add standalone processing functionality

src/index.js

@@ -37,12 +37,12 @@ const plugins = new Map([
 
 const kireiCss = postcss.plugin('kirei-css', (custom = {}) => {
   const instance = postcss()
-
   plugins.forEach((opts, plugin) => instance.use(require(plugin)(
     custom[plugin] ? merge(opts, custom[plugin]) : opts
   )))
-
   return instance
 })
 
+kireiCss.process = (css, opts) => postcss([kireiCss(opts)]).process(css)
+
 export default kireiCss

test/as-plugin.js

@@ -0,0 +1,20 @@
+// utils ---------------------------------------------------
+
+import assert from 'assert'
+import postcss from 'postcss'
+import kireiCss from '../src'
+
+// tests ---------------------------------------------------
+
+const processor = postcss([kireiCss])
+
+const expected =
+`body {
+  background: red;
+}`
+
+exports['as-plugin'] = function* customOpts() {
+  const raw = postcss.parse('body{background:red;}')
+  const actual = yield processor.process(raw)
+  assert.equal(actual.css, expected)
+}

test/custom-opts.js

@@ -3,7 +3,6 @@
 import path from 'path'
 import assert from 'assert'
 import fs from 'mz/fs'
-import postcss from 'postcss'
 import kireiCss from '../src'
 
 // tests ---------------------------------------------------
@@ -16,14 +15,12 @@ const opts = {
   },
 }
 
-const processor = postcss([kireiCss(opts)])
-
 const read = file =>
   fs.readFile(path.resolve('test', 'fixtures', 'custom-opts', `${file}.css`), 'utf8')
 
 exports['custom-opts'] = function* customOpts() {
   const raw = yield read('in')
   const expected = yield read('out')
-  const actual = yield processor.process(raw)
+  const actual = yield kireiCss.process(raw, opts)
   assert.equal(actual.css, expected)
 }

test/runner.js

@@ -3,13 +3,10 @@
 import path from 'path'
 import assert from 'assert'
 import fs from 'mz/fs'
-import postcss from 'postcss'
 import kireiCss from '../src'
 
 // tests ---------------------------------------------------
 
-const processor = postcss([kireiCss])
-
 const read = (dir, file) =>
   fs.readFile(path.resolve('test', 'cases', dir, `${file}.css`), 'utf8')
 
@@ -18,7 +15,7 @@ fs.readdirSync(path.resolve('test', 'cases'))
     exports[test] = function* testGenerator() {
       const raw = yield read(test, 'in')
       const expected = yield read(test, 'out')
-      const actual = yield processor.process(raw)
+      const actual = yield kireiCss.process(raw)
       assert.equal(actual.css, expected)
     }
   })

todo.txt

@@ -1,6 +1,5 @@
-- obviate postcss if not using other plugins (webpack compat?)
-- linting
 - ci
 - readme
 - changelog
 - npm
+- check webpack compatibility