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#!/usr/bin/env perl
use strict;
use warnings;
my $infile = $ARGV[0] or die "Usage: $0 infile";
my $line;
my $fh;
## Count prefix a specific character in the start of a string
## to know where in a list we are.
sub count_char {
my ($ch, $line) = @_;
my $i = 1;
while (substr($line, $i, 1) eq "$ch") {
$i += 1;
}
return $i;
}
## Generate a sequence of spaces for use in front of tables.
sub spaces {
my $count = shift;
my $spaces = "";
while ($count > 0) {
$spaces .= " ";
$count -= 1;
}
return $spaces;
}
## Handle unordered lists.
sub u_list {
my $line = shift;
return 0 unless (substr($line, 0, 1) eq '*');
my $len = count_char('*', $line);
print spaces($len) . "*" . substr($line, $len) . "\n";
return 1;
}
## Handle ordered lists.
sub o_list {
my $line = shift;
return 0 unless (substr($line, 0, 1) eq '#');
my $len = count_char('#', $line);
print spaces($len) . "1." . substr($line, $len) . "\n";
return 1;
}
## A very primitive approach to table conversion,
## but it should work for pandoc output.
sub we_can_has_tables {
print "||";
while (($line = <$fh>)) {
chomp $line;
if (substr($line, 0, 2) eq '|-') {
print "||\n";
} elsif (substr($line, 0, 2) eq '|}') {
print "||\n";
return;
} elsif (substr($line, 0, 1) eq '!') {
print "||" . substr($line, 1);
} elsif (substr($line, 0, 1) eq '|') {
print "||" . substr($line, 1);
} else {
print $line;
}
}
}
open $fh, "<", "$infile" or die $!;
while (($line = <$fh>)) {
chomp $line;
next if (u_list $line); # Unordered list
next if (o_list $line); # Ordered list
if (substr($line, 0, 2) eq '{|') {
we_can_has_tables $line;
next;
}
print $line . "\n";
}
close $fh;
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