A jekyll plugin for compressing HTML, JavaScript files when rendering.

compressor.rb

# 
# File compressor plugin for jekyll
# =================================
# 
# By [mytharcher](https://github.com/mytharcher)
# 2012-05-20
# 
# Updated by [nicoespeon](https://github.com/nicoespeon)
# 2013-04-12
# 
# This plugin for compressing text files, including
# HTML and JavaScript of jekyll site. NOT support CSS
# file yet.
# 
# The JavaScript compressing requires 'packr', a
# third-party lib. I'm not sure if GitHub has this
# extension. But the compressor for HTML files works OK.
# 
# For HTML files it uses Alan Moore's regexp : 
# http://stackoverflow.com/questions/5312349/minifying-final-html-output-using-regular-expressions-with-codeigniter
# It removes spaces between HTML, excepted within
# <textarea> and <pre> code, so you don't get into trouble!
# 

require 'packr'

module Jekyll

  module Compressor

    def compress_html(content)
      content.gsub(/(?>[^\S ]\s*|\s{2,})(?=(?:(?:[^<]++|<(?!\/?(?:textarea|pre)\b))*+)(?:<(?>textarea|pre)\b|\z))/ix, '')
    end

    # Really writing process
    def output_file(dest, content)
      FileUtils.mkdir_p(File.dirname(dest))
      File.open(dest, 'w') do |f|
        f.write(content)
      end
    end

    def output_html(dest, content)
      path = self.destination(dest)
      self.output_file(path, compress_html(content))
    end

    def output_js(dest, content)
      self.output_file(dest, Packr.pack(content,
        :shrink_vars => true
      ))
    end

  end



  # Overwrite old methods to insert a hook

  class Post

    include Compressor

    def write(dest)
      self.output_html(dest, self.output)
    end

  end



  class Page

    include Compressor

    def write(dest)
      self.output_html(dest, self.output)
    end

  end



  class StaticFile

    include Compressor
  	
    def write(dest)
      dest_path = self.destination(dest)

      return false if File.exist?(dest_path) and !self.modified?
      @@mtimes[path] = mtime

      case File.extname(dest_path)
        when '.html'
          self.output_html(dest_path, File.read(path))
        when '.js'
          self.output_js(dest_path, File.read(path))
        else
          FileUtils.mkdir_p(File.dirname(dest_path))
          FileUtils.cp(path, dest_path)
      end

      true
    end

  end

end

I wrote a Jekyll layout that compresses HTML in pure Liquid. It works on Github Pages.

Works great! Is there a way to exclude a specific section of HTML from being compressed? Part of my page layout relies on text-align: justify which needs a space in between elements.

Thanks man! Works great! :)

Thanks for the nice plugin. However I've made a small improvement because this plugin always fucked up my rss.xml. https://gist.github.com/kimar/cc2cc5fd86d6abe54042#file-compressor-rb-L45-L49

@jelmerdemaat why not use a   ?

great program....Fulfill my purpose 100%...

Good Job! Thanks so much man!!

Fixes an @@mtime error, static files being copied into a subdirectory and some whitespace/URL updates:

--- compressor-old.rb
+++ compressor-new.rb
@@ -1,26 +1,26 @@
-# 
+#
 # File compressor plugin for jekyll
 # =================================
-# 
+#
 # By [mytharcher](https://github.com/mytharcher)
 # 2012-05-20
-# 
+#
 # Updated by [nicoespeon](https://github.com/nicoespeon)
 # 2013-04-12
-# 
+#
 # This plugin for compressing text files, including
 # HTML and JavaScript of jekyll site. NOT support CSS
 # file yet.
-# 
+#
 # The JavaScript compressing requires 'packr', a
 # third-party lib. I'm not sure if GitHub has this
 # extension. But the compressor for HTML files works OK.
-# 
-# For HTML files it uses Alan Moore's regexp : 
-# http://stackoverflow.com/questions/5312349/minifying-final-html-output-using-regular-expressions-with-codeigniter
+#
+# For HTML files it uses Alan Moore's regexp :
+# https://stackoverflow.com/questions/5312349/minifying-final-html-output-using-regular-expressions-with-codeigniter
 # It removes spaces between HTML, excepted within
 # <textarea> and <pre> code, so you don't get into trouble!
-# 
+#
 
 require 'packr'
 
@@ -41,7 +41,7 @@
     end
 
     def output_html(dest, content)
-      path = self.destination(dest)
+      path = dest
       self.output_file(path, compress_html(content))
     end
 
@@ -62,7 +62,7 @@
     include Compressor
 
     def write(dest)
-      self.output_html(dest, self.output)
+      self.output_html(self.destination(dest), self.output)
     end
 
   end
@@ -74,7 +74,7 @@
     include Compressor
 
     def write(dest)
-      self.output_html(dest, self.output)
+      self.output_html(self.destination(dest), self.output)
     end
 
   end
@@ -84,12 +84,12 @@
   class StaticFile
 
     include Compressor
-  	
+
     def write(dest)
       dest_path = self.destination(dest)
 
       return false if File.exist?(dest_path) and !self.modified?
-      @@mtimes[path] = mtime
+      self.class.mtimes[path] = mtime
 
       case File.extname(dest_path)
         when '.html'
@@ -106,4 +106,4 @@
 
   end
 
-end
\ No newline at end of file
+end