grunt-karma-sonar/tasks/coverage.js

(function () {
    'use strict';

    module.exports = function (grunt) {
        var glob = require("glob"),
            path = require('path');

        /**
         * Merge all coverage results.
         * Because the sources will be copied we need to fix the paths for coverage
         *
         * #1 iterate over each location .
         * #2 replace the suffix
         * #3 append the tests to the result.
         * #4 write merged results to file.
         */
        function merge(locations, outputFile, type) {
            var CURRENT_PATH = '.',
                resultContent = '';

            // #1 
            locations.forEach(function (l) {
                var cwd = (l.cwd || CURRENT_PATH) + path.sep;

                if (l.reports[type]) {
                    glob.sync(l.reports[type], {cwd: cwd, root: '/'}).forEach(function (file) {
                        // #2
                        var content = grunt.file.read(cwd + file).
                            replace(new RegExp('(SF:)(.*?' + l.src + ')(.*)', 'g'), '$1.' + path.sep + l.src + '$3');

                        // #3
                        resultContent = resultContent.concat(content);
                    });
                } else {
                    if (type === 'itCoverage') {
                        grunt.log.warn('No integration coverage report has been specified');
                    } else {
                        grunt.log.warn('No coverage report has been specified');
                    }
                }
            });
            // #4
            grunt.file.write(outputFile, resultContent, {encoding: 'utf8'});
        }

        return {
            merge: merge
        };

    };
})();