A HighLine object is a "high-level line oriented" shell over an input and an output stream. HighLine simplifies common console interaction, effectively replacing puts() and gets(). User code can simply specify the question to ask and any details about user interaction, then leave the rest of the work to HighLine. When HighLine.ask() returns, you'll have the answer you requested, even if HighLine had to ask many times, validate results, perform range checking, convert types, etc.
simulate.rb
Created by Andy Rossmeissl on 2012-04-29. Copyright 2005 Gray Productions. All rights reserved. This is Free Software. See LICENSE and COPYING for details.
adapted from gist.github.com/194554
color_scheme.rb
Created by Richard LeBer on 2011-06-27. Copyright 2011. All rights reserved
This is Free Software. See LICENSE and COPYING for details
color_scheme.rb
Created by Jeremy Hinegardner on 2007-01-24 Copyright 2007. All rights reserved
This is Free Software. See LICENSE and COPYING for details
Extensions for class String
HighLine::String is a subclass of String with convenience methods added for colorization.
Available convenience methods include:
* 'color' method e.g. highline_string.color(:bright_blue, :underline) * colors e.g. highline_string.magenta * RGB colors e.g. highline_string.rgb_ff6000 or highline_string.rgb(255,96,0) * background colors e.g. highline_string.on_magenta * RGB background colors e.g. highline_string.on_rgb_ff6000 or highline_string.on_rgb(255,96,0) * styles e.g. highline_string.underline
Additionally, convenience methods can be chained, for instance the following are equivalent:
highline_string.bright_blue.blink.underline highline_string.color(:bright_blue, :blink, :underline) HighLine.color(highline_string, :bright_blue, :blink, :underline)
For those less squeamish about possible conflicts, the same convenience methods can be added to the built-in String class, as follows:
require 'highline' Highline.colorize_strings
These RGB colors are approximate; see en.wikipedia.org/wiki/ANSI_escape_code
for example bold black. Bold without a color displays the system-defined bold color (e.g. red on Mac iTerm)
Embed in a String to clear all previous ANSI sequences. This MUST be done before the program exits!
Alias for WHITE, since WHITE is actually a light gray on Macs
On Mac OSX Terminal, this is black foreground, or bright white background. Also used as base for RGB colors, if available
The version of the installed library.
On Mac OSX Terminal, white is actually gray
# File lib/highline/string_extensions.rb, line 27 def self.String(s) HighLine::String.new(s) end
# File lib/highline/style.rb, line 10 def self.Style(*args) args = args.compact.flatten if args.size==1 arg = args.first if arg.is_a?(Style) Style.list[arg.name] || Style.index(arg) elsif arg.is_a?(::String) && arg =~ /^\e\[/ # arg is a code if styles = Style.code_index[arg] styles.first else Style.new(:code=>arg) end elsif style = Style.list[arg] style 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($1) elsif arg.to_s.downcase =~ /^on_rgb_([a-f0-9]{6})$/ Style.rgb($1).on else raise NameError, "#{arg.inspect} is not a defined Style" end else name = args Style.list[name] || Style.new(:list=>args) end end
This method provides easy access to ANSI color sequences, without the user needing to remember to CLEAR at the end of each sequence. Just pass the string to color, followed by a list of colors you would like it to be affected by. The colors can be HighLine class constants, or symbols (:blue for BLUE, for example). A CLEAR will automatically be embedded to the end of the returned String.
This method returns the original string unchanged if HighLine::use_color? is false.
# File lib/highline.rb, line 376 def self.color( string, *colors ) return string unless self.use_color? Style(*colors).color(string) end
In case you just want the color code, without the embedding and the CLEAR
# File lib/highline.rb, line 382 def self.color_code(*colors) Style(*colors).code end
Returns the current color scheme.
# File lib/highline.rb, line 80 def self.color_scheme @@color_scheme end
Pass ColorScheme to setting to set a HighLine color scheme.
