#!/usr/bin/perl -w
use strict;
use diagnostics;

my ($filename, $subdir, $in_comment);
my $debug = 1;
my $dir = "./lkmpg-examples";
my $prog_start = '<programlisting><!\[CDATA\[';
my $prog_end   = '\]\]><\/programlisting>';


# If example source code directory doesn't exist, create it.
#
mkdir $dir if (! -d $dir);


# Loop on each sgml file
#
foreach $filename (`ls [0-9]*.sgml`)
{
	chomp $filename;
	$debug && print "Looking in $filename\n";
	open(FP, "<$filename") || die "Couldn't open $filename for reading.";

	while(<FP>)
	{
		# Don't extract code within comments.  Comments are there for a reason.
		$in_comment = 1 if (/<!--/);
		$in_comment = 0 if (/-->/);	

		if (/$prog_start/ and not $in_comment)
		{
			# Get the directory name from the filename
			#
			$subdir = join "", $filename =~ /(.*)\.sgml/;
			mkdir "$dir/$subdir" if (! -d "$dir/$subdir");

			# Get the name of the program
			$_ = <FP>;
			m/\/\*  (.*\.[ch]).*/;
			$debug && print "  found $+\n";

			open(srcFP, ">$dir/$subdir/$+") || die "Couldn't open $dir/$subdir/$+ for writing";
			print srcFP "$_";
			while (($_ = <FP>) !~ /$prog_end/) { print srcFP "$_"; }
		}
	}

}