adds sourcemap support

[madhums]

I followed the gulp-concat plugin and added support for sourcemaps.
I had to add concat-with-sourcemaps as a dep.

Please review and let me know if anything has to be changed.

[yocontra]

This is great but it won't work with other sourcemaps in the pipeline. Check out how gulp-concat does it - you need to use applySourceMaps

[tracker1]

@madhums I'd suggest following @contra's advice on this.. beyond that, it looks like the test are failing. Please add/update the tests accordingly.

[madhums]

@contra thanks, I will do it tonight. @tracker1 some tests are failing in the newly released iojs 3.0.0. It works well in the rest, but I will fix them.

[madhums]

@contra I added the Flush function where the sourcemapped content is pushed. I was thinking that concat-with-sourcemaps would do the applySourceMaps stuff (as this is how it is done in gulp-concat).

Let me know if this seems right. If not, should I use an ast parser and then applySourceMaps?

I tested the above in the following task, it seems to work fine.

var header = require('gulp-header');

return gulp.src(files)
  .pipe(sourcemaps.init())
    .pipe(concat('app.js'))
    .pipe(header('window.locales = { en: {} }'))
    .pipe(gulpif(minify, uglify({ mangle: false })))
    .pipe(header(banner, { pkg: pkg }))
  .pipe(sourcemaps.write('./'))
  .pipe(gulp.dest(dist + '/'));

[yocontra]

Ah yeah, concat-with-sourcemaps does handle that - my bad. LGTM

[madhums]

Ok great! @tracker1 can you review the PR?

[tracker1]

LGTM...

[tracker1]

closes #7

[tracker1]

@madhums Thanks for your great work on this.

[madhums]

👍