kde-inhibit
Inhibit various desktop functions while a command runs.
TLDR
Inhibit power management
$ kde-inhibit --power [command] [command_arguments]
Inhibit screen saver
$ kde-inhibit --screenSaver [command] [command_arguments]
Launch VLC, and inhibit color correction (night mode) while it's running
$ kde-inhibit --colorCorrect [vlc]