Last Change: 2018-09-07, 16:50
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Perl::Critic::Policy::Documentation::RequireLinkedURLs - use L<> markup on URLs in POD
This policy is part of the "Perl::Critic::Pulp" add-on. It asks you to put "L<>" markup on URLs in POD text in Perl 5.8 and higher.
use 5.008;
=head1 HOME PAGE
http://foo.org/mystuff/index.html # bad
L<http://foo.org/mystuff/index.html> # good
"L<>" markup gives clickable links in "pod2html" and similar formatters, and even in the plain text formatters may give "<http://...>" style angles around the URL which is a semi-conventional way to delimit from surrounding text and in particular from an immediately following comma or period.
This is only cosmetic and on that basis this policy is low severity and under the "cosmetic" theme (see "POLICY THEMES" in Perl::Critic).
Only plain text parts of the POD are considered. Verbatim paragraphs cannot have "L<>" markup (and it’s usually a mistake to put it there, as per "ProhibitVerbatimMarkup").
This is verbatim text,
http://somewhere.com # ok in verbatim
Perl 5.8
"L<http://...>" linking of URLs is new in the Perl 5.8 POD specification. It comes out badly from the formatters in earlier Perl where the "/" is taken to be a section delimiter. For that reason this policy only applies if there’s an explicit "use 5.008" or higher in the code.
use 5.005;
=item C<http://foo.org> # ok when don't have Perl 5.8 L<>
Bad URLs
Some obvious intentional dummy URLs like "L<http://example.com>" are ignored. They’re examples and won’t go anywhere as a clickable link. You might like to put "C<>" on them for a typeface, but that is not required by this policy. Currently ignored URL variations are like
http://example.com
http://foo.com
https://foo.org
ftp://bar.org.au
http://quux.com.au
http://xyzzy.co.uk
http://foo.co.nz
http://host:port
http://...
A URL is anything starting "http://", "https://", "ftp://", "news://" or "nntp://".
Begin Blocks
Text in any "=begin :foo" block is checked since ":" means POD markup and it’s likely URLs can be helpfully linked there, even if it’s only for some particular formatter.
Other "=begin" blocks are ignored since "L<>" there will not normally be possible or desirable.
Disabling
If you don’t care about this, if for instance it’s hard enough to get your programmers to write documentation at all without worrying about markup, then disable "RequireLinkedURLs" from your ~/.perlcriticrc file in the usual way (see "CONFIGURATION" in Perl::Critic),
[-Documentation::RequireLinkedURLs]
Perl::Critic::Pulp, Perl::Critic, Perl::Critic::Policy::Documentation::RequirePodLinksIncludeText
<http://user42.tuxfamily.org/perl-critic-pulp/index.html>
Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2019, 2021 Kevin Ryde
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