--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cmake/HGVersion.cmake	Fri Apr 25 10:14:33 2014 +0000
@@ -0,0 +1,57 @@
+# Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
+# Software engineering by Intevation GmbH
+#
+# This file is Free Software under the GNU GPL (v>=2)
+# and comes with ABSOLUTELY NO WARRANTY!
+# See LICENSE.txt for details.
+
+# This makes some variables available to generate a nice version number for
+# hg managed repositories.
+# It sets HG_REVISION_TAG to the value of the latest tag
+# HG_REVISION_DIST to the differences between the tag and the current tip
+# HG_REVISION_ID to the actual revision
+# based on code found in the lemon graph library https://lemon.cs.elte.hu
+# HG_REVISON to a nice combination of those.
+find_package(Hg)
+if (HG_FOUND)
+  EXECUTE_PROCESS(
+    COMMAND
+    hg log -r. --template "{latesttag}"
+    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+    OUTPUT_VARIABLE HG_REVISION_TAG
+    ERROR_QUIET
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+  )
+  EXECUTE_PROCESS(
+    COMMAND
+    hg log -r. --template "{latesttagdistance}"
+    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+    OUTPUT_VARIABLE HG_REVISION_DIST
+    ERROR_QUIET
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+  )
+  EXECUTE_PROCESS(
+    COMMAND
+    hg log -r. --template "{node|short}"
+    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+    OUTPUT_VARIABLE HG_REVISION_ID
+    ERROR_QUIET
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+  )
+
+  IF(HG_REVISION_TAG STREQUAL "")
+    SET(HG_REVISION_ID "hg-tip")
+  ELSE()
+    IF(HG_REVISION_TAG STREQUAL "null")
+      SET(HG_REVISION_TAG "trunk")
+    ELSEIF(HG_REVISION_TAG MATCHES "^r")
+      STRING(SUBSTRING ${HG_REVISION_TAG} 1 -1 HG_REVISION_TAG)
+    ENDIF()
+    IF(HG_REVISION_DIST STREQUAL "0")
+      SET(HG_REVISION ${HG_REVISION_TAG})
+    ELSE()
+      SET(HG_REVISION
+        "${HG_REVISION_TAG}+${HG_REVISION_DIST}-${HG_REVISION_ID}")
+    ENDIF()
+  ENDIF()
+ENDIF()