grunt watch & connect

Question

I am kinda new to grunt and want to use it with Jekyll and some LESS-compiling.

My problem now is, I already have fully functioning LESS-comipiling with live reload and watch task and can build my jekyll site through grunt, but how do I run something like the jekyll serve or grunt-connect and grunt watch simultaneously? I want a grunt task that provides the watching of my LESS-files etc, builds the jekyll site and then runs a small web server with grunt-connect or whatever.

My Gruntfile.js so far:

'use strict';
module.exports = function (grunt) {

    grunt.initConfig({
        jshint: {
            options: {
                jshintrc: '.jshintrc'
            },
            all: [
                'Gruntfile.js',
                'js/*.js',
                '!js/scripts.min.js'
            ]
        },
        less: {
            dist: {
                files: {
                    'css/styles.min.css': [
                        'less/app.less'
                    ]
                },
                options: {
                    compress: true,
                    // LESS source map
                    // To enable, set sourceMap to true and update sourceMapRootpath based on your install
                    sourceMap: false,
                    sourceMapFilename: 'css/styles.min.css.map',
                    sourceMapRootpath: '/'
                }
            },
            dev: {
                files: {
                    'css/styles.min.css': [
                        'less/app.less'
                    ]
                },
                options: {
                    compress: false,
                    // LESS source map
                    // To enable, set sourceMap to true and update sourceMapRootpath based on your install
                    sourceMap: true,
                    sourceMapFilename: 'css/styles.min.css.map',
                    sourceMapRootpath: '/'
                }
            }
        },
        uglify: {
            dist: {
                files: {
                    'js/scripts.min.js': [
                        'vendor/bootstrap/js/transition.js',
                        'vendor/bootstrap/js/alert.js',
                        'vendor/bootstrap/js/button.js',
                        'vendor/bootstrap/js/carousel.js',
                        'vendor/bootstrap/js/collapse.js',
                        'vendor/bootstrap/js/dropdown.js',
                        'vendor/bootstrap/js/modal.js',
                        'vendor/bootstrap/js/tooltip.js',
                        'vendor/bootstrap/js/popover.js',
                        'vendor/bootstrap/js/scrollspy.js',
                        'vendor/bootstrap/js/tab.js',
                        'vendor/bootstrap/js/affix.js',
                        'vendor/*.js',
                        'js/_*.js'
                    ]
                },
                options: {
                    // JS source map: to enable, uncomment the lines below and update sourceMappingURL based on your install
                    // sourceMap: 'assets/js/scripts.min.js.map',
                    // sourceMappingURL: '/app/themes/roots/assets/js/scripts.min.js.map'
                }
            }
        },
        watch: {
            less: {
                files: [
                    'less/*.less',
                    'less/bootstrap/*.less'
                ],
                tasks: ['less:dev']
            },
            js: {
                files: [
                    '<%= jshint.all %>'
                ],
                tasks: ['jshint', 'uglify']
            },
            livereload: {
                // Browser live reloading
                // https://github.com/gruntjs/grunt-contrib-watch#live-reloading
                options: {
                    livereload: true
                },
                files: [
                    '_site/*'
                ]
            }
        },
        clean: {
            dist: [
                'css/styles.min.css',
                'css/styles.min.css.map',
                'js/scripts.min.js',
                '_site/*'
            ]
        },
        jekyll: {                             // Task
            options: {                          // Universal options
                bundleExec: true,
                src : '<%= app %>'
            },
            dist: {                             // Target
                options: {                        // Target options
                    dest: '<%= dist %>',
                    config: '_config.yml'
                }
            },
            serve: {                            // Another target
                options: {
                    serve: true,
                    drafts: true
                }
            }
        },
        connect: {
            server: {
                options: {
                    keepalive: true
                }
            }
        }
    });

    // Load tasks
    grunt.loadNpmTasks('grunt-contrib-clean');
    grunt.loadNpmTasks('grunt-contrib-jshint');
    grunt.loadNpmTasks('grunt-contrib-uglify');
    grunt.loadNpmTasks('grunt-contrib-watch');
    grunt.loadNpmTasks('grunt-contrib-less');
    grunt.loadNpmTasks('grunt-jekyll');
    grunt.loadNpmTasks('grunt-contrib-connect');

    // Register tasks
    grunt.registerTask('default', [
        'clean',
        'less:dist',
        'uglify',
        'jekyll:dist'
    ]);
    grunt.registerTask('dev', [
        'watch'
    ]);

};

Answer 1

You need to tell connect what directory to serve up in the configuration using the "base" option, in this case it would be the static _site directory. You can also change the port to whatever you want, but you end up navigating to localhost:9009 with my example

connect: {
  server: {
    options: {
      livereload: true,
      base: '_site/',
      port: 9009
    }
  }
}

You will also want to add a watch task for when you change your html templates. Something like this would work.

watch: {
  html: {
    files: ['**/*.html', '!_site/**/*.html'],
    tasks: ['jekyll:dist']
  }
}

Then create a "serve" task like Wallace suggested.

// Start web server
grunt.registerTask('serve', [
'jekyll:dist',
'connect:server',
'watch'
]);

Lastly run "grunt serve" in the command line and navigate to localhost with the port you specified.

---

As commented by @jiggy

The key change is to not set keepalive to true. Keepalive will block all subsequent tasks from running. So long as connect is followed by watch the server won't terminate.