This plugin will launch a notification when a long running command finishes and terminal is not active.

It uses VTE's special sequence which is sent when shell prints the prompt. It depends on https://github.com/GNOME/vte/blob/vte-0-58/src/vte.sh (which has to be added to /etc/profile.d) and you need to ensure __vte_prompt_command is executed on PROMPT_COMMAND in Bash or in precmd_functions in Zsh.

Code is written in Hy and generated to Python3.