93 lines
2.9 KiB
Ruby
93 lines
2.9 KiB
Ruby
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 |