From bfaf6fda4200d51111dbf37b7f9c93cf75f95607 Mon Sep 17 00:00:00 2001
From: Joshua Peek <josh@joshpeek.com>
Date: Sat, 21 May 2011 20:17:13 -0500
Subject: [PATCH] Warn about duplicate lexers

---
 lib/linguist/lexer.rb | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/linguist/lexer.rb b/lib/linguist/lexer.rb
index a41e4d2c..e075e0ce 100644
--- a/lib/linguist/lexer.rb
+++ b/lib/linguist/lexer.rb
@@ -43,8 +43,17 @@ module Linguist
     end
 
     YAML.load_file(File.expand_path("../lexers.yml", __FILE__)).each do |lexer|
+      if @name_index.key?(lexer.name.downcase)
+        warn "Duplicate lexer name: #{lexer.name}"
+      end
+
       @name_index[lexer.name.downcase] = lexer
+
       lexer.aliases.each do |name|
+        if @alias_index.key?(name)
+          warn "Duplicate alias: #{name}"
+        end
+
         @alias_index[name] = lexer
       end
     end