stackdot/sketch-preview

module.exports = function( ops ){

    const gulp = ops.gulp
    const config = ops.config
    const env = ops.env
    const browserSync = ops.browserSync

    if(!config.tasks.images) return

    const lodash             = require('lodash')
    const imagemin             = require('gulp-imagemin')
    const path                 = require('path')
    const notify             = require('gulp-notify')
    const changed             = require('gulp-changed')


    const sources = lodash.map(config.tasks.images.src, function( src ){
        return path.join( src )
    })

    const paths = {
        src: sources,
        dest: path.resolve(config.dest, config.tasks.images.dest)
    }

    const imagesTask = function(){
        const PROD = Boolean.parse(process.env.prod)
        let stream = gulp.src(paths.src)
            .pipe(changed(paths.dest)) // Ignore unchanged files
            .pipe(imagemin({
                optimizationLevel: 5,
                progressive: true,
                interlaced: true
            })) // Optimize
            .pipe(gulp.dest(paths.dest))
        if(!PROD)
            stream = stream.pipe(browserSync.stream())
        return stream
    }

    gulp.task('images', imagesTask)
    gulp.task('images:watch', ['images'], function(){
        return gulp.watch( paths.src, ['images'] )
    })
    return imagesTask

}