Posts Tagged ‘devel::repl’

I’m somewhat amused at one of the more recent comments here – Nathan L. Walls defends his "choice" of Ruby with some very woolly justifications (emphasis mine):

"Ruby’s community feels more vibrant. No, not something you can measure. It is a feeling."

"Yes, there are equivalents in Perl, but they are far rougher. Again, not really measurable, but a feeling."

Of course, his day job is still writing Perl. Moving swiftly on…


The main thing I got out of the comment apart from a chuckle, was it motivated me to look at Devel::REPL.

One of the other main tools in my toolbox is emacs and when writing emacs lisp, I make full use of the REPL. But I’ve never even wanted an equivalent in Perl.

One cpanm invocation later and I’m ready.

Wait, no I’m not. I copied Caleb’s repl.rc config to make it more usable. I added MultiLine::PPI which resulted in a bunch of errors at start-up. It turns out I need to add File::Next and B::Keywords separately.

$ cpanm File::Next
$ cpanm B::Keywords

Okay, now I’m good to go.

First REPL session

$ jared@localhost $ re.pl
$ sub f
$ {
> say 'h';
> say 'hello';
> }
1 $ f();
Runtime error: Undefined subroutine &Devel::REPL::Plugin::Packages::DefaultScratchpad::f called at (eval 290) line 5.
$ sub f {
> say 'h';
> say 'hello';
> }
$ f();
1 $

It still isn’t quite perfect. But to be honest, I find it (and the Python and irb REPLs) pretty useless. I probably need to look into integrating it with emacs comint.

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