Description: Look mum, no -M
$ perll -le 'print Dev::Bollocks->rand' apprehensively repurpose essential meta-services
# bash alias
alias perll="perl -MClass::Autouse=:superloader"
Adding automatic installation is an exercise for the reader
Replies are listed 'Best First'.
Re: Shorten one liners with Class::Autouse
by xdg (Monsignor) on Mar 23, 2007 at 14:09 UTC

    Interesting approach. Personally, I shorten one-liners by preloading common modules using a custom ToolSet.

    package XDG; our $VERSION = "0.02"; use base 'ToolSet'; ToolSet->set_strict(1); ToolSet->set_warnings(1); ToolSet->export( 'Carp' => 'carp croak confess', 'Data::Dump::Streamer' => undef, 'File::Spec' => undef, 'Perl6::Say' => 'say', 'Scalar::Util' => 'refaddr reftype blessed', ); 1; # true

    Used like this:

    perl -MXDG -e 'say "Loaded modules:" and Dump \%INC'


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Re: Shorten one liners with Class::Autouse
by Limbic~Region (Chancellor) on Mar 23, 2007 at 12:47 UTC
    How does this make the one liner shorter? Isn't '->' the same length as '-M'? If I wanted to use more than one exported function (or the same function more than once) from Foo::Bar wouldn't this actually make the 1 liner longer?
    perll -e 'print Foo::Bar->blah()' perl -MFoo::Bar -e 'print blah()' perll -e 'print Foo::Bar->blah(), Foo::Bar->asdf()' perl -MFoo::Bar -e 'print blah(), asdf()'
    I admit that using a one liner is extremely rare for me and I am likely missing something. Would you mind giving a more detailed explanation of how this helps or is it just "cool"?

    Cheers - L~R

      It depends on the module, if Foo::Bar exports a procedural interface by default then it won't shorten anything. If it optionally exports functions then you have to type them in the export list (-MFoo::Bar=blah,asdf) in addition to the code.

      Dev::Bollocks doesn't export anything so you'd need to repeat the module name:

      perl -MDev::Bollocks -le 'print Dev::Bollocks->rand()' perll -le 'print Dev::Bollocks->rand()'
      I often use one liners like this to test drive a module, sometimes to filter things (eg. with Email::Valid). I expect that the -MSome::Long::Name -e '$s=Some::Long::Name->new()' type scripts will shrink nicely.

      BTW, I've only just started using this alias so I don't have a much of feel for it yet...

Re: Shorten one liners with Class::Autouse
by bsb (Priest) on Mar 30, 2007 at 08:13 UTC
    A vaguely related footnote:

    Ending a module with __PACKAGE__; instead of the usual 1; could be used to call a method on the result of the require.

    $ cat package Eg; sub hello { print "Hello World\n"; } __PACKAGE__; $ perl -e '(require Eg)->hello()' Hello World