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+## gulp-sourcemaps  [![NPM version][npm-image]][npm-url] [![build status][travis-image]][travis-url] [![Test coverage][coveralls-image]][coveralls-url]
+
+### Usage
+
+#### Write inline source maps
+Inline source maps are embedded in the source file.
+
+Example:
+```javascript
+var gulp = require('gulp');
+var plugin1 = require('gulp-plugin1');
+var plugin2 = require('gulp-plugin2');
+var sourcemaps = require('gulp-sourcemaps');
+
+gulp.task('javascript', function() {
+  gulp.src('src/**/*.js')
+    .pipe(sourcemaps.init())
+      .pipe(plugin1())
+      .pipe(plugin2())
+    .pipe(sourcemaps.write())
+    .pipe(gulp.dest('dist'));
+});
+```
+
+All plugins between `sourcemaps.init()` and `sourcemaps.write()` need to have support for `gulp-sourcemaps`. You can find a list of such plugins in the [wiki](https://github.com/floridoo/gulp-sourcemaps/wiki/Plugins-with-gulp-sourcemaps-support).
+
+
+#### Write external source map files
+
+To write external source map files, pass a path relative to the destination to `sourcemaps.write()`.
+
+Example:
+```javascript
+var gulp = require('gulp');
+var plugin1 = require('gulp-plugin1');
+var plugin2 = require('gulp-plugin2');
+var sourcemaps = require('gulp-sourcemaps');
+
+gulp.task('javascript', function() {
+  gulp.src('src/**/*.js')
+    .pipe(sourcemaps.init())
+      .pipe(plugin1())
+      .pipe(plugin2())
+    .pipe(sourcemaps.write('../maps'))
+    .pipe(gulp.dest('dist'));
+});
+```
+
+#### Load existing source maps
+
+To load existing source maps, pass the option `loadMaps: true` to `sourcemaps.init()`.
+
+Example:
+```javascript
+var gulp = require('gulp');
+var plugin1 = require('gulp-plugin1');
+var plugin2 = require('gulp-plugin2');
+var sourcemaps = require('gulp-sourcemaps');
+
+gulp.task('javascript', function() {
+  gulp.src('src/**/*.js')
+    .pipe(sourcemaps.init({loadMaps: true}))
+      .pipe(plugin1())
+      .pipe(plugin2())
+    .pipe(sourcemaps.write())
+    .pipe(gulp.dest('dist'));
+});
+```
+
+#### Handle source files from different directories
+
+Use the `base` option on `gulp.src` to make sure all files are relative to a common base directory.
+
+Example:
+```javascript
+var gulp = require('gulp');
+var plugin1 = require('gulp-plugin1');
+var plugin2 = require('gulp-plugin2');
+var sourcemaps = require('gulp-sourcemaps');
+
+gulp.task('javascript', function() {
+gulp.src(['src/test.js', 'src/testdir/test2.js'], { base: 'src' })
+    .pipe(sourcemaps.init())
+      .pipe(plugin1())
+      .pipe(plugin2())
+    .pipe(sourcemaps.write('../maps'))
+    .pipe(gulp.dest('dist'));
+});
+```
+
+
+
+### Init Options
+
+- `loadMaps`
+  Set to true to load existing maps for source files. Supports the following:
+    - inline source maps
+    - source map files referenced by a `sourceMappingURL=` comment
+    - source map files with the same name (plus .map) in the same directory
+
+- `debug`
+  Set this to `true` to output debug messages (e.g. about missing source content).
+
+### Write Options
+
+- `addComment`
+
+  By default a comment containing / referencing the source map is added. Set this to `false` to disable the comment (e.g. if you want to load the source maps by header).
+
+  Example:
+  ```javascript
+  gulp.task('javascript', function() {
+    var stream = gulp.src('src/**/*.js')
+      .pipe(sourcemaps.init())
+        .pipe(plugin1())
+        .pipe(plugin2())
+      .pipe(sourcemaps.write('../maps', {addComment: false}))
+      .pipe(gulp.dest('dist'));
+  });
+  ```
+
+- `includeContent`
+
+  By default the source maps include the source code. Pass `false` to use the original files.
+
+  Including the content is the recommended way, because it "just works". When setting this to `false` you have to host the source files and set the correct `sourceRoot`.
+
+- `sourceRoot`
+
+  Set the path where the source files are hosted (use this when `includeContent` is set to `false`). This is an URL (or subpath) relative to the source map, not a local file system path. If you have sources in different subpaths, an absolute path (from the domain root) pointing to the source file root is recommended, or define it with a function.
