From 31b078cf8ff0fe7156332fa6cef033a351f805f4 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Tue, 05 Jun 2012 21:12:29 -0400
Subject: Add test script that numbers section headers.

---
diff --git a/notes/number-sections.pl b/notes/number-sections.pl
new file mode 100755
index 0000000..3cef327
--- /dev/null
+++ b/notes/number-sections.pl
@@ -0,0 +1,73 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+use HTML::TreeBuilder;
+
+sub find_elements_by_tag_names($@)
+{
+	my ($elem, @tagnames) = @_;
+	if (ref($elem) ne 'HTML::TreeBuilder' && ref($elem) ne 'HTML::Element') {
+		die('Invalid argument to find_elements_by_tag_names');
+	}
+
+	my @list = $elem->content_list();
+	my $tag;
+	my @retlist = ();
+
+	foreach (@list) {
+		if (ref($_) ne 'HTML::Element') {
+			next;
+		}
+		$tag = $_->tag();
+		if (grep($_ eq $tag, @tagnames)) {
+			push(@retlist, $_);
+		}
+	}
+
+	return @retlist;
+}
+
+sub number_sections($)
+{
+	my ($doc) = @_;
+#	my $doc = shift;
+	if (ref($doc) ne 'HTML::TreeBuilder') {
+		die('Invalid argument to number_sections');
+	}
+
+	my @body = find_elements_by_tag_names($doc, ('body'));
+	my @headers = find_elements_by_tag_names($body[0],
+		('h1', 'h2', 'h3', 'h4', 'h5', 'h6'));
+	my @secnums = (0, 0, 0, 0, 0, 0);
+	my $curlev = -1;
+	my $newlev;
+	my $secstr;
+
+	foreach (@headers) {
+		$newlev = $_->tag();
+		$newlev =~ s/^h(\d)$/$1/;
+		if ($newlev != $curlev) {
+			foreach (@secnums[$newlev .. $#secnums]) {
+				$_ = 0;
+			}
+		}
+		++$secnums[$newlev - 1];
+		$secstr = join('.', @secnums);
+		$secstr =~ s/(\.0)*$//;
+		print($secstr, ":\t\"", $_->content_list(), "\"\n");
+		$curlev = $newlev;
+	}
+}
+
+sub main()
+{
+	my $doc = HTML::TreeBuilder->new();
+	while (<>) {
+		$doc->parse($_);
+	}
+	number_sections($doc);
+}
+
+main();
--
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