CMake: Fix version generation: regenare on every build

CMakeLists.txt

@@ -1,25 +1,6 @@
 cmake_minimum_required(VERSION 3.16)
 project(endgame-analyzer CXX)
 
-execute_process(
-        COMMAND git describe
-        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
-        OUTPUT_VARIABLE GIT_DESCRIPTION
-        OUTPUT_STRIP_TRAILING_WHITESPACE
-)
-
-execute_process(
-        COMMAND git -c log.showsignature=false log -1 --format=%h
-        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
-        OUTPUT_VARIABLE GIT_COMMIT_HASH
-        OUTPUT_STRIP_TRAILING_WHITESPACE
-)
-
-configure_file(
-  ${CMAKE_SOURCE_DIR}/include/version.h.in
-  ${CMAKE_BINARY_DIR}/generated/version.h
-)
-include_directories(${CMAKE_BINARY_DIR}/generated)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wpedantic -Werror")
@@ -41,8 +22,7 @@ set(Boost_USE_STATIC_LIBS ON)
 include_directories(.)
 include_directories(${Boost_INCLUDE_DIR})
 
-add_executable(endgame-analyzer
+set(SOURCES
-        src/main.cpp
     src/state_explorer.cpp
     src/download.cpp
     src/command_line_interface.cpp
@@ -52,15 +32,29 @@ add_executable(endgame-analyzer
     src/make_state.cpp
 )
 
+# Include git module from https://github.com/rpavlik/cmake-modules to
+# dynamically include git revisions into the build.
+# This re-generates the file version.cpp whenever the git HEAD changes.
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake-modules/")
+include(GetGitRevisionDescription)
+get_git_head_revision(GIT_REFSPEC GIT_SHA1)
+git_describe(GIT_DESCRIPTION)
+git_local_changes(GIT_LOCAL_CHANGES)
+configure_file(
+        ${CMAKE_SOURCE_DIR}/src/version.cpp.in
+        ${CMAKE_CURRENT_BINARY_DIR}/generated/version.cpp
+)
+list(APPEND SOURCES ${CMAKE_CURRENT_BINARY_DIR}/generated/version.cpp)
+
+
+add_executable(endgame-analyzer
+        src/main.cpp
+        ${SOURCES}
+)
+
 add_executable(unit-tests
         test/unit_test.cpp
-        src/state_explorer.cpp
+        ${SOURCES}
-        src/download.cpp
-        src/command_line_interface.cpp
-        src/parse_game.cpp
-        src/hanabi_types.cpp
-        src/game_interface.cpp
-        src/make_state.cpp
 )
 
 target_link_libraries(endgame-analyzer cpr)

src/command_line_interface.cpp

@@ -39,7 +39,12 @@ namespace Hanabi
   int run_cli(CLIParms const & parms)
   {
     if (parms.version_info) {
-      std::cout << "endgame-analyzer " << VERSION_GIT_DESCRIPTION << " (commit " << VERSION_GIT_COMMIT_HASH << ")";
+      std::cout << "endgame-analyzer " << Version::git_description << " (commit ";
+      std::cout.write(Version::git_sha1.data(), 8) << ")" << std::endl;
+      if (Version::is_dirty())
+      {
+        std::cout << "Warning: The repository contains local changes that are not part of the build." << std::endl;
+      }
       return EXIT_SUCCESS;
     }
     // We want to do this sanity check here again,