add version

CMakeLists.txt

@@ -3,10 +3,30 @@ cmake_minimum_required(VERSION 2.8)
 # add modules
 set (CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/Modules")
 
+# set version
+set(VERSION_MAJOR "0")
+set(VERSION_MINOR "3")
+set(VERSION_PATCH "2")
+set(VERSION "${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH}")
+
+# append git revision if available
+include(get-git-revision)
+get_git_revision(VERSION_GIT)
+if(NOT "${VERSION_GIT}" STREQUAL "")
+    set(VERSION "${VERSION}-${VERSION_GIT}")
+endif()
+
+message(STATUS "Configuring steins-gate version " ${VERSION})
+
+# project name and language
 project (steins-gate CXX)
 set(CMAKE_BUILD_TYPE Debug)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -O2")
 
+# include version number in header
+configure_file(${PROJECT_SOURCE_DIR}/src/version.hpp.in
+    ${PROJECT_SOURCE_DIR}/src/version.hpp)
+
 find_package(Boost REQUIRED COMPONENTS system)
 find_package(SFML 2 REQUIRED COMPONENTS system window graphics)
 find_package(GStreamer REQUIRED)

cmake/Modules/get-git-revision.cmake

@@ -0,0 +1,37 @@
+
+# this function returns the git hash of the current checkout, if the 'git'
+# command is available, it is a git checkout and it is not a tagged release.
+function(get_git_revision _hashvar)
+    # got git?
+    if(NOT GIT_FOUND)
+        find_package(Git QUIET)
+    endif()
+    if(GIT_FOUND)
+        # TODO: look for source directory (for out-of-source builds)?
+
+        # check, if we have a tagged release
+        execute_process(COMMAND ${GIT_EXECUTABLE} describe --tags --exact-match
+            WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+            RESULT_VARIABLE EXIT_CODE
+            OUTPUT_QUIET
+            ERROR_QUIET
+        )
+        # it failed => not a tagged revision
+        if(NOT ${EXIT_CODE} EQUAL 0)
+            execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse --short=10 HEAD
+                WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+                RESULT_VARIABLE EXIT_CODE
+                OUTPUT_VARIABLE GIT_REV
+                ERROR_QUIET
+                OUTPUT_STRIP_TRAILING_WHITESPACE
+            )
+            if(${EXIT_CODE} EQUAL 0)
+                # all good, set hash
+                set(${_hashvar} "${GIT_REV}" PARENT_SCOPE)
+                return()
+            endif()
+        endif()
+    endif()
+    # no git available or any other error above, set to empty string
+    set(${_hashvar} "" PARENT_SCOPE)
+endfunction()

src/version.hpp.in

@@ -0,0 +1,10 @@
+#ifndef VERSION_HPP
+#define VERSION_HPP
+
+#define VERSION       "@VERSION@"
+#define VERSION_MAJOR "@VERSION_MAJOR@"
+#define VERSION_MINOR "@VERSION_MINOR@"
+#define VERSION_PATCH "@VERSION_PATCH@"
+#define VERSION_GIT   "@VERSION_GIT@"
+
+#endif