Class: TTY2::Prompt::List Private

Inherits:
Object
  • Object
show all
Defined in:
lib/tty2/prompt/list.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

A class responsible for rendering select list menu Used by TTY2::Prompt to display interactive menu.

Direct Known Subclasses

MultiList

Constant Summary collapse

FILTER_KEYS_MATCHER =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

Allowed keys for filter, along with backspace and canc.

/\A([[:alnum:]]|[[:punct:]])\Z/.freeze
INTEGER_MATCHER =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

Checks type of default parameter to be integer

/\A\d+\Z/.freeze

Instance Method Summary collapse

Constructor Details

#initialize(prompt, **options) ⇒ List

Create instance of TTY2::Prompt::List menu.

Parameters:

  • Hash —

    options the configuration options

  • options (Hash) —

    a customizable set of options

Options Hash (**options):

  • :default (Symbol) —

    the default active choice, defaults to 1

  • :color (Symbol) —

    the color for the selected item, defualts to :green

  • :marker (Symbol) —

    the marker for the selected item

  • :enum (String) —

    the delimiter for the item index



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# File 'lib/tty2/prompt/list.rb', line 36

def initialize(prompt, **options)
  check_options_consistency(options)

  @prompt       = prompt
  @prefix       = options.fetch(:prefix) { @prompt.prefix }
  @enum         = options.fetch(:enum) { nil }
  @default      = Array(options[:default])
  @choices      = Choices.new
  @active_color = options.fetch(:active_color) { @prompt.active_color }
  @help_color   = options.fetch(:help_color) { @prompt.help_color }
  @cycle        = options.fetch(:cycle) { false }
  @filterable   = options.fetch(:filter) { false }
  @symbols      = @prompt.symbols.merge(options.fetch(:symbols, {}))
  @quiet        = options.fetch(:quiet) { @prompt.quiet }
  @filter       = []
  @filter_cache = {}
  @help         = options[:help]
  @show_help    = options.fetch(:show_help) { :start }
  @first_render = true
  @done         = false
  @per_page     = options[:per_page]
  @paginator    = Paginator.new
  @block_paginator = BlockPaginator.new
  @by_page      = false
  @paging_changed = false
end

Instance Method Details

#arrows_help ⇒ String

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Information about arrow keys

Returns:

  • (String) 


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# File 'lib/tty2/prompt/list.rb', line 156

def arrows_help
  up_down = @symbols[:arrow_up] + "/" + @symbols[:arrow_down]
  left_right = @symbols[:arrow_left] + "/" + @symbols[:arrow_right]

  arrows = [up_down]
  arrows << "/" if paginated?
  arrows << left_right if paginated?
  arrows.join
end

#call(question, possibilities, &block) ⇒ Object

Call the list menu by passing question and choices

Parameters:

  • question (String) 


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# File 'lib/tty2/prompt/list.rb', line 239

def call(question, possibilities, &block)
  choices(possibilities)
  @question = question
  block.call(self) if block
  setup_defaults
  @prompt.subscribe(self) do
    render
  end
end

#choice(*value, &block) ⇒ Object

Add a single choice



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# File 'lib/tty2/prompt/list.rb', line 201

def choice(*value, &block)
  @filter_cache = {}
  if block
    @choices << (value << block)
  else
    @choices << value
  end
end

#choices(values = (not_set = true)) ⇒ Object

Add multiple choices, or return them.

Parameters:

  • values (Array[Object]) (defaults to: (not_set = true)) —

    the values to add as choices; if not passed, the current choices are displayed.



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# File 'lib/tty2/prompt/list.rb', line 217

def choices(values = (not_set = true))
  if not_set
    if !filterable? || @filter.empty?
      @choices
    else
      filter_value = @filter.join.downcase
      @filter_cache[filter_value] ||= @choices.enabled.select do |choice|
        choice.name.to_s.downcase.include?(filter_value)
      end
    end
  else
    @filter_cache = {}
    values.each { |val| @choices << val }
  end
end

#default(*default_values) ⇒ Object

Set default option selected



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# File 'lib/tty2/prompt/list.rb', line 78

def default(*default_values)
  @default = default_values
end

#default_help ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Default help text

Note that enumeration and filter are mutually exclusive



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# File 'lib/tty2/prompt/list.rb', line 171

def default_help
  str = []
  str << "(Press "
  str << "#{arrows_help} arrow"
  str << " or 1-#{choices.size} number" if enumerate?
  str << " to move"
  str << (filterable? ? "," : " and")
  str << " Enter to select"
  str << " and letters to filter" if filterable?
  str << ")"
  str.join
end

#enum(value) ⇒ Object

Set selecting active index using number pad



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# File 'lib/tty2/prompt/list.rb', line 187

def enum(value)
  @enum = value
end

#enumerate? ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Check if list is enumerated

Returns:

  • (Boolean) 


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# File 'lib/tty2/prompt/list.rb', line 252

def enumerate?
  !@enum.nil?
end

#help(value = (not_set = true)) ⇒ String

Provide help information

Parameters:

  • value (String) (defaults to: (not_set = true)) —

    the new help text

Returns:

  • (String) 


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# File 'lib/tty2/prompt/list.rb', line 136

def help(value = (not_set = true))
  return @help if !@help.nil? && not_set

  @help = (@help.nil? && !not_set) ? value : default_help
end

#keybackspace ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/tty2/prompt/list.rb', line 367

def keybackspace(*)
  return unless filterable?

