yeoman webappでJadeを使う

`yeoman webapp`はSassとCoffeeScriptを標準でサポートしてくれてますが
どうせなのでJadeも使えるようにします。

```js:Gruntfile.js
// Generated on 2013-06-01 using generator-webapp 0.2.2
// Modified by 2k0ri
'use strict';
var LIVERELOAD_PORT = 35729;
var lrSnippet = require('connect-livereload')({port: LIVERELOAD_PORT});
var mountFolder = function (connect, dir) {
    return connect.static(require('path').resolve(dir));
};

// # Globbing
// for performance reasons we're only matching one level down:
// 'test/spec/{,*/}*.js'
// use this if you want to recursively match all subfolders:
// 'test/spec/**/*.js'

module.exports = function (grunt) {
    // load all grunt tasks
    require('matchdep').filterDev('grunt-*').forEach(grunt.loadNpmTasks);

    // configurable paths
    var yeomanConfig = {
        app: 'app',
        dist: 'dist'
    };

    grunt.initConfig({
        yeoman: yeomanConfig,
        watch: {
            options: {
                nospawn: true
            },
            coffee: {
                files: ['<%= yeoman.app %>/scripts/{,*/}*.coffee'],
                tasks: ['coffee:dist']
            },
            coffeeTest: {
                files: ['test/spec/{,*/}*.coffee'],
                tasks: ['coffee:test']
            },
            compass: {
                files: ['<%= yeoman.app %>/styles/{,*/}*.{scss,sass}'],
                tasks: ['compass:server']
            },
            jade: {
                files: ['<%= yeoman.app %>/{,*/}*.jade'],
                tasks: ['jade:dev']
            },
            livereload: {
                options: {
                    livereload: LIVERELOAD_PORT
                },
                files: [
                    '<%= yeoman.app %>/*.html',
                    '{.tmp,<%= yeoman.app %>}/styles/{,*/}*.css',
                    '{.tmp,<%= yeoman.app %>}/scripts/{,*/}*.js',
                    '<%= yeoman.app %>/images/{,*/}*.{png,jpg,jpeg,gif,webp,svg}'
                ]
            }
        },
        connect: {
            options: {
                port: 9000,
                // change this to '0.0.0.0' to access the server from outside
                hostname: 'localhost'
            },
            livereload: {
                options: {
                    middleware: function (connect) {
                        return [
                            mountFolder(connect, '.tmp'),
                            mountFolder(connect, yeomanConfig.app),
                            lrSnippet
                        ];
                    }
                }
            },
            test: {
                options: {
                    middleware: function (connect) {
                        return [
                            mountFolder(connect, '.tmp'),
                            mountFolder(connect, 'test')
                        ];
                    }
                }
            },
            dist: {
                options: {
                    middleware: function (connect) {
                        return [
                            mountFolder(connect, yeomanConfig.dist)
                        ];
                    }
                }
            }
        },
        open: {
            server: {
                path: 'http://localhost:<%= connect.options.port %>'
            }
        },
        clean: {
            dist: {
                files: [{
                    dot: true,
                    src: [
                        '.tmp',
                        '<%= yeoman.dist %>/*',
                        '!<%= yeoman.dist %>/.git*'
                    ]
                }]
            },
            server: '.tmp'
        },
        jade: {
            dev: {
                options: {
                    pretty: true
                },
                files: [{
                    expand: true,
                    src: '{,*/}[^_]*.jade',
                    ext: '.html'
                }]
            }
        },
        jshint: {
            options: {
                jshintrc: '.jshintrc'
            },
            all: [
                'Gruntfile.js',
                '<%= yeoman.app %>/scripts/{,*/}*.js',
                '!<%= yeoman.app %>/scripts/vendor/*',
                'test/spec/{,*/}*.js'
            ]
        },
