Class: HighLine

Inherits:
Object show all
Extended by:
SingleForwardable
Includes:
BuiltinStyles, CustomErrors
Defined in:
lib/highline.rb,
lib/highline/list.rb,
lib/highline/menu.rb,
lib/highline/style.rb,
lib/highline/string.rb,
lib/highline/version.rb,
lib/highline/wrapper.rb,
lib/highline/question.rb,
lib/highline/simulate.rb,
lib/highline/terminal.rb,
lib/highline/menu/item.rb,
lib/highline/paginator.rb,
lib/highline/statement.rb,
lib/highline/color_scheme.rb,
lib/highline/custom_errors.rb,
lib/highline/list_renderer.rb,
lib/highline/builtin_styles.rb,
lib/highline/question_asker.rb,
lib/highline/terminal/ncurses.rb,
lib/highline/string_extensions.rb,
lib/highline/template_renderer.rb,
lib/highline/terminal/unix_stty.rb,
lib/highline/terminal/io_console.rb,
lib/highline/question/answer_converter.rb

Overview

:nodoc:

Defined Under Namespace

Modules: BuiltinStyles, CustomErrors, StringExtensions, Wrapper Classes: ColorScheme, List, ListRenderer, Menu, Paginator, Question, QuestionAsker, SampleColorScheme, Simulate, Statement, String, Style, TemplateRenderer, Terminal

Constant Summary collapse

VERSION =

The version of the installed library.

"2.0.2".freeze

Constants included from BuiltinStyles

BuiltinStyles::BASIC_COLORS, BuiltinStyles::COLORS, BuiltinStyles::COLOR_LIST, BuiltinStyles::STYLES, BuiltinStyles::STYLE_LIST

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from BuiltinStyles

included

Constructor Details

#initialize(input = $stdin, output = $stdout, wrap_at = nil, page_at = nil, indent_size = 3, indent_level = 0) ⇒ HighLine

Create an instance of HighLine connected to the given input and output streams.


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# File 'lib/highline.rb', line 102

def initialize(input = $stdin, output = $stdout,
               wrap_at = nil, page_at = nil,
               indent_size = 3, indent_level = 0)
  @input   = input
  @output  = output

  @multi_indent = true
  @indent_size  = indent_size
  @indent_level = indent_level

  self.wrap_at = wrap_at
  self.page_at = page_at

  @header   = nil
  @prompt   = nil
  @key      = nil

  @use_color = default_use_color
  @track_eof = true # The setting used to disable EOF tracking.
  @terminal = HighLine::Terminal.get_terminal(input, output)
end

Class Attribute Details

.color_schemeObject

Pass ColorScheme to set a HighLine color scheme.


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# File 'lib/highline.rb', line 58

def color_scheme
  @color_scheme
end

.default_instanceObject

Returns the value of attribute default_instance


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# File 'lib/highline.rb', line 55

def default_instance
  @default_instance
end

Instance Attribute Details

#indent_levelInteger


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# File 'lib/highline.rb', line 158

def indent_level
  @indent_level
end

#indent_sizeInteger


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# File 'lib/highline.rb', line 155

def indent_size
  @indent_size
end

#inputIO (readonly)


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# File 'lib/highline.rb', line 161

def input
  @input
end

#keyObject

TODO:

We should probably move this into the HighLine::Question object.

When gathering a Hash with HighLine::QuestionAsker#gather_hash, it tracks the current key being asked.


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# File 'lib/highline.rb', line 171

def key
  @key
end

#multi_indentBoolean


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# File 'lib/highline.rb', line 152

def multi_indent
  @multi_indent
end

#outputIO (readonly)


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# File 'lib/highline.rb', line 164

def output
  @output
end

#page_atInteger


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# File 'lib/highline.rb', line 149

def page_at
  @page_at
end

#terminalHighLine::Terminal (readonly)

System specific that responds to #initialize_system_extensions, #terminal_size, #raw_no_echo_mode, #restore_mode, #get_character. It polymorphically handles specific cases for different platforms.


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# File 'lib/highline.rb', line 177

def terminal
  @terminal
end

#track_eofObject

Pass false to turn off HighLine's EOF tracking.


