/src/node-loaders/coffee-script.js

var fs = require("fs"),
    path = require("path");

module.exports = function(blanket){
    var coffeeScript = require("coffee-script");
    var oldLoaderCS = require.extensions['.coffee'];

    require.extensions['.coffee'] = function(localModule, filename) {
        
        var pattern = blanket.options("filter");
        filename = blanket.normalizeBackslashes(filename);
        if (blanket.matchPattern(filename,pattern)){

            var content = fs.readFileSync(filename, 'utf8');
            content = coffeeScript.compile(content);
            blanket.instrument({
                inputFile: content,
                inputFileName: filename
            },function(instrumented){
                var baseDirPath = blanket.normalizeBackslashes(path.dirname(filename))+'/.';
                try{
                    instrumented = instrumented.replace(/require\s*\(\s*("|')\./g,'require($1'+baseDirPath);
                    localModule._compile(instrumented, filename);
                }
                catch(err){
                    console.log("Error parsing instrumented code: "+err);
                }
            });
        }else{
            oldLoaderCS(localModule,filename);
        }
    };
};