93 lines
2.9 KiB
Ruby
93 lines
2.9 KiB
Ruby
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module Net; module SSH
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# A basic prompt module that can be mixed into other objects. If HighLine is
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# installed, it will be used to display prompts and read input from the
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# user. Otherwise, the termios library will be used. If neither HighLine
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# nor termios is installed, a simple prompt that echos text in the clear
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# will be used.
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module PromptMethods
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# Defines the prompt method to use if the Highline library is installed.
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module Highline
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# Uses Highline#ask to present a prompt and accept input. If +echo+ is
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# +false+, the characters entered by the user will not be echoed to the
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# screen.
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def prompt(prompt, echo=true)
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@highline ||= ::HighLine.new
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@highline.ask(prompt + " ") { |q| q.echo = echo }
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end
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end
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# Defines the prompt method to use if the Termios library is installed.
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module Termios
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# Displays the prompt to $stdout. If +echo+ is false, the Termios
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# library will be used to disable keystroke echoing for the duration of
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# this method.
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def prompt(prompt, echo=true)
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$stdout.print(prompt)
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$stdout.flush
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set_echo(false) unless echo
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$stdin.gets.chomp
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ensure
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if !echo
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set_echo(true)
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$stdout.puts
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end
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end
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private
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# Enables or disables keystroke echoing using the Termios library.
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def set_echo(enable)
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term = ::Termios.getattr($stdin)
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if enable
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term.c_lflag |= (::Termios::ECHO | ::Termios::ICANON)
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else
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term.c_lflag &= ~::Termios::ECHO
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end
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::Termios.setattr($stdin, ::Termios::TCSANOW, term)
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end
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end
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# Defines the prompt method to use when neither Highline nor Termios are
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# installed.
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module Clear
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# Displays the prompt to $stdout and pulls the response from $stdin.
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# Text is always echoed in the clear, regardless of the +echo+ setting.
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# The first time a prompt is given and +echo+ is false, a warning will
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# be written to $stderr recommending that either Highline or Termios
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# be installed.
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def prompt(prompt, echo=true)
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@seen_warning ||= false
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if !echo && !@seen_warning
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$stderr.puts "Text will be echoed in the clear. Please install the HighLine or Termios libraries to suppress echoed text."
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@seen_warning = true
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end
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$stdout.print(prompt)
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$stdout.flush
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$stdin.gets.chomp
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end
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end
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end
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# Try to load Highline and Termios in turn, selecting the corresponding
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# PromptMethods module to use. If neither are available, choose PromptMethods::Clear.
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Prompt = begin
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require 'highline'
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HighLine.track_eof = false
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PromptMethods::Highline
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rescue LoadError
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begin
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require 'termios'
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PromptMethods::Termios
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rescue LoadError
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PromptMethods::Clear
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end
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end
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end; end
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