gruntfile.js

var _ = require('underscore');
var libumd = require('libumd');

var findDuplicates = function (sourceArray, prop) {
	var duplicates = [];
	var groupedByCount = _.countBy(sourceArray, function (item) {
		return item[prop];
	});

	for (var name in groupedByCount) {
		if (groupedByCount[name] > 1) {
			var whereClause = [];
			whereClause[prop] = name;
			_.where(sourceArray, whereClause).map(function (item) {
				duplicates.push(item);
			});
		}
	}

	return _.uniq(_.pluck(duplicates, prop));
};

var getJSON = function (grunt) {
	var content = '';
	try {
		content = grunt.file.readJSON("data.json");
	} catch (e) {
		grunt.fail.fatal("data.json is not valid JSON. Error: " + e);
	}
	return content;
};


module.exports = function (grunt) {

	function validate () {
		var content = getJSON(grunt);

		// check country names and country shortcodes are unique
		var duplicateCountryNames = findDuplicates(content, 'countryName');
		if (duplicateCountryNames.length > 0) {
			grunt.fail.fatal('The country names are not unique - duplicates: ' + duplicateCountryNames);
		}
		var duplicateCountryShortCodes = findDuplicates(content, 'countryShortCode');
		if (duplicateCountryShortCodes.length > 0) {
			grunt.fail.fatal('The country short codes are not unique - duplicates: ' + duplicateCountryShortCodes);
		}

		// now check region names and short codes are unique for each country
		content.forEach(function (countryData) {
			var duplicateRegionNames = findDuplicates(countryData.regions, 'name');
			if (duplicateRegionNames.length > 0) {
				grunt.fail.fatal('The region names for ' + countryData.countryName + ' are not unique - duplicates: ' + duplicateRegionNames);
			}
			var duplicateRegionShortCodes = findDuplicates(countryData.regions, 'shortCode');
			if (duplicateRegionShortCodes.length > 0) {
				grunt.fail.fatal('The region names for ' + countryData.countryName + ' are not unique - duplicates: ' + duplicateRegionShortCodes);
			}
		});
		console.log("PASS!");
	}


	function findIncomplete () {
		var content = getJSON(grunt);

		var incompleteCountries = [];
		content.forEach(function (countryData) {
			for (var i = 0; i < countryData.regions.length; i++) {
				if (!_.has(countryData.regions[i], 'shortCode')) {
					incompleteCountries.push(countryData.countryName);
					break;
				}
			}
		});

		if (incompleteCountries.length > 0) {
			console.log('\nThe following countries are missing region short codes: \n-', incompleteCountries.join('\n- '));
			console.log('\n(' + incompleteCountries.length + ' countries)');
		} else {
			console.log('All regions now have short codes. Nice!');
		}
	}

	function umdify () {
		var content = getJSON(grunt);

		var output = libumd("return " + JSON.stringify(content, null, 2) + ";", {
			globalAlias: "countryRegionData",
			indent: 2
		});

		grunt.file.write("data.js", output);

		console.log('Successfully made a UMD module!');
	}

	grunt.registerTask("default", ['validate']);
	grunt.registerTask("validate", validate);
	grunt.registerTask("findIncomplete", findIncomplete);
	grunt.registerTask("umdify", umdify);
};