Elixir/Phoenix Nix and script configuration

default.nix

with import <nixpkgs> {};

stdenv.mkDerivation rec {
	name = "env";
	env = buildEnv { name = name; paths = buildInputs; };
	buildInputs = [
		yarn
		nodejs-6_x
		elixir
		postgresql96
		inotify-tools
	];
}

scripts.sh

#!/bin/bash

set -e

PGDATA="`dirname $0`/db"

tools='yarn mix postgres pg_ctl'
for tool in $tools; do
	if [[ `which $tool` = "" ]]; then
		missing_tools="$missing_tools, $tool"
	fi
done

if [[ "$1" != "nix" ]]; then
if [[ "$missing_tools" != "" ]]; then
	echo "[-] Missing tools: ${missing_tools:2}. Trying running in nix:"
	echo ""
	echo "	$ $0 nix $@"
	echo ""
	exit
fi
fi

if [[ $1 == "setup" ]]; then
	echo "Starting db... Please Wait..."
	initdb -U postgres $PGDATA > /dev/null
	pg_ctl -D $PGDATA -l logfile start > /dev/null
	cd assets && yarn && ./node_modules/.bin/brunch build && cd ..
	mix do phx.digest, ecto.create, ecto.migrate
elif [[ $1 == "nix" ]]; then
	if [[ $2 == "nix" ]]; then
		echo "[-] You gave me '$0 $@', looks like you want to run nix inside nix, why?"
		exit
	fi
	
	nix-shell --command "$0 $2"
elif [[ $1 == "dev" ]]; then
	echo "[-] Starting database..."
	pg_ctl -D $PGDATA -l logfile start > /dev/null
	echo "[-] Starting phoenix server..."
	mix phx.server
elif [[ $1 == "prod" ]]; then
	echo "[-] Starting database..."
	pg_ctl -D $PGDATA -l logfile start > /dev/null
	echo "[-] Getting dependencies and compiling..."
	mix local.hex --force
	mix deps.get --only prod
	cd assets && ./node_modules/.bin/brunch build --production && cd ..
	MIX_ENV=prod mix do phx.digest, ecto.create, ecto.migrate
	echo "[-] Starting phoenix server in production mode..."
	MIX_ENV=prod PORT=4000 mix phx.server
elif [[ $1 == "stop" ]]; then
	echo "[-] Stopping db... Please Wait..."
	PGDATA=$PGDATA pg_ctl stop
elif [[ $1 == "clear" ]]; then
	$0 stop
	echo "[-] Clearing db... Please Wait..."
	rm -rf $PGDATA && \
	echo "[-] Database has been removed"
else
	echo "[-] Invalid argument, or none found. Options are:"
	echo "$0 setup     - create (if needed) and start the database, then run migrations"
	echo "$0 nix [cmd] - run the passed command inside the nix enviorment"
	echo "$0 dev       - start database and phoenix server"
	echo "$0 prod      - start database and phoenix server in production mode"
	echo "$0 stop      - to stop the database"
	echo "$0 clear     - to remove the database entirely"
fi