Module: Shellfie::AnsiColors

Defined in:
lib/shellfie/ansi_colors.rb

Constant Summary collapse

COLORS = 
{
  30 => :black,
  31 => :red,
  32 => :green,
  33 => :yellow,
  34 => :blue,
  35 => :magenta,
  36 => :cyan,
  37 => :white,
  90 => :bright_black,
  91 => :bright_red,
  92 => :bright_green,
  93 => :bright_yellow,
  94 => :bright_blue,
  95 => :bright_magenta,
  96 => :bright_cyan,
  97 => :bright_white
}.freeze
BG_COLORS = 
{
  40 => :black,
  41 => :red,
  42 => :green,
  43 => :yellow,
  44 => :blue,
  45 => :magenta,
  46 => :cyan,
  47 => :white,
  100 => :bright_black,
  101 => :bright_red,
  102 => :bright_green,
  103 => :bright_yellow,
  104 => :bright_blue,
  105 => :bright_magenta,
  106 => :bright_cyan,
  107 => :bright_white
}.freeze
XTERM_COLOR_STEPS = 
[0, 95, 135, 175, 215, 255].freeze

Class Method Summary collapse

Class Method Details

.color_256(index) ⇒ Object 



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# File 'lib/shellfie/ansi_colors.rb', line 66

def color_256(index)
  return nil unless index.is_a?(Integer) && index.between?(0, 255)

  if index < 16
    standard_colors[index]
  elsif index < 232
    color_cube(index - 16)
  else
    gray = (index - 232) * 10 + 8
    format("#%02x%02x%02x", gray, gray, gray)
  end
end

.color_cube(index) ⇒ Object 



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# File 'lib/shellfie/ansi_colors.rb', line 87

def color_cube(index)
  r = XTERM_COLOR_STEPS[index / 36]
  g = XTERM_COLOR_STEPS[(index % 36) / 6]
  b = XTERM_COLOR_STEPS[index % 6]
  format("#%02x%02x%02x", r, g, b)
end

.parse_extended_color(codes, index) ⇒ Object 



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# File 'lib/shellfie/ansi_colors.rb', line 47

def parse_extended_color(codes, index)
  return [index, nil] if codes[index + 1].nil?

  case codes[index + 1]
  when 5
    color_index = codes[index + 2]
    return [index, nil] unless color_index

    [index + 2, color_256(color_index)]
  when 2
    rgb = codes.values_at(index + 2, index + 3, index + 4)
    return [index, nil] unless rgb.all? { |value| value.is_a?(Integer) && value.between?(0, 255) }

    [index + 4, format("#%02x%02x%02x", *rgb)]
  else
    [index, nil]
  end
end

.standard_colors ⇒ Object 



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# File 'lib/shellfie/ansi_colors.rb', line 79

def standard_colors
  %i[
    black red green yellow blue magenta cyan white
    bright_black bright_red bright_green bright_yellow
    bright_blue bright_magenta bright_cyan bright_white
  ]
end