doc/doc-scripts/f2txt

   1 #!/usr/bin/perl
   2
   3 # Script to turn the Exim FAQ into plain ASCII.
   4
   5 use integer;
   6
   7
   8 # Function to do text conversions to display paragraphs
   9
  10 sub process_display {
  11 my($s) = $_[0];
  12 $s =~ s/^==>/   /;
  13 return $s;
  14 }
  15
  16
  17 # Function to do text conversions to paragraphs not in displays.
  18
  19 sub process_non_display {
  20 my($s) = $_[0];
  21
  22 $s =~ s/@\\/@@backslash@@/g;                 # @\ temporarily hidden
  23
  24 $s =~ s/\\#/ /g;                             # \# is a hard space
  25
  26 $s =~ s/\\\*\*([^*]*)\*\*\\/$1/g;            # \**...**\   => text
  27 $s =~ s/\\\*([^*]*)\*\\/"$1"/g;              # \*.....*\   => "text"
  28 $s =~ s/\\"([^"]*)"\\/"$1"/g;                # \"....."\   => "text"
  29 $s =~ s/\\\$([^\$]*)\$\\/\$$1/g;             # \$.....$\   => $text
  30 $s =~ s/\\\\([^\\]*)\\\\/$1/g;               # \\.....\\   => text
  31 $s =~ s/\\\(([^)]*)\)\\/$1/g;                # \(.....)\   => text
  32 $s =~ s/\\-([^-]*)-\\/-$1/g;                 # \-.....-\   => -text
  33 $s =~ s/\\\[([^]]*)\]\\/<$1>/gx;             # \[.....]\   => <text>
  34 $s =~ s/\\\?(.*?)\?\\/$1/g;                  # \?.....?\   => text
  35 $s =~ s/\\\^\^([^^]*)\^\^\\/$1/g;            # \^^...^^\   => text
  36 $s =~ s/\\\^([^^]*)\^\\/$1/g;                # \^.....^\   => text
  37 $s =~ s/\\%([^%]*)%\\/"$1"/g;                # \%.....%\   => "text"
  38 $s =~ s/\\\/([^\/]*)\/\\/$1/g;               # \/...../\   => text
  39 $s =~ s/\\([^\\]+)\\/"$1"/g;                 # \.......\   => "text"
  40
  41 $s =~ s"//([^/\"]*)//"$1"g;                  # //.....//   => text
  42 $s =~ s/::([^:]*)::/$1:/g;                   # ::.....::   => text:
  43
  44 $s =~ s/``(.*?)''/"$1"/g;                    # ``.....''   => "text"
  45
  46 $s =~ s/\s*\[\[br\]\]\s*\n/\n/g;             # Remove [[br]]
  47
  48 $s =~ s/@@backslash@@/\\/g;                  # Put back single backslash
  49
  50 return $s;
  51 }
  52
  53
  54 # Main program
  55
  56 # We want to read the file paragraph by paragraph; Perl only does this if the
  57 # separating lines are truly blank. Having been caught by lines containing
  58 # whitespace before, do a de-trailing pass first.
  59
  60 open(IN, "$ARGV[0]") || die "can't open $ARGV[0] (preliminary)\n";
  61 open(OUT, ">$ARGV[0]-$$") || die "can't open $ARGV[0]-$$\n";
  62 while (<IN>)
  63   {
  64   s/[ \t]+$//;
  65   print OUT;
  66   }
  67 close(IN);
  68 close(OUT);
  69 rename("$ARGV[0]-$$", "$ARGV[0]") ||
  70   die "can't rename $ARGV[0]-$$ as $ARGV[0]\n";
  71
  72 # The second argument is the name of the output file.
  73
  74 open(IN, "$ARGV[0]") || die "can't open $ARGV[0] (for real)\n";
  75 open(OUT, ">$ARGV[1]") || die "can't open $ARGV[1]\n";
  76
  77 $/ = "";
  78
  79 while ($_ = <IN>)
  80   {
  81   # Comment lines start with ##
  82
  83   next if /^\#\#/;
  84
  85   # If a paragraph begins ==> it is a display which must remain verbatim
  86   # and not be reformatted. The flag gets turned into spaces.
  87
  88   if ($_ =~ /^==>/)
  89     {
  90     $_ = &process_display($_);
  91     }
  92
  93   # Non-display paragraph
  94
  95   else
  96     {
  97     $_ = &process_non_display($_);
  98     }
  99
 100   print OUT;
 101   }
 102
 103 close(IN);
 104 close(OUT);
 105
 106 End