lib-src/b2m.pl

   1 #!/usr/bin/perl
   2
   3 # b2m.pl - Script to convert a Babyl file to an mbox file
   4
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 2 of the License, or
   8 # (at your option) any later version.
   9
  10 # This program is distributed in the hope that it will be useful, but
  11 # WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 # General Public License for more details.
  14
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program; if not, write to the Free Software
  17 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18 # USA.
  19
  20 # Maintained by Jonathan Kamens <jik@kamens.brookline.ma.us>.
  21
  22 # Requires CPAN modules: MailTools (for Mail::Address), TimeDate (for
  23 # Date::Parse).
  24
  25 use warnings;
  26 use strict;
  27 use File::Basename;
  28 use Getopt::Long;
  29 use Mail::Address;
  30 use Date::Parse;
  31
  32 my($whoami) = basename $0;
  33 my($version) = '$Revision: 1.4 $';
  34 my($usage) = "Usage: $whoami [--help] [--version] [--[no]full-headers] [Babyl-file]
  35 \tBy default, full headers are printed.\n";
  36
  37 my($opt_help, $opt_version);
  38 my($opt_full_headers) = 1;
  39
  40 die $usage if (! GetOptions(
  41                             'help' => \$opt_help,
  42                             'version' => \$opt_version,
  43                             'full-headers!' => \$opt_full_headers,
  44                             ));
  45
  46 if ($opt_help) {
  47     print $usage;
  48     exit;
  49 }
  50 elsif ($opt_version) {
  51     print "$whoami version: $version\n";
  52     exit;
  53 }
  54
  55 die $usage if (@ARGV > 1);
  56
  57 $/ = "\n\037";
  58
  59 if (<> !~ /^BABYL OPTIONS:/) {
  60     die "$whoami: $ARGV is not a Babyl file\n$usage";
  61 }
  62
  63 while (<>) {
  64     my($msg_num) = $. - 1;
  65     my($labels, $pruned, $full_header, $header);
  66     my($from_line, $from_addr);
  67     my($time);
  68
  69     # This will strip the initial form feed, any whitespace that may
  70     # be following it, and then a newline
  71     s/^\s+//;
  72     # This will strip the ^_ off of the end of the message
  73     s/\037$//;
  74
  75     if (! s/(.*)\n//) {
  76       malformatted:
  77         warn "$whoami: message $msg_num in $ARGV is malformatted\n";
  78         next;
  79     }
  80     $labels = $1;
  81
  82     # Strip the integer indicating whether the header is pruned
  83     $labels =~ s/^(\d+)[,\s]*//;
  84     $pruned = $1;
  85
  86     s/(?:((?:.+\n)+)\n*)?\*\*\* EOOH \*\*\*\n+// || goto malformatted;
  87     $full_header = $1;
  88
  89     if (s/((?:.+\n)+)\n+//) {
  90         $header = $1;
  91     }
  92     else {
  93         # Message has no body
  94         $header = $_;
  95         $_ = '';
  96     }
  97
  98     # "$pruned eq '0'" is different from "! $pruned".  We want to make
  99     # sure that we found a valid label line which explicitly indicated
 100     # that the header was not pruned.
 101     if ((! $full_header) || ($pruned eq '0')) {
 102         $full_header = $header;
 103     }
 104
 105     # End message with two newlines (some mbox parsers require a blank
 106     # line before the next "From " line).
 107     s/\s+$/\n\n/;
 108
 109     # Quote "^From "
 110     s/(^|\n)From /$1>From /g;
 111
 112     # Strip extra commas and whitespace from the end
 113     $labels =~ s/[,\s]+$//;
 114     # Now collapse extra commas and whitespace in the remaining label string
 115     $labels =~ s/[,\s]+/, /g;
 116
 117     foreach my $rmail_header qw(summary-line x-coding-system) {
 118         $full_header =~ s/(^|\n)$rmail_header:.*\n/$1/i;
 119     }
 120
 121     if ($full_header =~ s/(^|\n)mail-from:\s*(From .*)\n/$1/i) {
 122         ($from_line = $2) =~ s/\s*$/\n/;
 123     }
 124     else {
 125         foreach my $addr_header qw(return-path from really-from sender) {
 126             if ($full_header =~ /(?:^|\n)$addr_header:\s*(.*\n(?:\B.*\n)*)/i) {
 127                 my($addr) = Mail::Address->parse($1);
 128                 $from_addr = $addr->address($addr);
 129                 last;
 130             }
 131         }
 132
 133         if (! $from_addr) {
 134             $from_addr = "Babyl_to_mail_by_$whoami\@localhost";
 135         }
 136
 137         if ($full_header =~ /(?:^|\n)date:\s*(\S.*\S)/i) {
 138             $time = str2time($1);
 139         }
 140
 141         if (! $time) {
 142             # No Date header or we failed to parse it
 143             $time = time;
 144         }
 145
 146         $from_line = "From " . $from_addr . " " . localtime($time) . "\n";
 147     }
 148
 149     print($from_line, ($opt_full_headers ? $full_header : $header),
 150           ($labels ? "X-Babyl-Labels: $labels\n" : ""), "\n",
 151           $_) || die "$whoami: error writing to stdout: $!\n";
 152 }
 153
 154 close(STDOUT) || die "$whoami: Error closing stdout: $!\n";