cmake: Improved the NSIS module.

cmake/Modules/FindNSIS.cmake

@@ -1,23 +1,42 @@
 # - Try to find NSIS
 # Once done this will define
 #
+#  NSIS_ROOT_DIR - Set this variable to the root installation of ZLIB
+#
+# Read-Only variables:
 #  NSIS_FOUND - system has NSIS
 #  NSIS_MAKE - NSIS creator executable
 #
-#  Copyright (c) 2010 Andreas Schneider <mail@cynapses.org>
+#=============================================================================
+#  Copyright (c) 2010-2011 Andreas Schneider <asn@cryptomilk.org>
 #
-#  Redistribution and use is allowed according to the terms of the New
-#  BSD license.
-#  For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+#  Distributed under the OSI-approved BSD License (the "License");
+#  see accompanying file Copyright.txt for details.
 #
+#  This software is distributed WITHOUT ANY WARRANTY; without even the
+#  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#  See the License for more information.
+#=============================================================================
+#
+
+set(_NSIS_ROOT_PATHS
+    C:/NSIS/Bin
+    "$ENV{PROGRAMFILES}/NSIS"
+)
+
+find_path(NSIS_ROOT_PATHS
+    NAMES
+        NSIS.exe
+    PATHS
+        ${_NSIS_ROOT_PATHS}
+)
 
 find_program(NSIS_MAKE
     NAMES
         makensis
     PATHS
-        ${_NSIS_DIR}
-        ${_NSIS_DIR}/Bin
-        $ENV{PROGRAMFILES}/NSIS
+        ${NSIS_ROOT_PATH}
+        ${NSIS_ROOT_PATH}/Bin
 )
 
 include(FindPackageHandleStandardArgs)