Module: Keisanjaku::ANSI

Defined in:
lib/keisanjaku/ansi.rb

Constant Summary collapse

CODES = 
{
  reset: 0,
  red: 31,
  yellow: 33,
  cyan_bg: 46,
  bold: 1
}.freeze
AMBIGUOUS_WIDE_CHARS = 
"×÷±−√°·".chars.freeze

Class Method Summary collapse

Class Method Details

.clear_screen ⇒ Object 



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# File 'lib/keisanjaku/ansi.rb', line 25

def clear_screen
  "\e[2J\e[H"
end

.enabled?(color) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/keisanjaku/ansi.rb', line 14

def enabled?(color)
  color && ENV["NO_COLOR"].nil?
end

.fit(text, width) ⇒ Object 



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# File 'lib/keisanjaku/ansi.rb', line 45

def fit(text, width)
  stripped_width = visible_width(text)
  return text + (" " * (width - stripped_width)) if stripped_width < width
  return text if stripped_width == width

  truncate(text, width)
end

.hide_cursor ⇒ Object 



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# File 'lib/keisanjaku/ansi.rb', line 29

def hide_cursor
  "\e[?25l"
end

.paint(text, *styles, color: true) ⇒ Object 



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# File 'lib/keisanjaku/ansi.rb', line 18

def paint(text, *styles, color: true)
  return text unless enabled?(color)

  codes = styles.map { |style| CODES.fetch(style) }.join(";")
  "\e[#{codes}m#{text}\e[0m"
end

.show_cursor ⇒ Object 



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# File 'lib/keisanjaku/ansi.rb', line 33

def show_cursor
  "\e[?25h"
end

.strip(text) ⇒ Object 



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# File 'lib/keisanjaku/ansi.rb', line 37

def strip(text)
  text.gsub(/\e\[[0-9;?]*[A-Za-z]/, "")
end

.truncate(text, width) ⇒ Object 



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# File 'lib/keisanjaku/ansi.rb', line 53

def truncate(text, width)
  output = +""
  used = 0
  strip(text).each_char do |char|
    char_width = wide?(char) ? 2 : 1
    break if used + char_width > width

    output << char
    used += char_width
  end
  output << (" " * (width - used))
end

.visible_width(text) ⇒ Object 



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# File 'lib/keisanjaku/ansi.rb', line 41

def visible_width(text)
  strip(text).each_char.sum { |char| wide?(char) ? 2 : 1 }
end

.wide?(char) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/keisanjaku/ansi.rb', line 66

def wide?(char)
  code = char.ord
  (0x1100..0x115F).cover?(code) ||
    (0x2E80..0xA4CF).cover?(code) ||
    (0xAC00..0xD7A3).cover?(code) ||
    (0xF900..0xFAFF).cover?(code) ||
    (0xFE10..0xFE19).cover?(code) ||
  (0xFE30..0xFE6F).cover?(code) ||
    (0xFF00..0xFF60).cover?(code) ||
    (0xFFE0..0xFFE6).cover?(code) ||
    AMBIGUOUS_WIDE_CHARS.include?(char)
end