I'm looking to run some code every time my laptop is plugged into, or unplugged from power. I know this can be done; for example, GNOME hooks into this functionality (somehow) to update the battery indicator in my toolbar. The code I want to execute is a simple shell script which switches between the integrated and discrete GPU depending on whether external power is available (a wrapper around
I'm specifically interested in knowing about ways to do this other than polling and parsing the output of e.g.
acpi -V to determine whether the battery is charging or not.