Add Git-derived version reporting

CMakeLists.txt

@@ -1,11 +1,34 @@
 cmake_minimum_required(VERSION 3.16)
 
-project(kindle2notes LANGUAGES CXX)
+project(kindle2notes VERSION 1.0 LANGUAGES CXX)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
+set(KINDLE2NOTES_VERSION "${PROJECT_VERSION}")
+find_package(Git QUIET)
+if(Git_FOUND)
+  execute_process(
+    COMMAND ${GIT_EXECUTABLE} describe --tags --long --dirty --always
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+    RESULT_VARIABLE KINDLE2NOTES_GIT_RESULT
+    OUTPUT_VARIABLE KINDLE2NOTES_GIT_DESCRIBE
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    ERROR_QUIET
+  )
+
+  if(KINDLE2NOTES_GIT_RESULT EQUAL 0 AND NOT KINDLE2NOTES_GIT_DESCRIBE STREQUAL "")
+    if(KINDLE2NOTES_GIT_DESCRIBE MATCHES "^(.+)-0-g[0-9a-f]+$")
+      set(KINDLE2NOTES_VERSION "${CMAKE_MATCH_1}")
+    else()
+      set(KINDLE2NOTES_VERSION "${KINDLE2NOTES_GIT_DESCRIBE}")
+    endif()
+  endif()
+endif()
+
+message(STATUS "kindle2notes version: ${KINDLE2NOTES_VERSION}")
+
 function(kindle2notes_enable_warnings target)
   if(MSVC)
     target_compile_options(${target} PRIVATE /W4)
@@ -29,3 +52,6 @@ add_executable(kindle2notes
   typefactory/typefactory.h
 )
 kindle2notes_enable_warnings(kindle2notes)
+target_compile_definitions(kindle2notes PRIVATE
+  KINDLE2NOTES_VERSION="${KINDLE2NOTES_VERSION}"
+)