I said I couldn’t do it

It was not long ago I said in the Sentinel Update I didn’t know how to do plugins. Well less than a week after writing it I was reading a few articles by Gregory Brown on modules and Mixins. These are the first time I’ve read something that explains them in a way I actually understand.

I was doing research into modules and mixins as they seemed a bit pointless but thanks to the articles by Gregory I was able to understand them and right in the middle of reading some of the examples and having a play a lightning bolt struck me, it all became clear on how to implement the a plugin manager.

Some Bad Code

Based on some of the stuff I saw I came up with the following, ignore most of it I was just hacking around to see if I could get it to work the names meant more in a previous iteration.

module PluginManager
#Just seeing if this works like magic...
    class LoadPlugin
        def initialize
            #The key is a plugin_name the &block is the code so in theory when initialzed it can be run
            @plugins={} unless !@plugins.nil?
        end

        def add_plugin (key,&block)
            @plugins.merge!({key=>block})
        end

        def run_plugin (key)
            puts "Plugin to Run = #{key}"
            puts "Plugin does:\n"
            @plugins[key].call

        end

        def list_plugins
            @plugins.each_key {|key| puts key}
        end
    end

end

plugins = PluginManager::LoadPlugin.new

plugins.add_plugin (:say_hello) do
    puts "Hello"
end

plugins.add_plugin (:count_to_10) do
    for i in 0..10
        puts "#{i}"
    end
end

plugins.add_plugin (:woop) do
    puts "Wooop!"
end

plugins.add_plugin (:say_goodbye) do
    puts "Good Bye :D"
end

puts "in theory... Multiple plugins have been loaded"
puts "listing plugins:"
plugins.list_plugins
puts "running plugins:"
plugins.run_plugin (:say_hello)
plugins.run_plugin (:woop)
plugins.run_plugin (:count_to_10)
plugins.run_plugin (:say_goodbye)

And when it runs:

in theory... Multiple plugins have been loaded
listing plugins:
say_hello
count_to_10
woop
say_goodbye
running plugins:
Plugin to Run = say_hello
Plugin does:
Hello
Plugin to Run = woop
Plugin does:
Wooop!
Plugin to Run = count_to_10
Plugin does:
0
1
2
3
4
5
6
7
8
9
10
Plugin to Run = say_goodbye
Plugin does:
Good Bye :D

This is good news I and I really like the site, I will be using it a lot more as I learn more about ruby it explains things really well, and it looks like if you can afford the $8/month you can get a lot more articles by the same guy at practicingruby.com

Summary

So in short… Sentinel will have plugins, I like the blogs at ruby best practices and This blog will also be short :D

Category:
Linux, Ruby
Tags:

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