175 lines
3 KiB
Ruby
175 lines
3 KiB
Ruby
# frozen_string_literal: true
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require 'thread'
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require 'curses'
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class Main
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def self.inherited(_base)
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raise "#{self} is final"
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end
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def self.mutex
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(@mutex ||= Mutex.new).tap { freeze }
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end
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def initialize
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raise "#{self.class} is singleton" unless self.class.mutex.try_lock
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call
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end
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private
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def call
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before_loop
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loop do
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before_iteration
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sleep
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after_iteration
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end
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after_loop
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end
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def sleep
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super 0.01
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end
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def before_loop
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Curses.init_screen
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Curses.start_color
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Curses.noecho # do no echo input
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Curses.curs_set 0 # invisible cursor
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Curses.timeout = 0 # non-blocking input
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Curses.stdscr.keypad = true
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Curses.init_pair 1, Curses::COLOR_WHITE, Curses::COLOR_BLACK
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Curses.init_pair 2, Curses::COLOR_BLACK, Curses::COLOR_WHITE
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Curses.init_pair 3, Curses::COLOR_BLUE, Curses::COLOR_BLACK
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initials
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end
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def after_loop
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Curses.close_screen
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end
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def before_iteration
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render
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end
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def after_iteration
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loop do
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event = Curses.getch
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break if event.nil?
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handle event
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end
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end
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def initials
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@search = Search.new 1, 1, Curses.stdscr.maxx - 2, 1
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@list = List.new(
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1, 2,
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Curses.stdscr.maxx - 2, Curses.stdscr.maxy - 3,
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1.upto(Curses.stdscr.maxy - 1 + 10).map do
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['Qwe'].*(3 * (1 + rand(10))).join(' ')
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end
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)
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end
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def handle(event)
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case event
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when /[a-zA-Z0-9 _-]/
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@search.append event
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when Curses::Key::BACKSPACE
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@search.backspace
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when Curses::Key::UP
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@list.up
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when Curses::Key::DOWN
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@list.down
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end
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end
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def render
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Curses.clear
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@search.render
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@list.render
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Curses.refresh
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end
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end
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class Search
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attr_reader :x, :y, :width, :height, :text
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def initialize(x, y, width, height)
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@x = x
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@y = y
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@width = width
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@height = height
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@text = ''
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end
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def render
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Curses.attron Curses.color_pair 3
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Curses.setpos x, y
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Curses.addstr text
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end
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def append(c)
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@text += c
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end
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def backspace
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@text = text[0...-1]
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end
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end
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class List
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attr_reader :x, :y, :width, :height, :active, :top, :items
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def initialize(x, y, width, height, items)
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@x = x
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@y = y
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@width = width
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@height = height
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@active = 0
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@top = 0
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@items = Array(items)
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end
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def render
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items[top...(top + height)].each_with_index.each do |item, offset|
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index = top + offset
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if index == active
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Curses.attron Curses.color_pair 2
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else
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Curses.attron Curses.color_pair 1
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end
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Curses.setpos y + offset, x
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Curses.addstr "#{index}: #{item}".ljust width
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end
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end
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def up
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@active -= 1
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@active = items.count - 1 if active.negative?
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update
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end
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def down
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@active += 1
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@active = 0 if active >= items.count
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update
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end
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def update
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if active < top
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@top = active
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elsif active >= top + height
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@top = active - height + 1
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end
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end
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end
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