Aleksey Samoilov
d8e0fa71c2
Original MR: https://gitlab.com/tile-os/tileos-settings-sway/-/merge_requests/21
38 lines
985 B
Bash
Executable file
38 lines
985 B
Bash
Executable file
#!/bin/bash
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#
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# This script implements the function of mirroring outputs.
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# It uses wl-mirror and Sway's ability to create headless outputs.
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#
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# The script is written as a singleton. It allows the user to run only one
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# instance of itself and kills all others. This is necessary so that wl-mirror
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# instances do not interfere with each other.
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SELF_NAME="$(basename "$0")"
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SELF_PID="$$"
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get_pgid() {
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ps -h -o "%r" -p "$1" | awk '{print $1}'
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}
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SELF_PGID="$(get_pgid "$SELF_PID")"
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kill_by_pgid() {
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pkill -"$2" -g "$1"
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}
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kill_copies() {
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mapfile -t pids < <(pgrep -u "$USER" -x "$SELF_NAME")
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for pid in "${pids[@]}" ; do
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pgid="$(get_pgid "$pid")"
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[[ $pgid -ne $SELF_PGID ]] && kill_by_pgid "$pgid" "INT"
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done
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}
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main() {
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# Don't single quote the trap's command!
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# It must be expanded when the trap is defined.
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# shellcheck disable=SC2064
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trap "kill_by_pgid $SELF_PGID TERM" INT
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kill_copies
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[[ "$1" != "-k" ]] && wl-mirror -F "${1:-HEADLESS-1}"
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}
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main "$@"
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