1 #!/usr/bin/perl -0777 -pi
2 # Update an FSF copyright year list to include the current year.
4 my $VERSION = '2009-08-04.07:25'; # 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 and Joel E. Denny
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 @copyright{} 1990-2005, 2007-2009 Free Software
52 # # Copyright (C) 1990-2005, 2007-2009 Free Software
56 # * Copyright © 90,2005,2007-2009
57 # * Free Software Foundation, Inc.
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 also be "(c)",
81 # "@copyright{}", or "©"), then a list of copyright years, and
82 # then the name of the copyright holder, which is "Free Software
84 # 2. "Copyright (C)" appears at the beginning of a line except that it
85 # may be prefixed by any sequence (e.g., a comment) of no more than
87 # 3. The prefix of "Copyright (C)" is the same as the prefix on the
88 # file's first occurrence of "Copyright (C)" that matches condition
89 # #2. Stated more simply, if something that looks like the start
90 # of a copyright statement appears earlier than the FSF copyright
91 # statement, the FSF copyright statement might not be recognized.
92 # This condition might be removed in the future.
93 # 4. Iff a prefix is present before "Copyright (C)", the same prefix
94 # appears at the beginning of each remaining line within the FSF
95 # copyright statement.
96 # 5. Blank lines, even if preceded by the prefix, do not appear
97 # within the FSF copyright statement.
98 # 6. Each copyright year is 2 or 4 digits, and years are separated by
99 # commas or dashes. Whitespace may occur after commas.
104 my $copyright_re = 'Copyright (?:\([cC]\)|@copyright{}|©)';
105 my $holder = 'Free Software Foundation, Inc.';
110 my $this_year = $ENV{UPDATE_COPYRIGHT_YEAR};
111 if (!$this_year || $this_year !~ m/^\d{4}$/)
113 my ($sec, $min, $hour, $mday, $month, $year) = localtime (time ());
114 $this_year = $year + 1900;
117 # Unless the file consistently uses "\r\n" as the EOL, use "\n" instead.
118 my $eol = /(?:^|[^\r])\n/ ? "\n" : "\r\n";
124 if (/(^|\n)(.{0,$prefix_max})$copyright_re/)
128 $ws_re = '[ \t\r\f]'; # \s without \n
130 "(?:$ws_re*(?:$ws_re|\\n" . quotemeta($prefix) . ")$ws_re*)";
131 my $holder_re = $holder;
132 $holder_re =~ s/\s/$ws_re/g;
134 quotemeta("$leading$prefix") . "($copyright_re$ws_re"
135 . "(?:(?:\\d\\d)?\\d\\d(,$ws_re?|-))*"
136 . "((?:\\d\\d)?\\d\\d)$ws_re$holder_re)";
138 if (defined $stmt_re && /$stmt_re/)
141 my $sep = $2 ? $2 : "";
142 my $final_year_orig = $3;
144 # Handle two-digit year numbers like "98" and "99".
145 my $final_year = $final_year_orig;
147 and $final_year += 1900;
149 if ($final_year != $this_year)
152 if ($sep eq '-' && $final_year + 1 == $this_year)
154 $stmt =~ s/$final_year_orig/$this_year/;
156 elsif ($sep ne '-' && $final_year + 1 == $this_year)
158 $stmt =~ s/$final_year_orig/$final_year-$this_year/;
162 $stmt =~ s/$final_year_orig/$final_year, $this_year/;
165 # Normalize all whitespace including newline-prefix sequences.
166 $stmt =~ s/$ws_re/ /g;
168 # Put spaces after commas.
171 # Format within margin.
173 my $text_margin = $margin - length($prefix);
174 if ($prefix =~ /^(\t+)/)
176 $text_margin -= length($1) * ($tab_width - 1);
180 if (($stmt =~ s/^(.{1,$text_margin})(?: |$)//)
181 || ($stmt =~ s/^([\S]+)(?: |$)//))
184 $stmt_wrapped .= $stmt_wrapped ? $eol : $leading;
185 $stmt_wrapped .= "$prefix$line";
189 # Should be unreachable, but we don't want an infinite
190 # loop if it can be reached.
195 # Replace the old copyright statement.
196 s/$stmt_re/$stmt_wrapped/;
201 print STDERR "$ARGV: warning: FSF copyright statement not found\n";
205 # indent-tabs-mode: nil
206 # eval: (add-hook 'write-file-hooks 'time-stamp)
207 # time-stamp-start: "my $VERSION = '"
208 # time-stamp-format: "%:y-%02m-%02d.%02H:%02M"
209 # time-stamp-time-zone: "UTC"
210 # time-stamp-end: "'; # UTC"