add osx support

CMakeLists.txt

@@ -1,13 +1,5 @@
 CMAKE_MINIMUM_REQUIRED(VERSION 3.12)
 
-#
-# Here we check whether mio is being configured in isolation or as a component
-# of a larger project. To do so, we query whether the `PROJECT_NAME` CMake
-# variable has been defined. In the case it has, we can conclude mio is a
-# subproject.
-#
-# This convention has been borrowed from the Catch C++ unit testing library.
-#
 if(DEFINED PROJECT_NAME)
   set(subproject ON)
 else()
@@ -18,7 +10,6 @@ PROJECT(tray C)
 
 SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 
-# Generate 'compile_commands.json' for clang_complete
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 IF(WIN32)
@@ -32,16 +23,43 @@ target_compile_features(tray_base INTERFACE c_std_99)
 
 if(WIN32)
 	include(WinApiLevels)
+	add_compile_definitions(TRAY_WINAPI=1)
 else()
     add_library(tray INTERFACE)
 	target_link_libraries(tray INTERFACE tray_base)
+
+	if(UNIX)
+		if(APPLE)
+			add_compile_definitions(TRAY_APPKIT=1)
+			find_library(Cocoa REQUIRED)
+		else()
+			PKG_CHECK_MODULES(APPINDICATOR REQUIRED appindicator3-0.1)
+			IF(APPINDICATOR_FOUND)
+				add_compile_definitions(TRAY_APPINDICATOR=1)
+			ENDIF()
+		endif()
+	endif()
 endif()
 
 add_library(tray::tray ALIAS tray)
 
-add_executable(tray_example example.c)
+file(GLOB src
+	${CMAKE_CURRENT_LIST_DIR}/*.c
+	${CMAKE_CURRENT_LIST_DIR}/*.h
+	${CMAKE_CURRENT_LIST_DIR}/*.ico
+	${CMAKE_CURRENT_LIST_DIR}/*.png)
+
+add_executable(tray_example ${src})
 target_link_libraries(tray_example INTERFACE tray_base)
 
+if(UNIX)
+	if(APPLE)
+		target_link_libraries(tray_example Cocoa)
+	else()
+		target_link_libraries(tray_example APPINDICATOR_STATIC_LIBRARIES)
+	endif()
+endif()
+
 IF(NOT WIN32)
 	INSTALL(FILES tray.h DESTINATION include)
 ENDIF()