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551 lines
17 KiB
Perl
Executable File
551 lines
17 KiB
Perl
Executable File
#!/bin/sh
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#! -*-perl-*-
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# Convert git log output to ChangeLog format.
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# Copyright (C) 2008-2024 Free Software Foundation, Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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# Written by Jim Meyering
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# This is a prologue that allows running a perl script as an executable
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# on systems that are compliant to a POSIX version before POSIX:2017.
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# On such systems, the usual invocation of an executable through execlp()
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# or execvp() fails with ENOEXEC if it is a script that does not start
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# with a #! line. The script interpreter mentioned in the #! line has
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# to be /bin/sh, because on GuixSD systems that is the only program that
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# has a fixed file name. The second line is essential for perl and is
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# also useful for editing this file in Emacs. The next two lines below
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# are valid code in both sh and perl. When executed by sh, they re-execute
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# the script through the perl program found in $PATH. The '-x' option
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# is essential as well; without it, perl would re-execute the script
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# through /bin/sh. When executed by perl, the next two lines are a no-op.
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eval 'exec perl -wSx "$0" "$@"'
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if 0;
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my $VERSION = '2024-07-17 02:20'; # UTC
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# The definition above must lie within the first 8 lines in order
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# for the Emacs time-stamp write hook (at end) to update it.
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# If you change this file with Emacs, please let the write hook
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# do its job. Otherwise, update this string manually.
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(my $copyright_year = $VERSION) =~ s/^(\d*)-.*$/$1/;
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use strict;
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use warnings;
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use Getopt::Long;
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use POSIX qw(strftime);
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(my $ME = $0) =~ s|.*/||;
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# use File::Coda; # https://meyering.net/code/Coda/
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END {
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defined fileno STDOUT or return;
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close STDOUT and return;
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warn "$ME: failed to close standard output: $!\n";
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$? ||= 1;
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}
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sub usage ($)
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{
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my ($exit_code) = @_;
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my $STREAM = ($exit_code == 0 ? *STDOUT : *STDERR);
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if ($exit_code != 0)
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{
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print $STREAM "Try '$ME --help' for more information.\n";
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}
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else
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{
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print $STREAM <<EOF;
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Usage: $ME [OPTIONS] [ARGS]
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Convert git log output to ChangeLog format. If present, any ARGS
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are passed to "git log". To avoid ARGS being parsed as options to
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$ME, they may be preceded by '--'.
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OPTIONS:
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--amend=FILE FILE maps from an SHA1 to perl code (i.e., s/old/new/) that
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makes a change to SHA1's commit log text or metadata.
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--append-dot append a dot to the first line of each commit message if
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there is no other punctuation or blank at the end.
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--no-cluster never cluster commit messages under the same date/author
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header; the default is to cluster adjacent commit messages
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if their headers are the same and neither commit message
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contains multiple paragraphs.
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--srcdir=DIR the root of the source tree, from which the .git/
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directory can be derived.
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--since=DATE convert only the logs since DATE;
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the default is to convert all log entries.
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--until=DATE convert only the logs older than DATE.
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--ignore-matching=PAT ignore commit messages whose first lines match PAT.
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--ignore-line=PAT ignore lines of commit messages that match PAT.
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--format=FMT set format string for commit subject and body;
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see 'man git-log' for the list of format metacharacters;
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the default is '%s%n%b%n'
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--strip-tab remove one additional leading TAB from commit message lines.
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--strip-cherry-pick remove data inserted by "git cherry-pick";
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this includes the "cherry picked from commit ..." line,
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and the possible final "Conflicts:" paragraph.
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--commit-timezone use dates respecting the timezone commits were made in.
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--help display this help and exit
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--version output version information and exit
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EXAMPLE:
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$ME --since=2008-01-01 > ChangeLog
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$ME -- -n 5 foo > last-5-commits-to-branch-foo
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SPECIAL SYNTAX:
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The following types of strings are interpreted specially when they appear
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at the beginning of a log message line. They are not copied to the output.
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Copyright-paperwork-exempt: Yes
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Append the "(tiny change)" notation to the usual "date name email"
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ChangeLog header to mark a change that does not require a copyright
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assignment.
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Co-authored-by: Joe User <user\@example.com>
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List the specified name and email address on a second
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ChangeLog header, denoting a co-author.
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Signed-off-by: Joe User <user\@example.com>
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These lines are simply elided.
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In a FILE specified via --amend, comment lines (starting with "#") are ignored.
