#!/usr/bin/env bash

# Copyright (c) 2019  Teddy Wing
#
# This file is part of Code Review.
#
# Code Review is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Code Review is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Code Review. If not, see <https://www.gnu.org/licenses/>.

EX_USAGE=64

VERSION=0.0.1


function print_usage () {
	cat <<-EOF
		usage: code-review [--help] [--version] <command> [<args>]

		Commands:

		changed-files   List names of files changed
		commits         One-line log of commits
		diff            Unified diff of changes
		difftool        Diff of all changes with Vim and Fugitive
		start           Start a review with a given base revision
		stat            Stat file changes
	EOF
}

function program_exists () {
	local program="$1"

	command -v "$program" > /dev/null
}


program="code-review"
subcommand="$1"

if [ -z "$subcommand" ] || [ "$1" = '--help' ] || [ "$1" = '-h' ]; then
	print_usage
	exit "$EX_USAGE"
fi

if [ "$1" = '--version' ]; then
	echo "$VERSION"
	exit 0
fi

if ! program_exists "${program}-${subcommand}"; then
	echo >&2 "${program}: '${subcommand}' is not a ${program} command. See '${program} --help'"
	exit "$EX_USAGE"
fi

shift
eval "${program}-${subcommand}" "$@"