#!/bin/sh

name="unittest"
version="1.0"
help_message=$(/usr/bin/cat <<-EOF
	Wrapper around Python's 'unittest' module
	Usage: unittest TARGET [OPTIONS]
	Options:
	 -c, --color              print with color
	 -h, --help               print this message and exit
	 -v, --verbose            show verbose 'unittest' output
	 -V, --version            print version number and exit
	 -w, --working-directory  working directory for tests
EOF
)

target=""
single_target=0
color=0
verbose=0
working_directory="."
python_executable="/usr/bin/env python3"

while [ "$#" -gt 0 ]; do
  case "$1" in
  -c|--color)
    color=1
    shift
    ;;

  -h|--help)
    /usr/bin/printf "%s\n" "$help_message"
    exit 0
    ;;

  -d|--working-directory)
    working_directory="$2"
    shift
    shift
    ;;

  -v|--verbose)
    verbose=1
    shift
    ;;

  -V|--version)
    /usr/bin/printf "%s %s\n" "$name" "$version"
    exit 0
    ;;

  *)
    if [ -z "$target" ]; then
      target="$1"
    fi
    shift
    ;;
  esac
done

# unittest subroutine
unittest_subroutine() {
  if [ "$single_target" -eq 1 ]; then
    unittest_single_subroutine
  else
    unittest_discover_subroutine
  fi
}

# unittest single subroutine
unittest_single_subroutine() {
  if [ "$verbose" -eq 1 ]; then
    if ! $python_executable -m unittest -v "$target" 2>&1; then
      code=1
    fi
  else
    if ! $python_executable -m unittest "$target" 2>&1 \
        | /usr/bin/tail -n 1; then
      code=1
    fi
  fi
}

# unittest discover subroutine
unittest_discover_subroutine() {
  if [ "$verbose" -eq 1 ]; then
    if ! $python_executable -m unittest discover -v \
        -s "$target" -t "$working_directory" 2>&1; then
      code=1
    fi
  else
    if ! $python_executable -m unittest discover \
        -s "$target" -t "$working_directory" 2>&1 \
        | /usr/bin/tail -n 1; then
      code=1
    fi
  fi
}

error_msg() {
  (>&2 /usr/bin/printf "%s: %s\n" "$name" "$1")
}

# check directory
if [ -z "${target+x}" ]; then
  (>&2 /usr/bin/printf "Usage: unittest TARGET [OPTIONS]\n")
  exit 1
elif [ ! -d "$target" ]; then
  if /usr/bin/printf "%s\n" "$target" | grep -q -e ".*\.py"; then
    single_target=1
  else
    error_msg "No such directory '${target}'"
    exit 1
  fi
elif [ ! -d "$working_directory" ]; then
  error_msg "No such directory '${working_directory}'"
  exit 1
fi

# main routine
code=0
if [ "$color" -eq 0 ] || { [ -n "${NO_COLOR+x}" ] && [ "$NO_COLOR" -eq 1 ]; }; then
  unittest_subroutine
else
  unittest_subroutine | /usr/local/lib/unittest-color.awk
fi

# return stored code
exit "$code"