From 5934f5da9a39100f0a2baffac0eadc61d16e11cd Mon Sep 17 00:00:00 2001
From: Bartosz Taudul <wolf@nereid.pl>
Date: Sun, 8 Sep 2024 14:17:11 +0200
Subject: [PATCH] Generate git revision to a header file.

---
 extra/git-ref.py        | 24 ++++++++++++++++++++++++
 profiler/CMakeLists.txt |  6 ++++++
 2 files changed, 30 insertions(+)
 create mode 100644 extra/git-ref.py

diff --git a/extra/git-ref.py b/extra/git-ref.py
new file mode 100644
index 00000000..fa384fa3
--- /dev/null
+++ b/extra/git-ref.py
@@ -0,0 +1,24 @@
+#!/bin/env python3
+
+import filecmp
+import subprocess
+import os
+
+out = "GitRef.hpp"
+tmp = f"{out}.tmp"
+
+try:
+    ref = subprocess.run(["git", "rev-parse", "--short", "HEAD"], check=True, capture_output=True).stdout.decode().strip()
+except subprocess.CalledProcessError:
+    ref = "unknown"
+
+if not os.path.exists(out):
+    with open(out, "w") as f:
+        print(f"#pragma once\n\nnamespace tracy {{ static inline const char* GitRef = \"{ref}\"; }}", file=f)
+else:
+    with open(tmp, "w") as f:
+        print(f"#pragma once\n\nnamespace tracy {{ static inline const char* GitRef = \"{ref}\"; }}", file=f)
+    if not filecmp.cmp(out, tmp, shallow=False):
+        os.replace(tmp, out)
+    else:
+        os.unlink(tmp)
\ No newline at end of file
diff --git a/profiler/CMakeLists.txt b/profiler/CMakeLists.txt
index 2993dee6..ff284d65 100644
--- a/profiler/CMakeLists.txt
+++ b/profiler/CMakeLists.txt
@@ -174,6 +174,12 @@ endif()
 
 target_link_libraries(${PROJECT_NAME} PRIVATE TracyServer TracyImGui)
 
+add_custom_target(git-ref
+    COMMAND python3 ${CMAKE_CURRENT_LIST_DIR}/../extra/git-ref.py
+    BYPRODUCTS GitRef.hpp
+)
+add_dependencies(${PROJECT_NAME} git-ref)
+
 if(NOT EMSCRIPTEN)
     target_link_libraries(${PROJECT_NAME} PRIVATE TracyNfd)
     if (NOT USE_WAYLAND)