/usr/lib/ruby/vendor_ruby/net/ssh/prompt.rb is in ruby-net-ssh 1:3.2.0-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | module Net; module SSH
# A basic prompt module that can be mixed into other objects. If HighLine is
# installed, it will be used to display prompts and read input from the
# user. Otherwise, the termios library will be used. If neither HighLine
# nor termios is installed, a simple prompt that echos text in the clear
# will be used.
module PromptMethods
# Defines the prompt method to use if the Highline library is installed.
module Highline
# Uses Highline#ask to present a prompt and accept input. If +echo+ is
# +false+, the characters entered by the user will not be echoed to the
# screen.
def prompt(prompt, echo=true)
@highline ||= ::HighLine.new
@highline.ask(prompt + " ") { |q| q.echo = echo }
end
end
# Defines the prompt method to use if the Termios library is installed.
module Termios
# Displays the prompt to $stdout. If +echo+ is false, the Termios
# library will be used to disable keystroke echoing for the duration of
# this method.
def prompt(prompt, echo=true)
$stdout.print(prompt)
$stdout.flush
set_echo(false) unless echo
$stdin.gets.chomp
ensure
if !echo
set_echo(true)
$stdout.puts
end
end
private
# Enables or disables keystroke echoing using the Termios library.
def set_echo(enable)
term = ::Termios.getattr($stdin)
if enable
term.c_lflag |= (::Termios::ECHO | ::Termios::ICANON)
else
term.c_lflag &= ~::Termios::ECHO
end
::Termios.setattr($stdin, ::Termios::TCSANOW, term)
end
end
# Defines the prompt method to use when neither Highline nor Termios are
# installed.
module Clear
# Displays the prompt to $stdout and pulls the response from $stdin.
# Text is always echoed in the clear, regardless of the +echo+ setting.
# The first time a prompt is given and +echo+ is false, a warning will
# be written to $stderr recommending that either Highline or Termios
# be installed.
def prompt(prompt, echo=true)
@seen_warning ||= false
if !echo && !@seen_warning
$stderr.puts "Text will be echoed in the clear. Please install the HighLine or Termios libraries to suppress echoed text."
@seen_warning = true
end
$stdout.print(prompt)
$stdout.flush
$stdin.gets.chomp
end
end
end
# Try to load Highline and Termios in turn, selecting the corresponding
# PromptMethods module to use. If neither are available, choose PromptMethods::Clear.
Prompt = begin
require 'highline'
HighLine.track_eof = false
PromptMethods::Highline
rescue LoadError
begin
require 'termios'
PromptMethods::Termios
rescue LoadError
PromptMethods::Clear
end
end
end; end
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