Add usage example of conventional streams

- Refs #2

README.md

@@ -91,6 +91,22 @@ gulp.task('sassdoc', function () {
 });
 ```
 
+```js
+var fs = require('fs');
+var vfs = require('vinyl-fs');
+var source = require('vinyl-source-stream');
+var rename = require('gulp-rename');
+
+fs.createReadStream('./file.sass')
+  .pipe(source('file.sass'))
+  .pipe(converter({
+    from: 'sass',
+    to: 'scss',
+  }))
+  .pipe(rename('file.scss'))
+  .pipe(vfs.dest('./'));
+```
+
 ## Credits
 
 * [Pascal Duez](https://twitter.com/pascalduez)

package.json

@@ -72,6 +72,7 @@
     "runtime": "mkdir -p bin && cp node_modules/traceur/bin/traceur-runtime.js bin/traceur-runtime.js",
     "lint": "eslint lib/*.js",
     "test": "tape test/*.test.js | faucet",
+    "pretest": "$npm_package_scripts_prepublish",
     "prepublish": "npm run dist && npm run runtime",
     "inspect": "node test/inspect.js"
   }

test/inspect.js

@@ -1,7 +1,10 @@
 'use strict';
 
-var through = require('through2');
+var fs = require('fs');
 var vfs = require('vinyl-fs');
+var through = require('through2');
+var source = require('vinyl-source-stream');
+var rename = require('gulp-rename');
 
 require('traceur-runner');
 var converter = require('../lib');
@@ -21,3 +24,14 @@ vfs.src('./test/fixture/input/**/*.+(sass|scss|css)')
   .on('error', console.error)
   .pipe(inspect())
   .pipe(vfs.dest('./test/output'));
+
+fs.createReadStream('./test/fixture/input/sass/one.sass')
+  .pipe(source('one.sass'))
+  .pipe(converter({
+    from: 'sass',
+    to: 'scss',
+  }))
+  .on('error', console.error)
+  .pipe(inspect())
+  .pipe(rename('one.scss'))
+  .pipe(vfs.dest('./test'));