# File lib/highline.rb, line 75 def self.color_scheme=( setting ) @@color_scheme = setting end
# File lib/highline/string_extensions.rb, line 128 def self.colorize_strings ::String.send(:include, StringExtensions) end
For RGB colors:
# File lib/highline.rb, line 148 def self.const_missing(name) if name.to_s =~ /^(ON_)?(RGB_)([A-F0-9]{6})(_STYLE)?$/ # RGB color on = $1 suffix = $4 if suffix code_name = $1.to_s + $2 + $3 else code_name = name.to_s end style_name = code_name + '_STYLE' style = Style.rgb($3) style = style.on if on const_set(style_name, style) const_set(code_name, style.code) if suffix style else style.code end else raise NameError, "Bad color or uninitialized constant #{name}" end end
Create an instance of HighLine, connected to the streams input and output.
# File lib/highline.rb, line 176 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 @question = nil @answer = nil @menu = nil @header = nil @prompt = nil @gather = nil @answers = nil @key = nil initialize_system_extensions if respond_to?(:initialize_system_extensions) end
For checking if the current version of HighLine supports RGB colors Usage: HighLine.supports_rgb_color? rescue false # rescue for compatibility with older versions Note: color usage also depends on HighLine.use_color being set
# File lib/highline.rb, line 54 def self.supports_rgb_color? true end
Pass false to setting to turn off HighLine's EOF tracking.
# File lib/highline.rb, line 62 def self.track_eof=( setting ) @@track_eof = setting end
Returns true if HighLine is currently tracking EOF for input.
# File lib/highline.rb, line 67 def self.track_eof? @@track_eof end
Remove color codes from a string
# File lib/highline.rb, line 397 def self.uncolor(string) Style.uncolor(string) end
Pass false to setting to turn off HighLine's color escapes.
# File lib/highline.rb, line 42 def self.use_color=( setting ) @@use_color = setting end
Returns true if HighLine is currently using color escapes.
# File lib/highline.rb, line 47 def self.use_color? @@use_color end
Returns true if HighLine is currently using a color scheme.
# File lib/highline.rb, line 85 def self.using_color_scheme? not @@color_scheme.nil? end
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.
# File lib/highline.rb, line 222 def agree( yes_or_no_question, character = nil ) ask(yes_or_no_question, lambda { |yn| yn.downcase[0] == yy}) do |q| q.validate = /\Ay(?:es)?|no?\Z/ q.responses[:not_valid] = 'Please enter "yes" or "no".' q.responses[:ask_on_error] = :question q.character = character yield q if block_given? end end
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 HighLine.say() for details on the format of question, and HighLine::Question for more information about answer_type and what's valid in the code block.
If @question is set before ask() is called, parameters are ignored and that object (must be a HighLine::Question) is used to drive the process instead.
Raises EOFError if input is exhausted.
# File lib/highline.rb, line 247 def ask( question, answer_type = String, &details ) # :yields: question @question ||= Question.new(question, answer_type, &details) return gather if @question.gather # readline() needs to handle its own output, but readline only supports # full line reading. Therefore if @question.echo is anything but true, # the prompt will not be issued. And we have to account for that now. # Also, JRuby-1.7's ConsoleReader.readLine() needs to be passed the prompt # to handle line editing properly. say(@question) unless ((JRUBY or @question.readline) and @question.echo == true) begin @answer = @question.answer_or_default(get_response) unless @question.valid_answer?(@answer) explain_error(:not_valid) raise QuestionError end @answer = @question.convert(@answer) if @question.in_range?(@answer) if @question.confirm # need to add a layer of scope to ask a question inside a # question, without destroying instance data context_change = self.class.new(@input, @output, @wrap_at, @page_at, @indent_size, @indent_level) if @question.confirm == true confirm_question = "Are you sure? " else # evaluate ERb under initial scope, so it will have # access to @question and @answer template = ERB.new(@question.confirm, nil, "%") confirm_question = template.result(binding) end unless context_change.agree(confirm_question) explain_error(nil) raise QuestionError end end @answer else explain_error(:not_in_range) raise QuestionError end rescue QuestionError retry rescue ArgumentError, NameError => error raise if error.is_a?(NoMethodError) if error.message =~ /ambiguous/ # the assumption here is that OptionParser::Completion#complete # (used for ambiguity resolution) throws exceptions containing # the word 'ambiguous' whenever resolution fails explain_error(:ambiguous_completion) else explain_error(:invalid_type) end retry rescue Question::NoAutoCompleteMatch explain_error(:no_completion) retry ensure @question = nil # Reset Question object. end end
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.
