gistfile1.txt

// ...
    concat: {
      core: {
        src: ['src/brook.js','src/brook/util.js','src/brook/lambda.js','src/brook/channel.js','src/brook/model.js'],
        dest: 'build/brook-core.js'
      },
      htp: {
        src: ['<file_enclose_with_namespace:brook.view.htmltemplate.core:lib/html-template-core.js>'],
        dest: 'build/brook-view-htmltemplate-core.js'
      },
      compat: {
        src: ['<concat_nest:core>','<concat_nest:htp>','src/brook/view/htmltemplate.js','src/brook/dom/compat.js','src/brook/dom/gateway.js','src/brook/widget.js'],
        dest: 'build/brook.js'
      },
      mobile: {
        src: ['<concat_nest:compat>','src/brook/mobile/dom/event.js'],
        dest: 'build/brook-mobile.js'
      }
    },
// ...

  grunt.registerHelper('concat_nest', function(name) {
    return grunt.helper('concat', grunt.file.expandFiles(grunt.config.get('concat.'+name+'.src')));
  });