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I'm trying to learn Go and one wounderful online resource I found is wiki. Particularly I found beginner exercises section to be very interesting to me. I wanted to print these excercises including solutions so I will be able to try to solve them offline. So I wrote this script which downloads all exercies and solutions, extracts all content removing headers, footers and navigation bars and puts it in one big HTML page to be printed.
#!/usr/bin/perl # Downloads all beginner exercises and solutions from # wiki (see; extracts wiki # topic content and puts it in one big HTML page to make it easy to # print all of them as one document # # Usage: > output.html # use strict; use warnings; use LWP::Simple; use URI; use XML::LibXML; my $PARSER = XML::LibXML->new(); my $output = create_output_node(); while (my $topic = next_topic()) { my $url = '' . $topic; print STDERR $topic, "\n\n"; my @topic_nodes = extract_wiki_topic_content($url); links_rel_to_abs($_, $url) for @topic_nodes; add_wiki_topic_to_node($output, $topic, @topic_nodes); } print $output->ownerDocument->toString; { my $i = 0; my $show_solution = 0; sub next_topic { $i ++; if($i > 149) { return undef if $show_solution; $i = 0; $show_solution = 1; return next_topic(); } my $topic = "BeginnerExercise$i"; $topic .= 'Solution' if $show_solution; return $topic; } } sub create_output_node { my $dom = XML::LibXML::Document->new(); my $root = XML::LibXML::Element->new('html'); $dom->setDocumentElement($root); my $title_text = 'Beginner Exercises and Solutions ( +t)'; my $title = XML::LibXML::Element->new('title'); $title->appendText($title_text); $root->appendChild($title); my $body = XML::LibXML::Element->new('body'); $root->appendChild($body); my $h1 = XML::LibXML::Element->new('h1'); $h1->appendText($title_text); $body->appendChild($h1); return $body; } sub extract_wiki_topic_content { my $url = shift; my $dom = $PARSER->parse_html_string(get($url)); return $dom->findnodes(<<'XPATH'); //td[@valign="top" and @rowspan = 2] /*[count(preceding-sibling::hr[@noshade]) > 0 and count(following-sibling::hr[@noshade]) > 0] XPATH } sub links_rel_to_abs { my $node = shift; my $base_url = shift; for my $link ($node->findnodes('.//@href'), $node->findnodes('.//@ +src')) { $link->setValue(URI->new_abs($link->value, $base_url)); } } sub add_wiki_topic_to_node { my $node = shift; my $title = shift; my @topic_nodes = @_; my $h2 = XML::LibXML::Element->new('h2'); $h2->appendText($title); $node->appendChild($h2); $node->appendChild($_) for @topic_nodes; }

Ilya Martynov,
Quality Perl Programming and Unix Support UK managed @ offshore prices -
Personal website -

In reply to Combine LWP::Simple with XML::LibXML to download Go exercises by IlyaM

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