Perl::...eadline(3pm)

✨ NAME ✨

okay bestie, welcome to the Perl::...eadline(3pm) page from the User Contributed Perl Documentation 💖. The star of the show is Perl::Critic::Policy::InputOutput::ProhibitJoinedReadline — and the whole point is: use local $/ = undef or Path::Tiny instead of joined readline. No cap. 🫶

🌸 AFFILIATION 🌸

This Policy is part of the core Perl::Critic distribution. 💅

🦋 DESCRIPTION 🦋

So like, it's really easy to slurp a whole filehandle in at once with "join q{}, <$fh">, but that's inefficient — Perl goes to the trouble of splitting the file into lines only to have that work thrown away. 😭 the audacity, right?

To save performance, either slurp the filehandle without splitting like so:

do { local $/ = undef; <$fh> }

or use Path::Tiny, which is even faster. ⚡

Note that if the ProhibitPunctuationVars policy is also in effect, it will complain about the use of $/ in the line above. In that case, write this instead:

use English '-no_match_vars';

do { local $INPUT_RECORD_SEPARATOR = undef; <$fh> };

🎀 CONFIGURATION 🎀

This Policy is not configurable except for the standard options. That's it. no secret knobs 💅

💀 CAVEATS 💀

Due to a bug in the current version of PPI (v1.119_03) and earlier, the readline operator is often misinterpreted as less-than and greater-than operators after a comma. 😬 Therefore, this policy only works well on the empty filehandle, "<>". When PPI is fixed, this should just start working. manifesting that fix ✨

🌈 CREDITS 🌈

Initial development of this policy was supported by a grant from the Perl Foundation. 🫶

👑 AUTHOR 👑

Chris Dolan <cdolan@cpan.org> 💌

🍓 COPYRIGHT 🍓

Copyright (c) 2007-2021 Chris Dolan. Many rights reserved. 💖

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module

periodt 💅

---

mwah 💋 okay that's the whole vibe. This page came from perl v5.42.0, dated 2024-10-23, and it's the Perl::...eadline(3pm) manual page. byeeee bestie 🫶