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# File 'lib/highline.rb', line 138

def track_eof
  @track_eof
end

#use_colorObject

Set it to false to disable ANSI coloring


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# File 'lib/highline.rb', line 125

def use_color
  @use_color
end

#wrap_atInteger


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# File 'lib/highline.rb', line 146

def wrap_at
  @wrap_at
end

Class Method Details

.colorize_stringsObject

Adds color support to the base String class


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# File 'lib/highline/string_extensions.rb', line 127

def self.colorize_strings
  ::String.send(:include, StringExtensions)
end

.find_or_create_style(arg) ⇒ Style

Search for a Style with the given properties and return it. If there's no matched Style, it creates one. You can pass a Style, String or a Hash.


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# File 'lib/highline/style.rb', line 30

def self.find_or_create_style(arg)
  if arg.is_a?(Style)
    Style.list[arg.name] || Style.index(arg)
  elsif arg.is_a?(::String) && arg =~ /^\e\[/ # arg is a code
    styles = Style.code_index[arg]
    if styles
      styles.first
    else
      Style.new(code: arg)
    end
  elsif Style.list[arg]
    Style.list[arg]
  elsif HighLine.color_scheme && HighLine.color_scheme[arg]
    HighLine.color_scheme[arg]
  elsif arg.is_a?(Hash)
    Style.new(arg)
  elsif arg.to_s.downcase =~ /^rgb_([a-f0-9]{6})$/
    Style.rgb(Regexp.last_match(1))
  elsif arg.to_s.downcase =~ /^on_rgb_([a-f0-9]{6})$/
    Style.rgb(Regexp.last_match(1)).on
  else
    raise NameError, "#{arg.inspect} is not a defined Style"
  end
end

.find_or_create_style_list(*args) ⇒ Style

Find a Style list or create a new one.

Examples:

Creating a Style list of the combined RED and BOLD styles.

style_list = HighLine.find_or_create_style_list(:red, :bold)

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# File 'lib/highline/style.rb', line 62

def self.find_or_create_style_list(*args)
  name = args
  Style.list[name] || Style.new(list: args)
end

.resetObject

Reset HighLine to default. Clears Style index and resets color_scheme and use_color settings.


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# File 'lib/highline.rb', line 72

def reset
  Style.clear_index
  reset_color_scheme
  reset_use_color
end

.reset_color_schemeObject

Reset color scheme to default (nil)


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# File 'lib/highline.rb', line 66

def reset_color_scheme
  self.color_scheme = nil
end

.String(s) ⇒ HighLine::String

Returns a HighLine::String from any given String.


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# File 'lib/highline/string_extensions.rb', line 7

def self.String(s) # rubocop:disable Naming/MethodName
  HighLine::String.new(s)
end

.Style(*args) ⇒ Style


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# File 'lib/highline/style.rb', line 16

def self.Style(*args)
  args = args.compact.flatten
  if args.size == 1
    find_or_create_style(args.first)
  else
    find_or_create_style_list(*args)
  end
end

.supports_rgb_color?Boolean

For checking if the current version of HighLine supports RGB colors Usage: HighLine.supports_rgb_color? rescue false

using rescue for compatibility with older versions

Note: color usage also depends on HighLine.use_color being set TODO: Discuss removing this method


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# File 'lib/highline.rb', line 83

def supports_rgb_color?
  true
end

.using_color_scheme?Boolean

Returns true if HighLine is currently using a color scheme.


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# File 'lib/highline.rb', line 61

def using_color_scheme?
  true if @color_scheme
end

Instance Method Details

#agree(yes_or_no_question, character = nil) ⇒ Object

A shortcut to HighLine.ask() a question that only accepts “yes” or “no” answers (“y” and “n” are allowed) and returns true or false (true for “yes”). If provided a true value, character will cause HighLine to fetch a single character response. A block can be provided to further configure the question as in HighLine.ask()

Raises EOFError if input is exhausted.


