import: fix prefix issue

Signed-off-by: Yoshua Wuyts <i@yoshuawuyts.com>

Closes #46

package.json

@@ -30,7 +30,8 @@
     "postcss": "^5.0.10",
     "postcss-prefix": "^1.0.3",
     "resolve": "^1.1.7",
-    "through2": "^2.0.0"
+    "through2": "^2.0.0",
+    "xtend": "^4.0.1"
   },
   "devDependencies": {
     "browserify": "^13.0.0",

test/import.js

@@ -16,7 +16,6 @@ test('import', function (t) {
   })
   b.transform(sheetify, {
     basedir: path.join(__dirname, 'plugins'),
-    use: [ [ 'sheetify-cssnext', { sourcemap: false } ] ],
     out: concat(function (buf) {
       const res = String(buf).trim()
       t.equal(res, expected, 'package was imported')

transform.js

@@ -6,6 +6,7 @@ const falafel = require('falafel')
 const resolve = require('resolve')
 const assert = require('assert')
 const mkdirp = require('mkdirp')
+const xtend = require('xtend')
 const path = require('path')
 const fs = require('fs')
 
@@ -26,6 +27,8 @@ function transform (filename, opts) {
   const nodes = []
   var mname = null
 
+  opts = xtend(opts)
+
   // argv parsing
   if (opts.o) opts.out = opts.o
   if (opts.out) {
@@ -123,9 +126,14 @@ function transform (filename, opts) {
     if (node.type === 'CallExpression' &&
     node.callee && node.callee.type === 'Identifier' &&
     node.callee.name === mname) {
+      // determine path
+      // - check if module import
+      // - don't prefix by default if module import
+      // - check if local file
       const resolvePath = cssResolve(node.arguments[0].value, opts.basedir)
       const fnp = resolvePath ||
         path.join(path.dirname(filename), node.arguments[0].value)
+      if (resolvePath) opts.global = true
       const fnCss = fs.readFileSync(fnp, 'utf8').trim()
 
       // read optional arguments passed in to node