  @filter.pop
  @active = 1
end

#keydelete ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/tty2/prompt/list.rb', line 360

def keydelete(*)
  return unless filterable?

  @filter.clear
  @active = 1
end

#keydown ⇒ Object Also known as: keytab

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/tty2/prompt/list.rb', line 293

def keydown(*)
  searchable  = ((@active + 1)..choices.length)
  next_active = search_choice_in(searchable)

  if next_active
    @active = next_active
  elsif @cycle
    searchable = (1..choices.length)
    next_active = search_choice_in(searchable)

    @active = next_active if next_active
  end
  @paging_changed = @by_page
  @by_page = false
end

#keyenter ⇒ Object Also known as: keyreturn, keyspace

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/tty2/prompt/list.rb', line 266

def keyenter(*)
  @done = true unless choices.empty?
end

#keyleft ⇒ Object Also known as: keypage_up

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/tty2/prompt/list.rb', line 338

def keyleft(*)
  if (@active - page_size) > 0
    searchable = ((@active - page_size)..choices.size)
    @active = search_choice_in(searchable)
  elsif @cycle
    searchable = choices.size.downto(1).to_a
    @active = search_choice_in(searchable)
  end
  @paging_changed = !@by_page
  @by_page = true
end

#keynum(event) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/tty2/prompt/list.rb', line 256

def keynum(event)
  return unless enumerate?

  value = event.value.to_i
  return unless (1..choices.count).cover?(value)
  return if choices[value - 1].disabled?

  @active = value
end

#keypress(event) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/tty2/prompt/list.rb', line 351

def keypress(event)
  return unless filterable?

  if event.value =~ FILTER_KEYS_MATCHER
    @filter << event.value
    @active = 1
  end
end

#keyright ⇒ Object Also known as: keypage_down

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Moves all choices page by page keeping the current selected item at the same level on each page.

When the choice on a page is outside of next page range then adjust it to the last item, otherwise leave unchanged.



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# File 'lib/tty2/prompt/list.rb', line 315

def keyright(*)
  choices_size = choices.size
  if (@active + page_size) <= choices_size
    searchable = ((@active + page_size)..choices_size)
    @active = search_choice_in(searchable)
  elsif @active <= choices_size # last page shorter
    current   = @active % page_size
    remaining = choices_size % page_size

    if current.zero? || (remaining > 0 && current > remaining)
      searchable = choices_size.downto(0).to_a
      @active = search_choice_in(searchable)
    elsif @cycle
      searchable = ((current.zero? ? page_size : current)..choices_size)
      @active = search_choice_in(searchable)
    end
  end

  @paging_changed = !@by_page
  @by_page = true
end

#keyup ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/tty2/prompt/list.rb', line 276

def keyup(*)
  searchable  = (@active - 1).downto(1).to_a
  prev_active = search_choice_in(searchable)

  if prev_active
    @active = prev_active
  elsif @cycle
    searchable  = choices.length.downto(1).to_a
    prev_active = search_choice_in(searchable)

    @active = prev_active if prev_active
  end

  @paging_changed = @by_page
  @by_page = false
end

#page_size ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/tty2/prompt/list.rb', line 115

def page_size
  (@per_page || Paginator::DEFAULT_PAGE_SIZE)
end

#paginated? ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Check if list is paginated

Returns:

  • (Boolean) 


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# File 'lib/tty2/prompt/list.rb', line 124

def paginated?
  choices.size > page_size
end

#paginator ⇒ Paginator

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Select paginator based on the current navigation key

Returns:



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# File 'lib/tty2/prompt/list.rb', line 87

def paginator
  @by_page ? @block_paginator : @paginator
end

#per_page(value) ⇒ Object

Set number of items per page



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# File 'lib/tty2/prompt/list.rb', line 111

def per_page(value)
  @per_page = value
end

#quiet(value) ⇒ Object

Set whether selected answers are echoed



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# File 'lib/tty2/prompt/list.rb', line 194

def quiet(value)
  @quiet = value
end

#search_choice_in(searchable) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/tty2/prompt/list.rb', line 272

def search_choice_in(searchable)
  searchable.find { |i| !choices[i - 1].disabled? }
end

#show_help(value = (not_set = true)) ⇒ Object

Change when help is displayed



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# File 'lib/tty2/prompt/list.rb', line 145

def show_help(value = (not_set = true))
  return @show_ehlp if not_set

  @show_help = value
end

#symbols(new_symbols = (not_set = true)) ⇒ Object

Change symbols used by this prompt

Parameters:

  • new_symbols (Hash) (defaults to: (not_set = true)) —

    the new symbols to use



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# File 'lib/tty2/prompt/list.rb', line 69

def symbols(new_symbols = (not_set = true))
  return @symbols if not_set

  @symbols.merge!(new_symbols)
end

#sync_paginators ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Synchronize paginators start positions



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# File 'lib/tty2/prompt/list.rb', line 94

def sync_paginators
  if @by_page
    if @paginator.start_index
      @block_paginator.reset!
      @block_paginator.start_index = @paginator.start_index
    end
  else
    if @block_paginator.start_index
      @paginator.reset!
      @paginator.start_index = @block_paginator.start_index
    end
  end
end