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#!/bin/bash
# PURPOSE: when I touch a middle-button at my headset directly connected
# to Lenovo T530, I want to trigger a custom action (screen lock)
hook_on() {
{ xscreensaver-command -restart || ( xscreensaver& ) ; true; }
sleep 1
xscreensaver-command -lock
}
hook_off() {
true
}
status=0
trap 'status=1' USR1
while read line; do
case "$line" in
"card 0, #19 (0,0,0,Mic Jack,0) VALUE"*)
#echo 0, $status
[ $status -ne 0 ] || status=1;;
"card 0, #13 (2,0,0,Mic Boost Volume,0) VALUE"*)
#echo 2, $status
[ $status -ne 1 ] || status=2
[ $status -ne 20 ] || status=21;;
"card 0, #15 (2,0,0,Internal Mic Boost Volume,0) VALUE"*)
#echo 3, $status
[ $status -ne 2 ] || status=3
[ $status -ne 1 ] || status=20;;
"card 0, #12 (2,0,0,Capture Switch,0) VALUE"*)
#echo 4, $status
[ $status -ne 4 ] || { hook_on; status=0; }
[ $status -ne 3 ] || status=4
[ $status -ne 21 ] || { hook_off; status=0; };;
*)
#echo 5
status=0;;
esac
{ sleep 1; kill -USR1 $$; } &
done < <(script -qc 'alsactl monitor' /dev/null)
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