Move the script to here and fix the submodule

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "wiki-data"]
 	path = wiki-data
-	url = https://github.com/CTHN/wiki-data
+	url = git@github.com:CTHN/wiki-data.git

scripts/weak-link-checker.rb

@@ -0,0 +1,34 @@
+#!/usr/bin/env ruby
+
+# Simple script to check broken links in the wiki. This is a weak and simple
+# check to work with markdown, html and even php scripts. Keep in mind that
+# the script does not find linked pages through "meta-pages" like a php script
+# which links all files in the /user/ folder.
+#
+# Last change: 2014-06-27, Aaron Mueller <mail@aaron-mueller.de>
+
+
+blacklist = [
+  'mainpage',
+  'error_404'
+]
+
+Dir.chdir(File.join(File.dirname(__FILE__), '..', 'wiki-data'))
+
+files = Dir.glob('pages/**/*')
+    .delete_if {|file| Dir.exists?(file) }
+wiki_links = files
+    .map {|file| file[6..-1].split('.').first }
+    .delete_if {|file| blacklist.include?(file) }
+
+files.each do |file|
+  content = File.new(file).read
+  wiki_links.reject! do |link|
+    not content.scan(/#{link}/).empty?
+  end
+end
+
+wiki_links.each do |broken_link|
+  puts "Check linkage for '#{broken_link}'."
+end
+puts "#{wiki_links.size} in total."