summaryrefslogtreecommitdiff
path: root/lib-src/b2m.pl
blob: 38eb96e076ff679d9ffac16615edfb52586f46b5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
#!/usr/bin/perl

# b2m.pl - Script to convert a Babyl file to an mbox file

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA.

# Maintained by Jonathan Kamens <jik@kamens.brookline.ma.us>.

# Requires CPAN modules: MailTools (for Mail::Address), TimeDate (for
# Date::Parse).

use warnings;
use strict;
use File::Basename;
use Getopt::Long;
use Mail::Address;
use Date::Parse;

my($whoami) = basename $0;
my($version) = '$Revision: 1.5 $';
my($usage) = "Usage: $whoami [--help] [--version] [--[no]full-headers] [Babyl-file]
\tBy default, full headers are printed.\n";

my($opt_help, $opt_version);
my($opt_full_headers) = 1;

die $usage if (! GetOptions(
			    'help' => \$opt_help,
			    'version' => \$opt_version,
			    'full-headers!' => \$opt_full_headers,
			    ));

if ($opt_help) {
    print $usage;
    exit;
}
elsif ($opt_version) {
    print "$whoami version: $version\n";
    exit;
}

die $usage if (@ARGV > 1);

$/ = "\n\037";

if (<> !~ /^BABYL OPTIONS:/) {
    die "$whoami: $ARGV is not a Babyl file\n$usage";
}

while (<>) {
    my($msg_num) = $. - 1;
    my($labels, $pruned, $full_header, $header);
    my($from_line, $from_addr);
    my($time);

    # This will strip the initial form feed, any whitespace that may
    # be following it, and then a newline
    s/^\s+//;
    # This will strip the ^_ off of the end of the message
    s/\037$//;

    if (! s/(.*)\n//) {
      malformatted:
	warn "$whoami: message $msg_num in $ARGV is malformatted\n";
	next;
    }
    $labels = $1;

    # Strip the integer indicating whether the header is pruned
    $labels =~ s/^(\d+)[,\s]*//;
    $pruned = $1;

    s/(?:((?:.+\n)+)\n*)?\*\*\* EOOH \*\*\*\n+// || goto malformatted;
    $full_header = $1;

    if (s/((?:.+\n)+)\n+//) {
	$header = $1;
    }
    else {
	# Message has no body
	$header = $_;
	$_ = '';
    }

    # "$pruned eq '0'" is different from "! $pruned".  We want to make
    # sure that we found a valid label line which explicitly indicated
    # that the header was not pruned.
    if ((! $full_header) || ($pruned eq '0')) {
	$full_header = $header;
    }

    # End message with two newlines (some mbox parsers require a blank
    # line before the next "From " line).
    s/\s+$/\n\n/;

    # Quote "^From "
    s/(^|\n)From /$1>From /g;

    # Strip extra commas and whitespace from the end
    $labels =~ s/[,\s]+$//;
    # Now collapse extra commas and whitespace in the remaining label string
    $labels =~ s/[,\s]+/, /g;

    foreach my $rmail_header qw(summary-line x-coding-system) {
	$full_header =~ s/(^|\n)$rmail_header:.*\n/$1/i;
    }

    if ($full_header =~ s/(^|\n)mail-from:\s*(From .*)\n/$1/i) {
	($from_line = $2) =~ s/\s*$/\n/;
    }
    else {
	foreach my $addr_header qw(return-path from really-from sender) {
	    if ($full_header =~ /(?:^|\n)$addr_header:\s*(.*\n(?:\B.*\n)*)/i) {
		my($addr) = Mail::Address->parse($1);
		$from_addr = $addr->address($addr);
		last;
	    }
	}

	if (! $from_addr) {
	    $from_addr = "Babyl_to_mail_by_$whoami\@localhost";
	}

	if ($full_header =~ /(?:^|\n)date:\s*(\S.*\S)/i) {
	    $time = str2time($1);
	}

	if (! $time) {
	    # No Date header or we failed to parse it
	    $time = time;
	}

	$from_line = "From " . $from_addr . " " . localtime($time) . "\n";
    }

    print($from_line, ($opt_full_headers ? $full_header : $header),
	  ($labels ? "X-Babyl-Labels: $labels\n" : ""), "\n",
	  $_) || die "$whoami: error writing to stdout: $!\n";
}

close(STDOUT) || die "$whoami: Error closing stdout: $!\n";

# arch-tag: 8c7c8ab0-721c-46d7-ba3e-139801240aa8