Add signature detection in addition to markdown inclusion.

_plugins/markdown_and_sign.rb

@@ -1,14 +1,26 @@
 # Adds metadata to the post object for linking to the source page.
+# Also adds metadata linking to the gpg signature file, if it exists.
 Jekyll::Hooks.register :posts, :pre_render do |post, payload|
   if post.path =~ /\.md$/
     post.data['md_file'] = "/#{post.data['category']}/#{post.basename}"
+
+    sig_filename = "#{post.path}.asc"
+    if File.exist?(sig_filename)
+      post.data['sig_file'] = post.data['md_file'] + '.asc'
+    end
   end
 end
 
-# Copy all of the source markdown files directly into the destination.
+# Copy all of the source markdown files and signature files
+# directly into the destination.
 Jekyll::Hooks.register :site, :post_write do |site|
   dest = site.dest
   site.posts.docs.select{|p| p.path =~ /\.md$/}.each do |post|
-    FileUtils.cp(post.path, "#{dest}/#{post.data['category']}/#{post.basename}")
+    FileUtils.cp(post.path, "#{dest}/#{post.data['md_file']}")
+
+    sig_filename = "#{post.path}.asc"
+    if File.exist?(sig_filename)
+      FileUtils.cp(sig_filename, "#{dest}/#{post.data['sig_file']}")
+    end
   end
 end