Add compress option

Close #14

Author: MoOx

README.md

@@ -130,6 +130,10 @@ See [autoprefixer documentation of this option for more details](https://github.
 
 Default to something like `["> 1%", "last 2 versions", "Firefox ESR"]`.
 
+##### `compress` (default: `false`)
+
+Allow you to compress the output (using [CSSWring](https://github.com/hail2u/node-csswring)).
+
 ##### `sourcemap` (default: `false`)
 
 **If you want a accurate sourcemap, please use instead the `from` option.**

index.js

@@ -54,6 +54,11 @@ function cssnext(string, options) {
     }
   })
 
+  // simple minifier plugin
+  if (options.compress) {
+    postcss.use(require("csswring").postcss)
+  }
+
   return postcss.process(string, options).css
 }
 

package.json

@@ -28,6 +28,7 @@
   ],
   "dependencies": {
     "autoprefixer": "^2.2.0",
+    "csswring": "^1.0.0",
     "postcss": "^2.1.0",
     "postcss-calc": "^2.0.1",
     "postcss-color": "^1.0.0",

test/compress/expected.css

@@ -0,0 +1 @@
+body{color:red}

test/compress/input.css

@@ -0,0 +1,5 @@
+
+/* blah */
+body {
+    color  : red;
+}

test/index.js

@@ -48,6 +48,22 @@ Object.keys(cssnext.features).forEach(function(name) {
   })
 })
 
+/**
+ * Compress tests
+ */
+test("compress", function(t) {
+  t.equal(
+    cssnext(
+      read("compress/input"),
+      {compress: true}
+    ).trim(),
+    read("compress/expected").trim(),
+    "should compress on --compress (thanks Captain Obvious)"
+  )
+
+  t.end()
+})
+
 /**
  * Sourcemap tests
  */