Plugin-API

ruby-talk
1

Hi there,

I’m writing an application in Ruby which should be easy to extend. One
should be able to write a plugin for this application and should be able
to load it with an entry in the config file, e.g.

Load ContentFilter

Perl I would use eval statements like

eval “use $modname”;
die $@ if $@;

to load the plugin. In Perl the plugin would look like the following:

push @{$main::Plugins->{state}},new Module;

package Module;

sub new() {
}
…

1;

What’s the “ruby way” to do this?

Greetings,
CK

2

Hi, –

···

On Thu, Nov 20, 2003, Christian Kruse wrote:

Hi there,

I’m writing an application in Ruby which should be easy to extend. One
should be able to write a plugin for this application and should be able
to load it with an entry in the config file, e.g.

[snip]
What’s the “ruby way” to do this?

Greetings,
CK

Maybe you can have a look at the rbot source code
(http://www.linuxbrit.co.uk) which has a quite good system of plugin
auto discovery (and reload too)

HTH,

Pierre Baillet
It is a good viewpoint to see the world as a dream. When you have something
like a nightmare, you will wake up and tell yourself that it was only a dream.
It is said that the world we live in is not a bit different from this.
Ghost Dog - The Way of the Samouraï

3

“Christian Kruse” ckruse@defunced.de schrieb im Newsbeitrag
news:8mgipb.a13.ln@news.defunced.de…

Hi there,

I’m writing an application in Ruby which should be easy to extend. One
should be able to write a plugin for this application and should be able
to load it with an entry in the config file, e.g.

Load ContentFilter

Perl I would use eval statements like

eval “use $modname”;
die $@ if $@;

to load the plugin. In Perl the plugin would look like the following:

push @{$main::Plugins->{state}},new Module;

package Module;

sub new() {
}
…

1;

What’s the “ruby way” to do this?

Assuming the config file is evaluated as ruby code you can do:

15:33:28 [temp]: for file in PluginBase.rb SomePlugin.rb config.rb
application.rb ; do echo “---- $file ----” ; cat “$file” ; done
---- PluginBase.rb ----
class PluginBase
end

---- SomePlugin.rb ----
require ‘PluginBase’

class PluginClass < PluginBase

functionality

end

$plugin_registry << PluginClass
---- config.rb ----
require ‘SomePlugin’

---- application.rb ----

other classes

$plugin_registry =

eval File.readlines(“config.rb”).join

p $plugin_registry

15:33:36 [temp]:

As easy as that…

robert
4

you may find this thread useful:
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/48648

···

il Thu, 20 Nov 2003 14:47:52 +0100, Christian Kruse ckruse@defunced.de ha scritto::

5

Hoi,

[…]

Thank you very much for your help.

Greetings,
CK