#!/usr/bin/perl
BEGIN { push @INC, '../lib' } # If you haven't installed perl yet.
use Pod::Functions;
local $/ = '';
$level = 0;
$cur = '';
while (<>) {
    next unless /^=(?!cut)/ .. /^=cut/;
    ++$level if /^=over/;
    --$level if /^=back/;
    # Ignore items that are nested within other items, e.g. don't split on the
    # items nested within the pack() and sprintf() items in perlfunc.pod.
    if (/=item (\S+)/ and $level == 1) {
        my $item = $1;
        s/=item //; 
        $next{$cur} = $item;
        $cur = $item;
        $syn{$cur} .= $_;
        next;
    } else { 
        s,L</,L<perlfunc/,g;
        push @{$pod{$cur}}, $_ if $cur;
    }
} 
for $f ( keys %syn ) {
    next unless $Type{$f};
    $flavor = $Flavor{$f};
    $orig = $f;
    ($name = $f) =~ s/\W//g;
    # deal with several functions sharing a description
    $func = $orig;
    $func = $next{$func} until $pod{$func};
    my $body = join "", @{$pod{$func}};
    # deal with unbalanced =over and =back cause by the split
    my $has_over = $body =~ /^=over/;
    my $has_back = $body =~ /^=back/;
    $body =~ s/^=over\s*//m if $has_over and !$has_back;
    $body =~ s/^=back\s*//m if $has_back and !$has_over;
    open (POD, '>', "$name.pod") || die "can't open $name.pod: $!";
    print POD <<EOF;
\=head1 NAME
$orig - $flavor
\=head1 SYNOPSIS
$syn{$orig}
\=head1 DESCRIPTION
$body
EOF
    close POD;
}