| 1 | #!/bin/sh
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| 2 | #! -*-perl-*-
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| 3 |
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| 4 | # Convert git log output to ChangeLog format.
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| 5 |
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| 6 | # Copyright (C) 2008-2022 Free Software Foundation, Inc.
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| 7 | #
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| 8 | # This program is free software: you can redistribute it and/or modify
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| 9 | # it under the terms of the GNU General Public License as published by
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| 10 | # the Free Software Foundation, either version 3 of the License, or
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| 11 | # (at your option) any later version.
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| 12 | #
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| 13 | # This program is distributed in the hope that it will be useful,
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| 14 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | # GNU General Public License for more details.
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| 17 | #
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| 18 | # You should have received a copy of the GNU General Public License
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| 19 | # along with this program. If not, see <https://www.gnu.org/licenses/>.
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| 20 | #
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| 21 | # Written by Jim Meyering
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| 22 |
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| 23 | # This is a prologue that allows to run a perl script as an executable
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| 24 | # on systems that are compliant to a POSIX version before POSIX:2017.
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| 25 | # On such systems, the usual invocation of an executable through execlp()
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| 26 | # or execvp() fails with ENOEXEC if it is a script that does not start
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| 27 | # with a #! line. The script interpreter mentioned in the #! line has
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| 28 | # to be /bin/sh, because on GuixSD systems that is the only program that
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| 29 | # has a fixed file name. The second line is essential for perl and is
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| 30 | # also useful for editing this file in Emacs. The next two lines below
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| 31 | # are valid code in both sh and perl. When executed by sh, they re-execute
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| 32 | # the script through the perl program found in $PATH. The '-x' option
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| 33 | # is essential as well; without it, perl would re-execute the script
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| 34 | # through /bin/sh. When executed by perl, the next two lines are a no-op.
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| 35 | eval 'exec perl -wSx "$0" "$@"'
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| 36 | if 0;
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| 37 |
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| 38 | my $VERSION = '2022-01-27 18:49'; # UTC
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| 39 | # The definition above must lie within the first 8 lines in order
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| 40 | # for the Emacs time-stamp write hook (at end) to update it.
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| 41 | # If you change this file with Emacs, please let the write hook
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| 42 | # do its job. Otherwise, update this string manually.
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| 43 |
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| 44 | use strict;
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| 45 | use warnings;
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| 46 | use Getopt::Long;
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| 47 | use POSIX qw(strftime);
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| 48 |
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| 49 | (my $ME = $0) =~ s|.*/||;
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| 50 |
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| 51 | # use File::Coda; # https://meyering.net/code/Coda/
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| 52 | END {
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| 53 | defined fileno STDOUT or return;
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| 54 | close STDOUT and return;
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| 55 | warn "$ME: failed to close standard output: $!\n";
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| 56 | $? ||= 1;
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| 57 | }
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| 58 |
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| 59 | sub usage ($)
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| 60 | {
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| 61 | my ($exit_code) = @_;
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| 62 | my $STREAM = ($exit_code == 0 ? *STDOUT : *STDERR);
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| 63 | if ($exit_code != 0)
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| 64 | {
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| 65 | print $STREAM "Try '$ME --help' for more information.\n";
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| 66 | }
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| 67 | else
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| 68 | {
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| 69 | print $STREAM <<EOF;
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| 70 | Usage: $ME [OPTIONS] [ARGS]
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| 71 |
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| 72 | Convert git log output to ChangeLog format. If present, any ARGS
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| 73 | are passed to "git log". To avoid ARGS being parsed as options to
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| 74 | $ME, they may be preceded by '--'.
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| 75 |
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| 76 | OPTIONS:
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| 77 |
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| 78 | --amend=FILE FILE maps from an SHA1 to perl code (i.e., s/old/new/) that
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| 79 | makes a change to SHA1's commit log text or metadata.
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| 80 | --append-dot append a dot to the first line of each commit message if
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| 81 | there is no other punctuation or blank at the end.
