#!/bin/sh

## This script will toggle HDMI Audio (and set video properly). To do this
## automatically when the cable is plugged, add the following udev rule (Linux
## only):
##
## $ cat /etc/udev/rules.d/hdmi.rules
## SUBSYSTEM=="drm", ACTION=="change", RUN+="/bin/sh /usr/local/bin/hdmi-switch"
##
## To get audio working on radeon, you may need to boot with the following
## kernel paremeter:
##
##   radeon.audio=1

if [ $(id -u) -ne 0 ]; then
    echo "You must be root to run this script."
    exit
fi

HDMI_STATUS="$(cat /sys/class/drm/card0-HDMI-A-1/status)"
ALSACONF="/etc/asound.conf"

HDMICARD="$(aplay -l | awk '/HDMI/ {sub(/:/,"",$2); sub(/:/,"",$7); printf "card " $2 "\ndevice " $7 "\n"}')"

[ -z "$HDMI_STATUS" ] && exit

udevadm settle --quiet --timeout=16

## Video
for i in $(xrandr | awk '/^[[:alnum:]-]+ connected/ {print $1}'); do
    xrandr --output "$i" --auto
done

## Sound
if [ "$HDMI_STATUS" = "connected" ]; then
    echo "pcm.!default {
  type hw
  $HDMICARD
}" > "$ALSACONF"

    chmod 644 "${ALSACONF}"
else
    rm -f "$ALSACONF"
fi