/
expander.rb
291 lines (262 loc) · 6.94 KB
/
expander.rb
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# frozen_string_literal: true
require_relative 'choices'
module TTY
class Prompt
# A class responsible for rendering expanding options
# Used by {Prompt} to display key options question.
#
# @api private
class Expander
HELP_CHOICE = {
key: 'h',
name: 'print help',
value: :help
}.freeze
# Create instance of Expander
#
# @api public
def initialize(prompt, options = {})
@prompt = prompt
@prefix = options.fetch(:prefix) { @prompt.prefix }
@default = options.fetch(:default) { 1 }
@active_color = options.fetch(:active_color) { @prompt.active_color }
@help_color = options.fetch(:help_color) { @prompt.help_color }
@choices = Choices.new
@selected = nil
@done = false
@status = :collapsed
@hint = nil
@default_key = false
end
def expanded?
@status == :expanded
end
def collapsed?
@status == :collapsed
end
def expand
@status = :expanded
end
# Respond to submit event
#
# @api public
def keyenter(_)
if @input.nil? || @input.empty?
@input = @choices[@default - 1].key
@default_key = true
end
selected = select_choice(@input)
if selected && selected.key.to_s == 'h'
expand
@selected = nil
@input = ''
elsif selected
@done = true
@selected = selected
else
@input = ''
end
end
alias keyreturn keyenter
# Respond to key press event
#
# @api public
def keypress(event)
if [:backspace, :delete].include?(event.key.name)
@input.chop! unless @input.empty?
elsif event.value =~ /^[^\e\n\r]/
@input += event.value
end
@selected = select_choice(@input)
if @selected && !@default_key && collapsed?
@hint = @selected.name
end
end
# Select choice by given key
#
# @return [Choice]
#
# @api private
def select_choice(key)
@choices.find_by(:key, key)
end
# Set default value.
#
# @api public
def default(value = (not_set = true))
return @default if not_set
@default = value
end
# Add a single choice
#
# @api public
def choice(value, &block)
if block
@choices << value.update(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)
values.each { |val| choice(val) }
end
# Execute this prompt
#
# @api public
def call(message, possibilities, &block)
choices(possibilities)
@message = message
block.call(self) if block
setup_defaults
choice(HELP_CHOICE)
@prompt.subscribe(self) do
render
end
end
private
# Create possible keys with current choice highlighted
#
# @return [String]
#
# @api private
def possible_keys
keys = @choices.pluck(:key)
default_key = keys[@default - 1]
if @selected
index = keys.index(@selected.key)
keys[index] = @prompt.decorate(keys[index], @active_color)
elsif @input.to_s.empty? && default_key
keys[@default - 1] = @prompt.decorate(default_key, @active_color)
end
keys.join(',')
end
# @api private
def render
@input = ''
until @done
question = render_question
@prompt.print(question)
read_input
@prompt.print(refresh(question.lines.count))
end
@prompt.print(render_question)
answer
end
# @api private
def answer
@selected.value
end
# Render message with options
#
# @return [String]
#
# @api private
def render_header
header = ["#{@prefix}#{@message} "]
if @done
selected_item = @selected.name.to_s
header << @prompt.decorate(selected_item, @active_color)
elsif collapsed?
header << %[(enter "h" for help) ]
header << "[#{possible_keys}] "
header << @input
end
header.join
end
# Show hint for selected option key
#
# return [String]
#
# @api private
def render_hint
"\n" + @prompt.decorate('>> ', @active_color) +
@hint +
@prompt.cursor.prev_line +
@prompt.cursor.forward(@prompt.strip(render_header).size)
end
# Render question with menu
#
# @return [String]
#
# @api private
def render_question
header = render_header
header << render_hint if @hint
header << "\n" if @done
if !@done && expanded?
header << render_menu
header << render_footer
end
header
end
def render_footer
" Choice [#{@choices[@default - 1].key}]: #{@input}"
end
def read_input
@prompt.read_keypress
end
# Refresh the current input
#
# @param [Integer] lines
#
# @return [String]
#
# @api private
def refresh(lines)
if @hint && (!@selected || @done)
@hint = nil
@prompt.clear_lines(lines, :down) +
@prompt.cursor.prev_line
elsif expanded?
@prompt.clear_lines(lines)
else
@prompt.clear_line
end
end
# Render help menu
#
# @api private
def render_menu
output = ["\n"]
@choices.each do |choice|
chosen = %(#{choice.key} - #{choice.name})
if @selected && @selected.key == choice.key
chosen = @prompt.decorate(chosen, @active_color)
end
output << ' ' + chosen + "\n"
end
output.join
end
def setup_defaults
validate_choices
end
def validate_choices
errors = []
keys = []
@choices.each do |choice|
if choice.key.nil?
errors << "Choice #{choice.name} is missing a :key attribute"
next
end
if choice.key.length != 1
errors << "Choice key `#{choice.key}` is more than one character long."
end
if choice.key.to_s == 'h'
errors << "Choice key `#{choice.key}` is reserved for help menu."
end
if keys.include?(choice.key)
errors << "Choice key `#{choice.key}` is a duplicate."
end
keys << choice.key if choice.key
end
errors.each { |err| raise ConfigurationError, err }
end
end # Expander
end # Prompt
end # TTY