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.\"
.IX Title "Devel::REPL::Plugin::OutputCache 3pm"
.TH Devel::REPL::Plugin::OutputCache 3pm "2022-06-03" "perl v5.34.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Devel::REPL::Plugin::OutputCache \- Remember past results, _ is most recent
.SH "VERSION"
.IX Header "VERSION"
version 1.003029
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 8
\&    > 21 / 7
\&    3
\&    > _ * _
\&    9
\&    > sub { die "later" }
\&    sub { die "later" }
\&    > _\->()
\&    Runtime error: later
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Re-using results is very useful when working in a \s-1REPL.\s0 With \f(CW\*(C`OutputCache\*(C'\fR you
get \f(CW\*(C`_\*(C'\fR, 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. \f(CW\*(C`OutputCache\*(C'\fR also provides
\&\f(CW\*(C`$_REPL\->output_cache\*(C'\fR, an array reference of all results in this session.
.PP
Devel::REPL already has a similar plugin, Devel::REPL::Plugin::History.
There are some key differences though:
.IP "Input vs Output" 4
.IX Item "Input vs Output"
\&\f(CW\*(C`History\*(C'\fR remembers input. \f(CW\*(C`OutputCache\*(C'\fR remembers output.
.IP "Munging vs Pure Perl" 4
.IX Item "Munging vs Pure Perl"
\&\f(CW\*(C`History\*(C'\fR performs regular expressions on your input. \f(CW\*(C`OutputCache\*(C'\fR provides
the \f(CW\*(C`_\*(C'\fR sub as a hook to get the most recent result, and
\&\f(CW\*(C`$_REPL\->output_cache\*(C'\fR for any other results.
.IP "Principle of Least Surprise" 4
.IX Item "Principle of Least Surprise"
\&\f(CW\*(C`History\*(C'\fR will replace exclamation points in any part of the input. This is
problematic if you accidentally include one in a string, or in a \f(CW\*(C`not\*(C'\fR
expression. \f(CW\*(C`OutputCache\*(C'\fR uses a regular (if oddly named) subroutine so Perl
does the parsing \*(-- no surprises.
.SH "CAVEATS"
.IX Header "CAVEATS"
The \f(CW\*(C`_\*(C'\fR sub is shared across all packages. This means that if a module is
using the \f(CW\*(C`_\*(C'\fR sub, then there is a conflict and you should not use this
plugin. For example, Jifty uses the \f(CW\*(C`_\*(C'\fR sub for localization. Jifty is the
only known user.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\f(CW\*(C`Devel::REPL\*(C'\fR, \f(CW\*(C`Devel::REPL::Plugin::History\*(C'\fR
.SH "SUPPORT"
.IX Header "SUPPORT"
Bugs may be submitted through the \s-1RT\s0 bug tracker <https://rt.cpan.org/Public/Dist/Display.html?Name=Devel-REPL>
(or bug\-Devel\-REPL@rt.cpan.org <mailto:bug-Devel-REPL@rt.cpan.org>).
.PP
There is also an irc channel available for users of this distribution, at
\&\f(CW\*(C`#devel\*(C'\fR on \f(CW\*(C`irc.perl.org\*(C'\fR <irc://irc.perl.org/#devel-repl>.
.SH "AUTHOR"
.IX Header "AUTHOR"
Shawn M Moore, \f(CW\*(C`<sartak at gmail dot com>\*(C'\fR
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright (C) 2007 by Shawn M Moore
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.