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| 82 | --no-cluster never cluster commit messages under the same date/author
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| 83 | header; the default is to cluster adjacent commit messages
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| 84 | if their headers are the same and neither commit message
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| 85 | contains multiple paragraphs.
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| 86 | --srcdir=DIR the root of the source tree, from which the .git/
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| 87 | directory can be derived.
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| 88 | --since=DATE convert only the logs since DATE;
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| 89 | the default is to convert all log entries.
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| 90 | --until=DATE convert only the logs older than DATE.
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| 91 | --ignore-matching=PAT ignore commit messages whose first lines match PAT.
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| 92 | --ignore-line=PAT ignore lines of commit messages that match PAT.
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| 93 | --format=FMT set format string for commit subject and body;
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| 94 | see 'man git-log' for the list of format metacharacters;
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| 95 | the default is '%s%n%b%n'
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| 96 | --strip-tab remove one additional leading TAB from commit message lines.
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| 97 | --strip-cherry-pick remove data inserted by "git cherry-pick";
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| 98 | this includes the "cherry picked from commit ..." line,
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| 99 | and the possible final "Conflicts:" paragraph.
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| 100 | --help display this help and exit
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| 101 | --version output version information and exit
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| 102 |
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| 103 | EXAMPLE:
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| 104 |
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| 105 | $ME --since=2008-01-01 > ChangeLog
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| 106 | $ME -- -n 5 foo > last-5-commits-to-branch-foo
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| 107 |
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| 108 | SPECIAL SYNTAX:
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| 109 |
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| 110 | The following types of strings are interpreted specially when they appear
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| 111 | at the beginning of a log message line. They are not copied to the output.
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| 112 |
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| 113 | Copyright-paperwork-exempt: Yes
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| 114 | Append the "(tiny change)" notation to the usual "date name email"
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| 115 | ChangeLog header to mark a change that does not require a copyright
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| 116 | assignment.
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| 117 | Co-authored-by: Joe User <user\@example.com>
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| 118 | List the specified name and email address on a second
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| 119 | ChangeLog header, denoting a co-author.
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| 120 | Signed-off-by: Joe User <user\@example.com>
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| 121 | These lines are simply elided.
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| 122 |
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| 123 | In a FILE specified via --amend, comment lines (starting with "#") are ignored.
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| 124 | FILE must consist of <SHA,CODE+> pairs where SHA is a 40-byte SHA1 (alone on
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| 125 | a line) referring to a commit in the current project, and CODE refers to one
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| 126 | or more consecutive lines of Perl code. Pairs must be separated by one or
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| 127 | more blank line.
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| 128 |
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| 129 | Here is sample input for use with --amend=FILE, from coreutils:
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| 130 |
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| 131 | 3a169f4c5d9159283548178668d2fae6fced3030
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| 132 | # fix typo in title:
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| 133 | s/all tile types/all file types/
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| 134 |
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| 135 | 1379ed974f1fa39b12e2ffab18b3f7a607082202
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| 136 | # Due to a bug in vc-dwim, I mis-attributed a patch by Paul to myself.
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| 137 | # Change the author to be Paul. Note the escaped "@":
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| 138 | s,Jim .*>,Paul Eggert <eggert\\\@cs.ucla.edu>,
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| 139 |
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| 140 | EOF
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| 141 | }
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| 142 | exit $exit_code;
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| 143 | }
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| 144 |
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| 145 | # If the string $S is a well-behaved file name, simply return it.
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| 146 | # If it contains white space, quotes, etc., quote it, and return the new string.
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| 147 | sub shell_quote($)
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| 148 | {
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| 149 | my ($s) = @_;
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| 150 | if ($s =~ m![^\w+/.,-]!)
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| 151 | {
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| 152 | # Convert each single quote to '\''
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| 153 | $s =~ s/\'/\'\\\'\'/g;
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| 154 | # Then single quote the string.
