feat: include a version string from git at build time

CMakeLists.txt

@@ -87,6 +87,38 @@ file(GLOB SD_LIB_SOURCES
     "*.hpp"
 )
 
+find_program(GIT_EXE NAMES git git.exe NO_CMAKE_FIND_ROOT_PATH)
+if(GIT_EXE)
+    execute_process(COMMAND ${GIT_EXE} describe --tags --abbrev=7 --dirty=+
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+        OUTPUT_VARIABLE SDCPP_BUILD_VERSION
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        ERROR_QUIET
+    )
+    execute_process(COMMAND ${GIT_EXE} rev-parse --short HEAD
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+        OUTPUT_VARIABLE SDCPP_BUILD_COMMIT
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        ERROR_QUIET
+    )
+endif()
+
+if(NOT SDCPP_BUILD_VERSION)
+    set(SDCPP_BUILD_VERSION unknown)
+endif()
+message(STATUS "stable-diffusion.cpp version ${SDCPP_BUILD_VERSION}")
+
+if(NOT SDCPP_BUILD_COMMIT)
+    set(SDCPP_BUILD_COMMIT unknown)
+endif()
+message(STATUS "stable-diffusion.cpp commit ${SDCPP_BUILD_COMMIT}")
+
+set_property(
+  SOURCE ${CMAKE_CURRENT_SOURCE_DIR}/version.cpp
+  APPEND PROPERTY COMPILE_DEFINITIONS
+  SDCPP_BUILD_COMMIT=${SDCPP_BUILD_COMMIT} SDCPP_BUILD_VERSION=${SDCPP_BUILD_VERSION}
+)
+
 if(SD_BUILD_SHARED_LIBS)
     message("-- Build shared library")
     message(${SD_LIB_SOURCES})

examples/cli/main.cpp

@@ -1646,6 +1646,11 @@ void step_callback(int step, int frame_count, sd_image_t* image, bool is_noisy)
 }
 
 int main(int argc, const char* argv[]) {
+    for (int i = 1; i < argc; i++) {
+        if (strcmp(argv[1], "-v") == 0 || strcmp(argv[1], "--verbose") == 0) {
+            printf("stable-diffusion.cpp version %s, commit %s\n", sd_version(), sd_commit());
+        }
+    }
     SDParams params;
     parse_args(argc, argv, params);
     preview_path = params.preview_path;

stable-diffusion.h

@@ -353,6 +353,10 @@ SD_API bool preprocess_canny(sd_image_t image,
                              float strong,
                              bool inverse);
 
+SD_API const char * sd_commit(void);
+SD_API const char * sd_version(void);
+
+
 #ifdef __cplusplus
 }
 #endif

version.cpp

@@ -0,0 +1,22 @@
+#include "stable-diffusion.h"
+
+#ifndef SDCPP_BUILD_COMMIT
+#define SDCPP_BUILD_COMMIT unknown
+#endif
+
+#ifndef SDCPP_BUILD_VERSION
+#define SDCPP_BUILD_VERSION unknown
+#endif
+
+#define STRINGIZE2(x) #x
+#define STRINGIZE(x) STRINGIZE2(x)
+
+const char * sd_commit(void) {
+    return STRINGIZE(SDCPP_BUILD_COMMIT);
+}
+
+const char * sd_version(void) {
+    return STRINGIZE(SDCPP_BUILD_VERSION);
+}
+
+