+
+  Example:
+  ```javascript
+  gulp.task('javascript', function() {
+    var stream = gulp.src('src/**/*.js')
+      .pipe(sourcemaps.init())
+        .pipe(plugin1())
+        .pipe(plugin2())
+      .pipe(sourcemaps.write({includeContent: false, sourceRoot: '/src'}))
+      .pipe(gulp.dest('dist'));
+  });
+  ```
+
+  Example (using a function):
+  ```javascript
+  gulp.task('javascript', function() {
+    var stream = gulp.src('src/**/*.js')
+      .pipe(sourcemaps.init())
+        .pipe(plugin1())
+        .pipe(plugin2())
+      .pipe(sourcemaps.write({
+        includeContent: false,
+        sourceRoot: function(file) {
+          return '/src';
+        }
+       }))
+      .pipe(gulp.dest('dist'));
+  });
+  ```
+
+- `sourceMappingURLPrefix`
+
+  Specify a prefix to be prepended onto the source map URL when writing external source maps. Relative paths will have their leading dots stripped.
+
+  Example:
+  ```javascript
+  gulp.task('javascript', function() {
+    var stream = gulp.src('src/**/*.js')
+      .pipe(sourcemaps.init())
+        .pipe(plugin1())
+        .pipe(plugin2())
+      .pipe(sourcemaps.write('../maps', {
+        sourceMappingURLPrefix: 'https://asset-host.example.com/assets'
+      }))
+      .pipe(gulp.dest('public/scripts'));
+  });
+  ```
+
+  This will result in a source mapping URL comment like `sourceMappingURL=https://asset-host.example.com/assets/maps/helloworld.js.map`.
+
+- `sourceMappingURL`
+
+  If you need full control over the source map URL you can pass a function to this option. The output of the function must be the full URL to the source map (in function of the output file).
+
+  Example:
+  ```javascript
+  gulp.task('javascript', function() {
+    var stream = gulp.src('src/**/*.js')
+      .pipe(sourcemaps.init())
+        .pipe(plugin1())
+        .pipe(plugin2())
+      .pipe(sourcemaps.write('../maps', {
+        sourceMappingURL: function(file) {
+          return 'https://asset-host.example.com/' + file.relative + '.map';
+        }
+      }))
+      .pipe(gulp.dest('public/scripts'));
+  });
+  ```
+
+  This will result in a source mapping URL comment like `sourceMappingURL=https://asset-host.example.com/helloworld.js.map`.
+
+- `debug`
+
+  Set this to `true` to output debug messages (e.g. about missing source content).
+
+### Plugin developers only: How to add source map support to plugins
+
+- Generate a source map for the transformation the plugin is applying
+- **Important**: Make sure the paths in the generated source map (`file` and `sources`) are relative to `file.base` (e.g. use `file.relative`).
+- Apply this source map to the vinyl `file`. E.g. by using [vinyl-sourcemaps-apply](https://github.com/floridoo/vinyl-sourcemaps-apply).
+  This combines the source map of this plugin with the source maps coming from plugins further up the chain.
+- Add your plugin to the [wiki page](https://github.com/floridoo/gulp-sourcemaps/wiki/Plugins-with-gulp-sourcemaps-support)
+
+#### Example:
+
+```javascript
+var through = require('through2');
+var applySourceMap = require('vinyl-sourcemaps-apply');
+var myTransform = require('myTransform');
+
+module.exports = function(options) {
+
+  function transform(file, encoding, callback) {
+    // generate source maps if plugin source-map present
+    if (file.sourceMap) {
+      options.makeSourceMaps = true;
+    }
+
+    // do normal plugin logic
+    var result = myTransform(file.contents, options);
+    file.contents = new Buffer(result.code);
+
+    // apply source map to the chain
+    if (file.sourceMap) {
+      applySourceMap(file, result.map);
+    }
+
+    this.push(file);
+    callback();
+  }
+
+  return through.obj(transform);
+};
+```
+
+[npm-image]: https://img.shields.io/npm/v/gulp-sourcemaps.svg
+[npm-url]: https://www.npmjs.com/package/gulp-sourcemaps
+[travis-image]: https://img.shields.io/travis/floridoo/gulp-sourcemaps.svg
+[travis-url]: https://travis-ci.org/floridoo/gulp-sourcemaps
+[coveralls-image]: https://img.shields.io/coveralls/floridoo/gulp-sourcemaps.svg
+[coveralls-url]: https://coveralls.io/r/floridoo/gulp-sourcemaps?branch=master