lib-src/grep-changelog

   1 #! /usr/bin/perl
   2
   3 # Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004,
   4 #               2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
   5 #
   6 # This file is part of GNU Emacs.
   7
   8 # GNU Emacs 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 of the License, or
  11 # (at your option) any later version.
  12
  13 # GNU Emacs 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.
  17
  18 # You should have received a copy of the GNU General Public License
  19 # along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  20
  21
  22 # Extract entries from ChangeLogs matching specified criteria.
  23 # Optionally format the resulting output to a form suitable for RCS
  24 # logs, like they are used in Emacs, for example.  In this format,
  25 # author lines, leading spaces, and file names are removed.
  26
  27 require 5;
  28 use strict;
  29
  30 # Parse command line options.
  31
  32 use vars qw($author $regexp $exclude $from_date $to_date
  33             $rcs_log $with_date $version $help $reverse
  34             @entries);
  35
  36 use Getopt::Long;
  37
  38 my $result;
  39
  40 if (@ARGV == 0) {
  41
  42     # No arguments cannot possibly mean "show everything"!!
  43     $result = 0;
  44
  45 } else {
  46
  47     $result = GetOptions ("author=s" => \$author,
  48                           "text=s"  => \$regexp,
  49                           "exclude=s"  => \$exclude,
  50                           "from-date=s" => \$from_date,
  51                           "to-date=s" => \$to_date,
  52                           "rcs-log" => \$rcs_log,
  53                           "with-date" => \$with_date,
  54                           "reverse!" => \$reverse,
  55                           "version" => \$version,
  56                           "help"    => \$help);
  57
  58     # If date options are specified, check that they have the format
  59     # YYYY-MM-DD.
  60
  61     $result = 0 if $from_date && $from_date !~ /^\d\d\d\d-\d\d-\d\d$/;
  62     $result = 0 if $to_date && $to_date !~ /^\d\d\d\d-\d\d-\d\d$/;
  63 }
  64
  65 # Print usage information and exit when necessary.
  66
  67 if ($result == 0 || $help) {
  68     print <<USAGE;
  69
  70 Usage: $0 [options] [CHANGELOG...]
  71
  72 Print entries in ChangeLogs matching various criteria.
  73 Valid options are:
  74
  75   --author=AUTHOR         Match entries whose author line matches
  76                           regular expression AUTHOR
  77   --text=TEXT             Match entries whose text matches regular
  78                           expression TEXT
  79   --exclude=TEXT          Exclude entries matching TEXT
  80   --from-date=YYYY-MM-DD  Match entries not older than given date
  81   --to-date=YYYY-MM-DD    Match entries not younger than given date
  82   --rcs-log               Format output suitable for RCS log entries
  83   --with-date             Print short date line in RCS log
  84   --reverse               Show entries in reverse (chronological) order
  85   --version               Print version info
  86   --help                  Print this help
  87
  88 If no CHANGELOG is specified scan the files "ChangeLog" and
  89 "ChangeLog.N+" in the current directory.  Old-style dates in ChangeLogs
  90 are not recognized.
  91 USAGE
  92     exit !$help;
  93 }
  94
  95 # Print version info and exit if `--version' was specified.
  96
  97 if ($version) {
  98     print "0.3\n";
  99     exit 0;
 100 }
 101
 102
 103 # Value is non-zero if HEADER matches according to command line
 104 # options specified, i.e. it matches $author, and its date is in
 105 # the range $from_date <= date <= $to_date.
 106
 107 sub header_match_p {
 108     my $header = shift;
 109
 110     return 0 unless $header;
 111
 112     # No match if AUTHOR-regexp specified and doesn't match.
 113     return 0 if $author && $header !~ /$author/;
 114
 115     # Check that the date of the entry matches if date options
 116     # `--from-date' and/or `--to-date' were specified .  Old-style
 117     # dates in ChangeLogs are not recognized, and never match.
 118     if ($from_date || $to_date) {
 119         if ($header =~ /^(\d\d\d\d-\d\d-\d\d)/) {
 120             my $date = $1;
 121             return 0 if $from_date && $date lt $from_date;
 122             return 0 if $to_date && $date gt $to_date;
 123         } else {
 124             # Don't bother recognizing old-style dates.
