Class: SchemaEvolutionManager::Ask

Inherits:
Object
  • Object
show all
Defined in:
lib/schema-evolution-manager/ask.rb

Overview

Simple library to ask user for input, with easy mocakability for testing

Constant Summary collapse

TRUE_STRINGS = 
['y', 'yes']

Class Method Summary collapse

Class Method Details

.for_boolean(message) ⇒ Object

Asks the user a question. Returns a boolean. Boolean is defined as matching the strings ‘y’ or ‘yes’, case insensitive



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# File 'lib/schema-evolution-manager/ask.rb', line 37

def Ask.for_boolean(message)
  value = Ask.for_string("%s (y/n) " % message)
  TRUE_STRINGS.include?(value.downcase)
end

.for_password(message) ⇒ Object 



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# File 'lib/schema-evolution-manager/ask.rb', line 42

def Ask.for_password(message)
  Ask.for_string(message, :echo => false)
end

.for_string(message, opts = {}) ⇒ Object

Asks the user a question. Expects a string back.

Parameters:

  • default: —

    A default value

  • echo: —

    If true (the default), we echo what the user types to the screen. If false, we do NOT echo.



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# File 'lib/schema-evolution-manager/ask.rb', line 14

def Ask.for_string(message, opts={})
  default = opts.delete(:default)
  echo = opts[:echo].nil? ? true : opts.delete(:echo)
  Preconditions.assert_empty_opts(opts)

  final_message = message.dup
  if default
    final_message << " [%s] " % default
  end

  value = nil
  while value.to_s == ""
    print final_message
    value = get_input(echo).to_s.strip
    if value.to_s == "" && default
      value = default.to_s.strip
    end
  end
  value
end

.get_input(echo) ⇒ Object

here to help with tests



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# File 'lib/schema-evolution-manager/ask.rb', line 47

def Ask.get_input(echo)
  if echo
    STDIN.gets
  else
    settings = `stty -g`.strip
    begin
      `stty -echo`
      input = STDIN.gets
      puts ""
    ensure
      `stty #{settings}`
    end
    input
  end
end