Gruntfile.js

'use strict';

// our wrapper function (required by grunt and its plugins)
// all configuration goes inside this function
module.exports = function(grunt) {

    // ===========================================================================
    // CONFIGURE GRUNT ===========================================================
    // ===========================================================================
    grunt.initConfig({

        responsive_images: {
            dev: {
                options: {
                    engine: 'im',
                    separator: '',
                    sizes: [{
                        height: 320,
                        rename: false
                    }]
                },
                files: [{
                    expand: true,
                    src: ['flickr/*.{jpg,gif,png}'],
                    // Use the current working directory
                    cwd: '',
                    dest: 'flickr/thumbnails/'
                }]
            }
        },
        clean: {
            tests: ['flickr/*.jpg', 'flickr/thumbnails/flickr/*.jpg'],
        },
        downloadfile: {
            options: {
                dest: 'flickr'
            },
            files: [
                    "https://c1.staticflickr.com/1/591/22665222766_07524ca21a_k.jpg",
                    "https://farm4.staticflickr.com/3746/9503927685_970b5e141b_k_d.jpg",
                    "https://farm1.staticflickr.com/661/21230969582_33e91e2a9a_o_d.jpg",
                    "https://c2.staticflickr.com/8/7426/12233323463_57606d8e87_k.jpg",
                    "https://farm1.staticflickr.com/648/20938457876_4d0924e380_o_d.jpg",
                    "https://c1.staticflickr.com/9/8820/16523586334_4d22f1754b_k.jpg",
                    "https://farm6.staticflickr.com/5688/21597873406_d19b851a96_o_d.jpg",
                    "https://farm4.staticflickr.com/3876/14634078309_f77e77d6b9_o_d.jpg",
                    "https://farm4.staticflickr.com/3860/14632678619_eb4f89ef85_o_d.jpg",
                    "https://farm4.staticflickr.com/3844/14626558247_6aaa566397_o_d.jpg",
                    "https://farm8.staticflickr.com/7425/14182933691_af44ff2a43_o_d.jpg",
                    "https://farm4.staticflickr.com/3877/14847119920_7e5e9398e9_o_d.jpg",
                    "https://farm9.staticflickr.com/8526/8546879452_2e097547a6_o_d.jpg",
                    "https://farm6.staticflickr.com/5578/14847291760_a1945131e6_o_d.jpg",
                    "https://farm6.staticflickr.com/5595/15030728651_753a31e3ca_o_d.jpg",
                    "https://farm4.staticflickr.com/3869/14460157987_e0892869e2_o_d.jpg",
                    "https://farm4.staticflickr.com/3947/15426357418_9976b269b0_o_d.jpg",
                    "https://farm6.staticflickr.com/5817/21608154473_74bd18c61f_o_d.jpg",
                    "https://farm6.staticflickr.com/5324/16622294523_67e373a118_o_d.jpg",
                    "https://farm4.staticflickr.com/3734/11368642323_b4be377644_o_d.jpg",
                    "https://farm4.staticflickr.com/3912/15030746921_c030b23b2b_o_d.jpg",
                    "https://farm4.staticflickr.com/3899/14847155059_33ccd392b5_o_d.jpg",
                    "https://c1.staticflickr.com/1547/24151972210_081aeaf891_o_d.jpg",
                    "https://c1.staticflickr.com/1585/24339263532_4ddae26189_o_d.jpg",
                    "https://c1.staticflickr.com/1524/24365150991_39fc7c5b35_o_d.jpg",
                    "https://c1.staticflickr.com/1659/24079886189_8a475ff9cd_o_d.jpg",
                    "https://farm4.staticflickr.com/3689/13202443445_00c76d4caa_o_d.jpg",
                    "https://farm4.staticflickr.com/3679/11829226443_ef2a8482d1_o_d.jpg",
                    "https://farm3.staticflickr.com/2939/14486898640_a42a82869b_o_d.jpg",
                    "https://farm8.staticflickr.com/7476/15805694576_e56e29784e_o_d.jpg",
                    "https://farm3.staticflickr.com/2817/9174896564_88ec346440_o_d.jpg"
            ]
        }

    });

    // These plugins provide necessary tasks.
    grunt.loadNpmTasks('grunt-downloadfile');
    grunt.loadNpmTasks('grunt-contrib-clean');
    grunt.loadNpmTasks('grunt-responsive-images');

    grunt.registerTask('default', ['clean', 'downloadfile', "responsive_images"]);

};