From 1d61453b16065e215edcbfe50827fcdbdcf2aec1 Mon Sep 17 00:00:00 2001
From: Richard Otrebski <otrebski@technikum-wien.at>
Date: Thu, 25 Oct 2018 20:10:26 +0200
Subject: [PATCH] Added function to repeatedly run the version builder on every
 compilation run. Therefore running CMake is not required to be run again to
 get the current version information

---
 cmake.cmake | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/cmake.cmake b/cmake.cmake
index 2cdf085..44870b9 100644
--- a/cmake.cmake
+++ b/cmake.cmake
@@ -48,3 +48,25 @@ function(GET_GIT_VERSION OUTPUT_VARIABLE)
   _CREATE_GIT_VERSION_FILE()
   _SET_GITVERSION_CMAKE_VARIABLE(${OUTPUT_VARIABLE})
 endfunction(GET_GIT_VERSION OUTPUT_VARIABLE)
+
+######################################################
+# Add git version information
+# Uses:
+#   GIT_VERSION_INFO(buildtarget)
+# Then, you can write in your source file:
+#   #include <gitversion/version.h>
+#   cout << gitversion::VERSION.toString() << endl;
+######################################################
+function(GIT_VERSION_INFO TARGET_)
+  FILE(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/messmer_gitversion")
+  FILE(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/messmer_gitversion/gitversion")
+
+  IF(NOT TARGET ${PROJECT_NAME}_VERSION_INFO)
+      add_custom_target( ${PROJECT_NAME}_VERSION_INFO
+          COMMAND  /usr/bin/env PYTHONPATH=${DIR_OF_GITVERSION_TOOL}/src:"$PYTHONPATH" python -m gitversionbuilder --lang cpp --dir "${CMAKE_CURRENT_SOURCE_DIR}" "${CMAKE_CURRENT_BINARY_DIR}/messmer_gitversion/gitversion/version.h"
+          BYPRODUCTS "${CMAKE_CURRENT_BINARY_DIR}/messmer_gitversion/gitversion/version.h"
+          )
+  ENDIF()
+  TARGET_INCLUDE_DIRECTORIES(${TARGET_} PRIVATE "${CMAKE_CURRENT_BINARY_DIR}/messmer_gitversion")
+  ADD_DEPENDENCIES(${TARGET_} ${PROJECT_NAME}_VERSION_INFO)
+endfunction(GIT_VERSION_INFO)