~/.bin/ff: Use dmenu if rofi is not installed

.bin/ff

base="$PWD"
pattern='*.pdf'
choose_rofi() {
	rofi -dmenu -matching normal -sort -i -markup-rows
}
choose_dmenu() {
	dmenu -l 10 -i
}
choose=choose_rofi
if ! which rofi &> /dev/null; then
	choose=choose_dmenu
fi
while [ $# -gt 0 ]; do
	case "$1" in
		-no-open)
			pattern="$1"
			shift
			;;
		-dmenu)
			choose=choose_dmenu
			shift
			;;
		*)
			break
			;;
		;;
esac
file="$(find "$base" -type f -name "$pattern" -printf '%P\n' | rofi -dmenu -matching normal -sort -i -markup-rows)"
file="$(find "$base" -type f -name "$pattern" -printf '%P\n' | $choose)"
if [ "$?" -eq "0" ]; then
	$program "$base/$file"
fi