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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
# We might be on a branch before the file was added.
if ! [ -x contrib/mklog.py ]; then exit 0; fi
# 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 [ $SHA1 = HEAD ]; then
cmd="diff --cached HEAD^"
if [ "$(git config gcc-config.mklog-hook-type)" = "smart-amend" ]; then
# Check if the existing message still describes the staged changes.
f=$(mktemp /tmp/git-commit.XXXXXX) || exit 1
git log -1 --pretty=email HEAD > $f
printf '\n---\n\n' >> $f
git $cmd >> $f
if contrib/gcc-changelog/git_email.py "$f" >/dev/null 2>&1; then
# Existing commit message is still OK for amended commit.
rm $f
exit 0
fi
rm $f
fi
else
cmd="diff --cached"
fi
else
# Do nothing for merge or squash.
exit 0
fi
# Save diff to a file if requested.
DIFF_FILE=$(git config gcc-config.diff-file)
if ! [ -z "$DIFF_FILE" ]; then
tee="tee $DIFF_FILE"
else
tee="cat"
fi
git $cmd | $tee | git gcc-mklog $GCC_MKLOG_ARGS -c "$COMMIT_MSG_FILE"
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