devel::repl::plugin::outputcache(3pm) [debian man page]
Devel::REPL::Plugin::OutputCache(3pm) User Contributed Perl Documentation Devel::REPL::Plugin::OutputCache(3pm) NAME
Devel::REPL::Plugin::OutputCache - remember past results, _ is most recent SYNOPSIS
> 21 / 7 3 > _ * _ 9 > sub { die "later" } sub { die "later" } > _->() Runtime error: later DESCRIPTION
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 "$_REPL->output_cache", an array reference of all results in this session. Devel::REPL already has a similar plugin, Devel::REPL::Plugin::History. There are some key differences though: Input vs Output "History" remembers input. "OutputCache" remembers output. Munging vs Pure Perl "History" performs regular expressions on your input. "OutputCache" provides the "_" sub as a hook to get the most recent result, and "$_REPL->output_cache" for any other results. Principle of Least Surprise "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. CAVEATS
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. SEE ALSO
"Devel::REPL", "Devel::REPL::Plugin::History" AUTHOR
Shawn M Moore, "<sartak at gmail dot com>" COPYRIGHT AND LICENSE
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. perl v5.14.2 2010-05-08 Devel::REPL::Plugin::OutputCache(3pm)
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PDL2(1p) User Contributed Perl Documentation PDL2(1p) NAME
pdl2 - Simple shell (version 2) for PDL SYNOPSIS
Use PDL interactively: %> pdl2 pdl> $a = sequence(10) # or any other perl or PDL command pdl> print "$a = $a "; $a = [0 1 2 3 4 5 6 7 8 9] DESCRIPTION
The "pdl2" program, also known as the Perldl2 shell, is a second generation version of the original "perldl" interactive PDL shell. It attempts to be backward compatible in usage while providing improved features, better support for Perl syntax, and an more easily extended framework based on the Devel::REPL shell. If you have Devel::REPL version 1.003011 or later, then "pdl2" will start with full functionality. If Devel::REPL is not installed or found then "pdl2" will print a warning and run the legacy "perldl" shell command instead. By default, command lines beginning with the default prompt of either "pdl2" or "perldl" (one of 'pdl> ', 'PDL> ', or 'perldl> ') will have the prefix string and surrounding whitespace stripped. This allows for easy cut-and-paste from sample PDL shell sessions or other examples into another PDL shell session. FUNCTIONS
do_print Toggle print-by-default on and off (default value: off) By default, "pdl2" does not print the results of operations since the results can be very large (e.g., a small 640x480 RGBA image is still more than 1_000_000 elements). However, for experimenting and debugging more complex structures, it helps to see the results of every operation. The "do_print" routine allows you to toggle between the default "quiet" operation and a full Read, Evaluate, Loop style. pdl> $a = pdl(3,2) pdl> do_print 1 pdl> $a = pdl(3,2) $PDL1 = [3 2]; pdl> do_print pdl> $a = pdl(3,2) VARIABLES
$PDL::toolongtoprint The maximal size pdls to print (defaults to 10000 elements). This is not just a "perldl" or "pdl2" variable but it is something that is usually needed in an interactive debugging session. SEE ALSO
perldl, Devel::REPL perl v5.14.2 2012-05-19 PDL2(1p)