String

README.md

@@ -20,7 +20,8 @@ var fixtures = path.resolve.bind(path, __dirname, 'fixtures')
 
 postcss(url([
   [ util.inline, { maxSize: 5 } ],
-  [ util.copy, { assetOutFolder: fixtures('build', 'images') } ],
+  // equivalent with util.copy
+  [ 'copy', { assetOutFolder: fixtures('build', 'images') } ],
 ]))
 .process(
   '.a{ background-image: url(images/octocat_setup.png); }',
@@ -41,7 +42,11 @@ Type: `Array`
 
 Default: `[ util.rebase ]`
 
-An array of transforms
+An array of transforms.
+
+If an element is not a function,
+it should be the name of a method exported by `util`:
+`'copy'`, `'inline'`, `'rebase'`.
 
 ### transforms
 
@@ -52,7 +57,8 @@ Signature: `transformFn(result, ...args)`
 Function to transform url,
 through modifying  `result.url`
 
-If `Array`, `args` will be the elements from the second.
+If `Array`, the first element should be the transform function,
+and elements after the first will be treated as its arguments `args`.
 
 #### result
 

lib/result.js

@@ -3,6 +3,7 @@
 const Url = require('url')
 const path = require('path')
 const Asset = require('./asset')
+const util = require('./util')
 
 class Result {
   constructor(url, opts) {
@@ -46,6 +47,9 @@ class Result {
     })
     return trs.reduce(function (p, tr) {
       return p.then(function () {
+        if (typeof tr[0] === 'string') {
+          tr[0] = util[tr[0]]
+        }
         let r = tr[0].apply(null, tr.slice(1))
         if (r && typeof r.then === 'function') {
           return r

package.json

@@ -5,8 +5,9 @@
   "main": "index.js",
   "scripts": {
     "test": "npm run lint && tap test/*.js",
+    "cov": "npm run lint && tap --cov test/*.js",
     "lint": "eslint *.js 'lib/**/*.js' test/*.js bin/*.js",
-    "coveralls": "COVERALLS_REPO_TOKEN=REPO_TOKEN tap test/*.js"
+    "coveralls": "COVERALLS_REPO_TOKEN=m8BySBat6AaALacZWXaSBWhuVYOo6Yd7y tap test/*.js"
   },
   "repository": {
     "type": "git",

test/custom.js

@@ -18,7 +18,7 @@ test('custom', function(t) {
 
       result.url = path.join(base, path.basename(result.url))
     }, 'i'],
-    util.copy,
+    'copy',
   ])
   let body = '.a{ background-image: url(images/octocat_setup.png) url(images/octocat_fork.png); }'
   let expectedBody = [ '.a{background-image:url(', ')url(i/octocat_fork.png);}' ]