lib: add version script

CMakeLists.txt

@@ -12,6 +12,18 @@ if(NOT DEFINED VERSION)
     endif()
 endif()
 
+if(NOT DEFINED GIT_REVISION)
+    execute_process(COMMAND git rev-parse HEAD
+        WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+        OUTPUT_VARIABLE GIT_REVISION
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+
+    if("${GIT_REVISION}" STREQUAL "")
+        message(FATAL_ERROR "GIT_REVISION is not set and failed to get from git")
+    endif()
+endif()
+
 string(REGEX REPLACE "^v" "" VERSION "${VERSION}")
 
 project(caelestia-shell VERSION ${VERSION} LANGUAGES CXX)
@@ -20,6 +32,7 @@ set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib")
 
+set(DISTRIBUTOR "Unset" CACHE STRING "Distributor")
 set(INSTALL_LIBDIR "usr/lib/caelestia" CACHE STRING "Library install dir")
 set(INSTALL_QMLDIR "usr/lib/qt6/qml" CACHE STRING "QML install dir")
 set(INSTALL_QSCONFDIR "etc/xdg/quickshell/caelestia" CACHE STRING "Quickshell config install dir")

assets/cpp/CMakeLists.txt

@@ -3,6 +3,16 @@ find_package(PkgConfig REQUIRED)
 pkg_check_modules(PIPEWIRE REQUIRED libpipewire-0.3)
 pkg_check_modules(AUBIO REQUIRED aubio)
 
+# Version
+add_executable(version version.cpp)
+target_compile_definitions(version PRIVATE
+    PROJECT_NAME="${PROJECT_NAME}"
+    VERSION="${VERSION}"
+    GIT_REVISION="${GIT_REVISION}"
+    DISTRIBUTOR="${DISTRIBUTOR}"
+)
+install(TARGETS version DESTINATION ${INSTALL_LIBDIR})
+
 # Beat detector
 add_executable(beat_detector beat-detector.cpp)
 target_include_directories(beat_detector PRIVATE ${PIPEWIRE_INCLUDE_DIRS} ${AUBIO_INCLUDE_DIRS})

assets/cpp/version.cpp

@@ -0,0 +1,26 @@
+#include <iostream>
+
+int main(int argc, char* argv[]) {
+    if (argc > 1) {
+        std::string arg = argv[1];
+
+        if (arg == "-t" || arg == "--terse") {
+            std::cout << PROJECT_NAME << std::endl;
+            std::cout << VERSION << std::endl;
+            std::cout << GIT_REVISION << std::endl;
+            std::cout << DISTRIBUTOR << std::endl;
+        } else if (arg == "-s" || arg == "--short") {
+            std::cout << PROJECT_NAME << " " << VERSION << ", revision " << GIT_REVISION << ", distrubuted by: " << DISTRIBUTOR << std::endl;
+        } else {
+            std::cout << "Usage: " << argv[0] << " [-t | --terse] [-s | --short]" << std::endl;
+            return arg != "-h" && arg != "--help";
+        }
+    } else {
+        std::cout << "Project: " << PROJECT_NAME << std::endl;
+        std::cout << "Version: " << VERSION << std::endl;
+        std::cout << "Git revision: " << GIT_REVISION << std::endl;
+        std::cout << "Distributor: " << DISTRIBUTOR << std::endl;
+    }
+
+    return 0;
+}

flake.nix

@@ -30,6 +30,7 @@
 
     packages = forAllSystems (pkgs: rec {
       caelestia-shell = pkgs.callPackage ./nix {
+        rev = self.rev or self.dirtyRev;
         quickshell = inputs.quickshell.packages.${pkgs.system}.default.override {
           withX11 = false;
           withI3 = false;

nix/default.nix

@@ -1,4 +1,5 @@
 {
+  rev,
   lib,
   stdenv,
   makeWrapper,
@@ -64,6 +65,12 @@
     fontDirectories = [material-symbols rubik nerd-fonts.caskaydia-cove];
   };
 
+  cmakeVersionFlags = [
+    (lib.cmakeFeature "VERSION" version)
+    (lib.cmakeFeature "GIT_REVISION" rev)
+    (lib.cmakeFeature "DISTRIBUTOR" "Nix Flake")
+  ];
+
   assets = stdenv.mkDerivation {
     name = "caelestia-assets";
     src = ./../assets/cpp;
@@ -71,7 +78,7 @@
     nativeBuildInputs = [cmake ninja pkg-config];
     buildInputs = [aubio pipewire];
 
-    cmakeFlags = [(lib.cmakeFeature "INSTALL_LIBDIR" "${placeholder "out"}/lib")];
+    cmakeFlags = [(lib.cmakeFeature "INSTALL_LIBDIR" "${placeholder "out"}/lib")] ++ cmakeVersionFlags;
   };
 
   plugin = stdenv.mkDerivation {
@@ -82,7 +89,7 @@
     buildInputs = [qt6.qtbase qt6.qtdeclarative];
 
     dontWrapQtApps = true;
-    cmakeFlags = [(lib.cmakeFeature "INSTALL_QMLDIR" qt6.qtbase.qtQmlPrefix)];
+    cmakeFlags = [(lib.cmakeFeature "INSTALL_QMLDIR" qt6.qtbase.qtQmlPrefix)] ++ cmakeVersionFlags;
   };
 in
   stdenv.mkDerivation {
@@ -96,11 +103,10 @@ in
 
     cmakeBuildType = "Release";
     cmakeFlags = [
-      (lib.cmakeFeature "VERSION" version)
       (lib.cmakeBool "DONT_BUILD_PLUGIN" true)
       (lib.cmakeBool "DONT_BUILD_ASSETS" true)
       (lib.cmakeFeature "INSTALL_QSCONFDIR" "${placeholder "out"}/share/caelestia-shell")
-    ];
+    ] ++ cmakeVersionFlags;
 
     prePatch = ''
       substituteInPlace assets/pam.d/fprint \