Class: XMigra::Console::Menu

Inherits:
Object
  • Object
show all
Defined in:
lib/xmigra/console.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(title, options, prompt, opts = {}) ⇒ Menu

Returns a new instance of Menu.



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# File 'lib/xmigra/console.rb', line 4

def initialize(title, options, prompt, opts={})
  @title = title
  @prompt = prompt
  @title_width = opts[:title_width] || 40
  @title_rule = opts[:title_rule] || '='
  @trailing_newlines = opts[:trailing_newlines] || 3
  get_name = opts[:get_name] || lambda {|o| o.to_s}
  @name_map = {}
  @menu_map = {}
  options.each_with_index do |opt, i|
    opt_name = get_name[opt]
    @name_map[opt_name] = opt
    @menu_map[i + 1] = opt_name
  end
end

Instance Attribute Details

#prompt ⇒ Object (readonly)

Returns the value of attribute prompt.



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# File 'lib/xmigra/console.rb', line 20

def prompt
  @prompt
end

#title ⇒ Object (readonly)

Returns the value of attribute title.



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# File 'lib/xmigra/console.rb', line 20

def title
  @title
end

#title_rule ⇒ Object (readonly)

Returns the value of attribute title_rule.



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# File 'lib/xmigra/console.rb', line 20

def title_rule
  @title_rule
end

#title_width ⇒ Object (readonly)

Returns the value of attribute title_width.



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# File 'lib/xmigra/console.rb', line 20

def title_width
  @title_width
end

#trailing_newlines ⇒ Object (readonly)

Returns the value of attribute trailing_newlines.



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# File 'lib/xmigra/console.rb', line 20

def trailing_newlines
  @trailing_newlines
end

Instance Method Details

#get_selection ⇒ Object 



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# File 'lib/xmigra/console.rb', line 44

def get_selection
  selection = nil
  loop do
    selection = show_once
    break unless selection.nil?
    puts "That input did not uniquely identify one of the available options."
    puts
  end
  @trailing_newlines.times {puts}
  return @name_map[selection]
end

#show_once ⇒ Object 



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# File 'lib/xmigra/console.rb', line 22

def show_once
  Console.output_section(
    title, 
    :trailing_newlines => @trailing_newlines
  ) do
    @menu_map.each_pair do |item_num, name|
      puts "#{item_num.to_s.rjust(4)}. #{name}"
    end
    puts
    print prompt + ': '
    
    user_choice = $stdin.gets.strip
    @menu_map[user_choice.to_i].tap do |mapped|
      return mapped unless mapped.nil?
    end
    return user_choice if @menu_map.values.include? user_choice
    by_prefix = @menu_map.values.select {|e| e.start_with? user_choice}
    return by_prefix[0] if by_prefix.length == 1
  end
  return nil
end