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src/site/_plugins/asset_bundler.rb

Index: src/site/_plugins/asset_bundler.rb
diff --git a/src/site/_plugins/asset_bundler.rb b/src/site/_plugins/asset_bundler.rb
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+++ b/src/site/_plugins/asset_bundler.rb
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+#
+# Jekyll Asset Bundler
+#
+# Author : Colin Kennedy
+# Repo   : http://github.com/moshen/jekyll-asset_bundler
+# License: MIT, see LICENSE file
+#
+
+require 'yaml'
+require 'digest/md5'
+require 'net/http'
+require 'uri'
+
+module Jekyll
+
+  class BundleTag < Liquid::Block
+    @@supported_types = ['js', 'css']
+
+    def initialize(tag_name, text, tokens)
+      super
+      @text = text 
+      @files = {}
+    end
+
+    def render(context)
+      src = context.registers[:site].source
+      raw_markup = super(context)
+      begin
+        @assets = YAML::load(raw_markup)
+      rescue
+        puts <<-END
+Asset Bundler - Error: Problem parsing a YAML bundle
+#{raw_markup}
+
+#{$!}
+END
+      end
+
+      if @assets.class != Array
+        puts "Asset Bundler - Error: YAML bundle is not an Array\n#{raw_markup}"
+        @assets = []
+      end
+
+      add_files_from_list(src, @assets)
+
+      markup = ""
+
+      @files.each {|k,v|
+        markup.concat(Bundle.new(v, k, context).markup())
+      }
+
+      markup
+    end
+
+    def add_files_from_list(src, list)
+      list.each {|a|
+        path = File.join(src, a)
+        if (File.basename(a) !~ /^\.+/ and File.file?(path)) or a =~ /^(https?:)?\/\//i
+          add_file_by_type(a)
+        else
+          puts "Asset Bundler Error - File: #{path} not found, ignoring..."
+        end
+      }
+    end
+
+    def add_file_by_type(file)
+      if file =~ /\.([^\.]+)$/
+        type = $1.downcase()
+        return if @@supported_types.index(type).nil?
+        if !@files.key?(type)
+          @files[type] = []
+        end
+
+        @files[type].push(file)
+      end
+    end
+
+  end
+
+  class BundleGlobTag < BundleTag
+    def add_files_from_list(src, list)
+      list.each {|a|
+        Dir.glob(File.join(src, a)) {|f|
+          if f !~ /^\.+/ and File.file?(f)
+            add_file_by_type(f.sub(src,''))
+          end
+        }
+      }
+    end
+
+  end
+
+  class DevAssetsTag < BundleTag
+    def render(context)
+      if Bundle.config(context)['dev']
+        super(context)
+      else
+        ''
+      end
+    end
+
+    def add_files_from_list(src, list)
+      list.each {|a|
+        add_file_by_type(a)
+      }
+    end
+  end
+
+  class Bundle
+    @@bundles = {}
+    @@default_config = {
+      'compile'        => { 'coffee' => false, 'less' => false },
+      'compress'       => { 'js'     => false, 'css'  => false },
+      'base_path'      => '/bundles/',
+      'remove_bundled' => false,
+      'dev'            => false
+    }
+    attr_reader :content, :hash, :filename, :base
+
+    def initialize(files, type, context)
+      @files    = files
+      @type     = type
+      @context  = context
+      @content  = ''
+      @hash     = ''
+      @filename = ''
+
+      @config = Bundle.config(@context)
+      @base = @config['base_path']
+
+      @filename_hash = Digest::MD5.hexdigest(@files.join())
+      if @@bundles.key?(@filename_hash)
+        @filename = @@bundles[@filename_hash].filename
+        @base     = @@bundles[@filename_hash].base
+      else
+        load_content()
+      end
+    end
+
+    def self.config(context)
+      ret_config = nil
+      if context.registers[:site].config.key?("asset_bundler")
+        ret_config = @@default_config.deep_merge(context.registers[:site].config["asset_bundler"])
+      else
+        ret_config = @@default_config
+      end
+
+      if context.registers[:site].config.key?("dev")
+        ret_config['dev'] = context.registers[:site].config["dev"] ? true : false
+      end
+
+      if context.registers[:site].config['server']
+        ret_config['dev'] = true
+      end
+
+      ret_config
+    end
+
+    def load_content()
+      if @config['dev']
+        @@bundles[@filename_hash] = self
+        return
+      end
+
+      src = @context.registers[:site].source
+
+      @files.each {|f|
+        if f =~ /^(https?:)?\/\//i
+          # Make all requests via http
+          f = "http:#{f}" if !$1
+          f.sub!( /^https/i, "http" ) if $1 =~ /^https/i
+          @content.concat(remote_asset_cache(URI(f)))
+        else
+          @content.concat(File.read(File.join(src, f)))
+        end
+      }
+
+      @hash = Digest::MD5.hexdigest(@content)
+      @filename = "#{@hash}.#{@type}"
+      cache_file = File.join(cache_dir(), @filename)
+
+      if File.readable?(cache_file) and @config['compress'][@type]
+        @content = File.read(cache_file)
+      elsif @config['compress'][@type]
+        # TODO: Compilation of Less and CoffeeScript would go here
+        compress()
+        File.open(cache_file, "w") {|f|
+          f.write(@content)
+        }
+      end
+
+      @context.registers[:site].static_files.push(self)
+      remove_bundled() if @config['remove_bundled']
+
+      @@bundles[@filename_hash] = self
+    end
+
+    def cache_dir()
