Shorty

A Ruby gem that provides DSL to add before/after hooks to method calls.

Installation

gem install Shorty

Usage: Ruby

require "Shorty"

include Shorty::DSL

class My_SSH
  def self.restart
  end
end

add :ssh, My_SSH

before :ssh, :restart do
  puts "restarting SSH"
end

after :ssh, :restart do
  puts "SSH has been restarted"
end

run :ssh, :restart 

# --> My_SSH.restart is run with before/after hooks.

You can also use lambdas or a code block:

add :start, lambda { `service ssh restart` }

add :stop do 
  `service ssh stop`
end

before :start, :call, lambda { puts 're-starting ssh' }

after  :stop, :call do
  puts 'ssh stopped'
end

run :start, :call
# --> "lambda { `service ssh restart` }.call" is called.

Shorty is implemented in just one file in case you have any more questions.

Usage: Shorty (executable)

Write a Ruby file, ~/uptime.rb, that uses the Shorty DSL:

add :uptime, lambda { puts 'uptime' }

before :uptime, :run do
  puts "starting uptime"
end

after :uptime, :run do
  puts "finished uptime"
end

run :uptime

In your shell:

Shorty ~/uptime.rb

Usage: Best Practices

You are not allowed to pass arguments to :run calls:

# Not possible:
run :ssh, :restart, "my arg"

This is intentional. You want to put all logic in a separate class/object. For example, let's say you use a different command for SSH start and restart depending on the OS. In your Ruby file, you put:

require "./My_SSH"
add :ssh, My_SSH
run :ssh, :start

In a separate file, My_SSH.rb:

require "ohai"

O = Ohai::System.new
O.require_plugin "linux/platform"

class My_SSH
  class << self

    def start
      case O[:platform]
      when "ubuntu"
        "service ssh start"
      when ...
        ....
      end
    end

  end
end

If :run allowed arguments, you would be very tempted to write Shorty/Ruby code with lots of mixed in logic:

if O[:platform] == 'ubuntu'
  run :ssh, :restart, "sudo service ssh restart"
else
  run :ssh, :restart, "some_program sshd start -now"
end

In summary:

• Write short lines of Shorty/Ruby code.
• Hide complicated logic in separate Ruby classes and objects.

Run Tests

git clone git@github.com:da99/Shorty.git
cd Shorty
bundle update
bundle exec bacon spec/main.rb