lib/readline/callback.rb
# Set up the terminal for readline I/O and display the initial
# expanded value of prompt. Save the value of `block` to call when a
# complete line of input has been entered.
#
# A reference to the handler is saved in an instance variable so
# that it will not be garbage collected.  Subsequent calls to
# #handler_install will displace this reference.  A call to
# #handler_remove will remove the reference.
#
# @param [String] prompt
#
# @yield [String] a handler taking the text of the line as the sole
# argument, called when a complete line of input has been entered.
Set up the terminal for readline I/O and display the initial
expanded value of prompt. Save the value of `block` to call when a
complete line of input has been entered.

A reference to the handler is saved in an instance variable so
that it will not be garbage collected.  Subsequent calls to
handler_install will displace this reference.  A call to
handler_remove will remove the reference.
Set up the terminal for readline I / O and display the initial expanded value of prompt . Save the value of ` block ` to call when a complete line of input has been entered . A reference to the handler is saved in an instance variable so that it will not be garbage collected . Subsequent calls to handler_install will displace this reference . A call to handler_remove will remove the reference .
def callback_handler_install(prompt = nil, &block)
      raise ArgumentError, 'block is required' unless block
      @rl_callback_handler = block
      rl_callback_handler_install(prompt, block)
    end
def callback_handler_install ( prompt = nil , & block ) raise ArgumentError , 'block is required' unless block @rl_callback_handler = block rl_callback_handler_install ( prompt , block ) end
Set up the terminal for readline I/O and display the initial
expanded value of prompt.
Set up the terminal for readline I / O and display the initial expanded value of prompt .
prompt
<not_specific>
block
<not_specific>
<not_specific>
None
]
<not_specific>
a handler taking the text of the line as the sole argument, called when a complete line of input has been entered.
a handler taking the text of the line as the sole argument called when a complete line of input has been entered .