NAME

Evo::Export

VERSION

version 0.0173

DESCRIPTION

Standart Exporter wasn't good enough for me, so I've written a new one from the scratch

SYNOPSYS

# need separate file My/Lib.pm
package My::Lib;
use Evo '-Export *';

# export foo
sub foo : Export { say 'foo' }

# export other as bar
sub other : Export(bar) { say 'bar' }

# test.pl
package main;
use Evo;
use My::Lib '*';
foo();
bar();

RUNNING EXAMPLES

!!!Pay attention. Too keep examples inlined, we use "-Loaded", to mark inline packages as loaded. If you got "Can't load..." or "My::Lib exports nothing" or similar error, don't forget it.

for example:

package main;
use Evo;

{

  package My::Lib;
  use Evo '-Export *; -Loaded; -Modern';

  BEGIN {
    export_gen foo => sub ($class) {
      say "$class requested me";
      sub {"hello, $class"};
    };
  }
};


use My::Lib '*';
foo();

-Loaded is neccessary for use, and BEGIN for export_gen

In the real code, if you module has it's own file (and perl can read it) you don't need Evo::Loaded or BEGIN

IMPORTING

use Evo;
use Evo::Eval 'eval_try';
use Evo::Promises 'promise', 'deferred';

For convenient, you can load all above in one line

use Evo '-Eval eval_try; -Promises promise, deferred';

shortcuts

You can you shortcuts: - is replaced by Evo

# the same, but shorter
use Evo '-Promises promise';

And these make sense in the package and depends on the package name where is used

: means relative to the current module as a child

package My::App;
use Evo ':Bar'; # My::App::Bar

:: means as sibling (child of the parent of the current module)

package My::App;
use Evo '::Bar'; # My::Bar

* means load all

use Evo '-Promises *';

what to import and how

You can rename subroutines to avoid method clashing

# import promise as prm
use Evo '-Promises promise:prm';

You can use * with exclude - for convinient

# import all except "deferred"
use Evo '-Promises *, -deferred';

If one name clashes with yours, you can import all except that name and import renamed version of that name

# import all as is but only deferred will be renamed to "renamed_deferred"
use Evo '-Promises *, -deferred, deferred:renamed_deferred';

EXPORTING

Using attribute Export

package main;
use Evo;

{

  package My::Lib;
  use Evo -Loaded;
  use Evo '-Export *';

  sub foo : Export {say 'foo'}

}

use My::Lib 'foo';
foo();

Pay attention that module should export '*', to install all unneccessary stuff, including MODIFY_CODE_ATTRIBUTES and import. But if you want, you can import them by hand, and this isn't recommended

You can export with another name

# export as bar
sub foo : Export(bar) {say 'foo'}

Features

Pay attention, to explore all feature, you need store packages in the real separate file, -Loaded won't always work. (or wrap them in BEGIN blocks)

export 'foo';

Export signature is more preffered way, but if you wish

# export foo
export 'foo';

# export "foo" under name "bar"
export 'foo:bar';

Trying to export not existing subroitine will cause an exception

export_anon

Export function, that won't be available in the source class

# My::Lib now exports foo, but My::Lib::foo doesn't exist
export_anon foo => sub { say "hello" };

export_proxy

# reexport all from My::Other
export_proxy 'My::Other', '*';


# reexport "foo" from My::Other
export_proxy 'My::Other', 'foo';

# reexport "foo" from My::Other as "bar"
export_proxy 'My::Other', 'foo:bar';

export_gen

package main;
use Evo;

{

  # BEGIN and Loaded only for copy-paste example
  package My::Lib;
  use Evo '-Export *; -Loaded; -Modern';

  BEGIN {
    export_gen foo => sub ($class) {
      say "$class requested me";
      sub {"hello, $class"};
    };
  }
};


use My::Lib '*';
foo();

Very powefull and most excited feature. Evo::Export export generators, that produces subroutines. Consider it as a 3nd dimension in 3d programming

Implementation garanties that one module will get the same (cashed) generated unit (if it'l import twice or import from module that reimport the same thing), but different module will get another one

use Evo::Comp 'has'; 
use Evo::Comp 'has'; 

has was imported twice, but generated only once. If some class will do something export_proxy 'Evo::Comp', 'has', you can export that has and it will be the same subroutine

For example, you can use it to check, if requester component has some methods and than use it directly, if $self->method() isn't good choise

export_gen foo => sub ($class) {
  my $method = $class->can("name") or die "provide name";
  sub { say $method->() };
};

AUTHOR

alexbyk.com

COPYRIGHT AND LICENSE

This software is copyright (c) 2015 by alexbyk.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

cpanm Evo

perl -MCPAN -e shell
install Evo