#!/bin/sh

error() { echo "$@" 1>&2; }
fail() { [ $# -eq 0 ] || error "$@"; exit 1; }
Usage() {
   cat <<EOF
Usage: ${0##*/} tox-environment [command [args]]
   run command with provided arguments in the provided tox environment
   command defaults to \${SHELL:-/bin/sh}.

   invoke with '--list' to show available environments
EOF
}
list_toxes() {
   local td="$1" pre="$2" d=""
   ( cd "$tox_d" &&
     for d in *; do [ -f "$d/bin/activate" ] && echo "${pre}$d"; done)
}

[ $# -eq 0 ] && { Usage 1>&2; exit 1; }
[ "$1" = "-h" -o "$1" = "--help" ] && { Usage; exit 0; }

env="$1"
shift
tox_d="${0%/*}/../.tox"
activate="$tox_d/$env/bin/activate"


[ -d "$tox_d" ] || fail "$tox_d: not a dir. maybe run 'tox'?"

[ "$env" = "-l" -o "$env" = "--list" ] && { list_toxes ; exit ; }

if [ ! -f "$activate" ]; then
   error "$env: not a valid tox environment?"
   error "try one of:"
   list_toxes "$tox_d" "  "
   fail
fi
. "$activate"

[ "$#" -gt 0 ] || set -- ${SHELL:-/bin/bash}
debian_chroot="tox:$env" exec "$@"