Fixes brndnmtthws#1068 : Add cmake uninstall target

CMakeLists.txt

@@ -104,3 +104,14 @@ if(CHECK_CODE_QUALITY)
   find_package(ClangTidy)
   find_package(ClangFormat)
 endif(CHECK_CODE_QUALITY)
+
+# uninstall target
+if(NOT TARGET uninstall)
+  configure_file(
+      "${CMAKE_MODULE_PATH}/UninstallConky.cmake.in"
+    "${CMAKE_BINARY_DIR}/cmake_uninstall.cmake"
+    IMMEDIATE @ONLY)
+
+  add_custom_target(uninstall
+    COMMAND ${CMAKE_COMMAND} -P ${CMAKE_BINARY_DIR}/cmake_uninstall.cmake)
+endif()

cmake/UninstallConky.cmake.in

@@ -0,0 +1,21 @@
+if(NOT EXISTS ${CMAKE_BINARY_DIR}/install_manifest.txt)
+  message(FATAL_ERROR "Cannot find install manifest: ${CMAKE_BINARY_DIR}/install_manifest.txt")
+endif()
+
+file(READ "${CMAKE_BINARY_DIR}/install_manifest.txt" files)
+string(REGEX REPLACE "\n" ";" files "${files}")
+foreach(file ${files})
+  message(STATUS "Uninstalling $ENV{DESTDIR}${file}")
+  if(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
+    exec_program(
+      ${CMAKE_COMMAND} ARGS "-E remove \"$ENV{DESTDIR}${file}\""
+      OUTPUT_VARIABLE rm_out
+      RETURN_VALUE rm_retval
+      )
+    if(NOT "${rm_retval}" STREQUAL 0)
+      message(FATAL_ERROR "Problem when removing $ENV{DESTDIR}${file}")
+    endif()
+  else(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
+    message(STATUS "File $ENV{DESTDIR}${file} does not exist.")
+  endif()
+endforeach()