++ed by:
Matt S Trout


lib::with::preamble - invent your own default perl setup


  use lib::with::preamble 'use v5.16; use strictures 1;', 'lib';

The above will load .pm files from lib/ - but they'll act as if your code always started with 'use v5.16; use strictures 1;'.


To use this in a dist, you'll want to create two files -

  # my/lib.pm
  use lib::with::preamble 'use v5.16; use strictures 1;', 'lib';

  # my/filter
  print "use v5.16;\nuse strictures 1;\n#line 1\n";
  while (<STDIN>) { print }

and then tell your Makefile.PL to use the filter -

    PM_FILTER => 'perl my/filter'

Then during development instead of doing

  $ perl -Ilib bin/script-to-test

you'll want to do -

  $ perl -Mmy::lib bin/script-to-test

and for prove -

  $ PERL5OPT=-Mmy::lib prove t/some-test.t

but once you run

  $ make

your blib/ will get populated with files that already have your preamble added, so

  $ prove -b t/some-test.t

will just work, as will

  $ make test

and when your users install your module, the .pm files will already have the preamble at the top, so your installed files will look like

  # My/Foo.pm
  use v5.16;
  use strictures 1;
  # line 1
  package My::Foo;

and everything should work, without you even needing to add this module as a dependency.

Patches to document an equivalent for those of you using Dist::Zilla (and Module::Build, even if I don't like the bedamned thing) would be very welcome.


This is as much a proof of concept as anything else at this point, so the interface is NOT guaranteed to be stable. Especially since this is meant to be a sort of implicit sugar, and history has proven that other people are much better at designing APIs to sugar than I am.

But provided you're using it the way I describe above, the my/filter script isn't dependent on anything, so your users will be insulated from that.

So please do have a play around and see if it works for you.


mst - Matt S. Trout (cpan:MSTROUT) <mst@shadowcat.co.uk>


None yet. Well volunteered? :)


Copyright (c) 2013 the lib::with::preamble "AUTHOR" and "CONTRIBUTORS" as listed above.


This library is free software and may be distributed under the same terms as perl itself.

Hosting generously
sponsored by Bytemark