1 #!/usr/bin/perl -0777 -pi
2 # Update an FSF copyright year list to include the current year.
4 my $VERSION = '2009-08-03.23:03'; # UTC
6 # Copyright (C) 2009 Free Software Foundation
8 # This program is free software; you can redistribute it and/or modify
9 # it under the terms of the GNU General Public License as published by
10 # the Free Software Foundation; either version 3, or (at your option)
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
21 # Written by Jim Meyering
23 # The arguments to this script should be names of files that contain FSF
24 # copyright statements to be updated. For example, you may wish to
25 # place a target like the following in the top-level makefile in your
28 # .PHONY: update-copyright
30 # if test -d .git; then \
31 # git grep -l -w Copyright \
32 # | grep -v -E '(^|/)(COPYING|ChangeLog)' \
33 # | xargs $(srcdir)/build-aux/$@; \
36 # In the second grep, you can build a list of files to skip within your
39 # Iff an FSF copyright statement is discovered in a file and the final
40 # year is not the current year, the statement is updated for the new
41 # year and reformatted to fit within 72 columns. A warning is printed
42 # for every file for which no FSF copyright statement is discovered.
44 # Each file's FSF copyright statement must be formated correctly in
45 # order to be recognized, and it must appear before other text that
46 # looks like the start of a copyright statement. For example, each of
47 # these by itself is fine:
49 # Copyright (C) 1990-2005, 2007-2009 Free Software Foundation,
52 # # Copyright (c) 1990-2005, 2007-2009 Free Software
56 # * Copyright (C) 90,2005,2007-2009 Free Software
60 # However, the following format is not recognized because the line
61 # prefix changes after the first line:
63 # /* Copyright (C) 1990-2005, 2007-2009 Free Software
64 # * Foundation, Inc. */
66 # The following copyright statement is not recognized because the
67 # copyright holder is not the FSF:
69 # Copyright (C) 1990-2005, 2007-2009 Acme, Inc.
71 # Moreover, any FSF copyright statement following either of the previous
72 # copyright statements might not be recognized.
74 # The exact conditions that a file's FSF copyright statement must meet
75 # to be recognized are listed below. They may seem slightly complex,
76 # but you need not worry if some file in your project accidentally
77 # breaks one. The worst that can happen is that a file is not updated
78 # and a warning is issued.
80 # 1. The format is "Copyright (C)" (where "(C)" can be "(c)"), then a
81 # list of copyright years, and then the name of the copyright
82 # holder, which is "Free Software Foundation, Inc.".
83 # 2. "Copyright (C)" appears at the beginning of a line except that it
84 # may be prefixed by any sequence (e.g., a comment) of no more than
86 # 3. The prefix of "Copyright (C)" is the same as the prefix on the
87 # file's first occurrence of "Copyright (C)" that matches condition
88 # #2. Stated more simply, if something that looks like the start
89 # of a copyright statement appears earlier than the FSF copyright
90 # statement, the FSF copyright statement might not be recognized.
91 # This condition might be removed in the future.
92 # 4. Iff a prefix is present before "Copyright (C)", the same prefix
93 # appears at the beginning of each remaining line within the FSF
94 # copyright statement.
95 # 5. Blank lines, even if preceded by the prefix, do not appear
96 # within the FSF copyright statement.
97 # 6. Each copyright year is 2 or 4 digits, and years are separated by
98 # commas or dashes. Whitespace may occur after commas.
103 my $this_year = $ENV{UPDATE_COPYRIGHT_YEAR};
104 if (!$this_year || $this_year !~ m/^\d\d(\d\d)?$/) {
105 my ($sec, $min, $hour, $mday, $month, $year) = localtime (time());
106 $this_year = $year + 1900;
108 my $copyright = 'Copyright \([cC]\)';
109 my $holder = 'Free Software Foundation, Inc.';
114 # Unless the file consistently uses "\r\n" as the EOL, use "\n" instead.
115 my $eol = /(?:^|[^\r])\n/ ? "\n" : "\r\n";
121 if (/(^|\n)(.{0,$prefix_max})$copyright/)
125 $ws = '[ \t\r\f]'; # \s without \n
126 $ws = "(?:$ws*(?:$ws|\\n" . quotemeta($prefix) . ")$ws*)";
127 $holder =~ s/\s/$ws/g;
129 quotemeta("$leading$prefix") . "($copyright$ws"
130 . "(?:(?:\\d\\d)?\\d\\d(,$ws?|-))*"
131 . "((?:\\d\\d)?\\d\\d)$ws$holder)";
133 if (defined($old) && /$old/)
136 my $sep = $2 ? $2 : "";
139 # Handle two-digit year numbers like "98" and "99".
140 my $last_c_year = $last_year;
142 and $last_c_year += 1900;
144 if ($last_c_year != $this_year)
147 if ($sep eq '-' && $last_c_year + 1 == $this_year)
149 $new =~ s/$last_year/$this_year/;
151 elsif ($sep ne '-' && $last_c_year + 1 == $this_year)
153 $new =~ s/$last_year/$last_c_year-$this_year/;
157 $new =~ s/$last_year/$last_c_year, $this_year/;
160 # Normalize all whitespace including newline-prefix sequences.
163 # Put spaces after commas.
166 # Format within margin.
168 my $text_margin = $margin - length($prefix);
169 if ($prefix =~ /^(\t+)/) {
170 $text_margin -= length($1) * ($tab_width-1);
174 if (($new =~ s/^(.{1,$text_margin})(?: |$)//)
175 || ($new =~ s/^([\S]+)(?: |$)//))
178 $new_wrapped .= $new_wrapped ? $eol : $leading;
179 $new_wrapped .= "$prefix$line";
183 # Should be unreachable, but we don't want an infinite
184 # loop if it can be reached.
189 # Replace the old copyright statement.
190 s/$old/$new_wrapped/;
195 print STDERR "$ARGV: warning: FSF copyright statement not found\n";
199 # indent-tabs-mode: nil
200 # eval: (add-hook 'write-file-hooks 'time-stamp)
201 # time-stamp-start: "my $VERSION = '"
202 # time-stamp-format: "%:y-%02m-%02d.%02H:%02M"
203 # time-stamp-time-zone: "UTC"
204 # time-stamp-end: "'; # UTC"