Class: Djinn::Base::Dsl::ConfigHelper

Inherits:
Object
  • Object
show all
Defined in:
lib/djinn/base/dsl.rb

Overview

Used internally to read configuration blocks

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(&block) ⇒ ConfigHelper

Returns a new instance of ConfigHelper.



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# File 'lib/djinn/base/dsl.rb', line 43

def initialize &block
  @config_items = []
  instance_eval(&block) if block_given?
end

Instance Attribute Details

#config ⇒ Object

Returns the value of attribute config.



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# File 'lib/djinn/base/dsl.rb', line 41

def config
  @config
end

#config_items ⇒ Object

Returns the value of attribute config_items.



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# File 'lib/djinn/base/dsl.rb', line 41

def config_items
  @config_items
end

Instance Method Details

#add(key, &block) ⇒ Object

Add a posix-style switch to your Djinn



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# File 'lib/djinn/base/dsl.rb', line 49

def add key, &block
  @config_items << ConfigItem.new(:posix, key, &block)
end

#add_flag(key, &block) ⇒ Object

Add a simple flag switch to your daemon



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# File 'lib/djinn/base/dsl.rb', line 54

def add_flag key, &block
  @config_items << ConfigItem.new(:flag, key, &block)
end

#parse_config!(config, &block) ⇒ Object

Parses the configuration items created by executing the configuration block



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# File 'lib/djinn/base/dsl.rb', line 60

def parse_config!(config, &block)
  options = OptionParser.new do |opts|
    opts.banner = "Usage: djinn_file [OPTIONS]"
    opts.on("-N", "--no-daemon", "Don't run in the background") do
      config[:__daemonize] = false
    end
    opts.on("--stop", "Stop the Djinn, if possible") do
      config[:__stop] = true
    end
    opts.on_tail("-h", "--help", "Prints this message") do
      puts opts
      exit(0)
    end
    @config_items.each { |c| c.parse!(opts, config) }
  end
  yield options if block_given?
  options.parse!
  #Apply defaults
  @config_items.each do |ci|
    config[ci.key] = ci.default_value if ci.has_default? unless config.include?(ci.key)
  end
  # Check for missing arguments
  @config_items.each do |ci|
    if ci.required?
      puts "Missing argument: #{ci.key}\n\n#{options}"
      exit(1)
    end unless config.include?(ci.key) or config.include?(:__stop)
  end
rescue OptionParser::InvalidOption => e
  puts e.message
  exit(1)
end