Curses for Ruby

attr_sample.rb

#!/usr/bin/env ruby
# coding: utf-8

require 'curses'

Curses.init_screen

text = "TEXT"
attrs = {
  normal: Curses::A_NORMAL, 
  standout: Curses::A_STANDOUT,
  underline: Curses::A_UNDERLINE,
  reverse: Curses::A_REVERSE,
  blink: Curses::A_BLINK}

Curses.setpos(0, 0)
Curses.addstr('-' * 48)
Curses.setpos(1, 0)
Curses.addstr(sprintf("%-10s %-32s %s", "attribute", "value", "view"))
Curses.setpos(2, 0)
Curses.addstr('-' * 48)
attrs.each_with_index do |(name, attr), i|
  Curses.setpos(i + 3, 0)
  Curses.addstr(sprintf("%-10s %032b ", name.to_s, attr))
  Curses.attron(attr)
  Curses.addstr(text)
  Curses.attroff(attr)
end
Curses.setpos(attrs.size + 3, 0)
Curses.addstr('-' * 48)

Curses.refresh
Curses.getch

Curses.close_screen

bad_move_1.rb

#!/usr/bin/env ruby
# coding: utf-8

require 'curses'

Curses.init_screen
Curses.cbreak
Curses.stdscr.refresh

win = Curses::Window.new(5, 10, 0, 0)
win.setpos(2, 4)
win.addstr("Hi")
win.box('|', '-')

win.refresh
Curses.getch

win.move(2, 2)
win.refresh
Curses.getch

Curses.close_screen

bad_move_2.rb

#!/usr/bin/env ruby
# coding: utf-8

require 'curses'

Curses.init_screen
Curses.cbreak
Curses.stdscr.refresh

win = Curses::Window.new(5, 10, 0, 0)
win.setpos(2, 4)
win.addstr("Hi")
win.box('|', '-')

win.refresh
Curses.getch

Curses.stdscr.refresh
win.move(2, 2)
win.refresh
Curses.getch

Curses.close_screen

color_sample.rb

#!/usr/bin/env ruby
# coding: utf-8

require 'curses'
include Curses

init_screen
start_color
use_default_colors

setpos(0, 0)
if has_colors?
  addstr "Terminal has colors."
else
  addstr "Terminal does not have colors."
end

setpos(1, 0)
if can_change_color?
  addstr "Terminal can change color."
else
  addstr "Terminal can not change color."
end

lines = 2
rows = 6
p_idx = 0
colors.times do |fg_idx|
  setpos(lines + fg_idx, 0)
  attrset(A_NORMAL)
  addstr sprintf("fg_idx:%02d (%4d, %4d, %4d)", fg_idx, *color_content(fg_idx))

  colors.times do |bg_idx|
    attrset(A_NORMAL)
    addch " "
    init_pair(p_idx, fg_idx, bg_idx)
    attrset(color_pair(p_idx)|A_NORMAL)
    addstr "Hello" 
    p_idx = (p_idx + 1) % color_pairs
  end
end

refresh
getch

Curses.timeout = 0  # set non-blocking
bg_idx = pair_content(1).slice(1)
done = false
until(done)
  colors.times do |fg_idx|
    init_pair(1, fg_idx, bg_idx)
    refresh

    ch = getch
    unless ch.nil?
      done = true
      break
    end

    sleep 0.1
  end
end

close_screen

good_move.rb

#!/usr/bin/env ruby
# coding: utf-8

require 'curses'

Curses.init_screen
Curses.cbreak

screen = Curses.stdscr
screen.refresh

win = Curses::Window.new(5, 10, 0, 0)
win.setpos(2, 4)
win.addstr("Hi")
win.box('|', '-')

win.refresh
Curses.getch

screen.move(screen.begy, screen.begx)
screen.refresh
win.move(2, 2)
win.refresh
Curses.getch

