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#!/bin/sh
list_mode=false
while [ $# -gt 0 ]; do
case "$1" in
-l|--list)
list_mode=true
;;
*)
printf 'USAGE: %s [-l|--list]\n' "$0" >&2
exit 1
;;
esac
shift
done
escape() {
printf '%q ' "$@"
printf '\n'
}
read -r _Xorg xorg_user <<<"$(ps -eo comm,user | grep Xorg)"
if ! $list_mode && [ -e "$xorg_user" ]; then
printf '[%s] could not find owner of X session' "$0" >&2
exit 1
fi
[ "$USER" != "$xorg_user" ] && exec su --login "$xorg_user" -c "DISPLAY=$(escape "$DISPLAY") $(escape "$0" "$@")"
# per the EDID standard: http://read.pudn.com/downloads110/ebook/456020/E-EDID%20Standard.pdf
big_to_little_endian() {
little_endian=""
while read -rn2 byte; do
little_endian="${byte}${little_endian}"
done <<<"$1"
printf '%s\n' "$little_endian"
}
hex_to_dec() {
printf '%d\n' "0x${1}"
}
model_number() {
hex_to_dec "$(big_to_little_endian "${1:20:4}")"
}
serial_number() {
hex_to_dec "$(big_to_little_endian "${1:24:8}")"
}
state=start
{ xrandr --prop | grep -E '^[A-Za-z0-9-]+ connected|^[[:space:]]*[0-9a-f]+$'; printf 'EOF\n'; } | while read -r line; do
while true; do
case $state in
start)
if printf '%s\n' "$line" | grep -E '^[A-Za-z0-9-]+ connected' >/dev/null; then
state=edid
edid=""
output="$(printf '%s\n' "$line" | cut -f1 -d' ')"
fi
;;
edid)
if printf '%s\n' "$line" | grep -vE '^[[:space:]]*[0-9a-f]+$' >/dev/null; then
printf '%s %s %s\n' "$output" "$(model_number "$edid")" "$(serial_number "$edid")"
state=start
continue
fi
edid="${edid}${line}"
;;
esac
break
done
done | {
if $list_mode; then
cat
else
if ! [ -x "${XDG_CONFIG_HOME:-$HOME/.config}/auto-xrandr/configure-outputs" ]; then
printf '[%s] user %s does not have an auto-xrandr configuration\n' "$0" "$xorg_user" >&2
exit 1
fi
"${XDG_CONFIG_HOME:-$HOME/.config}/auto-xrandr/configure-outputs"
fi
}
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