#!/bin/bash
#
# Copyrev - copies a revision from the Wireshark trunk to the current
# directory.
#
# Usage: backport-rev <svn revision>
#
# $Id$
#
# Copyright 2013 Gerald Combs
#
# 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.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#

if [ -z "$VISUAL" ] ; then
    VISUAL=$EDITOR
fi

#Check if pbcopy (or similar) is available...
if [ `builtin type -p pbcopy` ] ; then
    PBCOPY="pbcopy"
fi

if [ `builtin type -p xsel` ]  ; then
    PBCOPY="xsel --clipboard --input"
fi

if [ `builtin type -p putclip` ]  ; then
    PBCOPY="putclip"
fi

if [ -z "$PBCOPY" ] ; then
    echo "Can't find an clipboard copy. Check if pbcopy, xsel or putclip is installed in your system"
    exit 1
fi
function exit_err
{
    if [ -n "$*" ] ; then
        echo "$*"
    fi
    echo -n $patchfile | $PBCOPY
    echo "Patch saved to $patchfile and copied to pasteboard"
    if [ -n "$VISUAL" ] ; then
        "$VISUAL" $patchfile $logfile
    else
        echo "Can't find an editor. You'll have to open $patchfile and $logfile yourself."
    fi
    exit 1
}

subdir=""
trunk="trunk"

while getopts "at:" opt ; do
    case $opt in
        a)
            subdir="/asn1"
            ;;
        t)
            trunk="trunk-$OPTARG"
            ;;
        \?)
            echo "Unknown option -$OPTARG"
            ;;
    esac
done
shift $((OPTIND-1))

svninfo="`svn info | grep ^URL | cut -f2 -d' '`"
if [ -z "$svninfo" ] ; then
    exit_err "Can't find repository information. Are you running this from a Wireshark SVN directory?"
fi

svnurl=`dirname $svninfo`
svnurl="$svnurl/$trunk"
#svnurl="$HOME/Development/wireshark"

rev="$1"

patchfile="/tmp/copyrev-$rev.patch"
logfile="/tmp/copyrev-$rev.log"
oldrev=$(( $rev - 1 ))
echo "Working on r$rev ($oldrev)"

echo -n "Attempting 'svn merge' dry run. "
if [ -n "$subdir" ] ; then
    cd .$subdir
fi

svn diff --diff-cmd /usr/bin/diff -x "-w -b -U 5" -c $rev $svnurl$subdir \
    > $patchfile || exit_err "Error"

svn log -v -r $rev $svnurl | sed -e 's/^..*/  &/' > $logfile || exit 1

merge_ok="Giving up. You'll have to merge the patch yourself."
svn merge --dry-run -c$rev $svnurl | grep '^Summary' \
    > /dev/null 2>&1 || merge_ok="OK"

if [ "$merge_ok" != "OK" ] ; then
    dry_run_cmd="patch --batch --ignore-whitespace --strip=0 --dry-run"
    echo "Failed. Trying 'patch' dry run:"
    echo "    $dry_run_cmd < $patchfile"
    echo ""
    $dry_run_cmd < $patchfile
    echo ""
    exit_err "$merge_ok"
fi

echo "$merge_ok"
echo "Attempting 'svn merge' live run:"
svn merge -c$rev $svnurl

if [ -n "$subdir" ] ; then
    cd ..
fi
echo Done with r$rev

echo "Copy over revisions from the trunk:"
echo ""
uniq < $logfile

rm -v $patchfile $logfile

#
# Editor modelines  -  http://www.wireshark.org/tools/modelines.html
#
# Local variables:
# c-basic-offset: 4
# tab-width: 8
# indent-tabs-mode: nil
# End:
#
# vi: set shiftwidth=4 tabstop=8 expandtab:
# :indentSize=4:tabSize=8:noTabs=true:
#