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FILE must consist of <SHA,CODE+> pairs where SHA is a 40-byte SHA1 (alone on
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a line) referring to a commit in the current project, and CODE refers to one
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or more consecutive lines of Perl code. Pairs must be separated by one or
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more blank line.
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Here is sample input for use with --amend=FILE, from coreutils:
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3a169f4c5d9159283548178668d2fae6fced3030
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# fix typo in title:
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s/all tile types/all file types/
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1379ed974f1fa39b12e2ffab18b3f7a607082202
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# Due to a bug in vc-dwim, I mis-attributed a patch by Paul to myself.
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# Change the author to be Paul. Note the escaped "@":
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s,Jim .*>,Paul Eggert <eggert\\\@cs.ucla.edu>,
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Send patches and bug reports to <bug-gnulib\@gnu.org>.
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EOF
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}
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exit $exit_code;
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}
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sub print_version ()
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{
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print "$ME version $VERSION\n";
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print "Copyright (C) $copyright_year Free Software Foundation, Inc.\n";
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print "License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>\n"
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. "This is free software: you are free to change and redistribute it.\n"
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. "There is NO WARRANTY, to the extent permitted by law.\n";
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print "\n";
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my $author = "Jim Meyering";
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print "Written by $author.\n";
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}
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# If the string $S is a well-behaved file name, simply return it.
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# If it contains white space, quotes, etc., quote it, and return the new string.
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sub shell_quote($)
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{
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my ($s) = @_;
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if ($s =~ m![^\w+/.,-]!)
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{
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# Convert each single quote to '\''
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$s =~ s/\'/\'\\\'\'/g;
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# Then single quote the string.
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$s = "'$s'";
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}
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return $s;
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}
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sub quoted_cmd(@)
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{
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return join (' ', map {shell_quote $_} @_);
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}
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# Parse file F.
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# Comment lines (starting with "#") are ignored.
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# F must consist of <SHA,CODE+> pairs where SHA is a 40-byte SHA1
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# (alone on a line) referring to a commit in the current project, and
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# CODE refers to one or more consecutive lines of Perl code.
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# Pairs must be separated by one or more blank line.
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sub parse_amend_file($)
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{
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my ($f) = @_;
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open F, '<', $f
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or die "$ME: $f: failed to open for reading: $!\n";
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my $fail;
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my $h = {};
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my $in_code = 0;
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my $sha;
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while (defined (my $line = <F>))
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{
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$line =~ /^\#/
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and next;
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chomp $line;
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$line eq ''
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and $in_code = 0, next;
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if (!$in_code)
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{
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$line =~ /^([[:xdigit:]]{40})$/
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or (warn "$ME: $f:$.: invalid line; expected an SHA1\n"),
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$fail = 1, next;
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$sha = lc $1;
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$in_code = 1;
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exists $h->{$sha}
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and (warn "$ME: $f:$.: duplicate SHA1\n"),
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$fail = 1, next;
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}
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else
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{
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$h->{$sha} ||= '';
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$h->{$sha} .= "$line\n";
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}
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}
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close F;
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$fail
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and exit 1;
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return $h;
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}
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# git_dir_option $SRCDIR
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#
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# From $SRCDIR, the --git-dir option to pass to git (none if $SRCDIR
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# is undef). Return as a list (0 or 1 element).
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sub git_dir_option($)
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{
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my ($srcdir) = @_;
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my @res = ();
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if (defined $srcdir)
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{
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my $qdir = shell_quote $srcdir;
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my $cmd = "cd $qdir && git rev-parse --show-toplevel";
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my $qcmd = shell_quote $cmd;
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my $git_dir = qx($cmd);
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defined $git_dir
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or die "$ME: cannot run $qcmd: $!\n";
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$? == 0
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or die "$ME: $qcmd had unexpected exit code or signal ($?)\n";
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chomp $git_dir;
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push @res, "--git-dir=$git_dir/.git";
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}
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@res;
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}
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{
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my $since_date;
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my $until_date;
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my $format_string = '%s%n%b%n';
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my $amend_file;
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my $append_dot = 0;
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my $cluster = 1;
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my $ignore_matching;
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my $ignore_line;
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my $strip_tab = 0;
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my $strip_cherry_pick = 0;
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my $commit_timezone = 0;
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my $srcdir;
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GetOptions
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(
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help => sub { usage 0 },
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version => sub { print_version; exit },
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'since=s' => \$since_date,
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'until=s' => \$until_date,
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'format=s' => \$format_string,
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'amend=s' => \$amend_file,
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'append-dot' => \$append_dot,
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'cluster!' => \$cluster,
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'ignore-matching=s' => \$ignore_matching,
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'ignore-line=s' => \$ignore_line,
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'strip-tab' => \$strip_tab,
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'strip-cherry-pick' => \$strip_cherry_pick,
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'commit-timezone' => \$commit_timezone,
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'srcdir=s' => \$srcdir,
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) or usage 1;
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defined $since_date
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and unshift @ARGV, "--since=$since_date";
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defined $until_date
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and unshift @ARGV, "--until=$until_date";
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# This is a hash that maps an SHA1 to perl code (i.e., s/old/new/)
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# that makes a correction in the log or attribution of that commit.