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# File 'lib/highline.rb', line 193

def agree(yes_or_no_question, character = nil)
  ask(yes_or_no_question, ->(yn) { yn.downcase[0] == "y" }) do |q|
    q.validate                 = /\A(?:y(?:es)?|no?)\Z/i
    q.responses[:not_valid]    = 'Please enter "yes" or "no".'
    q.responses[:ask_on_error] = :question
    q.character                = character
    q.completion               = %w[yes no]

    yield q if block_given?
  end
end

#ask(template_or_question, answer_type = nil, &details) ⇒ Object

This method is the primary interface for user input. Just provide a question to ask the user, the answer_type you want returned, and optionally a code block setting up details of how you want the question handled. See #say for details on the format of question, and Question for more information about answer_type and what's valid in the code block.

Raises EOFError if input is exhausted.


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# File 'lib/highline.rb', line 217

def ask(template_or_question, answer_type = nil, &details)
  question = Question.build(template_or_question, answer_type, &details)

  if question.gather
    QuestionAsker.new(question, self).gather_answers
  else
    QuestionAsker.new(question, self).ask_once
  end
end

#choose(*items, &details) ⇒ String

This method is HighLine's menu handler. For simple usage, you can just pass all the menu items you wish to display. At that point, choose() will build and display a menu, walk the user through selection, and return their choice among the provided items. You might use this in a case statement for quick and dirty menus.

However, choose() is capable of much more. If provided, a block will be passed a HighLine::Menu object to configure. Using this method, you can customize all the details of menu handling from index display, to building a complete shell-like menuing system. See HighLine::Menu for all the methods it responds to.

Raises EOFError if input is exhausted.


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# File 'lib/highline.rb', line 245

def choose(*items, &details)
  menu = Menu.new(&details)
  menu.choices(*items) unless items.empty?

  # Set auto-completion
  menu.completion = menu.options

  # Set _answer_type_ so we can double as the Question for ask().
  # menu.option = normal menu selection, by index or name
  menu.answer_type = menu.shell ? shell_style_lambda(menu) : menu.options

  selected = ask(menu)
  return unless selected

  if menu.shell
    if menu.gather
      selection = []
      details = []
      selected.each do |value|
        selection << value[0]
        details << value[1]
      end
    else
      selection, details = selected
    end
  else
    selection = selected
  end

  if menu.gather
    menu.gather_selected(self, selection, details)
  else
    menu.select(self, selection, details)
  end
end

#color(string, *colors) ⇒ String

This method provides easy access to ANSI color sequences, without the user needing to remember to CLEAR at the end of each sequence. Just pass the string to color, followed by a list of colors you would like it to be affected by. The colors can be HighLine class constants, or symbols (:blue for BLUE, for example). A CLEAR will automatically be embedded to the end of the returned String.

This method returns the original string unchanged if use_color? is false.

Examples:

cli = HighLine.new
cli.color("Sustainable", :green, :bold)
# => "\e[32m\e[1mSustainable\e[0m"

# As class method (delegating to HighLine.default_instance)
HighLine.color("Sustainable", :green, :bold)

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# File 'lib/highline.rb', line 321

def color(string, *colors)
  return string unless use_color?
  HighLine.Style(*colors).color(string)
end

#color_code(*colors) ⇒ String

In case you just want the color code, without the embedding and the CLEAR sequence.

Examples:

s = HighLine.Style(:red, :blue)
s.code # => "\e[31m\e[34m"

HighLine.color_code(:red, :blue) # => "\e[31m\e[34m"

cli = HighLine.new
cli.color_code(:red, :blue) # => "\e[31m\e[34m"

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# File 'lib/highline.rb', line 341

def color_code(*colors)
  HighLine.Style(*colors).code
end

#get_response_character_mode(question) ⇒ String

Get response each character per turn


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# File 'lib/highline.rb', line 607

def get_response_character_mode(question)
  terminal.raw_no_echo_mode_exec do
    response = terminal.get_character
    if question.overwrite
      erase_current_line
    else
      echo = question.get_echo_for_response(response)
      say("#{echo}\n")
    end
    question.format_answer(response)
  end
end

#get_response_getc_mode(question) ⇒ String

Get response using #getc


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# File 'lib/highline.rb', line 597

def get_response_getc_mode(question)
  terminal.raw_no_echo_mode_exec do
    response = @input.getc
    question.format_answer(response)
  end
end

#get_response_line_mode(question) ⇒ String

Get response one line at time


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# File 'lib/highline.rb', line 514

def get_response_line_mode(question)
  if question.echo == true && !question.limit
    get_line(question)
  else
    get_line_raw_no_echo_mode(question)
  end
end

#indent(increase = 1, statement = nil, multiline = nil) ⇒ void

This method returns an undefined value.

