/
enum_list.rb
378 lines (339 loc) · 9.5 KB
/
enum_list.rb
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# frozen_string_literal: true
require 'English'
require_relative 'choices'
require_relative 'enum_paginator'
require_relative 'paginator'
require_relative 'symbols'
module TTY
class Prompt
# A class reponsible for rendering enumerated list menu.
# Used by {Prompt} to display static choice menu.
#
# @api private
class EnumList
include Symbols
PAGE_HELP = '(Press tab/right or left to reveal more choices)'
# Create instance of EnumList menu.
#
# @api public
def initialize(prompt, options = {})
@prompt = prompt
@prefix = options.fetch(:prefix) { @prompt.prefix }
@enum = options.fetch(:enum) { ')' }
@default = options.fetch(:default) { 1 }
@active_color = options.fetch(:active_color) { @prompt.active_color }
@help_color = options.fetch(:help_color) { @prompt.help_color }
@error_color = options.fetch(:error_color) { @prompt.error_color }
@cycle = options.fetch(:cycle) { false }
@input = nil
@done = false
@first_render = true
@failure = false
@active = @default
@choices = Choices.new
@per_page = options[:per_page]
@page_help = options[:page_help] || PAGE_HELP
@paginator = EnumPaginator.new
@page_active = @default
end
# Set default option selected
#
# @api public
def default(default)
@default = default
end
# Set number of items per page
#
# @api public
def per_page(value)
@per_page = value
end
def page_size
(@per_page || Paginator::DEFAULT_PAGE_SIZE)
end
# Check if list is paginated
#
# @return [Boolean]
#
# @api private
def paginated?
@choices.size > page_size
end
# @param [String] text
# the help text to display per page
# @api pbulic
def page_help(text)
@page_help = text
end
# Set selecting active index using number pad
#
# @api public
def enum(value)
@enum = value
end
# Add a single choice
#
# @api public
def choice(*value, &block)
if block
@choices << (value << block)
else
@choices << value
end
end
# Add multiple choices
#
# @param [Array[Object]] values
# the values to add as choices
#
# @api public
def choices(values = (not_set = true))
if not_set
@choices
else
values.each { |val| @choices << val }
end
end
# Call the list menu by passing question and choices
#
# @param [String] question
#
# @param
# @api public
def call(question, possibilities, &block)
choices(possibilities)
@question = question
block[self] if block
setup_defaults
@prompt.subscribe(self) do
render
end
end
def keypress(event)
if [:backspace, :delete].include?(event.key.name)
return if @input.empty?
@input.chop!
mark_choice_as_active
elsif event.value =~ /^\d+$/
@input += event.value
mark_choice_as_active
end
end
def keyreturn(*)
@failure = false
num = @input.to_i
choice_disabled = choices[num - 1] && choices[num - 1].disabled?
choice_in_range = num > 0 && num <= @choices.size
if choice_in_range && !choice_disabled || @input.empty?
@done = true
else
@input = ''
@failure = true
end
end
alias keyenter keyreturn
def keyright(*)
if (@page_active + page_size) <= @choices.size
@page_active += page_size
elsif @cycle
@page_active = 1
end
end
alias keytab keyright
def keyleft(*)
if (@page_active - page_size) >= 0
@page_active -= page_size
elsif @cycle
@page_active = @choices.size - 1
end
end
private
# Find active choice or set to default
#
# @return [nil]
#
# @api private
def mark_choice_as_active
next_active = @choices[@input.to_i - 1]
if next_active && next_active.disabled?
# noop
elsif (@input.to_i > 0) && next_active
@active = @input.to_i
else
@active = @default
end
@page_active = @active
end
# Validate default indexes to be within range
#
# @api private
def validate_defaults
msg = if @default.nil? || @default.to_s.empty?
"default index must be an integer in range (1 - #{choices.size})"
elsif @default < 1 || @default > @choices.size
"default index #{@default} out of range (1 - #{@choices.size})"
elsif choices[@default - 1] && choices[@default - 1].disabled?
"default index #{@default} matches disabled choice item"
end
raise(ConfigurationError, msg) if msg
end
# Setup default option and active selection
#
# @api private
def setup_defaults
validate_defaults
mark_choice_as_active
end
# Render a selection list.
#
# By default the result is printed out.
#
# @return [Object] value
# return the selected value
#
# @api private
def render
@input = ''
until @done
question = render_question
@prompt.print(question)
@prompt.print(render_error) if @failure
if paginated? && !@done
@prompt.print(render_page_help)
end
@prompt.read_keypress
question_lines = question.split($INPUT_RECORD_SEPARATOR, -1)
@prompt.print(refresh(question_lines_count(question_lines)))
end
@prompt.print(render_question)
answer
end
# Count how many screen lines the question spans
#
# @return [Integer]
#
# @api private
def question_lines_count(question_lines)
question_lines.reduce(0) do |acc, line|
acc + @prompt.count_screen_lines(line)
end
end
# Find value for the choice selected
#
# @return [nil, Object]
#
# @api private
def answer
@choices[@active - 1].value
end
# Determine area of the screen to clear
#
# @param [Integer] lines
# the lines to clear
#
# @return [String]
#
# @api private
def refresh(lines)
@prompt.clear_lines(lines) +
@prompt.cursor.clear_screen_down
end
# Render question with the menu options
#
# @return [String]
#
# @api private
def render_question
header = ["#{@prefix}#{@question} #{render_header}\n"]
unless @done
header << render_menu
header << render_footer
end
header.join
end
# Error message when incorrect index chosen
#
# @api private
def error_message
error = 'Please enter a valid number'
"\n" + @prompt.decorate('>>', @error_color) + ' ' + error
end
# Render error message and return cursor to position of input
#
# @return [String]
#
# @api private
def render_error
error = error_message.dup
if !paginated?
error << @prompt.cursor.prev_line
error << @prompt.cursor.forward(render_footer.size)
end
error
end
# Render chosen option
#
# @return [String]
#
# @api private
def render_header
return '' unless @done
return '' unless @active
selected_item = @choices[@active - 1].name.to_s
@prompt.decorate(selected_item, @active_color)
end
# Render footer for the indexed menu
#
# @return [String]
#
# @api private
def render_footer
" Choose 1-#{@choices.size} [#{@default}]: #{@input}"
end
# Pagination help message
#
# @return [String]
#
# @api private
def page_help_message
return '' unless paginated?
"\n" + @prompt.decorate(@page_help, @help_color)
end
# Render page help
#
# @return [String]
#
# @api private
def render_page_help
help = page_help_message.dup
if @failure
help << @prompt.cursor.prev_line
end
help << @prompt.cursor.prev_line
help << @prompt.cursor.forward(render_footer.size)
end
# Render menu with indexed choices to select from
#
# @return [String]
#
# @api private
def render_menu
output = []
@paginator.paginate(@choices, @page_active, @per_page) do |choice, index|
num = (index + 1).to_s + @enum + ' '
selected = num + choice.name
output << if index + 1 == @active && !choice.disabled?
(' ' * 2) + @prompt.decorate(selected, @active_color)
elsif choice.disabled?
@prompt.decorate(symbols[:cross], :red) + ' ' +
selected + ' ' + choice.disabled.to_s
else
(' ' * 2) + selected
end
output << "\n"
end
output.join
end
end # EnumList
end # Prompt
end # TTY