+      cache_dir = File.expand_path( "../_asset_bundler_cache",
+                                    @context.registers[:site].plugins )
+      if( !File.directory?(cache_dir) )
+        FileUtils.mkdir_p(cache_dir)
+      end
+
+      cache_dir
+    end
+
+    def remote_asset_cache(uri)
+      cache_file = File.join(cache_dir(),
+                             "remote.#{Digest::MD5.hexdigest(uri.to_s)}.#{@type}")
+      content = ""
+
+      if File.readable?(cache_file)
+        content = File.read(cache_file)
+      else
+        begin
+          puts "Asset Bundler - Downloading: #{uri.to_s}"
+          content = Net::HTTP.get(uri)
+          File.open(cache_file, "w") {|f|
+            f.write( content )
+          }
+        rescue
+          puts "Asset Bundler - Error: There was a problem downloading #{f}\n  #{$!}"
+        end
+      end
+
+      return content
+    end
+
+    # Removes StaticFiles from the _site if they are bundled
+    #   and the remove_bundled option is true
+    #   which... it isn't by default
+    def remove_bundled()
+      src = @context.registers[:site].source
+      @files.each {|f|
+        @context.registers[:site].static_files.select! {|s|
+          if s.class == StaticFile
+            s.path != File.join(src, f)
+          else
+            true
+          end
+        }
+      }
+    end
+
+    def compress()
+      return if @config['dev']
+
+      case @config['compress'][@type]
+        when 'yui'
+          compress_yui()
+        when 'closure'
+          compress_closure()
+        else
+          compress_command()
+      end
+    end
+
+    def compress_command()
+      temp_path = cache_dir()
+      command = String.new(@config['compress'][@type])
+      infile = false
+      outfile = false
+      used_files = []
+
+      if command =~ /:infile/
+        File.open(File.join(temp_path, "infile.#{@filename_hash}.#{@type}"), mode="w") {|f|
+          f.write(@content)
+          used_files.push( f.path )
+          infile = f.path
+        }
+        command.sub!( /:infile/, "\"#{infile.gsub(File::SEPARATOR,
+                               File::ALT_SEPARATOR || File::SEPARATOR)}\"")
+      end
+      if command =~ /:outfile/
+        outfile = File.join(temp_path, "outfile.#{@filename_hash}.#{@type}")
+        used_files.push( outfile )
+        command.sub!( /:outfile/, "\"#{outfile.gsub(File::SEPARATOR,
+                               File::ALT_SEPARATOR || File::SEPARATOR)}\"")
+      end
+
+      if infile and outfile
+        `#{command}`
+      else
+        mode = "r"
+        mode = "r+" if !infile
+        IO.popen(command, mode) {|i|
+          if !infile
+            i.puts(@content)
+            i.close_write()
+          end
+          @content = i.gets() if !outfile
+        }
+      end
+
+      if outfile
+        @content = File.read( outfile )
+      end
+
+      used_files.each {|f|
+        File.unlink( f )
+      }
+    end
+
+    def compress_yui()
+      require 'yui/compressor'
+      case @type
+        when 'js'
+          @content = YUI::JavaScriptCompressor.new.compress(@content)
+        when 'css'
+          @content = YUI::CssCompressor.new.compress(@content)
+      end
+    end
+
+    def compress_closure()
+      require 'closure-compiler'
+      case @type
+        when 'js'
+          @content = Closure::Compiler.new.compile(@content)
+      end
+    end
+
+    def markup()
+      return dev_markup() if @config['dev']
+      case @type
+        when 'js'
+          "<script type='text/javascript' src='#{@base}#{@filename}'></script>\n"
+        when 'coffee'
+          "<script type='text/coffeescript' src='#{@base}#{@filename}'></script>\n"
+        when 'css'
+          "<link rel='stylesheet' type='text/css' href='#{@base}#{@filename}' />\n"
+        when 'less'
+          "<link rel='stylesheet/less' type='text/css' href='#{@base}#{@filename}' />\n"
+      end
+    end
+
+    def dev_markup()
+      output = ''
+      @files.each {|f|
+        case @type
+          when 'js'
+            output.concat("<script type='text/javascript' src='#{f}'></script>\n")
+          when 'coffee'
+            output.concat("<script type='text/coffeescript' src='#{f}'></script>\n")
+          when 'css'
+            output.concat("<link rel='stylesheet' type='text/css' href='#{f}' />\n")
+          when 'less'
+            output.concat("<link rel='stylesheet/less' type='text/css' href='#{f}' />\n")
+        end
+      }
+
+      return output
+    end
+
+    # Methods required by Jekyll::Site to write out the bundle
+    #   This is where we give Jekyll::Bundle a Jekyll::StaticFile
+    #   duck call and send it on its way.
+    def destination(dest)
+      File.join(dest, @base, @filename)
+    end
+
+    def write(dest)
+      dest_path = destination(dest)
+      return false if File.exists?(dest_path)
+
+      FileUtils.mkdir_p(File.dirname(dest_path))
+      File.open(dest_path, "w") {|o|
+        o.write(@content)
+      }
+
+      true
+    end
+    # End o' the duck call
+
+  end
+
+end
+
+Liquid::Template.register_tag('bundle'     , Jekyll::BundleTag    )
+Liquid::Template.register_tag('bundle_glob', Jekyll::BundleGlobTag)
+Liquid::Template.register_tag('dev_assets' , Jekyll::DevAssetsTag )