#!/bin/bash
#
#  git-kickin.sh - helper app for quick git init (e.g. for creating patches)
#  Copyright (C) 2008  Clifford Wolf <clifford@clifford.at>
#
#  This program 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 2 of the License, or
#  (at your option) any later version.

help()
{
	echo "" >&2
	echo "Usage: $0 { <tar-file> | <tar-gz-file> | <tar-bz2-file> | . | auto-exclude }" >&2
	echo "" >&2
	echo "With tar-file as argument:" >&2
	echo "  Create a new .git directory. Use the content of the tar file (minus" >&2
	echo "  top-level directory) as tree for the automatic initial commit." >&2
	echo "" >&2
	echo "With dot as argument:" >&2
	echo "  Create a new .git directory. Use the content of working directory as" >&2
	echo "  tree for the automatic initial commit. " >&2
	echo "" >&2
	echo "With 'auto-exclude' as argument:" >&2
	echo "  Add all unknown files to .git/info/exclude file." >&2
	echo "" >&2
	exit 1
}

if (
	if [ "$1" = "auto-exclude" ]; then
		set -ex
		git ls-files -o >> .git/info/exclude
	elif [ "$1" = "." ]; then
		set -ex
		git init
		git add .
		git commit -m init
	else
		if [ -z "$1" -o ! -f "$1" -o -e .git ]; then
			help
		fi

		case "$1" in
			*.tar)
				set -ex
				mkdir git-kickin-tmp
				tar x -C git-kickin-tmp -f - < "$1" ;;
			*.tar.gz)
				set -ex
				mkdir git-kickin-tmp
				tar x -z -C git-kickin-tmp -f - < "$1" ;;
			*.tar.bz2)
				set -ex
				mkdir git-kickin-tmp
				tar x -j -C git-kickin-tmp -f - < "$1" ;;
			*)
				help ;;
		esac

		cd git-kickin-tmp/*
		git init
		git add .
		git commit -m init
		cd ../..

		mv git-kickin-tmp/*/.git .
		rm -rf git-kickin-tmp
	fi
); then
	echo "READY."
	exit 0
else
	exit 1
fi