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var fs = require('fs');

var _ = require('lodash');

// Split array to smaller arrays containing n elements at max

function groupToElements(array, n) {

var lists = _.groupBy(array, function(element, index){

return Math.floor(index / n);

});

return _.toArray(lists);

}

function endsWith(str, suffix) {

return str.indexOf(suffix, str.length - suffix.length) !== -1;

}

// Setup karma configuration dynamically to run browsers sequentially

// https://github.com/karma-runner/karma-sauce-launcher/issues/8

var MAXIMUM_CONCURRENT_SAUCE = 3;

var sauceBrowsers = require('./saucelabs-browsers');

var browserGroups = groupToElements(Object.keys(sauceBrowsers), MAXIMUM_CONCURRENT_SAUCE);

var karmaConfig = {

options: {

configFile: 'karma.conf.js'

}

};

_.each(browserGroups, function(group, index) {

karmaConfig['sauce' + index] = {

browsers: group

}

});

module.exports = function(grunt) {

grunt.initConfig({

pkg: grunt.file.readJSON('package.json'),

jshint: {

files: ['src/*.js', 'test/**/*.js'],

options: {

globals: {

jQuery: true,

module: true

}

}

},

shell: {

stageMinified: {

options: {

stdout: true,

// If minified files do not change on release,

// git command fails

failOnError: false

},

command: 'git add dist/progressbar.js dist/progressbar.min.js dist/progressbar.min.js.map'

},

browserifyDevelopment: {

options: {

stdout: true

},

command: 'browserify src/main.js -o dist/progressbar.js --standalone ProgressBar'

},

browserifyMinified: {

options: {

stdout: true

},

// The output file is minified by uglifyjs later.

command: 'browserify src/main.js -o dist/progressbar.min.js --standalone ProgressBar'

},

watchifyLocalDev: {

options: {

stdout: true

},

command: 'watchify local-dev/main.js -o local-dev/bundle.js --debug --verbose'

},

release: {

options: {

stdout: true

},

command: function(bump) {

bump = bump || 'patch';

return './tools/release.js ' + bump;

}

},

karma: {

options: {

stdout: true

},

// This will run tests in Sauce Lab

command: './node_modules/karma/bin/karma start'

},

testem: {

options: {

stdout: true

},

// This will run tests in all local browsers available/detected

command: 'testem ci -R dot -l chrome'

}

},

// Uglify must be run after browserify

uglify: {

progressbar: {

options: {

sourceMap: true

},

files: {

'dist/progressbar.min.js': ['dist/progressbar.min.js']

}

}

},

// Calculated dynamically above

karma: karmaConfig

});

grunt.loadNpmTasks('grunt-contrib-jshint');

grunt.loadNpmTasks('grunt-contrib-uglify');

grunt.loadNpmTasks('grunt-shell');

grunt.loadNpmTasks('grunt-karma');

grunt.registerTask('watch', function() {

grunt.task.run(['shell:watchifyLocalDev']);

});

grunt.registerTask('stageMinified', function() {

grunt.task.run(['shell:stageMinified']);

});

// Build distributables to dist folder

grunt.registerTask('build', [

'shell:browserifyDevelopment',

'shell:browserifyMinified',

'uglify:progressbar'

]);

grunt.registerTask('test', ['shell:testem']);

// Run multiple tests serially, but continue if one of them fails.

// Adapted from http://stackoverflow.com/questions/16487681/gruntfile-getting-error-codes-from-programs-serially

grunt.registerTask('sauce', function() {

var done = this.async();

var tasks = {};

_.each(browserGroups, function(group, index) {

tasks['karma:sauce' + index] = 0;

});

var success = true;

grunt.util.async.forEachSeries(Object.keys(tasks), function(task, next) {

grunt.util.spawn({

// Use grunt to spawn

grunt: true,

args: [task],

// Print to the same stdout

opts: { stdio: 'inherit' }

}, function(err, result, code) {

tasks[task] = code;

if (code !== 0) {

success = false;

}

next();

});

}, function() {

done(success);

});

});

// Test, build, and release library to public

grunt.registerTask('release', function(bump) {

bump = bump || 'patch';

grunt.task.run([

'jshint',

'test',

'build',

'stageMinified',

'shell:release:' + bump

]);

});

};