build: add git revision to version

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.20)
-project(quickshell VERSION "0.0.1")
+project(quickshell VERSION "0.1.0")
 
 set(QT_MIN_VERSION "6.6.0")
 set(CMAKE_CXX_STANDARD 20)
@@ -21,6 +21,14 @@ if (WAYLAND)
 	message(STATUS "    Session Lock: ${WAYLAND_SESSION_LOCK}")
 endif ()
 
+if (NOT DEFINED GIT_REVISION)
+	execute_process(
+		COMMAND git rev-parse HEAD
+		WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+		OUTPUT_VARIABLE GIT_REVISION
+	)
+endif()
+
 add_compile_options(-Wall -Wextra)
 
 # nix workaround

default.nix

@@ -11,6 +11,16 @@
   wayland,
   wayland-protocols,
 
+  gitRev ? (let
+    headExists = builtins.pathExists ./.git/HEAD;
+    headContent = builtins.readFile ./.git/HEAD;
+  in if headExists
+     then (let
+       matches = builtins.match "ref: refs/heads/(.*)\n" headContent;
+     in if matches != null
+        then builtins.readFile ./.git/refs/heads/${builtins.elemAt matches 0}
+        else headContent)
+     else "unknown"),
   debug ? false,
   enableWayland ? true,
 }: stdenv.mkDerivation {
@@ -44,7 +54,9 @@
     cmakeConfigurePhase
   '';
 
-  cmakeFlags = lib.optional (!enableWayland) "-DWAYLAND=OFF";
+  cmakeFlags = [
+    "-DGIT_REVISION=${gitRev}"
+  ] ++ lib.optional (!enableWayland) "-DWAYLAND=OFF";
 
   buildPhase = "ninjaBuildPhase";
   enableParallelBuilding = true;

src/core/CMakeLists.txt

@@ -17,6 +17,7 @@ qt_add_executable(quickshell
 	panelinterface.cpp
 )
 
+set_source_files_properties(main.cpp PROPERTIES COMPILE_DEFINITIONS GIT_REVISION="${GIT_REVISION}")
 qt_add_qml_module(quickshell URI Quickshell VERSION 0.1)
 
 target_link_libraries(quickshell PRIVATE ${QT_DEPS})

src/core/main.cpp

@@ -20,7 +20,7 @@
 int main(int argc, char** argv) {
 	const auto app = QGuiApplication(argc, argv);
 	QGuiApplication::setApplicationName("quickshell");
-	QGuiApplication::setApplicationVersion("0.1.0");
+	QGuiApplication::setApplicationVersion("0.1.0 (" GIT_REVISION ")");
 
 	QCommandLineParser parser;
 	parser.addHelpOption();