Gruntfile.js

module.exports = function (grunt) {

    var env = grunt.option('env') || 'dev';

    grunt.initConfig({

        clean: {
            jekyll: ['_site']
        },
        less: {
            compile: {
                options: {
                    paths: ['assets/stylesheets/less'],
                    yuicompress: true
                },
                files: {
                    'assets/stylesheets/css/main.css': 'assets/stylesheets/less/main.less'
                }
            }
        },
        copy: {
            jquery: {
                files: [
                    {expand: true, cwd: 'bower_components/jquery/', src: ['jquery.min.js'], dest: 'assets/javascript/'}
                ]
            },
            bootstrap: {
                files: [
                    {expand: true, cwd: 'bower_components/bootstrap/dist/js/', src: ['bootstrap.min.js'], dest: 'assets/javascript/'},
                    {expand: true, cwd: 'bower_components/bootstrap/dist/fonts/', src: ['*'], dest: 'assets/stylesheets/fonts/'}
                ]
            }
        },
        watch: {
            styles: {
                files: ['assets/stylesheets/less/*'],
                tasks: ['create-site']
            },
            html: {
                files: ['partials/*.html', '_layouts/*.html', '_includes/**/*.html', '*.html'],
                tasks: ['create-site'],
                options: {
                    interrupt: true
                }
            },
            md: {
                files: ['partials/*.md', '_includes/**/*.md', 'docs/**/*.md', 'news/*.md', '_posts/*.md'],
                tasks: ['create-site'],
                options: {
                    interrupt: true
                }
            },
            javascript: {
                files: ['assets/javascript/main.js'],
                tasks: ['create-site'],
                options: {
                    interrupt: true
                }
            }
        },
        jekyll: {
            options: {
                bundleExec: true,
                src: '<%= app %>'
            },
            deploy: {
                options: {
                    dest: '_site',
                    config: '_config.yml'
                }
            },
            dev: {
                options: {
                    dest: '_site',
                    config: '_config.yml',
                    raw: 'exclude: [package.json, bower.json, node_modules, bower_components, Gemfile, Gemfile.lock, less, Gruntfile.js, reference, apidocs, schema]\n'
                }
            }
        },
        connect: {
            server: {
                options: {
                    port: 4000,
                    base: '_site'
                }
            }
        }

    });

    grunt.loadNpmTasks('grunt-contrib-less');
    grunt.loadNpmTasks('grunt-contrib-watch');
    grunt.loadNpmTasks('grunt-jekyll');
    grunt.loadNpmTasks('grunt-contrib-clean');
    grunt.loadNpmTasks('grunt-contrib-connect');
    grunt.loadNpmTasks('grunt-contrib-copy');

    grunt.registerTask('create-site', ['less:compile', 'copy', 'jekyll:'+env]);
    grunt.registerTask('build-and-watch', ['connect', 'create-site', 'watch']);
    grunt.registerTask('default', ['build-and-watch']);

};