#!/bin/sh

help() { echo "envrun - run programs in an isolated home directory

USAGE:
	envrun [OPTION]... COMMAND

OPTIONS:
	-d ENVHOME   use the ENVHOME environment directory
	-h           show this help message"; }

while getopts 'd:h' o; do case "$o" in
	d) export ENVHOME="$OPTARG" ;;
	*) help >&2; exit ;;
esac done
shift $((OPTIND - 1))

export HOME="${ENVHOME:-"$PWD"}"
export XDG_CACHE_HOME="$HOME/.cache"
export XDG_CONFIG_HOME="$HOME/.config"
export XDG_DATA_HOME="$HOME/.local/share"
export XDG_STATE_HOME="$HOME/.local/state"

ensure_dirs() {
	for dir in "$@"; do
		[ -d "$dir" ] || { missing=1; break; }
	done

	[ "$missing" = 1 ] || return
	printf "\nFollowing directories will be created.\n\n"
	for dir in "$@"; do
		[ -d "$dir" ] || echo "$dir/"
	done

	printf "\ncontinue? [y/N] "
	read -r ans
	case "$ans" in
		y|Y) echo; mkdir -pv "$@"; echo ;;
		*) exit ;;
	esac
}

ensure_dirs \
	"$XDG_CACHE_HOME" \
	"$XDG_CONFIG_HOME" \
	"$XDG_DATA_HOME" \
	"$XDG_STATE_HOME"

[ "$#" -lt 1 ] && {
	echo "Please provide a command to run."
	exit
}

"$@"