Merge pull request #49 from sinklair/file-extension-option

Added output file extension option

README.md

@@ -55,3 +55,18 @@ gulp.task('default', function () {
     .pipe(gulp.dest('./html'))
 })
 ```
+
+> If you want to override the default file extension that is output use `fileExt`
+
+```javascript
+const gulp = require('gulp')
+const mjml = require('gulp-mjml')
+
+const mjmlEngine = require('mjml')
+
+gulp.task('default', function () {
+  return gulp.src('./test.mjml')
+    .pipe(mjml(mjmlEngine, {minify: true, fileExt: ".txt"}))
+    .pipe(gulp.dest('./html'))
+})
+```

src/index.js

@@ -47,7 +47,7 @@ module.exports = function mjml(mjmlEngine, options) {
 
       // [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues
       output.contents = Buffer.from(render.html);
-      output.path = replaceExt(file.path.toString(), ".html");
+      output.path = replaceExt(file.path.toString(), localOptions.fileExt || ".html");
       this.push(output);
     }
     return callback();