feat(version): add build field to vim.version()

This exposes the git hash of the build to the lua table, generated by CMake.

Closes #23863

cmake/GenerateVersion.cmake

@@ -8,6 +8,14 @@ execute_process(
   ERROR_QUIET
   RESULT_VARIABLE RES)
 
+# Extract build info: "145+g0f9113907" => "g0f9113907"
+#   if on a "dirty" branch, this will also append `-dirty` to the end: "g0f9113907-dirty"
+string(REGEX REPLACE "[0-9]+\\+" "" NVIM_VERSION_BUILD "${GIT_TAG}")
+# Prefix with a `g`
+set(NVIM_VERSION_BUILD "g${NVIM_VERSION_BUILD}")
+file(WRITE "${OUTPUT}" "#define NVIM_VERSION_BUILD \"${NVIM_VERSION_BUILD}\"\n")
+
+
 if(RES)
   message(STATUS "Using NVIM_VERSION: ${NVIM_VERSION}")
   file(WRITE "${OUTPUT}" "")
@@ -33,7 +41,7 @@ endif()
 
 if(NOT "${NVIM_VERSION_HASH}" STREQUAL "${CURRENT_VERSION_HASH}")
   message(STATUS "Using NVIM_VERSION: ${NVIM_VERSION}")
-  file(WRITE "${OUTPUT}" "${NVIM_VERSION_STRING}")
+  file(APPEND "${OUTPUT}" "${NVIM_VERSION_STRING}")
   if(WIN32)
     configure_file("${OUTPUT}" "${OUTPUT}" NEWLINE_STYLE UNIX)
   endif()

src/nvim/version.c

@@ -2560,6 +2560,7 @@ Dictionary version_dict(void)
   PUT(d, "major", INTEGER_OBJ(NVIM_VERSION_MAJOR));
   PUT(d, "minor", INTEGER_OBJ(NVIM_VERSION_MINOR));
   PUT(d, "patch", INTEGER_OBJ(NVIM_VERSION_PATCH));
+  PUT(d, "build", CSTR_AS_OBJ(NVIM_VERSION_BUILD));
   PUT(d, "prerelease", BOOLEAN_OBJ(NVIM_VERSION_PRERELEASE[0] != '\0'));
   PUT(d, "api_level", INTEGER_OBJ(NVIM_API_LEVEL));
   PUT(d, "api_compatible", INTEGER_OBJ(NVIM_API_LEVEL_COMPAT));