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my $amend_code = defined $amend_file ? parse_amend_file $amend_file : {};
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my $commit_time_format = $commit_timezone ? '%cI' : '%ct';
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my @cmd = ('git',
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git_dir_option $srcdir,
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qw(log --log-size),
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("--pretty=format:%H:$commit_time_format"
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. ' %an <%ae>%n%n'.$format_string, @ARGV));
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open PIPE, '-|', @cmd
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or die ("$ME: failed to run '". quoted_cmd (@cmd) ."': $!\n"
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. "(Is your Git too old? Version 1.5.1 or later is required.)\n");
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my $prev_multi_paragraph;
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my $prev_date_line = '';
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my @prev_coauthors = ();
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my @skipshas = ();
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while (1)
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{
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defined (my $in = <PIPE>)
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or last;
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$in =~ /^log size (\d+)$/
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or die "$ME:$.: Invalid line (expected log size):\n$in";
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my $log_nbytes = $1;
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my $log;
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my $n_read = read PIPE, $log, $log_nbytes;
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$n_read == $log_nbytes
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or die "$ME:$.: unexpected EOF\n";
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# Extract leading hash.
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my ($sha, $rest) = split ':', $log, 2;
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defined $sha
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or die "$ME:$.: malformed log entry\n";
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$sha =~ /^[[:xdigit:]]{40}$/
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or die "$ME:$.: invalid SHA1: $sha\n";
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my $skipflag = 0;
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if (@skipshas)
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{
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foreach(@skipshas)
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{
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if ($sha =~ /^$_/)
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{
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$skipflag = $_;
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last;
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}
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}
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}
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# If this commit's log requires any transformation, do it now.
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my $code = $amend_code->{$sha};
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if (defined $code)
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{
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eval 'use Safe';
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my $s = new Safe;
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# Put the unpreprocessed entry into "$_".
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$_ = $rest;
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# Let $code operate on it, safely.
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my $r = $s->reval("$code")
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or die "$ME:$.:$sha: failed to eval \"$code\":\n$@\n";
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# Note that we've used this entry.
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delete $amend_code->{$sha};
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# Update $rest upon success.
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$rest = $_;
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}
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# Remove lines inserted by "git cherry-pick".
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if ($strip_cherry_pick)
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{
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$rest =~ s/^\s*Conflicts:\n.*//sm;
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$rest =~ s/^\s*\(cherry picked from commit [\da-f]+\)\n//m;
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}
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my @line = split /[ \t]*\n/, $rest;
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my $author_line = shift @line;
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defined $author_line
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or die "$ME:$.: unexpected EOF\n";
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$author_line =~ /^(\S+) (.*>)$/
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or die "$ME:$.: Invalid line "
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. "(expected date/author/email):\n$author_line\n";
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# Author <email>
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my $author = $2;
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my $commit_date = $1;
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if (! $commit_timezone)
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{
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# Seconds since the Epoch.
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$commit_date = strftime "%Y-%m-%d", localtime ($commit_date);
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}
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else
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{
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# ISO 8601 date.
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$commit_date =~ s/T.*$//;
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}
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# Format 'Copyright-paperwork-exempt: Yes' as a standard ChangeLog
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# '(tiny change)' annotation.
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my $tiny = (grep (/^(?:Copyright-paperwork-exempt|Tiny-change):\s+[Yy]es$/, @line)
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? ' (tiny change)' : '');
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my $date_line = "$commit_date $author$tiny\n";
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my @coauthors = grep /^Co-authored-by:.*$/, @line;
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# Omit meta-data lines we've already interpreted.
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@line = grep !/^(?:Signed-off-by:[ ].*>$
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|Co-authored-by:[ ]
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|Copyright-paperwork-exempt:[ ]
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|Tiny-change:[ ]
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)/x, @line;
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# Remove leading and trailing blank lines.
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if (@line)
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{
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while ($line[0] =~ /^\s*$/) { shift @line; }
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while ($line[$#line] =~ /^\s*$/) { pop @line; }
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}
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# Handle Emacs gitmerge.el "skipped" commits.
