ls2mail

#!/usr/local/bin/perl
#
# ls2mail -- converts listserv formated digests to UNIX "mail" format
#
# Usage:
# ./ls2mail < infile > outfile
# cat infile | ./ls2mail > outfile
#
# Written by David Kilzer <ddkilzer@ti.com>
# Tue, Mar 24, 1998
#
# Below please find a Perl script I helped to write for archiving the
# ADV-HTML mailing list with Hypermail. I originally wrote the script for
# Patrick Douglas Crispen <crispen@netsquirrel.com>, but he said it would
# be okay to include the script with Hypermail (if so desired).
#
# This script appears to function similarly to the n2folder Perl script
# that Peter Murray <pem@po.cwru.edu> recently sent, and they may even
# operate on the same type of listserv archive.
#
# One thing unique feature that ls2mail may have is that it generates a
# "Message-ID" for each message when converting the listserv archive to an
# mbox archive. While this won't help when linking message threads, it
# did help Hypermail (possibly required by the old 1.x versions?) to
# create its output.

use strict;


my$first_time = 1; # marks first time through script
my$line; # stores one input line
my$header; # stores mail message header lines
my$from_address; # stores "From:" address
my@date; # stores "Date:" information
my$message_id; # stores new message ID info


while ($line = <>) # use '<>' operator so we act like a UNIX filter
{
chomp ($line); # remove extra newlines

if ($line !~ m/^={73}$/) # Separator line?
 {
print$line, "\n"; # Not separator, just print
 }
else# Found separator line, process
 {
$header = ""; # clear variable
$from_address = ""; # clear variable
@date = (); # clear variable
$message_id = ""; # clear variable

# Read in email header lines

while ($line = <>)
 {
lastif ($line =~ m/^\s*$/); # message header ends with "blank" line
$header .= $line; # add $line to $header
 }

$header =~ s/^Sender:\s/To: /mi; # change "Sender:" to "To:"

$header =~ s/^([^\s:]+:)\s+/$1/mg; # remove extra space from all lines

$header =~ s/\n\s+/\n/mg; # continued lines used 8 spaces

# Find "From" address to use
if ($header =~ m/^Reply-To:\s.*<([^>]+)>/mi)
 {
$from_address = $1;
 }
elsif ($header =~ m/^Reply-To:\s.*\n\s.*<([^>]+)>/mi)
 {
$from_address = $1;
 }

$header =~ m/^Date:\s(.*)$/mi; # find "Date" header
@date = split ('', $1); # split date into an array
$date[0] =~ tr/,//d; # remove commas from first date element
$date[1] = "" . $date[1] if (length($date[1]) == 1);
# add space to single days

$message_id = uc (join ('.', @date, $from_address)); # create message ID
$message_id =~ tr/[A-Z][0-9].@//cd; # remove bad characters

# Print new UNIX mail header
print"\n"if (! $first_time);
$first_time &&= 0;
print"From $from_address$date[0] $date[2] $date[1] $date[4]
$date[3]\n";
print"Message-Id: <$message_id>\n";
print$header, "\n";
 }
}


exit 0;