Module: Mongrel::Command::Base

Defined in:
lib/mongrel/command.rb

Overview

A Command pattern implementation used to create the set of command available to the user from Mongrel. The script uses objects which implement this interface to do the user’s bidding.

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#done_validating ⇒ Object (readonly)

Returns the value of attribute done_validating.



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# File 'lib/mongrel/command.rb', line 17

def done_validating
  @done_validating
end

#valid ⇒ Object (readonly)

Returns the value of attribute valid.



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# File 'lib/mongrel/command.rb', line 17

def valid
  @valid
end

Instance Method Details

#failure(message) ⇒ Object

Just a simple method to display failure until something better is developed.



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# File 'lib/mongrel/command.rb', line 104

def failure(message)
  STDERR.puts "!!! #{message}"
end

#help ⇒ Object

Returns a help message. Defaults to OptionParser#help which should be good.



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# File 'lib/mongrel/command.rb', line 67

def help
  @opt.help
end

#initialize(options = {}) ⇒ Object

Called by the subclass to setup the command and parse the argv arguments. The call is destructive on argv since it uses the OptionParser#parse! function.



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# File 'lib/mongrel/command.rb', line 34

def initialize(options={})
  argv = options[:argv]
  @opt = OptionParser.new
  @valid = true
  # this is retarded, but it has to be done this way because -h and -v exit
  @done_validating = false
  @original_args = argv.dup

  configure

  # I need to add my own -h definition to prevent the -h by default from exiting.
  @opt.on_tail("-h", "--help", "Show this message") do
    @done_validating = true
    puts @opt
  end
  
  # I need to add my own -v definition to prevent the -h from exiting by default as well.
  @opt.on_tail("--version", "Show version") do
    @done_validating = true
    if VERSION
      puts "Version #{VERSION}"
    end
  end
  
  @opt.parse! options[:argv]
end

#options(opts) ⇒ Object

Called by the implemented command to set the options for that command. Every option has a short and long version, a description, a variable to set, and a default value. No exceptions.



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# File 'lib/mongrel/command.rb', line 22

def options(opts)
  # process the given options array
  opts.each do |short, long, help, variable, default|
    self.instance_variable_set(variable, default)
    @opt.on(short, long, help) do |arg|
      self.instance_variable_set(variable, arg)
    end
  end
end

#run ⇒ Object

Runs the command doing it’s job. You should implement this otherwise it will throw a NotImplementedError as a reminder.

Raises:

  • (NotImplementedError) 


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# File 'lib/mongrel/command.rb', line 73

def run
  raise NotImplementedError
end

#valid?(exp, message) ⇒ Boolean

Validates the given expression is true and prints the message if not, exiting.

Returns:

  • (Boolean) 


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# File 'lib/mongrel/command.rb', line 79

def valid?(exp, message)
  if not @done_validating and (not exp)
    failure message
    @valid = false
    @done_validating = true
  end
end

#valid_dir?(file, message) ⇒ Boolean

Validates that the given directory exists

Returns:

  • (Boolean) 


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# File 'lib/mongrel/command.rb', line 99

def valid_dir?(file, message)
  valid?(file != nil && File.directory?(file), message)
end

#valid_exists?(file, message) ⇒ Boolean

Validates that a file exists and if not displays the message

Returns:

  • (Boolean) 


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# File 'lib/mongrel/command.rb', line 88

def valid_exists?(file, message)
  valid?(file != nil && File.exist?(file), message)
end

#valid_file?(file, message) ⇒ Boolean

Validates that the file is a file and not a directory or something else.

Returns:

  • (Boolean) 


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# File 'lib/mongrel/command.rb', line 94

def valid_file?(file, message)
  valid?(file != nil && File.file?(file), message)
end

#validate ⇒ Object

Returns true/false depending on whether the command is configured properly.



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# File 'lib/mongrel/command.rb', line 62

def validate
  return @valid
end