Add license scanner.

Makefile

@@ -76,4 +76,7 @@ clean: FL_clean Timeline_clean
 dist:
 	git archive --prefix=non-daw-$(VERSION)/ v$(VERSION) | bzip2 > non-daw-$(VERSION).tar.bz2
 
+scan-gpl:
+	@ scripts/scan-gpl $(SRCS) || echo $(BOLD)$(RED)Some source files do not contain proper license information!
+
 -include .deps

scripts/scan-gpl

@@ -0,0 +1,63 @@
+#!/bin/sh
+
+# Copyright (C) 2008 Jonathan Moore Liles                                     #
+#                                                                             #
+# This program is free software; you can redistribute it and/or modify it     #
+# under the terms of the GNU General Public License as published by the       #
+# Free Software Foundation; either version 2 of the License, or (at your      #
+# option) any later version.                                                  #
+#                                                                             #
+# This program is distributed in the hope that it will be useful, but WITHOUT #
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or       #
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for   #
+# more details.                                                               #
+#                                                                             #
+# You should have received a copy of the GNU General Public License along     #
+# with This program; see the file COPYING.  If not,write to the Free Software #
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  #
+
+#####
+## Simple script to scan source files for GPL headers.
+##
+
+R=0
+
+for i in "$@"
+do
+    HEAD="`head $i`"
+
+    S=
+
+    if echo "$HEAD" | grep -q Copyright
+    then
+        if echo "$HEAD" | grep -q 'GNU General Public License'
+        then
+            S="GPL"
+
+            if echo "$HEAD" | grep -q 'version 2'
+            then
+                S="${S}v2"
+            elif echo "$HEAD" | grep -q 'version 3'
+            then
+                S="${S}v3"
+            fi
+
+            if echo "$HEAD" | grep -q 'any later version'
+            then
+                S="${S} (or later)"
+            fi
+        else
+            S="Not GPL!"
+            R=255
+        fi
+
+    else
+        S="No Copyright!"
+        R=255
+    fi
+
+    printf "%-60s %s\n" "${i}:" "$S"
+done
+
+
+exit $R