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| 155 | $s = "'$s'";
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| 156 | }
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| 157 | return $s;
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| 158 | }
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| 159 |
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| 160 | sub quoted_cmd(@)
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| 161 | {
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| 162 | return join (' ', map {shell_quote $_} @_);
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| 163 | }
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| 164 |
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| 165 | # Parse file F.
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| 166 | # Comment lines (starting with "#") are ignored.
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| 167 | # F must consist of <SHA,CODE+> pairs where SHA is a 40-byte SHA1
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| 168 | # (alone on a line) referring to a commit in the current project, and
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| 169 | # CODE refers to one or more consecutive lines of Perl code.
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| 170 | # Pairs must be separated by one or more blank line.
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| 171 | sub parse_amend_file($)
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| 172 | {
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| 173 | my ($f) = @_;
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| 174 |
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| 175 | open F, '<', $f
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| 176 | or die "$ME: $f: failed to open for reading: $!\n";
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| 177 |
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| 178 | my $fail;
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| 179 | my $h = {};
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| 180 | my $in_code = 0;
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| 181 | my $sha;
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| 182 | while (defined (my $line = <F>))
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| 183 | {
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| 184 | $line =~ /^\#/
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| 185 | and next;
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| 186 | chomp $line;
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| 187 | $line eq ''
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| 188 | and $in_code = 0, next;
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| 189 |
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| 190 | if (!$in_code)
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| 191 | {
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| 192 | $line =~ /^([[:xdigit:]]{40})$/
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| 193 | or (warn "$ME: $f:$.: invalid line; expected an SHA1\n"),
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| 194 | $fail = 1, next;
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| 195 | $sha = lc $1;
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| 196 | $in_code = 1;
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| 197 | exists $h->{$sha}
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| 198 | and (warn "$ME: $f:$.: duplicate SHA1\n"),
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| 199 | $fail = 1, next;
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| 200 | }
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| 201 | else
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| 202 | {
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| 203 | $h->{$sha} ||= '';
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| 204 | $h->{$sha} .= "$line\n";
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| 205 | }
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| 206 | }
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| 207 | close F;
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| 208 |
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| 209 | $fail
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| 210 | and exit 1;
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| 211 |
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| 212 | return $h;
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| 213 | }
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| 214 |
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| 215 | # git_dir_option $SRCDIR
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| 216 | #
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| 217 | # From $SRCDIR, the --git-dir option to pass to git (none if $SRCDIR
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| 218 | # is undef). Return as a list (0 or 1 element).
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| 219 | sub git_dir_option($)
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| 220 | {
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| 221 | my ($srcdir) = @_;
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| 222 | my @res = ();
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| 223 | if (defined $srcdir)
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| 224 | {
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| 225 | my $qdir = shell_quote $srcdir;
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| 226 | my $cmd = "cd $qdir && git rev-parse --show-toplevel";
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| 227 | my $qcmd = shell_quote $cmd;
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| 228 | my $git_dir = qx($cmd);
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| 229 | defined $git_dir
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| 230 | or die "$ME: cannot run $qcmd: $!\n";
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| 231 | $? == 0
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| 232 | or die "$ME: $qcmd had unexpected exit code or signal ($?)\n";
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| 233 | chomp $git_dir;
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| 234 | push @res, "--git-dir=$git_dir/.git";
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| 235 | }
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| 236 | @res;
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| 237 | }
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| 238 |
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| 239 | {
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| 240 | my $since_date;
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| 241 | my $until_date;
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| 242 | my $format_string = '%s%n%b%n';
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| 243 | my $amend_file;
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| 244 | my $append_dot = 0;
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| 245 | my $cluster = 1;
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| 246 | my $ignore_matching;
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| 247 | my $ignore_line;
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| 248 | my $strip_tab = 0;
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| 249 | my $strip_cherry_pick = 0;
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| 250 | my $srcdir;
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| 251 | GetOptions
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| 252 | (
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| 253 | help => sub { usage 0 },
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| 254 | version => sub { print "$ME version $VERSION\n"; exit },
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| 255 | 'since=s' => \$since_date,
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| 256 | 'until=s' => \$until_date,
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| 257 | 'format=s' => \$format_string,
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| 258 | 'amend=s' => \$amend_file,
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| 259 | 'append-dot' => \$append_dot,
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| 260 | 'cluster!' => \$cluster,
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| 261 | 'ignore-matching=s' => \$ignore_matching,
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| 262 | 'ignore-line=s' => \$ignore_line,
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| 263 | 'strip-tab' => \$strip_tab,
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| 264 | 'strip-cherry-pick' => \$strip_cherry_pick,
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| 265 | 'srcdir=s' => \$srcdir,
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| 266 | ) or usage 1;
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| 267 |
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| 268 | defined $since_date
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| 269 | and unshift @ARGV, "--since=$since_date";
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| 270 | defined $until_date
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| 271 | and unshift @ARGV, "--until=$until_date";
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| 272 |
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| 273 | # This is a hash that maps an SHA1 to perl code (i.e., s/old/new/)
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| 274 | # that makes a correction in the log or attribution of that commit.