Curses.close_screen

hello.rb

#!/usr/bin/env ruby
# coding: utf-8

require "curses"
include Curses

def show_message(message)
  width = message.length + 6
  win = Window.new(5, width, (lines - 5) / 2, (cols - width) / 2)
  win.box('|', '-')
  win.setpos(2, 3)
  win.addstr(message)
  win.refresh
  win.getch
  win.close
end

init_screen
begin
  crmode
#  show_message("Hit any key")
  setpos((lines - 5) / 2, (cols - 10) / 2)
  addstr("Hit any key")
  refresh
  getch
  show_message("Hello, World!")
  refresh
ensure
  close_screen
end

input_dialog.rb

#!/usr/bin/env ruby
# coding: utf-8

require 'curses'
require 'timeout'

class Curses::Window
  def touch
    self.move(self.begy, self.begx)
  end

  def touch_noutrefresh
    self.touch
    self.noutrefresh
  end
end

Curses.init_screen
Curses.cbreak

screen = Curses.stdscr

class << screen
  def show_message(message)
    self.setpos(0, 0)
    self.clrtoeol
    self.addstr(message)
  end
end

prompt_message = "Input any string!"
input_dialog = Curses::Window.new(
  4, prompt_message.size + 4,
  (Curses.lines - 4) / 2, (Curses.cols - prompt_message.size - 4) /2)
input_dialog.box('|', '-')
input_dialog.setpos(1, 2)
input_dialog.addstr(prompt_message)

class << input_dialog
  def get_input
    self.setpos(2, 2)
    Curses.echo
    Curses.curs_set(1)

    str = self.getstr
    if (str == "exit") || (str == "quit")
      str = nil
    else
      # clear input string.
      # (and recover box.)
      self.setpos(2, 2)
      self.clrtoeol
      self.box('|', '-')
    end

    Curses.noecho
    Curses.curs_set(0)
    return str
  end
end

# main loop

loop do
  screen.show_message("Input 'exit' or 'quit' to exit.")
  screen.touch_noutrefresh
  input_dialog.touch_noutrefresh
  Curses.doupdate

  input = input_dialog.get_input
  if input.nil?
    break
  end

  screen.show_message("Input 'q' to change string.")
  word_win = Curses::Window.new(
    1, input.size,
    0, (Curses.cols - input.size) / 2)
  word_win.addstr(input)

  line = 0
  speed = 0
  acc = 0.4
  rate = - 0.8
  done = false
  until(done)
    screen.touch_noutrefresh
    word_win.noutrefresh
    Curses.doupdate

    begin
      timeout(0.05) do
        ch = Curses.getch
        if ch == "q"
          done = true
        end
        sleep
      end
    rescue TimeoutError
      # ignore
    end

    line = (line + speed).ceil
    speed += acc
    if (line >= Curses.lines)
      line = Curses.lines - 1
      speed *= rate
    end

    word_win.move(line, word_win.begx)
  end

  word_win.close
end

Curses.close_screen

multi_window.rb

#!/usr/bin/env ruby
# coding: utf-8

require 'curses'

class Curses::Window
  # タッチ更新
  def touch
    self.move(self.begy, self.begx)
  end
end

Curses.init_screen
Curses.cbreak

screen = Curses.stdscr

message = "Hello"
windows = Array.new
10.times do |i|
  win = Curses::Window.new(3, 10, i+1, i+1)
  win.setpos(1, (10 - message.size) / 2)
  win.addstr(message)
  win.box('|', '-')
  windows.push win
end

# refresh

screen.setpos(0, 0)
screen.addstr("refresh")
screen.refresh
Curses.getch

windows.each do |win|
  win.refresh
  sleep 0.1
end
Curses.getch

# noutrefresh + doupdate

screen.clear
screen.setpos(0, 0)
screen.addstr("noutrefresh + doupdate")
screen.refresh
Curses.getch

windows.each do |win|
  win.touch
  win.noutrefresh
  sleep 0.1
end
Curses.doupdate
Curses.getch

windows.map(&:close)
Curses.close_screen