It seems .rst.txt is an acceptable rst extension

blasted windows users

README.md

@@ -17,11 +17,11 @@ Once your script is in place, edit `lib/github/markups.rb` and tell
 GitHub Markup about it. Again we look to [rest2html][r2hc] for
 guidance:
 
-    command(:rest2html, /rest|rst/)
+    command(:rest2html, /re?st(.txt)?/)
 
 Here we're telling GitHub Markup of the existence of a `rest2html`
-command which should be used for any file ending in `rest` or
-`rst`. Any regular expression will do.
+command which should be used for any file ending in `rest`,
+`rst`, `rest.txt` or `rst.txt`. Any regular expression will do.
 
 Finally add your tests. Create a `README.extension` in `test/markups`
 along with a `README.extension.html`. As you may imagine, the

lib/github/markups.rb

@@ -14,7 +14,7 @@
   Orgmode::Parser.new(content).to_html
 end
 
-command(:rest2html, /rest|rst/)
+command(:rest2html, /re?st(.txt)?/)
 
 command('asciidoc -s --backend=xhtml11 -o - -', /asciidoc/)
 

test/markup_test.rb

@@ -6,7 +6,7 @@
 class MarkupTest < Test::Unit::TestCase
   Dir['test/markups/README.*'].each do |readme|
     next if readme =~ /html$/
-    markup = readme.split('.').last
+    markup = readme.split('/').last.gsub(/^README\./, '')
 
     define_method "test_#{markup}" do
       expected = File.read("#{readme}.html")

test/markups/README.rst.txt

@@ -0,0 +1,13 @@
+Header 1
+========
+
+Example text.
+
+Header 2
+--------
+
+1. Blah blah ``code`` blah
+
+2. More ``code``, hooray
+
+

test/markups/README.rst.txt.html

@@ -0,0 +1,14 @@
+<div class="document">
+<div class="section" id="header-1">
+<h1>Header 1</h1>
+<p>Example text.</p>
+<div class="section" id="header-2">
+<h2>Header 2</h2>
+<ol class="arabic simple">
+<li>Blah blah <tt class="docutils literal">code</tt> blah</li>
+<li>More <tt class="docutils literal">code</tt>, hooray</li>
+</ol>
+</div>
+</div>
+</div>
+