{pkgs ? import <nixpkgs> {} }:

pkgs.mkShell {
	buildInputs = [
		pkgs.cbonsai
		pkgs.cmatrix
		pkgs.neo-cowsay
		pkgs.fortune
		pkgs.nyancat
		pkgs.coreutils
		pkgs.sl
		pkgs.asciiquarium
		pkgs.pv
	];

	shellHook = ''
		LAST=""
		STIME=120
		programs="cmatrix cbonsai nyancat fortuneCow otherCow train fish"
	
		trap 'stty sane; tput cnorm; clear' EXIT

		while true; do
			while :; do
				choice=$(echo "$programs" | tr ' ' '\n' | shuf -n 1)
				[ "$choice" != "$LAST" ] && break
			done
			LAST="$choice"			

			clear
			tput sgr0
	
			case "$choice" in
				cbonsai)
					cbonsai -l -t 1 & pid=$!
					( sleep "$STIME" && kill $pid ) & watcher=$!
					wait $pid 2>/dev/null
					kill $watcher 2>/dev/null || true
					;;
				cmatrix)
					bash -c "cmatrix -u 4 & pid=\$!; sleep $STIME; kill -INT \$pid; wait \$pid"
					;;
				nyancat)
					timeout "$STIME" nyancat
					;;
				fortuneCow)
					fortune | cowsay
					sleep "$STIME" 
					;;
				otherCow)
					fortune | cowsay --random
					sleep "$STIME"
					;;
				train)
					sl
					;;
				fish)
					asciiquarium & pid=$!
					( sleep "$STIME" && kill $pid ) & watcher=$!
					wait $pid 2>/dev/null
					kill $watcher 2>/dev/null || true
					;;
				esac
				sleep 1
			done
	'';
}