Rakefile: add more targets for development

Author: kruton

Rakefile

@@ -1,6 +1,31 @@
 require 'html/proofer'
 
-task :test do
-  sh "bundle exec jekyll build"
+task :default => :build
+
+desc 'Clean up site output'
+task :clean do
+  cleanup
+end
+
+desc 'Build site with Jekyll'
+task :build => :clean do
+  jekyll('build')
+end
+
+desc 'Check site with html-proofer'
+task :test => :build do
   HTML::Proofer.new("./_site").run
 end
+
+desc 'Start Jekyll server with --watch'
+task :server => :clean do
+  jekyll('serve --watch')
+end
+
+def cleanup
+  sh 'rm -rf _site'
+end
+
+def jekyll(opts = '')
+  sh 'bundle exec jekyll ' + opts
+end