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Description:

ffsuspend 0.1

FFSuspend
A small script to monitor processes and i3 events in order to SIGSTOP GUI
processes when their X windows are not on a visible i3 workspace.
But WHY?!
I'm travelling a lot by train and use that time to work on stuff on my laptop.
I tend to keep open some programs, like a browser with some documentation or
library reference. However some programs, after being used for a while, tend to
consume up to one CPU core just for idling (looking at you, firefox), which
significantly lowers battery life and brings me in the uncomfortable situation
to have a constantly warm computer on my lap. So instead of tackling the root
cause, I went for the easiest route and this script is the result of that.
Dependencies
This is a hacky script that defers much of its functions by parsing the output
of some utility programs. These need to be installed for it to work:

i3-msg
killall
ps
xdotool
xsel

Caveats / Disclaimer
The X clipboard protocol is an IPC protocol that talks to the current owner of
the clipboard, whenever its contents is requested. If this process is
SIGSTOPed, applications tend to freeze indefinitely, whenever trying to read
the clipboard contents.
While there is probably a cleaner solution, FFSuspend has a hacky feature that
monitors clipboard contents and skips one cycle of stopping a process, when the
clipboard was changed while that process' window was visible. This can be
enabled with the -c commandline flag.
There may be other 'interesting' sideeffects when SIGSTOPing processes, so be
wary and use at your own risk.
License
FFSuspend is licensed under the GPLv3 or later, see LICENSE.txt.