Devel::REPL::Plugin::OutputCache - remember past results, _ is most recent
> 21 / 7 3 > _ * _ 9 > sub { die "later" } sub { die "later" } > _->() Runtime error: later
Re-using results is very useful when working in a REPL. With OutputCache
you get _
, which holds the past result. The benefit is that you can build up your result instead of having to type it in all at once, or store it in intermediate variables. OutputCache
also provides $_REPL->output_cache
, an array reference of all results in this session.
Devel::REPL already has a similar plugin, Devel::REPL::Plugin::History. There are some key differences though:
History
remembers input. OutputCache
remembers output.
History
performs regular expressions on your input. OutputCache
provides the _
sub as a hook to get the most recent result, and $_REPL->output_cache
for any other results.
History
will replace exclamation points in any part of the input. This is problematic if you accidentally include one in a string, or in a not
expression. OutputCache
uses a regular (if oddly named) subroutine so Perl does the parsing -- no surprises.
The _
sub is shared across all packages. This means that if a module is using the _
sub, then there is a conflict and you should not use this plugin. For example, Jifty uses the _
sub for localization. Jifty is the only known user.
Devel::REPL
, Devel::REPL::Plugin::History
Shawn M Moore, <sartak at gmail dot com>
Copyright (C) 2007 by Shawn M Moore
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.