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Use a File for IO with irb, see InputMethod

Methods
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Class Public methods

new(file)

Creates a new input method object

Source: show | on GitHub 

# File ruby/lib/irb/input-method.rb, line 137
def initialize(file)
  @io = file.is_a?(IO) ? file : File.open(file)
  @external_encoding = @io.external_encoding
end

open(file, &block)

Source: show | on GitHub 

# File ruby/lib/irb/input-method.rb, line 126
def open(file, &block)
  begin
    io = new(file)
    block.call(io)
  ensure
    io&.close
  end
end

Instance Public methods

close()

Source: show | on GitHub 

# File ruby/lib/irb/input-method.rb, line 168
def close
  @io.close
end

encoding()

The external encoding for standard input.

Source: show | on GitHub 

# File ruby/lib/irb/input-method.rb, line 159
def encoding
  @external_encoding
end

eof?()

Whether the end of this input method has been reached, returns true if there is no more data to read.

See IO#eof? for more information.

Source: show | on GitHub 

# File ruby/lib/irb/input-method.rb, line 146
def eof?
  @io.closed? || @io.eof?
end

gets()

Reads the next line from this input method.

See IO#gets for more information.

Source: show | on GitHub 

# File ruby/lib/irb/input-method.rb, line 153
def gets
  print @prompt
  @io.gets
end

inspect()

For debug message

Source: show | on GitHub 

# File ruby/lib/irb/input-method.rb, line 164
def inspect
  'FileInputMethod'
end