        mocha: {
            all: {
                options: {
                    run: true,
                    urls: ['http://localhost:<%= connect.options.port %>/index.html']
                }
            }
        },
        coffee: {
            dist: {
                files: [{
                    expand: true,
                    cwd: '<%= yeoman.app %>/scripts',
                    src: '{,*/}*.coffee',
                    dest: '.tmp/scripts',
                    ext: '.js'
                }]
            },
            test: {
                files: [{
                    expand: true,
                    cwd: 'test/spec',
                    src: '{,*/}*.coffee',
                    dest: '.tmp/spec',
                    ext: '.js'
                }]
            }
        },
        compass: {
            options: {
                sassDir: '<%= yeoman.app %>/styles',
                cssDir: '.tmp/styles',
                generatedImagesDir: '.tmp/images/generated',
                imagesDir: '<%= yeoman.app %>/images',
                javascriptsDir: '<%= yeoman.app %>/scripts',
                fontsDir: '<%= yeoman.app %>/styles/fonts',
                importPath: '<%= yeoman.app %>/bower_components',
                httpImagesPath: '/images',
                httpGeneratedImagesPath: '/images/generated',
                relativeAssets: false
            },
            dist: {},
            server: {
                options: {
                    debugInfo: true
                }
            }
        },
        // not used since Uglify task does concat,
        // but still available if needed
        /*concat: {
            dist: {}
        },*/
        // not enabled since usemin task does concat and uglify
        // check index.html to edit your build targets
        // enable this task if you prefer defining your build targets here
        /*uglify: {
            dist: {}
        },*/
        rev: {
            dist: {
                files: {
                    src: [
                        '<%= yeoman.dist %>/scripts/{,*/}*.js',
                        '<%= yeoman.dist %>/styles/{,*/}*.css',
                        '<%= yeoman.dist %>/images/{,*/}*.{png,jpg,jpeg,gif,webp}',
                        '<%= yeoman.dist %>/styles/fonts/*'
                    ]
                }
            }
        },
        useminPrepare: {
            options: {
                dest: '<%= yeoman.dist %>'
            },
            html: '<%= yeoman.app %>/index.html'
        },
        usemin: {
            options: {
                dirs: ['<%= yeoman.dist %>']
            },
            html: ['<%= yeoman.dist %>/{,*/}*.html'],
            css: ['<%= yeoman.dist %>/styles/{,*/}*.css']
        },
        imagemin: {
            dist: {
                files: [{
                    expand: true,
                    cwd: '<%= yeoman.app %>/images',
                    src: '{,*/}*.{png,jpg,jpeg}',
                    dest: '<%= yeoman.dist %>/images'
                }]
            }
        },
        svgmin: {
            dist: {
                files: [{
                    expand: true,
                    cwd: '<%= yeoman.app %>/images',
                    src: '{,*/}*.svg',
                    dest: '<%= yeoman.dist %>/images'
                }]
            }
        },
        cssmin: {
            dist: {
                files: {
                    '<%= yeoman.dist %>/styles/main.css': [
                        '.tmp/styles/{,*/}*.css',
                        '<%= yeoman.app %>/styles/{,*/}*.css'
                    ]
                }
            }
        },
        htmlmin: {
            dist: {
                options: {
                    /*removeCommentsFromCDATA: true,
                    // https://github.com/yeoman/grunt-usemin/issues/44
                    //collapseWhitespace: true,
                    collapseBooleanAttributes: true,
                    removeAttributeQuotes: true,
                    removeRedundantAttributes: true,
                    useShortDoctype: true,
                    removeEmptyAttributes: true,
                    removeOptionalTags: true*/
                },
                files: [{
                    expand: true,
                    cwd: '<%= yeoman.app %>',
