Updated version of a grunt compile script for livescript. Original from Micah Smith. http://www.allampersandall.com/2012/08/nodejs-gruntjs-livescript-mocha-example

grunt-livescript.js

 module.exports = function(grunt) {
 
  // LIVESCRIPT ----------------------------
  var log = grunt.log;
  var growl = require('growl')

  function handleResult(from, dest, err, stdout, code, done) {
    if(err){
      growl('ERROR', stdout);
      log.writeln(from + ': failed to compile to ' + dest + '.');
      log.writeln(stdout);
      done(false);
    }else{
      log.writeln(from + ': compiled to ' + dest + '.');
      done(true);
    }
  };

  var livescript_dir_to_dir = function(fromdir, dest, done) {
    var args = {
      cmd: 'livescript',
      args: [ '--compile', '--output', dest, fromdir ]
    };
    runHelper(args, function(err, stdout, code){
      handleResult(fromdir, dest, err, stdout, code, done);
    });
  }

  grunt.registerMultiTask('livescript', 'compile livescripts', function() {
    var done = this.async();
    var files = this.data.files;
    var dir = this.data.dir;
    var dest = this.data.dest;
    // ex: ./coffee -> ./js
    if(dir) {
      // if destination was not defined, compile to same dir
      if(!dest) {
        dest = dir;
      }
      livescript_dir_to_dir(dir, dest, done);
      return;
    }

    // ex: [ '1.coffee', '2.coffee' ] -> foo.js
    if(files) {
      livescript_multi_to_one(files, dest, done);
      return;
    }
  });

  var exec = require('child_process').exec;

  // child_process.exec bridge
  var runHelper = function(opts, done) {
    console.log("opts ", opts.args);
    var command = opts.cmd + ' ' + opts.args.join(' ');
    exec(command, opts.opts, function(code, stdout, stderr) {
      if(!done){
        return;
      }
      if(code === 0) {
        done(null, stdout, code);
      } else {
        done(code, stderr, code);
      }
    });
  }


  grunt.initConfig({
    watch: {
      dist1: {
        files:"app/src/**/*.ls",
        tasks:"livescript"
      },
      dist2: {
        files:"tests-src/**/*.ls",
        tasks:"livescript"
      },

    },
    livescript:{
        dist1:{
          dir:"tests-src/"
          ,dest:"tests/"
        },
        dist2:{
          dir:"tests-src/"
          ,dest:"tests/"
        }
    }
  });
  
  grunt.registerTask('lsapp', ['watch', 'livescript']);
  grunt.loadNpmTasks('grunt-contrib-watch');

};