lasso-js/karma-lasso

'use strict';
var istanbul = require('istanbul-lib-instrument');
var through = require('through');
var minimatch = require('minimatch');
var fs = require('fs-extra');
var path = require('path');

var defaultIgnore = [
    'node_modules/**',
    'test/**',
    'tests/**',
    '!**/*.js'
];
module.exports = function(name) {
    // get the config
    var coverageConfig = fs.readJsonSync(process.argv[2]).coverage || {};
    // get the included files
    var files = [].concat(coverageConfig.files || []);
    // get the ignored files
    var ignore = coverageConfig.defaultIgnore === false ? [] : defaultIgnore;
    ignore = ignore.concat(coverageConfig.ignore || []);
    function transform(file) {
        var relativePath = path.relative(process.cwd(), file);
        // if the file is to be ignored, do not instrument it
        if (ignore.some(minimatch.bind(null, relativePath))) {
            return through();
        }
        // if the file pattern is specified, test the files on it.
        if (files.length && !files.some(minimatch.bind(null, relativePath))) {
            return through();
        }

        // instrument the non ignored files
        var instrumenter = istanbul.createInstrumenter(coverageConfig.instrumenterConfig || {});
        var data = '';
        return through(function(buf) {
            data += buf;
        }, function() {
            var self = this;
            instrumenter.instrument(data, file, function(err, code) {
                if (!err) {
                    self.queue(code);
                } else {
                    self.emit('error', err);
                }
                self.queue(null);
            });
        });
    }

    if (typeof name === 'string') {
        return transform(name);
    }
    return transform;
};