Add initial serve command

The `ServeCommand` will let you serve your site locally for development. You
can specify `--port`, `--host` and `--baseurl` options if you wish to change the
defaults.

Additionally the `BuildCommand` will be called before the processing of the
serve command, this makes sure that the site is actually built. This means you
are able to pass the `--watch` option to auto-regenerate your site, even while
serving it locally.

bin/jekyll2

@@ -29,3 +29,32 @@ command :build do |c|
     Jekyll::BuildCommand.process(options)
   end
 end
+
+# Serve command
+#
+# Args:
+#   --source
+#   --destination
+#   --watch
+#
+#   --port
+#   --host
+#   --baseurl
+command :serve do |c|
+  c.syntax = 'jekyll serve [options]'
+  c.description = 'Serve...'
+  c.option '-w', '--watch', 'Watch for changes and rebuild'
+  c.option '-p', '--port [PORT]', 'Port to listen on'
+  c.option '-h', '--host [HOST]', 'Host to bind to'
+  c.option '-b', '--baseurl [URL]', 'Base URL'
+  c.action do |args, options|
+    options.default :watch => false,
+                    :port => '4000',
+                    :host => '0.0.0.0',
+                    :baseurl => '/',
+                    :serving => true
+
+    Jekyll::BuildCommand.process(options)
+    Jekyll::ServeCommand.process(options)
+  end
+end

lib/jekyll/commands/build.rb

@@ -14,20 +14,21 @@ module Jekyll
       destination = opts['destination']
 
       if opts['watch']
-        self.watch(site, source, destination)
+        self.watch(site, opts)
       else
-        self.build(site, source, destination)
+        self.build(site, opts)
       end
     end
 
     # Private: Build the site from source into destination.
     #
     # site - A Jekyll::Site instance
-    # source - A String of the source path
+    # options - A Hash of options passed to the command
-    # destination - A String of the destination path
     #
     # Returns nothing.
-    def self.build(site, source, destination)
+    def self.build(site, options)
+      source = options['source']
+      destination = options['destination']
       puts "Building site: #{source} -> #{destination}"
       begin
         site.process
@@ -44,13 +45,15 @@ module Jekyll
     # Private: Watch for file changes and rebuild the site.
     #
     # site - A Jekyll::Site instance
-    # source - A String of the source path
+    # options - A Hash of options passed to the command
-    # destination - A String of the destination path
     #
     # Returns nothing.
-    def self.watch(site, source, destination)
+    def self.watch(site, options)
       require 'directory_watcher'
 
+      source = options['source']
+      destination = options['destination']
+
       puts "Auto-Regenerating enabled: #{source} -> #{destination}"
 
       dw = DirectoryWatcher.new(source)
@@ -65,12 +68,14 @@ module Jekyll
 
       dw.start
 
-      trap("SIGINT") do
+      unless options['serving']
-        puts "Stopping auto-regeneration..."
+        loop { sleep 1000 }
-        exit 0
-      end
 
-      loop { sleep 1000 }
+        trap("INT") do
+          puts "Stopping auto-regeneration..."
+          exit 0
+        end
+      end
     end
   end
 

lib/jekyll/commands/serve.rb

@@ -0,0 +1,28 @@
+module Jekyll
+
+  class ServeCommand < Command
+    def self.process(options)
+      require 'webrick'
+      include WEBrick
+
+      destination = options.destination
+
+      FileUtils.mkdir_p(destination)
+
+      mime_types = WEBrick::HTTPUtils::DefaultMimeTypes
+      mime_types.store 'js', 'application/javascript'
+
+      s = HTTPServer.new(
+        :Port => options.port,
+        :BindAddress => options.host,
+        :MimeTypes => mime_types
+      )
+
+      s.mount(options.baseurl, HTTPServlet::FileHandler, destination)
+      t = Thread.new { s.start }
+      trap("INT") { s.shutdown }
+      t.join()
+    end
+  end
+
+end