# File lib/highline.rb, line 327 def choose( *items, &details ) @menu = @question = 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.answer_type = if @menu.shell 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) if answer.nil? raise Question::NoAutoCompleteMatch end [answer.last, command.sub(/^\s*#{first_word}\s*/, "")] end else @menu.options # normal menu selection, by index or name end # Provide hooks for ERb layouts. @header = @menu.header @prompt = @menu.prompt if @menu.shell selected = ask("Ignored", @menu.answer_type) @menu.select(self, *selected) else selected = ask("Ignored", @menu.answer_type) @menu.select(self, selected) end end
Works as an instance method, same as the class method
# File lib/highline.rb, line 392 def color(*args) self.class.color(*args) end
Works as an instance method, same as the class method
# File lib/highline.rb, line 387 def color_code(*colors) self.class.color_code(*colors) end
Executes block or outputs statement with indentation
# File lib/highline.rb, line 671 def indent(increase=1, statement=nil, multiline=nil) @indent_level += increase multi = @multi_indent @multi_indent = multiline unless multiline.nil? if block_given? yield self else say(statement) end @multi_indent = multi @indent_level -= increase end
Outputs indentation with current settings
# File lib/highline.rb, line 664 def indentation return ' '*@indent_size*@indent_level end
This method is a utility for quickly and easily laying out lists. It can be accessed within ERb replacements of any text that will be sent to the user.
The only required parameter is items, which should be the Array of items to list. A specified mode controls how that list is formed and option has different effects, depending on the mode. Recognized modes are:
:columns_across |
items will be placed in columns, flowing from left to right. If given, option is the number of columns to be used. When absent, columns will be determined based on wrap_at or a default of 80 characters. |
:columns_down |
Identical to :columns_across, save flow goes down. |
:uneven_columns_across |
Like :columns_across but each column is sized independently. |
:uneven_columns_down |
Like :columns_down but each column is sized independently. |
:inline |
All items are placed on a single line. The last two items are separated by option or a default of " or ". All other items are separated by ", ". |
:rows |
The default mode. Each of the items is placed on its own line. The option parameter is ignored in this mode. |
Each member of the items Array is passed through ERb and thus can contain their own expansions. Color escape expansions do not contribute to the final field width.
# File lib/highline.rb, line 439 def list( items, mode = :rows, option = nil ) items = items.to_ary.map do |item| if item.nil? "" else ERB.new(item, nil, "%").result(binding) end end if items.empty? "" else case mode when :inline option = " or " if option.nil? if items.size == 1 items.first else items[0..-2].join(", ") + "#{option}#{items.last}" end when :columns_across, :columns_down max_length = actual_length( items.max { |a, b| actual_length(a) <=> actual_length(b) } ) if option.nil? limit = @wrap_at || 80 option = (limit + 2) / (max_length + 2) end items = items.map do |item| pad = max_length + (item.to_s.length - actual_length(item)) "%-#{pad}s" % item end row_count = (items.size / option.to_f).ceil if mode == :columns_across rows = Array.new(row_count) { Array.new } items.each_with_index do |item, index| rows[index / option] << item end rows.map { |row| row.join(" ") + "\n" }.join else columns = Array.new(option) { Array.new } items.each_with_index do |item, index| columns[index / row_count] << item end list = "" columns.first.size.times do |index| list << columns.map { |column| column[index] }. compact.join(" ") + "\n" end list end when :uneven_columns_across if option.nil? limit = @wrap_at || 80 items.size.downto(1) do |column_count| row_count = (items.size / column_count.to_f).ceil rows = Array.new(row_count) { Array.new } items.each_with_index do |item, index| rows[index / column_count] << item end widths = Array.new(column_count, 0) rows.each do |row| row.each_with_index do |field, column| size = actual_length(field) widths[column] = size if size > widths[column] end end if column_count == 1 or widths.inject(0) { |sum, n| sum + n + 2 } <= limit + 2 return rows.map { |row| row.zip(widths).map { |field, i| "%-#{i + (field.to_s.length - actual_length(field))}s" % field }.join(" ") + "\n" }.join end end else row_count = (items.size / option.to_f).ceil rows = Array.new(row_count) { Array.new } items.each_with_index do |item, index| rows[index / option] << item end widths = Array.new(option, 0) rows.each do |row| row.each_with_index do |field, column| size = actual_length(field) widths[column] = size if size > widths[column] end end return rows.map { |row| row.zip(widths).map { |field, i| "%-#{i + (field.to_s.length - actual_length(field))}s" % field }.join(" ") + "\n" }.join end when :uneven_columns_down if option.nil? limit = @wrap_at || 80 items.size.downto(1) do |column_count| row_count = (items.size / column_count.to_f).ceil columns = Array.new(column_count) { Array.new } items.each_with_index do |item, index| columns[index / row_count] << item end widths = Array.new(column_count, 0) columns.each_with_index do |column, i| column.each do |field| size = actual_length(field) widths[i] = size if size > widths[i] end end if column_count == 1 or widths.inject(0) { |sum, n| sum + n + 2 } <= limit + 2 list = "" columns.first.size.times do |index| list << columns.zip(widths).map { |column, width| field = column[index] "%-#{width + (field.to_s.length - actual_length(field))}s" % field }.compact.join(" ").strip + "\n" end return list end end else row_count = (items.size / option.to_f).ceil columns = Array.new(option) { Array.new } items.each_with_index do |item, index| columns[index / row_count] << item end widths = Array.new(option, 0) columns.each_with_index do |column, i| column.each do |field| size = actual_length(field) widths[i] = size if size > widths[i] end end list = "" columns.first.size.times do |index| list << columns.zip(widths).map { |column, width| field = column[index] "%-#{width + (field.to_s.length - actual_length(field))}s" % field }.compact.join(" ").strip + "\n" end return list end else items.map { |i| "#{i}\n" }.join end end end
Outputs newline
# File lib/highline.rb, line 687 def newline @output.puts end
Returns the number of columns for the console, or a default it they cannot be determined.
# File lib/highline.rb, line 695 def output_cols return 80 unless @output.tty? terminal_size.first rescue return 80 end
Returns the number of rows for the console, or a default if they cannot be determined.
# File lib/highline.rb, line 706 def output_rows return 24 unless @output.tty? terminal_size.last rescue return 24 end
Set to an integer value to cause HighLine to page output lines over the indicated line limit. When nil, the default, no paging occurs. If set to :auto, HighLine will attempt to determine the rows available for the @output or use a sensible default.
# File lib/highline.rb, line 657 def page_at=( setting ) @page_at = setting == :auto ? output_rows - 2 : setting end
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 parameter is processed as an ERb template, supporting embedded Ruby code. The template is evaluated with a binding inside the HighLine instance, providing easy access to the ANSI color constants and the HighLine.color() method.
# File lib/highline.rb, line 615 def say( statement ) statement = statement.to_str return unless statement.length > 0 # Allow non-ascii menu prompts in ruby > 1.9.2. ERB eval the menu statement # with the environment's default encoding(usually utf8) statement.force_encoding(Encoding.default_external) if defined?(Encoding) && Encoding.default_external template = ERB.new(statement, nil, "%") statement = template.result(binding) statement = wrap(statement) unless @wrap_at.nil? statement = page_print(statement) unless @page_at.nil? statement = statement.gsub(/\n(?!$)/,"\n#{indentation}") if @multi_indent # 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(indentation+statement) @output.flush else @output.puts(indentation+statement) end end
Works as an instance method, same as the class method
# File lib/highline.rb, line 402 def uncolor(string) self.class.uncolor(string) end
Set to an integer value to cause HighLine to wrap output lines at the indicated character limit. When nil, the default, no wrapping occurs. If set to :auto, HighLine will attempt to determine the columns available for the @output or use a sensible default.
# File lib/highline.rb, line 647 def wrap_at=( setting ) @wrap_at = setting == :auto ? output_cols : setting end
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