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| 275 | my $amend_code = defined $amend_file ? parse_amend_file $amend_file : {};
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| 276 |
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| 277 | my @cmd = ('git',
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| 278 | git_dir_option $srcdir,
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| 279 | qw(log --log-size),
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| 280 | '--pretty=format:%H:%ct %an <%ae>%n%n'.$format_string, @ARGV);
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| 281 | open PIPE, '-|', @cmd
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| 282 | or die ("$ME: failed to run '". quoted_cmd (@cmd) ."': $!\n"
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| 283 | . "(Is your Git too old? Version 1.5.1 or later is required.)\n");
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| 284 |
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| 285 | my $prev_multi_paragraph;
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| 286 | my $prev_date_line = '';
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| 287 | my @prev_coauthors = ();
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| 288 | my @skipshas = ();
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| 289 | while (1)
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| 290 | {
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| 291 | defined (my $in = <PIPE>)
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| 292 | or last;
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| 293 | $in =~ /^log size (\d+)$/
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| 294 | or die "$ME:$.: Invalid line (expected log size):\n$in";
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| 295 | my $log_nbytes = $1;
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| 296 |
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| 297 | my $log;
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| 298 | my $n_read = read PIPE, $log, $log_nbytes;
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| 299 | $n_read == $log_nbytes
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| 300 | or die "$ME:$.: unexpected EOF\n";
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| 301 |
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| 302 | # Extract leading hash.
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| 303 | my ($sha, $rest) = split ':', $log, 2;
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| 304 | defined $sha
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| 305 | or die "$ME:$.: malformed log entry\n";
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| 306 | $sha =~ /^[[:xdigit:]]{40}$/
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| 307 | or die "$ME:$.: invalid SHA1: $sha\n";
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| 308 |
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| 309 | my $skipflag = 0;
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| 310 | if (@skipshas)
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| 311 | {
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| 312 | foreach(@skipshas)
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| 313 | {
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| 314 | if ($sha =~ /^$_/)
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| 315 | {
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| 316 | $skipflag = $_;
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| 317 | last;
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| 318 | }
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| 319 | }
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| 320 | }
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| 321 |
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| 322 | # If this commit's log requires any transformation, do it now.
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| 323 | my $code = $amend_code->{$sha};
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| 324 | if (defined $code)
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| 325 | {
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| 326 | eval 'use Safe';
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| 327 | my $s = new Safe;
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| 328 | # Put the unpreprocessed entry into "$_".
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| 329 | $_ = $rest;
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| 330 |
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| 331 | # Let $code operate on it, safely.
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| 332 | my $r = $s->reval("$code")
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| 333 | or die "$ME:$.:$sha: failed to eval \"$code\":\n$@\n";
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| 334 |
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| 335 | # Note that we've used this entry.
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| 336 | delete $amend_code->{$sha};
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| 337 |
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| 338 | # Update $rest upon success.
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| 339 | $rest = $_;
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| 340 | }
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| 341 |
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| 342 | # Remove lines inserted by "git cherry-pick".