Executes block or outputs statement with indentation

See Also:


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# File 'lib/highline.rb', line 431

def indent(increase = 1, statement = nil, multiline = nil)
  @indent_level += increase
  multi = @multi_indent
  @multi_indent ||= multiline
  begin
    if block_given?
      yield self
    else
      say(statement)
    end
  ensure
    @multi_indent = multi
    @indent_level -= increase
  end
end

#indentationObject

Outputs indentation with current settings


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# File 'lib/highline.rb', line 419

def indentation
  " " * @indent_size * @indent_level
end

#list(items, mode = :rows, option = nil) ⇒ String

Renders a list of itens using a ListRenderer


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# File 'lib/highline.rb', line 358

def list(items, mode = :rows, option = nil)
  ListRenderer.new(items, mode, option, self).render
end

#new_scopeObject

Creates a new HighLine instance with the same options


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# File 'lib/highline.rb', line 485

def new_scope
  self.class.new(@input, @output, @wrap_at,
                 @page_at, @indent_size, @indent_level)
end

#newlineObject

Outputs newline


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# File 'lib/highline.rb', line 450

def newline
  @output.puts
end

#output_colsObject

Returns the number of columns for the console, or a default it they cannot be determined.


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# File 'lib/highline.rb', line 458

def output_cols
  return 80 unless @output.tty?
  terminal.terminal_size.first
rescue NoMethodError
  return 80
end

#output_rowsObject

Returns the number of rows for the console, or a default if they cannot be determined.


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# File 'lib/highline.rb', line 469

def output_rows
  return 24 unless @output.tty?
  terminal.terminal_size.last
rescue NoMethodError
  return 24
end

#puts(*args) ⇒ Object

Call #puts on the HighLine's output stream


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# File 'lib/highline.rb', line 478

def puts(*args)
  @output.puts(*args)
end

#render_statement(statement) ⇒ Statement

Renders a statement using Statement


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# File 'lib/highline.rb', line 392

def render_statement(statement)
  Statement.new(statement, self).to_s
end

#reset_use_colorObject

Resets the use of color.


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# File 'lib/highline.rb', line 133

def reset_use_color
  @use_color = true
end

#say(statement) ⇒ Object

The basic output method for HighLine objects. If the provided statement ends with a space or tab character, a newline will not be appended (output will be flush()ed). All other cases are passed straight to Kernel.puts().

The statement argument is processed as an ERb template, supporting embedded Ruby code. The template is evaluated within a HighLine instance's binding for providing easy access to the ANSI color constants and the HighLine#color() method.


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# File 'lib/highline.rb', line 373

def say(statement)
  statement = render_statement(statement)
  return if statement.empty?

  statement = (indentation + statement)

  # Don't add a newline if statement ends with whitespace, OR
  # if statement ends with whitespace before a color escape code.
  if /[ \t](\e\[\d+(;\d+)*m)?\Z/ =~ statement
    output.print(statement)
    output.flush
  else
    output.puts(statement)
  end
end

#shell_style_lambda(menu) ⇒ lambda

Convenience method to craft a lambda suitable for beind used in autocompletion operations by #choose


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# File 'lib/highline.rb', line 285

def shell_style_lambda(menu)
  lambda do |command| # shell-style selection
    first_word = command.to_s.split.first || ""

    options = menu.options
    options.extend(OptionParser::Completion)
    answer = options.complete(first_word)

    raise Question::NoAutoCompleteMatch unless answer

    [answer.last, command.sub(/^\s*#{first_word}\s*/, "")]
  end
end

#track_eof?Boolean

Returns true if HighLine is currently tracking EOF for input.


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# File 'lib/highline.rb', line 141

def track_eof?
  true if track_eof
end

#uncolor(string) ⇒ String

Remove color codes from a string.


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# File 'lib/highline.rb', line 348

def uncolor(string)
  Style.uncolor(string)
end

#use_color?Boolean

Returns truethy if HighLine instance is currently using color escapes.


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# File 'lib/highline.rb', line 128

def use_color?
  use_color
end