start of gollum tag markup processing

lib/gollum/markup.rb

@@ -1,3 +1,5 @@
+require 'digest/sha1'
+
 module Gollum
   class Markup
     # Initialize a new Markup object.
@@ -17,14 +19,83 @@ module Gollum
     #
     # Returns the formatted String content.
     def render
-      base_markup = GitHub::Markup.render(@name, @data) rescue nil
+      data = extract_tags(@data)
+      data = GitHub::Markup.render(@name, data) rescue ''
+      data = process_tags(data)
     end
 
     # Extract all tags into the tagmap and replace with placeholders.
     #
-    # Returns nothing.
-    def extract_tags
+    # data - The raw String data.
+    #
+    # Returns the placeholder'd String data.
+    def extract_tags(data)
+      data.gsub(/\[\[(.+?)\]\]/) do
+        id = Digest::SHA1.hexdigest($1)
+        @tagmap[id] = $1
+        id
+      end
+    end
 
+    # Process all tags from the tagmap and replace the placeholders with the
+    # final markup.
+    #
+    # data - The String data (with placeholders).
+    #
+    # Returns the marked up String data.
+    def process_tags(data)
+      @tagmap.each do |id, tag|
+        data.sub!(id, process_tag(tag))
+      end
+      data
+    end
+
+    # Process a single tag into its final HTML form.
+    #
+    # tag - The String tag contents (the stuff inside the double brackets).
+    #
+    # Returns the String HTML version of the tag.
+    def process_tag(tag)
+      if html = process_image_tag(tag)
+        return html
+      elsif html = process_file_link_tag(tag)
+        return html
+      else
+        return process_page_link_tag(tag)
+      end
+    end
+
+    # Attempt to process the tag as an image tag.
+    #
+    # tag - The String tag contents (the stuff inside the double brackets).
+    #
+    # Returns the String HTML if the tag is a valid image tag or nil
+    #   if it is not.
+    def process_image_tag(tag)
+      nil
+    end
+
+    # Attempt to process the tag as a file link tag.
+    #
+    # tag - The String tag contents (the stuff inside the double brackets).
+    #
+    # Returns the String HTML if the tag is a valid file link tag or nil
+    #   if it is not.
+    def process_file_link_tag(tag)
+      nil
+    end
+
+    # Attempt to process the tag as a page link tag.
+    #
+    # tag - The String tag contents (the stuff inside the double brackets).
+    #
+    # Returns the String HTML if the tag is a valid page link tag or nil
+    #   if it is not.
+    def process_page_link_tag(tag)
+      parts = tag.split('|')
+      name = parts[0]
+      cname = Gollum::canonical_name(parts[1] || parts[0])
+      %{<a href="#{cname}">#{name}</a>}
     end
   end
 end

test/test_markup.rb

@@ -0,0 +1,9 @@
+require File.join(File.dirname(__FILE__), *%w[helper])
+
+context "Markup" do
+  test "page link" do
+    data = "a [[Bilbo Baggins]] b"
+    output = Gollum::Markup.new("x.md", data).render
+    assert_equal %{<p>a <a href="Bilbo-Baggins">Bilbo Baggins</a> b</p>\n}, output
+  end
+end