Method: Commander::UI.io

Defined in:
lib/commander/user_interaction.rb

.io(input = nil, output = nil, &block) ⇒ Object

Normalize IO streams, allowing for redirection of input and/or output, for example:

$ foo              # => read from terminal I/O
$ foo in           # => read from 'in' file, output to terminal output stream
$ foo in out       # => read from 'in' file, output to 'out' file
$ foo < in > out   # => equivalent to above (essentially)

Optionally a block may be supplied, in which case IO will be reset once the block has executed.

Examples

command :foo do |c|
  c.syntax = 'foo [input] [output]'
  c.when_called do |args, options|
    # or io(args.shift, args.shift)
    io *args
    str = $stdin.gets
    puts 'input was: ' + str.inspect
  end
end



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# File 'lib/commander/user_interaction.rb', line 217

def io input = nil, output = nil, &block
  $stdin = File.new(input) if input
  $stdout = File.new(output, 'r+') if output
  if block
    yield
    reset_io
  end
end