[thirdparty/gcc.git] / contrib / prepare-commit-msg

#!/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"
Commit	Line	Data
757dbb59 JM	1	#!/bin/sh
	2
	3	# Copyright (C) 2020 Free Software Foundation, Inc.
	4	#
	5	# This file is part of GCC.
	6	#
	7	# GCC is free software; you can redistribute it and/or modify
	8	# it under the terms of the GNU General Public License as published by
	9	# the Free Software Foundation; either version 3, or (at your option)
	10	# any later version.
	11	#
	12	# GCC is distributed in the hope that it will be useful,
	13	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	# GNU General Public License for more details.
	16	#
	17	# You should have received a copy of the GNU General Public License
	18	# along with GCC; see the file COPYING. If not, write to
	19	# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
	20	# Boston, MA 02110-1301, USA.
	21
	22	COMMIT_MSG_FILE=$1
	23	COMMIT_SOURCE=$2
	24	SHA1=$3
	25
9127b523 JW	26	# We might be on a branch before the file was added.
	27	if ! [ -x contrib/mklog.py ]; then exit 0; fi
	28
757dbb59 JM	29	# Can't do anything if $COMMIT_MSG_FILE isn't a file.
	30	if ! [ -f "$COMMIT_MSG_FILE" ]; then exit 0; fi
	31
	32	# Don't do anything unless requested to.
	33	if [ -z "$GCC_FORCE_MKLOG" ]; then exit 0; fi
	34
	35	if [ -z "$COMMIT_SOURCE" ] \|\| [ $COMMIT_SOURCE = template ]; then
	36	# No source or "template" means new commit.
	37	cmd="diff --cached"
	38
	39	elif [ $COMMIT_SOURCE = message ]; then
	40	# "message" means -m; assume a new commit if there are any changes staged.
	41	if ! git diff --cached --quiet; then
	42	cmd="diff --cached"
	43	else
	44	cmd="diff --cached HEAD^"
	45	fi
	46
	47	elif [ $COMMIT_SOURCE = commit ]; then
	48	# The message of an existing commit. If it's HEAD, assume --amend;
	49	# otherwise, assume a new commit with -C.
	50	if [ $SHA1 = HEAD ]; then
	51	cmd="diff --cached HEAD^"
df665e56 JW	52	if [ "$(git config gcc-config.mklog-hook-type)" = "smart-amend" ]; then
	53	# Check if the existing message still describes the staged changes.
	54	f=$(mktemp /tmp/git-commit.XXXXXX) \|\| exit 1
	55	git log -1 --pretty=email HEAD > $f
	56	printf '\n---\n\n' >> $f
	57	git $cmd >> $f
	58	if contrib/gcc-changelog/git_email.py "$f" >/dev/null 2>&1; then
	59	# Existing commit message is still OK for amended commit.
	60	rm $f
	61	exit 0
	62	fi
	63	rm $f
	64	fi
757dbb59 JM	65	else
	66	cmd="diff --cached"
	67	fi
	68	else
	69	# Do nothing for merge or squash.
	70	exit 0
	71	fi
	72
7b8ee33a	73	# Save diff to a file if requested.
8ff57396 ML	74	DIFF_FILE=$(git config gcc-config.diff-file)
	75	if ! [ -z "$DIFF_FILE" ]; then
	76	tee="tee $DIFF_FILE"
9aadfdd6 JW	77	else
9aadfdd6 JW	78	tee="cat"
7b8ee33a ML	79	fi
7b8ee33a ML	80
c2124b51	81	git $cmd \| $tee \| git gcc-mklog $GCC_MKLOG_ARGS -c "$COMMIT_MSG_FILE"