Write the software version, including the git hash, in config.h using cmake

CMakeLists.txt

@@ -2,8 +2,9 @@ cmake_minimum_required(VERSION 2.6)
 
 project(biboumi)
 
-set(${PROJECT_NAME}_VERSION_MAJOR 0)
-set(${PROJECT_NAME}_VERSION_MINOR 1)
+set(${PROJECT_NAME}_VERSION_MAJOR 1)
+set(${PROJECT_NAME}_VERSION_MINOR 0)
+set(${PROJECT_NAME}_VERSION_SUFFIX "~dev")
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++1y -pedantic -Wall -Wextra")
 
@@ -23,6 +24,26 @@ find_package(Libidn)
 find_package(SystemdDaemon)
 find_package(Botan)
 
+#
+## Get the software version
+#
+if(${PROJECT_NAME}_VERSION_SUFFIX MATCHES "~dev")
+  # If we are on a dev version, append the hash of the current git HEAD to
+  # the version
+  include(FindGit)
+  if(GIT_FOUND)
+    execute_process(COMMAND git --git-dir=${CMAKE_SOURCE_DIR}/.git rev-parse --short HEAD
+      OUTPUT_VARIABLE GIT_REVISION
+      OUTPUT_STRIP_TRAILING_WHITESPACE)
+    if(GIT_REVISION)
+      set(${PROJECT_NAME}_VERSION_SUFFIX "${${PROJECT_NAME}_VERSION_SUFFIX} (${GIT_REVISION})")
+    endif()
+  endif()
+endif()
+
+set(BIBOUMI_VERSION
+  ${${PROJECT_NAME}_VERSION_MAJOR}.${${PROJECT_NAME}_VERSION_MINOR}${${PROJECT_NAME}_VERSION_SUFFIX})
+
 # To be able to include the config.h file generated by cmake
 include_directories("${CMAKE_CURRENT_BINARY_DIR}/src/")
 include_directories("${CMAKE_CURRENT_SOURCE_DIR}/src/")