Burn require 'markdown' with the fire of a thousand suns

vmg · vmg · commit ddaffd382a5b · 2011-12-07T13:26:48.000+01:00
GitHub::Markup now has an actual preference order for Markdown libraries,
tries to require them explicitly and use their actual APIs instead of
the compatibility 'Markdown' layer.

Redcarpet is the default library, and the one listed in the Gemfile.
If it's not available, the (opinionated) require order is:

	- Redcarpet
	- RDiscount
	- Maruku
	- Kramdown
	- BlueCloth

This soothes my soul.
diff --git a/lib/github/markup.rb b/lib/github/markup.rb
@@ -22,8 +22,9 @@ def render(filename, content = nil)
     def markup(file, pattern, &block)
       require file.to_s
       add_markup(pattern, &block)
+      true
     rescue LoadError
-      nil
+      false
     end
 
     def command(command, regexp, &block)
diff --git a/lib/github/markup/rdoc.rb b/lib/github/markup/rdoc.rb
@@ -1,3 +1,4 @@
+require "rdoc"
 require "rdoc/markup/to_html"
 
 module GitHub
diff --git a/lib/github/markups.rb b/lib/github/markups.rb
@@ -1,5 +1,20 @@
-markup(:markdown, /md|mkdn?|mdown|markdown/) do |content|
-  Markdown.new(content).to_html
+MD_FILES = /md|mkdn?|mdown|markdown/
+
+if markup(:redcarpet, MD_FILES) do |content|
+    RedcarpetCompat.new(content).to_html
+  end 
+elsif markup(:rdiscount, MD_FILES) do |content|
+    RDiscount.new(content).to_html
+  end 
+elsif markup(:maruku, MD_FILES) do |content|
+    Maruku.new(content).to_html
+  end 
+elsif markup(:kramdown, MD_FILES) do |content|
+    Kramdown::Document.new(content).to_html
+  end
+elsif markup(:bluecloth, MD_FILES) do |content|
+    BlueCloth.new(content).to_html
+  end
 end
 
 markup(:redcloth, /textile/) do |content|

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,4 @@`
	`1`	`+require "rdoc"`
`1`	`2`	`require "rdoc/markup/to_html"`
`2`	`3`
`3`	`4`	`module GitHub`