Accept signals to quit-and-save, with no UI prompts
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#188 Accept signals to quit-and-save, with no UI prompts
Accept a signal (e.g., SIGUSR1) which asks Tux Paint to shut down gracefully, and save work, no questions asked.
Motivation: Flavio Airundo uses Tux Paint in labs full of Linux systems with young children who don't necessarily know how, or remember to, save their work at the end. He currently utilizes kill via SSH to shut down Tux Paint.
A normal SIGTERM will be caught by Tux Paint, and bring up a prompt (in the UI) to ask whether or not to quit. If --autosave is used, Tux Paint will not bother asking about saving upon quit, if the current drawing has not been saved yet. If --saveover or --saveovernew is used, Tux Paint will not bother asking about overwriting the existing image, if it had been saved before, but modified since.
It's probably too much to ask users who might want this feature to always require a "save over" option be chosen, so perhaps SIGUSR1 could be for always saving a new file (avoid upsetting loss of data) and SIGUSR2 to always save over the existing (avoid extra files). "Auto save" should be implied, however; the administrator could just use SIGKILL (kill -9) if they didn't care.
Implemented in https://sourceforge.net/p/tuxpaint/tuxpaint/ci/99b566ae2697136e3d4a9cfccc466e2a5cd7f3d6/