                    src: '*.html',
                    dest: '<%= yeoman.dist %>'
                }]
            }
        },
        // Put files not handled in other tasks here
        copy: {
            dist: {
                files: [{
                    expand: true,
                    dot: true,
                    cwd: '<%= yeoman.app %>',
                    dest: '<%= yeoman.dist %>',
                    src: [
                        '*.{ico,txt}',
                        '.htaccess',
                        'images/{,*/}*.{webp,gif}',
                        'styles/fonts/*'
                    ]
                }, {
                    expand: true,
                    cwd: '.tmp/images',
                    dest: '<%= yeoman.dist %>/images',
                    src: [
                        'generated/*'
                    ]
                }]
            }
        },
        concurrent: {
            server: [
                'jade:dev',
                'coffee:dist',
                'compass:server'
            ],
            test: [
                'coffee',
                'compass'
            ],
            dist: [
                'jade:dev',
                'coffee',
                'compass:dist',
                'imagemin',
                'svgmin',
                'htmlmin'
            ]
        }
    });

    grunt.registerTask('server', function (target) {
        if (target === 'dist') {
            return grunt.task.run(['build', 'open', 'connect:dist:keepalive']);
        }

        grunt.task.run([
            'clean:server',
            'concurrent:server',
            'connect:livereload',
            'open',
            'watch'
        ]);
    });

    grunt.registerTask('test', [
        'clean:server',
        'concurrent:test',
        'connect:test',
        'mocha'
    ]);

    grunt.registerTask('build', [
        'clean:dist',
        'useminPrepare',
        'concurrent:dist',
        'cssmin',
        'concat',
        'uglify',
        'copy',
        'rev',
        'usemin'
    ]);

    grunt.registerTask('default', [
        'jshint',
        'test',
        'build'
    ]);
};
```

ずぼらしてます。
watch以下にjade、jade:devタスク、concurrent:serverとdistにjade:devタスクを足しました。

html5 boilerplateの部分もこの際分離してしまいます。
アンダースコアではじまる`_***.jade`ファイルはテンプレートと見なして見ないようにしています。

```jade:index.jade
extend _h5bp
block title
	//- ...
block body
	//- ...
```


```jade:_h5bp.jade
!!! 5
//if lt IE 7
  <html class="no-js lt-ie9 lt-ie8 lt-ie7">
//if IE 7
  <html class="no-js lt-ie9 lt-ie8">
//if IE 8
  <html class="no-js lt-ie9">
//[if gt IE 8]><!
html(class='no-js')
  //<![endif]
  head
    meta(charset='utf-8')
    meta(http-equiv='X-UA-Compatible', content='IE=edge,chrome=1')
    title
      block title
    meta(name='description', content='')
    meta(name='viewport', content='width=device-width')
    // Place favicon.ico and apple-touch-icon.png in the root directory 
    link(rel='stylesheet', href='styles/main.css')
    // build:js scripts/vendor/modernizr.js 
    script(src='bower_components/modernizr/modernizr.js')
    // endbuild 
  body
    block body
    //- .container
    //-   .hero-unit
    //-     h1 'Allo, 'Allo!
    //-     p You now have
    //-     ul
    //-       li HTML5 Boilerplate
    //-       li Twitter Bootstrap
    //-     p installed.
    //-     h3 Enjoy coding! - Yeoman
    //if lt IE 7
        p.chromeframe
          | You are using an
          strong outdated
          | browser. Please
          a(href='http://browsehappy.com/') upgrade your browser
          | or
          a(href='http://www.google.com/chromeframe/?redirect=true') activate Google Chrome Frame
          | to improve your experience.

    // Google Analytics: change UA-XXXXX-X to be your site's ID. 
    script
      var _gaq=[['_setAccount','UA-XXXXX-X'],['_trackPageview']];
      (function(d,t){var g=d.createElement(t),s=d.getElementsByTagName(t)[0];
      g.src='//www.google-analytics.com/ga.js';
      s.parentNode.insertBefore(g,s)}(document,'script'));
    // build:js scripts/main.js 
    script(src='bower_components/jquery/jquery.js')
    script(src='scripts/main.js')
    // endbuild 
    // build:js(.tmp) scripts/coffee.js 
    script(src='scripts/hello.js')
    // endbuild 
```