gulp = require('gulp')
newer = require('gulp-newer')
unretina = require('gulp-unretina')
rename = require('gulp-rename')

###*
# Transforms the path from e.g. asset_2x.png to asset.png
# @param {String} suffix The suffix to remove
###
transformPath = (suffix) ->
  (relativePath) ->
    p = relativePath.split('.')
    p[0].substring(0, p[0].length - suffix.length) + '.' + p[1]

gulp.task 'unretina', ->
  gulp.src('./src/**/*_2x.{png,jpg}')
    .pipe(newer(
      dest: './dist'
   	  map: transformPath('_2x')
    ))
    .pipe unretina(suffix: '_2x')
    .pipe gulp.dest('./dist')