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#!/bin/sh
# Check the format of GNU Emacs change log entries.
# Copyright 2014-2023 Free Software Foundation, Inc.
# This file is part of GNU Emacs.
# GNU Emacs 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 of the License, or
# (at your option) any later version.
# GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
# Written by Paul Eggert.
# Prefer gawk if available, as it handles NUL bytes properly.
if type gawk >/dev/null 2>&1; then
awk=gawk
else
awk=awk
fi
# Use a UTF-8 locale if available, so that the UTF-8 check works.
# Use U+00A2 CENT SIGN to test whether the locale works.
cent_sign_utf8_format='\302\242\n'
cent_sign=`printf "$cent_sign_utf8_format"`
print_at_sign='BEGIN {print substr("'$cent_sign'@", 2)}'
at_sign=`$awk "$print_at_sign" </dev/null 2>/dev/null`
if test "$at_sign" != @; then
at_sign=`LC_ALL=en_US.UTF-8 $awk "$print_at_sign" </dev/null 2>/dev/null`
if test "$at_sign" = @; then
LC_ALL=en_US.UTF-8
else
LC_ALL=C
fi
export LC_ALL
fi
# Check the log entry.
exec $awk -v at_sign="$at_sign" -v cent_sign="$cent_sign" -v file="$1" '
BEGIN {
# These regular expressions assume traditional Unix unibyte behavior.
# They are needed for old or broken versions of awk, e.g.,
# mawk 1.3.3 (1996), or gawk on MSYS (2015), and/or for systems that
# cannot use UTF-8 as the codeset for the locale.
space = "[ \f\n\r\t\v]"
non_space = "[^ \f\n\r\t\v]"
# The non_print below rejects control characters and surrogates
# UTF-8 for: 0x01-0x1f 0x7f 0x80-0x9f 0xd800-0xdbff 0xdc00-0xdfff
non_print = "[\1-\37\177]|\302[\200-\237]|\355[\240-\277][\200-\277]"
# Prefer POSIX regular expressions if available, as they do a
# better job of checking. Similarly, prefer POSIX negated
# expressions if UTF-8 also works.
if (" " ~ /[[:space:]]/) {
space = "[[:space:]]"
if (at_sign == "@" && cent_sign ~ /^[[:print:]]$/) {
non_space = "[^[:space:]]"
non_print = "[^[:print:]]"
}
}
c_lower = "abcdefghijklmnopqrstuvwxyz"
unsafe_gnu_url = "(http|ftp)://([" c_lower ".]*\\.)?(gnu|fsf)\\.org"
}
{ input[NR] = $0 }
/^#/ {
# Ignore every line after a scissors line.
if (/^# *---* *(>[8%]|[8%]<) *---* *$/) { exit }
# Ignore comment lines.
next
}
!/^.*$/ {
print "Invalid character (not UTF-8) in commit message"
status = 1
}
nlines == 0 && $0 !~ non_space { next }
{ nlines++ }
nlines == 1 {
# Ignore special markers used by "git rebase --autosquash".
if (! sub(/^fixup! /, ""))
sub(/^squash! /, "")
if ($0 ~ "^" space) {
print "White space at start of commit message'\''s first line"
status = 1
}
}
nlines == 2 && $0 ~ non_space {
print "Nonempty second line in commit message"
status = 1
}
{
# Expand tabs to spaces for length calculations etc.
while (match($0, /\t/)) {
before_tab = substr($0, 1, RSTART - 1)
after_tab = substr($0, RSTART + 1)
$0 = sprintf("%s%*s%s", before_tab, 8 - (RSTART - 1) % 8, "", after_tab)
}
}
78 < length && $0 ~ space {
print "Line longer than 78 characters in commit message"
status = 1
}
140 < length {
print "Word longer than 140 characters in commit message"
status = 1
}
/^Signed-off-by: / {
print "'\''Signed-off-by:'\'' in commit message"
status = 1
}
$0 ~ unsafe_gnu_url {
needs_rewriting = 1
}
$0 ~ non_print {
print "Unprintable character in commit message"
status = 1
}
END {
if (nlines == 0) {
print "Empty commit message"
status = 1
}
if (status == 0 && needs_rewriting) {
for (i = 1; i <= NR; i++) {
line = input[i]
while (match(line, unsafe_gnu_url)) {
prefix = substr(line, 1, RSTART - 1)
suffix = substr(line, RSTART)
line = prefix "https:" substr(suffix, 5 + (suffix ~ /^http:/))
}
print line >file
}
if (close(file) != 0) {
print "Cannot rewrite: " file
status = 1
}
}
if (status != 0) {
print "Commit aborted; please see the file 'CONTRIBUTE'"
}
exit status
}
' <"$1"
|
