#!/usr/bin/env bash

EX_USAGE=64


function print_usage () {
	cat <<-EOF
		usage: code-review [--help] <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"

shift

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

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

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