gcc/contrib/prepare-commit-msg
Martin Liska 7b8ee33aff
prepare-commit-msg: Save diff if requested by user.
contrib/ChangeLog:

	* prepare-commit-msg: Save diff to a file if
	the GCC_GIT_DIFF_FILE variable is set.
2020-05-27 10:12:58 +02:00

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#!/bin/sh
# Copyright (C) 2020 Free Software Foundation, Inc.
#
# This file is part of GCC.
#
# GCC 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 3, or (at your option)
# any later version.
#
# GCC 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 GCC; see the file COPYING. If not, write to
# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.
COMMIT_MSG_FILE=$1
COMMIT_SOURCE=$2
SHA1=$3
# Can't do anything if $COMMIT_MSG_FILE isn't a file.
if ! [ -f "$COMMIT_MSG_FILE" ]; then exit 0; fi
# Don't do anything unless requested to.
if [ -z "$GCC_FORCE_MKLOG" ]; then exit 0; fi
if [ -z "$COMMIT_SOURCE" ] || [ $COMMIT_SOURCE = template ]; then
# No source or "template" means new commit.
cmd="diff --cached"
elif [ $COMMIT_SOURCE = message ]; then
# "message" means -m; assume a new commit if there are any changes staged.
if ! git diff --cached --quiet; then
cmd="diff --cached"
else
cmd="diff --cached HEAD^"
fi
elif [ $COMMIT_SOURCE = commit ]; then
# The message of an existing commit. If it's HEAD, assume --amend;
# otherwise, assume a new commit with -C.
if [ $SHA1 = HEAD ]; then
cmd="diff --cached HEAD^"
else
cmd="diff --cached"
fi
else
# Do nothing for merge or squash.
exit 0
fi
# Save diff to a file if requested.
if ! [ -z "$GCC_GIT_DIFF_FILE" ]; then
git $cmd > "$GCC_GIT_DIFF_FILE";
fi
git $cmd | git gcc-mklog -c "$COMMIT_MSG_FILE"