#!/bin/sh -eu
#
# psvn - Wrapper to set Subversion properties automatically
#
# Copyright (c) 2012 Beat Gaetzi <beat@FreeBSD.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
#
# $FreeBSD$
#
# MAINTAINER=	mandree@FreeBSD.org
# beat@ has implicit approval to change this script.
#

#
# The psvn wrapper checkes from replaced, conflicting, missing or
# untracked files. When committing it adds the needed Subversion
# properties and removes unneeded ones.
# There is also adds a check subcommand which just executes the
# checks.
#

PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:${PATH}
export PATH

SVN="$(which svn)"
LF="$(printf '\nX')"
LF="${LF%X}"

VERSION=$("${SVN}" --version --quiet | sed -e 's,^\(.*\)\.\(.*\)\..*,\1\2,')
if [ ${VERSION} -lt 17 ] ;
then
	echo "===> Please consider upgrading to Subversion 1.7 (or newer)"
fi

checkstatus () {
	local IFS _error _file _status _statusline -
	_error=0
	eval "set -- $@"
	IFS="$LF"
	set -- $("${SVN}" status -- "$@")

	for _statusline
	do
		_status="$(printf '%.7s' "${_statusline}")"
		_file="${_statusline##????????}"

		case "${_status}" in
			R*)
				printf >&2 '===> Do not replace files as this will break the CVS exporter: "%s"\n' "${_file}"
				_error=1
			;;
			C*|?C*)
				printf >&2 '===> Conflict detected: \"%s\"\n' "${_file}"
				_error=1
			;;
			\~*)
				printf >&2 '===> Versioned item \"%s\" obstructed.\n' "${_file}"
				_error=1
			;;
			\?*)
				printf >&2 '===> Untracked new file "%s". Consider svn adding or deleting it.\n' "${_file}"
				_error=1
			;;
			\!*)
				printf >&2 '===> Missing file "%s". Consider re-adding or svn deleting it.\n' "${_file}"
				_error=1
			;;
		esac
	done

	if [ ${_error} -ne 0 ] ;
	then
		exit 1
	fi
}

setprop () {
	local _file -
	eval "set -- $1"

	for _file
	do
		if [ -d "${_file}" -o ! -e "${_file}" ] ;
		then
			continue
		fi
		printf >&2 '=> Adding svn keywords to "%s"\n' "${_file}"
		case $(egrep -- '\$FreeBSD\$|\$[BDFSer]+:' "${_file}" >/dev/null || echo $?) in
		"")	# matched pattern
			"${SVN}" -q -- propset svn:keywords "FreeBSD=%H" "${_file}"
			"${SVN}" -q -- propdel fbsd:nokeywords "${_file}"
			;;
		1)	# no match
			"${SVN}" -q -- propset fbsd:nokeywords yes "${_file}"
			"${SVN}" -q -- propdel svn:keywords "${_file}"
			;;
		*)	# egrep failed
			exit 1
			;;
		esac
		if [ "${_file##/*}" != "bsd.port.mk" ] ; then
			"${SVN}" -q -- propset svn:eol-style native "${_file}"
		fi
		"${SVN}" -q -- propset svn:mime-type text/plain "${_file}"
		"${SVN}" -q -- propdel cvs2svn:cvs-rev "${_file}"
	done
}

# taken from "Rich's sh (POSIX shell) tricks",
# a "Programming Guide[...]" at http://www.etalabs.net/sh_tricks.html
savearray() {
    for i do
	printf %s\\n "$i" | sed -e "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/"
    done
    echo " "
}

getfilequotedarray() {
	local varname IFS
	varname="$1"
	shift
	IFS="$LF"
	set -- $("${SVN}" status -- "$@" | sed 's/^....... //')
	eval "$varname=\$(savearray "\$@")"
}

for opt ; do
    case "${opt}" in
	-*) continue ;;
    esac
    case "${opt}" in
	check)
		shift
		if [ $# -gt 0 ] ; then
		    echo >&2 "===> Unsupported option before, or garbage after command"
		    exit 1
		fi
		getfilequotedarray "files" "$@"
		checkstatus "${files}"
		exit 0
	;;
	ci|commit)
		savedargs=$(savearray "$@")
		shift
		while getopts :qm:F: opt
		do
			case "$opt" in
				q) ;;
				m) ;;
				F) ;;
				\?) echo >&2 "===> Unsupported option -$OPTARG encountered. Abort."
				    exit 1 ;;
				:)  echo >&2 "===> Missing argument to option -$OPTARG. Abort."
				    exit 1 ;;
			esac
		done
		shift $(($OPTIND - 1))

		getfilequotedarray "files" "$@"
		checkstatus "${files}"
		setprop "${files}"

		eval "set -- $savedargs"
		exec "${SVN}" "$@"
	;;
	*)
		exec "${SVN}" "$@"
	;;
    esac
done