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[EP-tech] Re: Altering DajaObj/Eprint.pm behaviour without altering core code

On 04/04/12 15:49, John Salter wrote:

I really meant to suggest making the change in ~/archives/[ID]/cfg/cfg.d/core_overrides.pl
  - would a change in there result in this inheritance?
I think it would since EPrints::DataObj::EPrint.pm is loaded once by the webserver and you're changing it. 

What about Tim Brody's suggestion? That would be rather clean.

Alternatively, try something like that:

*EPrints::DataObj::EPrint::render_fileinfo = \&patched_render_fileinfo;


sub patched_render_fileinfo
{
	my( $session, $field, $value, $alllangs, $nolink, $eprint ) = @_;

	if( $session->can_call( 'local_render_fileinfo' ) )
	{
		return $session->call( 'local_render_fileinfo', $session, $field, $value, $alllangs, $nolink, $eprint );
	}

	# original render_fileinfo code follows:
	# ...
}

$c->{local_render_fileinfo} = sub {

	# your custom code

};
If you don't define $c->{local_render_fileinfo} in your other repositories, then the original code will be executed. 

Seb.


I need to make the change in one archive only!

Cheers,
John

-----Original Message-----
From: eprints-tech-bounces@ecs.soton.ac.uk [mailto:eprints-tech-bounces@ecs.soton.ac.uk] On Behalf Of Sebastien Francois
Sent: 04 April 2012 15:41
To: eprints-tech@ecs.soton.ac.uk
Subject: [EP-tech] Re: Altering DajaObj/Eprint.pm behaviour without altering core code

Good! Yes I'd add a file in cfg.d/ as you suggested. However be aware
that other repositories set up there (ie. archives/[id1],
archives/[id2]...) will inherit the change!

Seb.

On 04/04/12 15:33, John Salter wrote:

Thanks Seb, works like a dream!

Do you have any 'good practice' advice on how to do this within an archive?
I already have ~/archives/[ID]/cfg/plugins/... for over-riding plugins.
Would your advice be to add something within there, or to add something like cfg.d/core_overrides.pl?

Cheers,
John

-----Original Message-----
From: eprints-tech-bounces@ecs.soton.ac.uk [mailto:eprints-tech-bounces@ecs.soton.ac.uk] On Behalf Of Sebastien Francois
Sent: 04 April 2012 12:29
To: eprints-tech@ecs.soton.ac.uk
Subject: [EP-tech] Re: Altering DajaObj/Eprint.pm behaviour without altering core code

What about:

*EPrints::DataObj::EPrint::render_fileinfo = \&my_render_fileinfo;

sub my_render_fileinfo
{
# your code ...
}

Seb.


On 04/04/12 12:18, John Salter wrote:

I'm trying to do something the 'right way'*.
This advice: http://wiki.eprints.org/w/Read_Only_Directories says I shouldn't be editing anything under eprints3/perl_lib/ (with a couple of exceptions).

I need to alter the 'render_fileinfo' subroutine in ~/perl_lib/EPrints/DataObj/EPrint.pm.
How do I achieve this without:
    - altering the Eprint.pm file
    - ending up with some 'Subroutine render_fileinfo redefined' messages
    - using "no warnings 'redefine';" ;o)

I've tried various attempts - without success.
I'm sure it can be done, and I'm sure it's a bit of perl magic I'm missing, and hopefully someone here can help!

Cheers,
John

*http://blogs.ecs.soton.ac.uk/oneshare/2009/09/25/taking-stock-and-mopping-up-the-mess-i-made-of-eprints/
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