redis-up-mac.nix
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redis-up-mac.nix
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	{ lib
	, redis
	, writeShellApplication
	, writeTextFile
	}:

	let
	# Use small script executed by bash to have a normal shell environment.
	redis-entrypoint = writeShellApplication {
	name = "redis-init";
	text = ''
	REDIS_CACHE_DIR=''${XDG_CACHE_HOME:-$HOME/Library/Caches}/Redis
	mkdir -p "$REDIS_CACHE_DIR"

	echo "View Redis Logs: tail -f $REDIS_CACHE_DIR/logs" >&2
	echo "Kill Redis server: pkill redis" >&2

	# Explicitly close fd3 to prevent `direnv` from hanging
	# (https://linear.app/comm/issue/ENG-3254/remove-wait-logic-in-nix-develop)
	exec 3>&-

	# We want to launch from `$REDIS_CACHE_DIR` so `dump.rdp` will
	# be persisted there instead of in the root of the repo.
	cd "$REDIS_CACHE_DIR"

	# 'exec' allows for us to replace bash process with Redis
	exec ${redis}/bin/redis-server \
	&> "$REDIS_CACHE_DIR"/logs
	'';
	};

	# will create a shellchecked executable shell script located in $out/bin/<name>
	# This shell script will be used to allow for impure+stateful actions
	in writeShellApplication {
	name = "redis-up";
	text = ''
	# so use XDG conventions and hope $HOME doesn't have a space.
	REDIS_CACHE_DIR=''${XDG_CACHE_HOME:-$HOME/Library/Caches}/Redis
	REDIS_PIDFILE="$REDIS_CACHE_DIR"/redis.pid

	mkdir -p "$REDIS_CACHE_DIR"

	"${../scripts/start_comm_daemon.sh}" \
	redis \
	Redis \
	"${redis-entrypoint}/bin/redis-init" \
	"$REDIS_PIDFILE"

	# Explicitly exit this script so the parent shell can determine
	# when it's safe to return control of terminal to user
	exit 0
	'';
	}