Class: BaseApp

Inherits:
Object
  • Object
show all
Defined in:
lib/base_app.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ BaseApp

Returns a new instance of BaseApp.



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# File 'lib/base_app.rb', line 7

def initialize
  @status = 0
  @options = {}
  @required_opts = []
end

Instance Attribute Details

#status ⇒ Object

Returns the value of attribute status.



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# File 'lib/base_app.rb', line 5

def status
  @status
end

Class Method Details

.main ⇒ Object 



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# File 'lib/base_app.rb', line 48

def self.main
  app = self.new
  app.parse_command_line_options
  max_width = app.command_line_arguments.map {|x| x[1].length}.max
  if app.verbose
    $stderr.puts "#$0 Parameters:"
    app.command_line_arguments.each do |opt_spec|
      short, arg, descr = opt_spec
      option = arg.gsub(/=$/,'').gsub('-','_')
      $stderr.printf( "  %*s : %s\n", max_width, arg.gsub('=',''), app.send(option.to_sym))
    end
    $stderr.puts ""
  end
  app.run
  exit app.status
end

Instance Method Details

#command_line_arguments ⇒ Object 



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# File 'lib/base_app.rb', line 13

def command_line_arguments
  [['v','verbose','Be more verbose']]
end

#construct_opts ⇒ Object 



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# File 'lib/base_app.rb', line 17

def construct_opts
  opts = OptionParser.new do |opts|
    command_line_arguments.each do |argspec|
      short, long, description, required = argspec
      param_name = long.gsub '=', ''
      @required_opts << param_name if required
      create_setter(long)
      opts.on("-#{short}", "--#{long}", description) do |val|
        @options[param_name] = val
        setter = param_name.gsub("-", "_") + "="
        self.send(setter,val)
      end
    end
  end
end

#create_setter(name) ⇒ Object 



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# File 'lib/base_app.rb', line 33

def create_setter(name)
  name = name.gsub("-", "_").gsub("=", "")
  self.class.send(:attr_accessor, name) unless self.respond_to?(name)
end

#parse_command_line_options ⇒ Object 



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# File 'lib/base_app.rb', line 38

def parse_command_line_options
  opts = construct_opts
  opts.parse!
  @required_opts.each do |name|
    unless @options[name]
      raise "Error, required argument '#{name}' must be supplied."
    end
  end
end