Module: Capistrano::Configuration::Variables

Included in:
Capistrano::Configuration
Defined in:
lib/capistrano/configuration/variables.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#variables ⇒ Object (readonly)

The hash of variables that have been defined in this configuration instance.



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# File 'lib/capistrano/configuration/variables.rb', line 17

def variables
  @variables
end

Class Method Details

.included(base) ⇒ Object

:nodoc:



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# File 'lib/capistrano/configuration/variables.rb', line 6

def self.included(base) #:nodoc:
  %w(initialize respond_to? method_missing).each do |m|
    base_name = m[/^\w+/]
    punct     = m[/\W+$/]
    base.send :alias_method, "#{base_name}_without_variables#{punct}", m
    base.send :alias_method, m, "#{base_name}_with_variables#{punct}"
  end
end

Instance Method Details

#[](variable) ⇒ Object 



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# File 'lib/capistrano/configuration/variables.rb', line 94

def [](variable)
  fetch(variable, nil)
end

#exists?(variable) ⇒ Boolean

Returns true if the variable has been defined, and false otherwise.

Returns:

  • (Boolean) 


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# File 'lib/capistrano/configuration/variables.rb', line 50

def exists?(variable)
  @variables.key?(variable.to_sym)
end

#fetch(variable, *args) ⇒ Object

Access a named variable. If the value of the variable responds_to? :call, #call will be invoked (without parameters) and the return value cached and returned.



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# File 'lib/capistrano/configuration/variables.rb', line 72

def fetch(variable, *args)
  if !args.empty? && block_given?
    raise ArgumentError, "you must specify either a default value or a block, but not both"
  end

  sym = variable.to_sym
  protect(sym) do
    if !@variables.key?(sym)
      return args.first unless args.empty?
      return yield(variable) if block_given?
      raise IndexError, "`#{variable}' not found"
    end

    if @variables[sym].respond_to?(:call)
      @original_procs[sym] = @variables[sym]
      @variables[sym] = @variables[sym].call
    end
  end

  @variables[sym]
end

#method_missing_with_variables(sym, *args, &block) ⇒ Object

:nodoc:



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# File 'lib/capistrano/configuration/variables.rb', line 118

def method_missing_with_variables(sym, *args, &block) #:nodoc:
  if args.length == 0 && block.nil? && @variables.has_key?(sym)
    self[sym]
  else
    method_missing_without_variables(sym, *args, &block)
  end
end

#reset!(variable) ⇒ Object

If the variable was originally a proc value, it will be reset to it’s original proc value. Otherwise, this method does nothing. It returns true if the variable was actually reset.



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# File 'lib/capistrano/configuration/variables.rb', line 57

def reset!(variable)
  sym = variable.to_sym
  protect(sym) do
    if @original_procs.key?(sym)
      @variables[sym] = @original_procs.delete(sym)
      true
    else
      false
    end
  end
end

#respond_to_with_variables?(sym, include_priv = false) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/capistrano/configuration/variables.rb', line 114

def respond_to_with_variables?(sym, include_priv=false) #:nodoc:
  @variables.has_key?(sym.to_sym) || respond_to_without_variables?(sym, include_priv)
end

#set(variable, *args, &block) ⇒ Object Also known as: []=

Set a variable to the given value.



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# File 'lib/capistrano/configuration/variables.rb', line 20

def set(variable, *args, &block)
  if variable.to_s !~ /^[_a-z]/
    raise ArgumentError, "invalid variable `#{variable}' (variables must begin with an underscore, or a lower-case letter)"
  end

  if !block_given? && args.empty? || block_given? && !args.empty?
    raise ArgumentError, "you must specify exactly one of either a value or a block"
  end

  if args.length > 1
    raise ArgumentError, "wrong number of arguments (#{args.length} for 1)"
  end

  value = args.empty? ? block : args.first
  sym = variable.to_sym
  protect(sym) { @variables[sym] = value }
end

#unset(variable) ⇒ Object

Removes any trace of the given variable.



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# File 'lib/capistrano/configuration/variables.rb', line 41

def unset(variable)
  sym = variable.to_sym
  protect(sym) do
    @original_procs.delete(sym)
    @variables.delete(sym)
  end
end