Begin work on appimage for linux

Author: Ravbug

CMakeLists.txt

@@ -11,6 +11,10 @@ if(MSVC)
 endif()
 
 set(CMAKE_OSX_ARCHITECTURES "x86_64;arm64" CACHE INTERNAL "")
+# linux detection
+if(UNIX AND NOT APPLE)
+	set(LINUX TRUE CACHE INTERNAL "")
+endif()
 
 file(GLOB source "source/*.cpp" "source/*.hpp" "source/*.h")
 add_executable("${PROJECT_NAME}" WIN32 ${source} "source/wxmac.icns" "source/windows.rc")
@@ -50,6 +54,20 @@ if(APPLE)
 		" 
 		COMPONENT Runtime
 	)
+elseif(LINUX)
+INSTALL(CODE 
+	"include(../../appimage.cmake)
+	make_appimage(
+		EXE \"${CMAKE_INSTALL_PREFIX}/$<CONFIGURATION>/${PROJECT_NAME}\"
+		NAME \"${PROJECT_NAME}\"
+		ICON \"wxlin\"
+		DIR_ICON \"wxlin.xpm\"
+		OUTPUT_NAME \"${CMAKE_INSTALL_PREFIX}/$<CONFIGURATION>/${PROJECT_NAME}.AppImage\"
+		ASSETS \"\"
+	)
+	" 
+	COMPONENT Runtime
+	)
 endif()
 # windows app
 set_property(TARGET ${PROJECT_NAME} PROPERTY VS_DPI_AWARE "PerMonitor")

appimage.cmake

@@ -0,0 +1,70 @@
+function(make_appimage)
+	set(optional)
+	set(args EXE NAME DIR_ICON ICON OUTPUT_NAME)
+	set(list_args ASSETS)
+	cmake_parse_arguments(
+		PARSE_ARGV 0
+		ARGS
+		"${optional}"
+		"${args}"
+		"${list_args}"
+	)
+
+	if(${ARGS_UNPARSED_ARGUMENTS})
+		message(WARNING "Unparsed arguments: ${ARGS_UNPARSED_ARGUMENTS}")
+	endif()
+
+
+    # download AppImageTool if needed (TODO: non-x86 build machine?)
+    SET(AIT_PATH "${CMAKE_BINARY_DIR}/AppImageTool.AppImage" CACHE INTERNAL "")
+    if (NOT EXISTS "${AIT_PATH}")
+        file(DOWNLOAD https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage "${AIT_PATH}")
+        execute_process(COMMAND chmod +x ${AIT_PATH})
+    endif()
+
+    # make the AppDir
+    set(APPDIR "${CMAKE_BINARY_DIR}/AppDir")
+    file(REMOVE_RECURSE "${APPDIR}")       # remove if leftover
+    file(MAKE_DIRECTORY "${APPDIR}")
+
+    # copy executable to appdir
+    file(COPY "${ARGS_EXE}" DESTINATION "${APPDIR}" FOLLOW_SYMLINK_CHAIN)
+    get_filename_component(EXE_NAME "${ARGS_EXE}" NAME)
+
+    # create the script that will launch the AppImage
+file(WRITE "${APPDIR}/AppRun" 
+"#!/bin/sh
+cd \"$(dirname \"$0\")\";
+./${EXE_NAME} $@"
+    )
+    execute_process(COMMAND chmod +x "${APPDIR}/AppRun")
+    
+    # copy assets to appdir
+    file(COPY ${ARGS_ASSETS} DESTINATION "${APPDIR}")
+
+    # copy icon thumbnail
+    file(COPY ${ARGS_DIR_ICON} DESTINATION "${APPDIR}")
+    get_filename_component(THUMB_NAME "${ARGS_DIR_ICON}" NAME)
+    file(RENAME "${APPDIR}/${THUMB_NAME}" "${APPDIR}/.DirIcon")
+
+    # copy icon highres
+    file(COPY ${ARGS_ICON} DESTINATION "${APPDIR}")
+    get_filename_component(ICON_NAME "${ARGS_ICON}" NAME)
+    get_filename_component(ICON_EXT "${ARGS_ICON}" EXT)
+    file(RENAME "${APPDIR}/${ICON_NAME}" "${APPDIR}/${ARGS_NAME}${ICON_EXT}")
+
+    # Create the .desktop file
+    file(WRITE "${APPDIR}/${ARGS_NAME}.desktop" 
+    "[Desktop Entry]
+Type=Application
+Name=${ARGS_NAME}
+Icon=${ARGS_NAME}
+Categories=X-None;"    
+    )
+
+    # Invoke AppImageTool
+    execute_process(COMMAND ${AIT_PATH} ${APPDIR} ${ARGS_OUTPUT_NAME})
+    file(REMOVE_RECURSE "${APPDIR}")
+
+endfunction()
+