiple processors', function (cb) {
 
@@ -111,6 +111,48 @@ it('should correctly generate relative source map', function (cb) {
 })
 
 
+describe('PostCSS Guidelines', function () {
+
+  var sandbox = sinon.sandbox.create()
+  var postcssStub = {
+    use: sandbox.stub()
+  , process: sandbox.stub()
+  }
+  var postcss = proxyquire('./index', {
+    postcss: function () {
+      return postcssStub
+    }
+  })
+
+
+  afterEach(function () {
+    sandbox.restore()
+  })
+
+
+  it('should set `from` and `to` processing options to `file.path`', function (cb) {
+
+    var stream = postcss([ doubler ])
+    var cssPath = __dirname + '/src/fixture.css'
+    postcssStub.process.returns(Promise.resolve({css:''}))
+
+    stream.on('data', function () {
+      postcssStub.process.calledWith('a {}', {from: cssPath, to: cssPath})
+      cb()
+    })
+
+    stream.write(new gutil.File({
+      contents: new Buffer('a {}')
+    , path: cssPath
+    }))
+
+    stream.end()
+
+  })
+
+})
+
+
 function doubler (css) {
   css.eachDecl(function (decl) {
     decl.parent.prepend(decl.clone())