ansi.rb

module ANSI
  class << self
    ESC = "\x1B"
    CSI = ESC + "["

    def cursor_up(n = 1)
      "#{CSI}#{n}A"
    end

    def cursor_down(n = 1)
      "#{CSI}#{n}B"
    end

    def cursor_forward(n = 1)
      "#{CSI}#{n}C"
    end

    def cursor_back(n = 1)
      "#{CSI}#{n}D"
    end

    def curosr_next_line(n = 1)
      "#{CSI}#{n}E"
    end

    def cursor_previous_line(n = 1)
      "#{CSI}#{n}F"
    end

    def cursor_horizontal_absolute(n = 1)
      "#{CSI}#{n}G"
    end

    def cursor_position(r = 0, c = 0)
      "#{CSI}#{r+1};#{c+1}H"
    end

    def erase_display(n = 2)
      "#{CSI}#{n}J"
    end

    def erase_display_up
      erase_display(1)
    end

    def erase_scrollback_buffer
      erase_display(3)
    end

    def erase_line(n = 2)
      "#{CSI}#{n}K"
    end

    def erase_line_end
      erase_line(0)
    end

    def erase_line_beginning
      erase_line(1)
    end

    def scroll_up(n = 1)
      "#{CSI}#{n}S"
    end

    def scroll_down(n = 1)
      "#{CSI}#{n}T"
    end

    def select_graphics_rendition(n = 0)
      "#{CSI}#{n}m"
    end
    alias_method :sgr, :select_graphics_rendition

    def reset; sgr(0) end
    def bold; sgr(1) end
    def faint; sgr(2) end
    def italic; sgr(3) end
    def underline; sgr(4) end
    def slow_blink; sgr(5) end
    def rapid_blink; sgr(6) end
    def inverse; sgr(7) end
    def crossed_out; sgr(9) end
    def default_font; sgr(10) end
    def alternate_font; sgr(11) end
    def bold_off; sgr(21) end
    def normal; sgr(22) end
    def italic_off; sgr(23) end
    def underline_off; sgr(24) end
    def blink_off; sgr(25) end
    def inverse_off; sgr(27) end
    def crossed_out_off; sgr(29) end
    def default_fg; sgr(39) end
    def default_bg; sgr(49) end
    def fg_black; sgr(30) end
    def bg_black; sgr(40) end
    def fg_red; sgr(31) end
    def bg_red; sgr(41) end
    def fg_green; sgr(32) end
    def bg_green; sgr(42) end
    def fg_yellow; sgr(33) end
    def bg_yellow; sgr(43) end
    def fg_blue; sgr(34) end
    def bg_blue; sgr(44) end
    def fg_magenta; sgr(35) end
    def bg_magenta; sgr(45) end
    def fg_cyan; sgr(36) end
    def bg_cyan; sgr(46) end
    def fg_white; sgr(37) end
    def bg_white; sgr(47) end
    def fg_bright_black; sgr(90) end
    def bg_bright_black; sgr(100) end
    def fg_bright_red; sgr(91) end
    def bg_bright_red; sgr(101) end
    def fg_bright_green; sgr(92) end
    def bg_bright_green; sgr(102) end
    def fg_bright_yellow; sgr(93) end
    def bg_bright_yellow; sgr(103) end
    def fg_bright_blue; sgr(94) end
    def bg_bright_blue; sgr(104) end
    def fg_bright_magenta; sgr(95) end
    def bg_bright_magenta; sgr(105) end
    def fg_bright_cyan; sgr(96) end
    def bg_bright_cyan; sgr(106) end
    def fg_bright_white; sgr(97) end
    def bg_bright_white; sgr(107) end

    def save_cursor_position
      "#{CSI}s"
    end

    def restore_cursor_position
      "#{CSI}u"
    end

    def show_cursor
      "#{CSI}?25h"
    end

    def hide_cursor
      "#{CSI}?25l"
    end

    def enable_screen_buffer
      "#{CSI}?1049h"
    end

    def disable_screen_buffer
      "#{CSI}?1049l"
    end

    def enable_bracketed_paste
      "#{CSI}?2004h"
    end

    def disable_bracketed_paste
      "#{CSI}?2004l"
    end

    def fg_8bit(n)
      "#{CSI}38;5;#{n}m"
    end

    def bg_8bit(n)
      "#{CSI}48;5;#{n}m"
    end

    def fg_rgb(r, g, b)
      "#{CSI}38;2;#{r};#{g};#{b}m"
    end

    def bg_rgb(r, g, b)
      "#{CSI}48;2;#{r};#{g};#{b}m"
    end
  end
end