#!/bin/bash
#
# git-diff-subj - side-by-side diff of subject lines between two branches
#
#
# Copyright (C) 2007 Karel Zak <kzak@redhat.com>
#
# This file 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 file 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.
#

BRANCH_A="$1"
BRANCH_B="$2"

if [ -z "$BRANCH_A" -o -z "$BRANCH_B" ]; then
	echo "Usage: $0 <branche> <branch>"
	exit 1
fi

TMP_A=$(mktemp)
TMP_B=$(mktemp)

echo "$BRANCH_A								$BRANCH_B"; \
echo "--------------------------------------------------------------------------------------------"; \

git log --pretty=format:"%s" "$BRANCH_A" ^"$BRANCH_B" | sort > "$TMP_A"
git log --pretty=format:"%s" "$BRANCH_B" ^"$BRANCH_A" | sort > "$TMP_B"

diff --side-by-side --width=115 "$TMP_A" "$TMP_B"
rm -f "$TMP_A" "$TMP_B"