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# Yes, this should be controlled by an option. So sue me.
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if ( grep /^(; )?Merge from /, @line )
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{
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my $found = 0;
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foreach (@line)
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{
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if (grep /^The following commit.*skipped:$/, $_)
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{
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$found = 1;
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## Reset at each merge to reduce chance of false matches.
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@skipshas = ();
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next;
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}
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if ($found && $_ =~ /^([[:xdigit:]]{7,}) [^ ]/)
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{
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push ( @skipshas, $1 );
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}
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}
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}
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# Ignore commits that match the --ignore-matching pattern, if specified.
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if (defined $ignore_matching && @line && $line[0] =~ /$ignore_matching/)
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{
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$skipflag = 1;
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}
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elsif ($skipflag)
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{
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## Perhaps only warn if a pattern matches more than once?
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warn "$ME: warning: skipping $sha due to $skipflag\n";
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}
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if (! $skipflag)
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{
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if (defined $ignore_line && @line)
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{
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@line = grep ! /$ignore_line/, @line;
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while ($line[$#line] =~ /^\s*$/) { pop @line; }
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}
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# Record whether there are two or more paragraphs.
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my $multi_paragraph = grep /^\s*$/, @line;
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# Format 'Co-authored-by: A U Thor <email@example.com>' lines in
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# standard multi-author ChangeLog format.
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for (@coauthors)
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{
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s/^Co-authored-by:\s*/\t /;
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s/\s*</ </;
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/<.*?@.*\..*>/
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or warn "$ME: warning: missing email address for "
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. substr ($_, 5) . "\n";
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}
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# If clustering of commit messages has been disabled, if this header
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# would be different from the previous date/name/etc. header,
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# or if this or the previous entry consists of two or more paragraphs,
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# then print the header.
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if ( ! $cluster
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|| $date_line ne $prev_date_line
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|| "@coauthors" ne "@prev_coauthors"
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|| $multi_paragraph
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|| $prev_multi_paragraph)
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{
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$prev_date_line eq ''
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or print "\n";
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print $date_line;
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@coauthors
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and print join ("\n", @coauthors), "\n";
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}
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$prev_date_line = $date_line;
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@prev_coauthors = @coauthors;
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$prev_multi_paragraph = $multi_paragraph;
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# If there were any lines
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if (@line == 0)
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{
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warn "$ME: warning: empty commit message:\n"
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. " commit $sha\n $date_line\n";
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}
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else
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{
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if ($append_dot)
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{
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# If the first line of the message has enough room, then
|
|
if (length $line[0] < 72)
|
|
{
|
|
# append a dot if there is no other punctuation or blank
|
|
# at the end.
|
|
$line[0] =~ /[[:punct:]\s]$/
|
|
or $line[0] .= '.';
|
|
}
|
|
}
|
|
|
|
# Remove one additional leading TAB from each line.
|
|
$strip_tab
|
|
and map { s/^\t// } @line;
|
|
|
|
# Prefix each non-empty line with a TAB.
|
|
@line = map { length $_ ? "\t$_" : '' } @line;
|
|
|
|
print "\n", join ("\n", @line), "\n";
|
|
}
|
|
}
|
|
|
|
defined ($in = <PIPE>)
|
|
or last;
|
|
$in ne "\n"
|
|
and die "$ME:$.: unexpected line:\n$in";
|
|
}
|
|
|
|
close PIPE
|
|
or die "$ME: error closing pipe from " . quoted_cmd (@cmd) . "\n";
|
|
# FIXME-someday: include $PROCESS_STATUS in the diagnostic
|
|
|
|
# Complain about any unused entry in the --amend=F specified file.
|
|
my $fail = 0;
|
|
foreach my $sha (sort keys %$amend_code)
|
|
{
|
|
warn "$ME:$amend_file: unused entry: $sha\n";
|
|
$fail = 1;
|
|
}
|
|
|
|
exit $fail;
|
|
}
|
|
|
|
# Local Variables:
|
|
# mode: perl
|
|
# indent-tabs-mode: nil
|
|
# eval: (add-hook 'before-save-hook 'time-stamp nil t)
|
|
# time-stamp-line-limit: 50
|
|
# time-stamp-start: "my $VERSION = '"
|
|
# time-stamp-format: "%:y-%02m-%02d %02H:%02M"
|
|
# time-stamp-time-zone: "UTC0"
|
|
# time-stamp-end: "'; # UTC"
|
|
# End:
|