From b68e1c3a40aa116f0c6236114be79bd79f472258 Mon Sep 17 00:00:00 2001
From: James Le Cuirot <chewi@gentoo.org>
Date: Fri, 17 Oct 2025 22:08:50 +0100
Subject: [PATCH] cmake: Determine installation paths dynamically

Use pkg-config data, then systemd-path, then respect GNUInstallDirs.
CMAKE_INSTALL_LIBDIR is not used because that is the
architecture-specific directory (e.g. lib64).

Signed-off-by: James Le Cuirot <chewi@gentoo.org>
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,8 @@
 cmake_minimum_required(VERSION 3.13)
 project(joycond)
 
+include(GNUInstallDirs)
+
 set(CMAKE_CXX_STANDARD 17)
 
 # Generate compile_commands.json
@@ -25,19 +27,41 @@ target_link_libraries(
 
 add_subdirectory(src)
 
-install(TARGETS joycond DESTINATION /usr/bin/
+install(TARGETS joycond DESTINATION "${CMAKE_INSTALL_BINDIR}"
         PERMISSIONS OWNER_WRITE OWNER_READ OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
         )
-install(FILES udev/89-joycond.rules udev/72-joycond.rules DESTINATION /usr/lib/udev/rules.d/
-        PERMISSIONS OWNER_WRITE OWNER_READ GROUP_READ WORLD_READ 
+
+pkg_get_variable(UDEV_RULES_PATH udev udev_dir)
+if(NOT UDEV_RULES_PATH)
+    set(UDEV_RULES_PATH "${CMAKE_INSTALL_PREFIX}/lib/udev")
+endif()
+install(FILES udev/89-joycond.rules udev/72-joycond.rules DESTINATION "${UDEV_RULES_PATH}/rules.d/"
+        PERMISSIONS OWNER_WRITE OWNER_READ GROUP_READ WORLD_READ
         )
-install(FILES systemd/joycond.service DESTINATION /usr/lib/systemd/system
+
+pkg_get_variable(SYSTEMD_SYSTEM_UNIT_PATH systemd systemd_system_unit_dir)
+if(NOT SYSTEMD_SYSTEM_UNIT_PATH)
+    execute_process(COMMAND systemd-path systemd-system-unit OUTPUT_VARIABLE SYSTEMD_SYSTEM_UNIT_PATH OUTPUT_STRIP_TRAILING_WHITESPACE RESULT_VARIABLE UNIT_RETVAL)
+    if(NOT UNIT_RETVAL EQUAL 0)
+        set(SYSTEMD_SYSTEM_UNIT_PATH "${CMAKE_INSTALL_PREFIX}/lib/systemd/system")
+    endif()
+endif()
+install(FILES systemd/joycond.service DESTINATION "${SYSTEMD_SYSTEM_UNIT_PATH}"
         PERMISSIONS OWNER_WRITE OWNER_READ GROUP_READ WORLD_READ
         )
-install(FILES systemd/joycond.conf DESTINATION /etc/modules-load.d
+
+pkg_get_variable(SYSTEMD_MODULES_LOAD_PATH systemd modules_load_dir)
+if(NOT SYSTEMD_MODULES_LOAD_PATH)
+    execute_process(COMMAND systemd-path modules-load OUTPUT_VARIABLE SYSTEMD_MODULES_LOAD_PATH OUTPUT_STRIP_TRAILING_WHITESPACE RESULT_VARIABLE MODULES_RETVAL)
+    if(NOT MODULES_RETVAL EQUAL 0)
+        set(SYSTEMD_MODULES_LOAD_PATH "${CMAKE_INSTALL_PREFIX}/lib/modules-load.d")
+    endif()
+endif()
+install(FILES systemd/joycond.conf DESTINATION "${SYSTEMD_MODULES_LOAD_PATH}"
         PERMISSIONS OWNER_WRITE OWNER_READ GROUP_READ WORLD_READ
         )
+
 install(FILES data/com.github.DanielOgorchock.joycond.metainfo.xml
-        DESTINATION /usr/share/metainfo
+        DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/metainfo"
         PERMISSIONS OWNER_WRITE OWNER_READ GROUP_READ WORLD_READ
         )
-- 
2.51.0