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| 343 | if ($strip_cherry_pick)
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| 344 | {
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| 345 | $rest =~ s/^\s*Conflicts:\n.*//sm;
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| 346 | $rest =~ s/^\s*\(cherry picked from commit [\da-f]+\)\n//m;
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| 347 | }
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| 348 |
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| 349 | my @line = split /[ \t]*\n/, $rest;
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| 350 | my $author_line = shift @line;
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| 351 | defined $author_line
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| 352 | or die "$ME:$.: unexpected EOF\n";
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| 353 | $author_line =~ /^(\d+) (.*>)$/
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| 354 | or die "$ME:$.: Invalid line "
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| 355 | . "(expected date/author/email):\n$author_line\n";
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| 356 |
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| 357 | # Format 'Copyright-paperwork-exempt: Yes' as a standard ChangeLog
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| 358 | # `(tiny change)' annotation.
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| 359 | my $tiny = (grep (/^(?:Copyright-paperwork-exempt|Tiny-change):\s+[Yy]es$/, @line)
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| 360 | ? ' (tiny change)' : '');
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| 361 |
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| 362 | my $date_line = sprintf "%s %s$tiny\n",
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| 363 | strftime ("%Y-%m-%d", localtime ($1)), $2;
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| 364 |
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| 365 | my @coauthors = grep /^Co-authored-by:.*$/, @line;
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| 366 | # Omit meta-data lines we've already interpreted.
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| 367 | @line = grep !/^(?:Signed-off-by:[ ].*>$
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| 368 | |Co-authored-by:[ ]
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| 369 | |Copyright-paperwork-exempt:[ ]
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| 370 | |Tiny-change:[ ]
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| 371 | )/x, @line;
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| 372 |
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| 373 | # Remove leading and trailing blank lines.
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| 374 | if (@line)
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| 375 | {
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| 376 | while ($line[0] =~ /^\s*$/) { shift @line; }
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| 377 | while ($line[$#line] =~ /^\s*$/) { pop @line; }
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| 378 | }
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| 379 |
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| 380 | # Handle Emacs gitmerge.el "skipped" commits.
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| 381 | # Yes, this should be controlled by an option. So sue me.
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| 382 | if ( grep /^(; )?Merge from /, @line )
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| 383 | {
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| 384 | my $found = 0;
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| 385 | foreach (@line)
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| 386 | {
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| 387 | if (grep /^The following commit.*skipped:$/, $_)
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| 388 | {
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| 389 | $found = 1;
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| 390 | ## Reset at each merge to reduce chance of false matches.
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| 391 | @skipshas = ();
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| 392 | next;
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| 393 | }
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| 394 | if ($found && $_ =~ /^([[:xdigit:]]{7,}) [^ ]/)
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| 395 | {
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| 396 | push ( @skipshas, $1 );
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| 397 | }
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| 398 | }
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| 399 | }
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| 400 |
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| 401 | # Ignore commits that match the --ignore-matching pattern, if specified.
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| 402 | if (defined $ignore_matching && @line && $line[0] =~ /$ignore_matching/)
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| 403 | {
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| 404 | $skipflag = 1;
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| 405 | }
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| 406 | elsif ($skipflag)
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| 407 | {
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| 408 | ## Perhaps only warn if a pattern matches more than once?
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| 409 | warn "$ME: warning: skipping $sha due to $skipflag\n";
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| 410 | }
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| 411 |
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| 412 | if (! $skipflag)
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| 413 | {
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| 414 | if (defined $ignore_line && @line)
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| 415 | {
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| 416 | @line = grep ! /$ignore_line/, @line;
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| 417 | while ($line[$#line] =~ /^\s*$/) { pop @line; }
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| 418 | }
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| 419 |
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| 420 | # Record whether there are two or more paragraphs.
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| 421 | my $multi_paragraph = grep /^\s*$/, @line;
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| 422 |
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| 423 | # Format 'Co-authored-by: A U Thor <[email protected]>' lines in
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| 424 | # standard multi-author ChangeLog format.
