#!/bin/ash

PROC="/proc/asound/cards"

if [ ! -r "$PROC" ]; then
	echo "'${PROC}' not found or not readable."
	exit 1
fi

if [ -w "/etc" ]; then
	FILE="/etc/asound.conf"
elif [ -n "$HOME" ]; then
	FILE="${HOME}/.asoundrc"
else
	FILE="$(getent passwd root | awk -F ':' '{print $6}')/.asoundrc"
fi

if [ -e "${FILE}" -a "x$1" != "x--force" ]; then
	echo "'${FILE}' already exists, use --force to overwrite."
	exit 1
fi

# Try to filter HDMI cards first
CARD=$(grep -v -i 'HDMI' "${PROC}" | grep -E -o '^[[:space:]]*[0-9]+[[:space:]]+' | head -n 1)
# If empty, try again with all
[ -z "${CARD}" ] && CARD=$(cat "${PROC}" | grep -E -o '^[[:space:]]*[0-9]+[[:space:]]+' | head -n 1)

if [ -z "${CARD}" ]; then
	echo "No sound card found."
	exit 1
fi

cat > "${FILE}" <<HEREDOC
defaults.pcm.!card $CARD
defaults.ctl.!card $CARD

defaults.pcm.!device 0
defaults.ctl.!device 0

HEREDOC