Module: OptParse2::Helpers

Defined in:
lib/optparse2/switch-helpers.rb

Overview

Helpers is a mixin that contains methods to modify how the original ‘Switch` works

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#switch_name ⇒ Object 



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# File 'lib/optparse2/switch-helpers.rb', line 14

def switch_name
  defined?(@switch_name) ? @switch_name : super
end

Class Method Details

.summarize ⇒ Object 



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# File 'lib/optparse2/switch-helpers.rb', line 7

def self.summarize(*) end

Instance Method Details

#default ⇒ Object 



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# File 'lib/optparse2/switch-helpers.rb', line 160

def default = @default_proc&.call(switch_name)

#default? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/optparse2/switch-helpers.rb', line 159

def default? = defined?(@default_proc)

#default_bypass? ⇒ Boolean

Calls the default proc to figure out what the default value is for this switch

Returns:

  • (Boolean) 


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# File 'lib/optparse2/switch-helpers.rb', line 158

def default_bypass? = @default_bypass

#default_description ⇒ Object 



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# File 'lib/optparse2/switch-helpers.rb', line 162

def default_description = @default_description || default.inspect

#desc ⇒ Object 



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# File 'lib/optparse2/switch-helpers.rb', line 163

def desc
  return super unless defined? @default_proc
  x = super
  x << '' if x.empty?
  x[-1] += " [default: #{default_description}]"
  x
end

#set_default(value, description, bypass) ⇒ Object

Default values of switches are used when the switch is never passed in. If the ‘value` that’s provided doesn’t respond to ‘.call`, it’s converted to a proc. If ‘bypass` is truthy, then the default value is never passed to the block’s proc (if any)



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# File 'lib/optparse2/switch-helpers.rb', line 142

def set_default(value, description, bypass)
  if @arg.nil? && value != true && !bypass
    raise ArgumentError, "Cannot supply a non-true default value to a flag which takes no arguments", caller(4)
  end

  if defined? value.call
    @default_proc = value
  else
    @default_proc = proc { |_switch_name| value }
  end

  @default_description = description
  @default_bypass = bypass
end

#set_hidden ⇒ Object

Mark the switch as hidden (so it won’t show up in the usage)



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# File 'lib/optparse2/switch-helpers.rb', line 6

def set_hidden
  def self.summarize(*) end
end

#set_multiple(multiple) ⇒ Object 



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# File 'lib/optparse2/switch-helpers.rb', line 18

def set_multiple(multiple)
  old_block = @block
  sw = switch_name.to_sym

  case multiple
  in :first!
    @block = ->(arg, **nil) do
      ctx = OptParse2::Context.current
      if ctx.deferred_options.key? sw
        OptParse2::DONT_ASSIGN
      else
        ctx.deferred_options[sw] = {}
        old_block ? old_block.call(arg) : arg
      end
    end
  in :first
    @block = ->(arg, **nil) do
      ctx = OptParse2::Context.current
      if ctx.deferred_options.key? sw
        OptParse2::DONT_ASSIGN
      else
        ctx.deferred_options[sw] = {
          proc: old_block ? proc{ old_block.call(arg) } : proc { arg }
        }
        OptParse2::DONT_ASSIGN
      end
    end
  in :last!, nil
    # don't do anything, this is the default behaviour
  in :last
    @block = ->(arg, **nil) do
      ctx = OptParse2::Context.current
      ctx.deferred_options[sw] = {
        proc: old_block ? proc { old_block.call(arg) } : proc { arg }
      }

      OptParse2::DONT_ASSIGN
    end
  in :raise
    @block = ->(arg) do
      ctx = OptParse2::Context.current
      if ctx.already_parsed_options.key? sw or ctx.deferred_options.key? sw
        raise OptParse2::ParseError, "encountered repeated option"
      end

      old_block ? old_block.call(arg) : arg
    end

  in :count
    @block = ->(amnt, **nil) do
      ctx = OptParse2::Context.current

      ctx.deferred_options[sw] ||= {
        proc: old_block ? proc { |data| old_block.call(data) } : proc { |data| data },
        data: 0
      }

      if amnt == true || amnt.nil?
        ctx.deferred_options[sw][:data] += 1
      else
        ctx.deferred_options[sw][:data] = amnt
      end

      OptParse2::DONT_ASSIGN
    end

  in :count!
    @block = ->(amnt, *a, **k, &b) do
      ctx = OptParse2::Context.current

      ctx.deferred_options[sw] ||= { data: 0 }

      if amnt == true || amnt.nil?
        ctx.deferred_options[sw][:data] += 1
      else
        ctx.deferred_options[sw][:data] = amnt
      end

      new_amnt = old_block ? old_block.call(ctx.deferred_options[sw][:data], *a, **k, &b) : ctx.deferred_options[sw][:data]
      ctx.deferred_options[sw][:data] = new_amnt unless OptParse2::DONT_ASSIGN.equal? new_amnt

      new_amnt
    end

  in :collect | [:collect, _]
    transform = Array(multiple)[1]
    @block = ->(arg, **nil) do
      ctx = OptParse2::Context.current
      ctx.deferred_options[sw] ||= {
        proc: proc { |data| old_block ? old_block.call(data) : data },
        data: []
      }

      ctx.deferred_options[sw][:data] << (transform ? transform.(arg) : arg)
      OptParse2::DONT_ASSIGN
    end

  else
    raise ArgumentError, "invalid multiple type: #{multiple}", caller(2)
  end
end

#set_switch_name_possibly_block_value(val) ⇒ Object

Same as ‘switch_name`, except it also will set the block to just return the original switch name as a symbol. Useful for group switches which don’t actually have blocks:

op.on '--interactive', key: :mode
op.on '--force', key: :mode

instead of:

op.on '--interactive', key: :mode do :interactive end
op.on '--force', key: :mode do :force end

without this method, passing ‘–interactive` would just set `:mode` to `true`.

This only happens if no block exists, and the argument does not take an arg.



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# File 'lib/optparse2/switch-helpers.rb', line 130

def set_switch_name_possibly_block_value(val)
  if @block.nil? && @arg.nil?
    old_switch_name = switch_name.to_sym
    @block = proc { old_switch_name }
  end

  self.switch_name = val
end