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#! /usr/bin/perl
# $Cambridge: exim/doc/doc-docbook/Tidytxt,v 1.6 2008/02/04 17:18:18 fanf2 Exp $
# Script to tidy up the output of w3m when it makes a text file. First we
# convert sequences of blank lines into a single blank line, to get everything
# uniform. Then we go through and insert blank lines before chapter and
# sections, also converting chapter titles to uppercase.
# We also have to do some character translation in the first pass. It seems
# that xmlto now generates Unicode in its HTML pages. This gives three problems:
# (1) It inserts the byte sequence C2 A0 (U+00A0) as a fixed-width space;
# (2) It uses U+25CF as its bullet character.
# (3) It inserts a whole slew of "box drawing" characters round the heading.
@lines = <>;
$lastwasblank = 0;
foreach $line (@lines)
{
# (1) non-break space -> normal space
$line =~ s/\x{c2}\x{a0}/ /g;
# (2) bullet -> asterisk
$line =~ s/\x{e2}\x{97}\x{8f}/*/g;
# (3a) horizontal box drawing -> hyphen
$line =~ s/\x{e2}\x{94}[\x{80}\x{81}\x{84}\x{85}\x{88}\x{89}]/-/g;
$line =~ s/\x{e2}\x{95}[\x{8c}\x{8d}\x{90}]/-/g;
$line =~ s/\x{e2}\x{95}[\x{b4}\x{b6}\x{b8}\x{ba}\x{bc}\x{be}]/-/g;
# (3b) vertical box drawing -> bar
$line =~ s/\x{e2}\x{94}[\x{82}\x{83}\x{86}\x{87}\x{8a}\x{8b}]/|/g;
$line =~ s/\x{e2}\x{95}[\x{8e}\x{8f}\x{91}]/|/g;
$line =~ s/\x{e2}\x{95}[\x{b5}\x{b7}\x{b9}\x{bb}\x{bd}\x{bf}]/|/g;
# (3c) corner box drawing -> plus
$line =~ s/\x{e2}\x{94}[\x{8c}-\x{bf}]/+/g;
$line =~ s/\x{e2}\x{95}[\x{80}-\x{8b}\x{92}-\x{b0}]/+/g;
# other
$line =~ s/\x{e2}\x{95}\x{b1}/\//g;
$line =~ s/\x{e2}\x{95}\x{b2}/\\/g;
$line =~ s/\x{e2}\x{95}\x{b3}/X/g;
# w3m rendering issue apparently only seen by pdp
# affects section numbers after the ToC, some info on spool-file -lines, etc
# always appears to be a spurious extra character, safely just dropped.
$line =~ s/\x{c2}//g;
if ($line =~ /^\s*$/)
{
$line = "" if $lastwasblank;
$lastwasblank = 1;
next;
}
$lastwasblank = 0;
}
# Find start of TOC, uppercasing its title
for ($i = 0; $i < scalar @lines; $i++)
{
$lines[$i] = "TABLE OF CONTENTS\n" if $lines[$i] =~ /^Table of Contents/;
last if $lines[$i] =~ /^1\. /;
}
# Find start of first chapter
for ($i++; $i < scalar @lines; $i++)
{ last if $lines[$i] =~ /^1\. /; }
# Process the body. We can detect the starts of chapters and sections by
# looking for preceding and following blank lines, and then matching against
# the numbers.
$chapter = 0;
for (; $i < scalar @lines; $i++)
{
next if $lines[$i-1] !~ /^$/ || $lines[$i+1] !~ /^$/;
# Start of chapter
if ($lines[$i] =~ /^(\d+)\. / && $1 == $chapter + 1)
{
$chapter++;
$section = 0;
$lines[$i] = "\n\n" . ("=" x 79) . "\n" . uc($lines[$i]);
}
# Start of next section
elsif ($lines[$i] =~ /^(\d+)\.(\d+) / && $1 == $chapter && $2 == $section + 1)
{
$section++;
$lines[$i] = "\n$lines[$i]" . "-" x (length($lines[$i]) - 1) . "\n";
}
}
print @lines;
# End
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