 125             return 0;
 126         }
 127     }
 128
 129     return 1;
 130 }
 131
 132
 133 # Value is non-zero if ENTRY matches the criteria specified on the
 134 # command line, i.e. it matches $regexp, and it doesn't match
 135 # $exclude.
 136
 137 sub entry_match_p {
 138     my $entry = shift;
 139
 140     return 0 unless $entry;
 141
 142     if ($regexp) {
 143         return 1 if ($entry =~ /$regexp/
 144                      && (!$exclude || $entry !~ $exclude));
 145     } else {
 146         return 1 if !$exclude || $entry !~ $exclude;
 147     }
 148
 149     return 0;
 150 }
 151
 152
 153 # Print HEADER and/or ENTRY in a format suitable for what was
 154 # specified on the command line.  If $rcs_log is specified, author
 155 # lines are not printed, and leading spaces and file names are removed
 156 # from ChangeLog entries.
 157
 158 sub print_log {
 159     my ($header, $entry) = @_;
 160     my $output = '';
 161
 162     if ($rcs_log) {
 163         # Remove leading whitespace from entry.
 164         $entry =~ s/^\s+//mg;
 165         # Remove file name parts.
 166         $entry =~ s/^\*.*\(/(/mg;
 167         # Remove file name parts, 2.
 168         $entry =~ s/^\*.*://mg;
 169         if ($with_date) {
 170             $header =~ /(\d\d\d\d-\d\d-\d\d)/;
 171             $output = "!changelog-date $1\n";
 172         }
 173         $output .= $entry;
 174     } else {
 175         $output .= $header . $entry;
 176     }
 177
 178     if ($reverse) {
 179         push @entries, $output;
 180     } else {
 181         print $output;
 182     }
 183 }
 184
 185 # Scan LOG for matching entries, and print them to standard output.
 186
 187 sub parse_changelog {
 188     my $log = shift;
 189     my $entry = undef;
 190     my $header = undef;
 191
 192     @entries = () if $reverse;
 193
 194     # Open the ChangeLog.
 195     open (IN, "< $log") || die "Cannot open $log: $!";
 196
 197     while (defined(my $line = <IN>)) {
 198         if ($line =~ /^\S/) {
 199             # Line is an author-line.  Print previous entry if
 200             # it matches.
 201             print_log ($header, $entry)
 202                 if header_match_p ($header) && entry_match_p ($entry);
 203
 204             $entry = "";
 205             $header = $line;
 206
 207             # Add empty lines below the header.
 208             while (defined($line = <IN>) && $line =~ /^\s*$/) {
 209                 $header = "$header$line";
 210             }
 211         }
 212
 213         last unless defined $line;
 214
 215         if ($line =~ /^\s*\*/) {
 216             # LINE is the first line of a ChangeLog entry.  Print
 217             # previous entry if it matches.
 218             print_log ($header, $entry)
 219                 if header_match_p ($header) && entry_match_p ($entry);
 220             $entry = $line;
 221         } else {
 222             # Add LINE to the current entry.
 223             $entry = "$entry$line";
 224         }
 225     }
 226
 227     # Print last entry if it matches.
 228     print_log ($header, $entry)
 229         if header_match_p ($header) && entry_match_p ($entry);
 230
 231     close IN;
 232
 233     if ($reverse) {
 234         for (my $entry = @entries; $entry; $entry--) {
 235             print $entries[$entry-1];
 236         }
 237     }
 238 }
 239
 240
 241 # Main program.  Process ChangeLogs.
 242
 243 # If files were specified on the command line, parse those files in the
 244 # order supplied by the user; otherwise parse default files ChangeLog and
 245 # ChangeLog.NNN according to $reverse.
 246 unless (@ARGV > 0) {
 247     @ARGV = ("ChangeLog");
 248
 249     push @ARGV,
 250       map {"ChangeLog.$_"}
 251         sort {$b <=> $a}
 252           map {/\.(\d+)$/; $1}
 253             do {
 254                 opendir D, '.';
 255                 grep /^ChangeLog\.\d+$/, readdir D;
 256             };
 257
 258     @ARGV = reverse @ARGV if $reverse;
 259 }
 260
 261 while (defined (my $log = shift @ARGV)) {
 262     parse_changelog ($log) if -f $log;
 263 }
 264
 265
 266 # arch-tag: 9e4f6749-e053-4bb7-b3ad-11947318418e
 267 # grep-changelog ends here.