ikiwiki-prefix-directives

   1 #!/usr/bin/perl -i
   2 use warnings;
   3 use strict;
   4
   5 undef $/; # process whole files at once
   6
   7 my $regex = qr{
   8         (\\?)           # 1: escape?
   9         \[\[(!?)        # directive open; 2: optional prefix
  10         ([-\w]+)        # 3: command
  11         (               # 4: the parameters (including initial whitespace)
  12         \s+
  13                 (?:
  14                         (?:[-\w]+=)?            # named parameter key?
  15                         (?:
  16                                 """.*?"""       # triple-quoted value
  17                                 |
  18                                 "[^"]+"         # single-quoted value
  19                                 |
  20                                 [^\s\]]+        # unquoted value
  21                         )
  22                         \s*                     # whitespace or end
  23                                                 # of directive
  24                 )
  25         *)              # 0 or more parameters
  26         \]\]            # directive closed
  27 }sx;
  28
  29 sub handle_directive {
  30         my $escape = shift;
  31         my $prefix = shift;
  32         my $directive = shift;
  33         my $args = shift;
  34
  35         if (length $escape) {
  36                 return "${escape}[[${prefix}${directive}${args}]]"
  37         }
  38         if ($directive =~ m/^(if|more|table|template|toggleable)$/) {
  39                 $args =~ s{$regex}{handle_directive($1, $2, $3, $4)}eg;
  40         }
  41         return "[[!${directive}${args}]]"
  42 }
  43
  44 while (<>) {
  45         s{$regex}{handle_directive($1, $2, $3, $4)}eg;
  46         print;
  47 }