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| 425 | for (@coauthors)
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| 426 | {
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| 427 | s/^Co-authored-by:\s*/\t /;
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| 428 | s/\s*</ </;
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| 429 |
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| 430 | /<.*?@.*\..*>/
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| 431 | or warn "$ME: warning: missing email address for "
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| 432 | . substr ($_, 5) . "\n";
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| 433 | }
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| 434 |
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| 435 | # If clustering of commit messages has been disabled, if this header
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| 436 | # would be different from the previous date/name/etc. header,
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| 437 | # or if this or the previous entry consists of two or more paragraphs,
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| 438 | # then print the header.
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| 439 | if ( ! $cluster
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| 440 | || $date_line ne $prev_date_line
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| 441 | || "@coauthors" ne "@prev_coauthors"
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| 442 | || $multi_paragraph
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| 443 | || $prev_multi_paragraph)
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| 444 | {
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| 445 | $prev_date_line eq ''
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| 446 | or print "\n";
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| 447 | print $date_line;
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| 448 | @coauthors
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| 449 | and print join ("\n", @coauthors), "\n";
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| 450 | }
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| 451 | $prev_date_line = $date_line;
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| 452 | @prev_coauthors = @coauthors;
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| 453 | $prev_multi_paragraph = $multi_paragraph;
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| 454 |
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| 455 | # If there were any lines
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| 456 | if (@line == 0)
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| 457 | {
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| 458 | warn "$ME: warning: empty commit message:\n"
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| 459 | . " commit $sha\n $date_line\n";
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| 460 | }
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| 461 | else
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| 462 | {
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| 463 | if ($append_dot)
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| 464 | {
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| 465 | # If the first line of the message has enough room, then
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| 466 | if (length $line[0] < 72)
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| 467 | {
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| 468 | # append a dot if there is no other punctuation or blank
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| 469 | # at the end.
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| 470 | $line[0] =~ /[[:punct:]\s]$/
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| 471 | or $line[0] .= '.';
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| 472 | }
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| 473 | }
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| 474 |
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| 475 | # Remove one additional leading TAB from each line.
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| 476 | $strip_tab
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| 477 | and map { s/^\t// } @line;
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| 478 |
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| 479 | # Prefix each non-empty line with a TAB.
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| 480 | @line = map { length $_ ? "\t$_" : '' } @line;
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| 481 |
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| 482 | print "\n", join ("\n", @line), "\n";
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| 483 | }
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| 484 | }
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| 485 |
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| 486 | defined ($in = <PIPE>)
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| 487 | or last;
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| 488 | $in ne "\n"
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| 489 | and die "$ME:$.: unexpected line:\n$in";
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| 490 | }
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| 491 |
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| 492 | close PIPE
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| 493 | or die "$ME: error closing pipe from " . quoted_cmd (@cmd) . "\n";
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| 494 | # FIXME-someday: include $PROCESS_STATUS in the diagnostic
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| 495 |
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| 496 | # Complain about any unused entry in the --amend=F specified file.
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| 497 | my $fail = 0;
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| 498 | foreach my $sha (keys %$amend_code)
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| 499 | {
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| 500 | warn "$ME:$amend_file: unused entry: $sha\n";
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| 501 | $fail = 1;
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| 502 | }
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| 503 |
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| 504 | exit $fail;
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| 505 | }
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| 506 |
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| 507 | # Local Variables:
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| 508 | # mode: perl
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| 509 | # indent-tabs-mode: nil
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| 510 | # eval: (add-hook 'before-save-hook 'time-stamp)
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| 511 | # time-stamp-line-limit: 50
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| 512 | # time-stamp-start: "my $VERSION = '"
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| 513 | # time-stamp-format: "%:y-%02m-%02d %02H:%02M"
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| 514 | # time-stamp-time-zone: "UTC0"
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| 515 | # time-stamp-end: "'; # UTC"
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| 516 | # End:
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|---|
