New formula: lemon

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/lemon.rb

@@ -0,0 +1,20 @@
+require 'formula'
+
+class Lemon <Formula
+  url 'http://tx97.net/pub/distfiles/lemon-1.69.tar.bz2'
+  homepage 'http://www.hwaci.com/sw/lemon/'
+  md5 '35aebc84c4f0e186aba1303bbef11a37'
+
+  def install
+    lemon_share = share+'lemon'
+
+    lemon_share.install 'lempar.c'
+
+    # patch the parser generator to look for the 'lempar.c' template file where we've installed it
+    lempar_path = lemon_share+'lempar.c'
+    inreplace 'lemon.c', / = pathsearch\([^)]*\);/, " = \"#{lempar_path}\";"
+
+    system ENV.cc, '-o', 'lemon', 'lemon.c'
+    bin.install 'lemon'
+  end
+end