doc/doc-docbook/Tidytxt

   1 #! /usr/bin/perl
   2
   3 # Script to tidy up the output of w3m when it makes a text file. First we
   4 # convert sequences of blank lines into a single blank line, to get everything
   5 # uniform. Then we go through and insert blank lines before chapter and
   6 # sections, also converting chapter titles to uppercase.
   7
   8 # We also have to do some character translation in the first pass. It seems
   9 # that xmlto now generates Unicode in its HTML pages. This gives three problems:
  10 # (1) It inserts the byte sequence C2 A0 (U+00A0) as a fixed-width space;
  11 # (2) It uses U+25CF as its bullet character.
  12 # (3) It inserts a whole slew of "box drawing" characters round the heading.
  13
  14 @lines = <>;
  15
  16 $lastwasblank = 0;
  17 foreach $line (@lines)
  18   {
  19   # (1) non-break space -> normal space
  20   $line =~ s/\x{c2}\x{a0}/ /g;
  21   # (2) bullet -> asterisk
  22   $line =~ s/\x{e2}\x{97}\x{8f}/*/g;
  23   # (3a) horizontal box drawing -> hyphen
  24   $line =~ s/\x{e2}\x{94}[\x{80}\x{81}\x{84}\x{85}\x{88}\x{89}]/-/g;
  25   $line =~ s/\x{e2}\x{95}[\x{8c}\x{8d}\x{90}]/-/g;
  26   $line =~ s/\x{e2}\x{95}[\x{b4}\x{b6}\x{b8}\x{ba}\x{bc}\x{be}]/-/g;
  27   # (3b) vertical box drawing -> bar
  28   $line =~ s/\x{e2}\x{94}[\x{82}\x{83}\x{86}\x{87}\x{8a}\x{8b}]/|/g;
  29   $line =~ s/\x{e2}\x{95}[\x{8e}\x{8f}\x{91}]/|/g;
  30   $line =~ s/\x{e2}\x{95}[\x{b5}\x{b7}\x{b9}\x{bb}\x{bd}\x{bf}]/|/g;
  31   # (3c) corner box drawing -> plus
  32   $line =~ s/\x{e2}\x{94}[\x{8c}-\x{bf}]/+/g;
  33   $line =~ s/\x{e2}\x{95}[\x{80}-\x{8b}\x{92}-\x{b0}]/+/g;
  34   # other
  35   $line =~ s/\x{e2}\x{95}\x{b1}/\//g;
  36   $line =~ s/\x{e2}\x{95}\x{b2}/\\/g;
  37   $line =~ s/\x{e2}\x{95}\x{b3}/X/g;
  38
  39   # w3m rendering issue apparently only seen by pdp
  40   # affects section numbers after the ToC, some info on spool-file -lines, etc
  41   # always appears to be a spurious extra character, safely just dropped.
  42   $line =~ s/\x{c2}//g;
  43
  44   if ($line =~ /^\s*$/)
  45     {
  46     $line = "" if $lastwasblank;
  47     $lastwasblank = 1;
  48     next;
  49     }
  50   $lastwasblank = 0;
  51   }
  52
  53 # Find start of TOC, uppercasing its title
  54
  55 for ($i = 0; $i < scalar @lines; $i++)
  56   {
  57   $lines[$i] = "TABLE OF CONTENTS\n" if $lines[$i] =~ /^Table of Contents/;
  58   last if $lines[$i] =~ /^1\. /;
  59   }
  60
  61 # Find start of first chapter
  62
  63 for ($i++; $i < scalar @lines; $i++)
  64   { last if $lines[$i] =~ /^1\. /; }
  65
  66 # Process the body. We can detect the starts of chapters and sections by
  67 # looking for preceding and following blank lines, and then matching against
  68 # the numbers.
  69
  70 $chapter = 0;
  71 for (; $i < scalar @lines; $i++)
  72   {
  73   next if $lines[$i-1] !~ /^$/ || $lines[$i+1] !~ /^$/;
  74
  75   # Start of chapter
  76
  77   if ($lines[$i] =~ /^(\d+)\. / && $1 == $chapter + 1)
  78     {
  79     $chapter++;
  80     $section = 0;
  81     $lines[$i] = "\n\n" . ("=" x 79) . "\n" . uc($lines[$i]);
  82     }
  83
  84   # Start of next section
  85
  86   elsif ($lines[$i] =~ /^(\d+)\.(\d+) / && $1 == $chapter && $2 == $section + 1)
  87     {
  88     $section++;
  89     $lines[$i] = "\n$lines[$i]" . "-" x (length($lines[$i]) - 1) . "\n";
  90     }
  91   }
  92
  93 print @lines;
  94
  95 # End