Class: VimColorScheme::Hex2Term

Inherits:
Object
  • Object
show all
Defined in:
lib/vimcolorscheme/hex2term.rb

Constant Summary collapse

SCLUT =

This colour lookup table is taken from the following gist: gist.github.com/719710

{
  # Primary 3-bit (8 colors). Unique representation!
  '00' => '000000',
  '01' => '800000',
  '02' => '008000',
  '03' => '808000',
  '04' => '000080',
  '05' => '800080',
  '06' => '008080',
  '07' => 'c0c0c0',

  # Equivalent "bright" versions of original 8 colors.
  '08' => '808080',
  '09' => 'ff0000',
  '10' => '00ff00',
  '11' => 'ffff00',
  '12' => '0000ff',
  '13' => 'ff00ff',
  '14' => '00ffff',
  '15' => 'ffffff',

  # Strictly ascending.
  '16' => '000000',
  '17' => '00005f',
  '18' => '000087',
  '19' => '0000af',
  '20' => '0000d7',
  '21' => '0000ff',
  '22' => '005f00',
  '23' => '005f5f',
  '24' => '005f87',
  '25' => '005faf',
  '26' => '005fd7',
  '27' => '005fff',
  '28' => '008700',
  '29' => '00875f',
  '30' => '008787',
  '31' => '0087af',
  '32' => '0087d7',
  '33' => '0087ff',
  '34' => '00af00',
  '35' => '00af5f',
  '36' => '00af87',
  '37' => '00afaf',
  '38' => '00afd7',
  '39' => '00afff',
  '40' => '00d700',
  '41' => '00d75f',
  '42' => '00d787',
  '43' => '00d7af',
  '44' => '00d7d7',
  '45' => '00d7ff',
  '46' => '00ff00',
  '47' => '00ff5f',
  '48' => '00ff87',
  '49' => '00ffaf',
  '50' => '00ffd7',
  '51' => '00ffff',
  '52' => '5f0000',
  '53' => '5f005f',
  '54' => '5f0087',
  '55' => '5f00af',
  '56' => '5f00d7',
  '57' => '5f00ff',
  '58' => '5f5f00',
  '59' => '5f5f5f',
  '60' => '5f5f87',
  '61' => '5f5faf',
  '62' => '5f5fd7',
  '63' => '5f5fff',
  '64' => '5f8700',
  '65' => '5f875f',
  '66' => '5f8787',
  '67' => '5f87af',
  '68' => '5f87d7',
  '69' => '5f87ff',
  '70' => '5faf00',
  '71' => '5faf5f',
  '72' => '5faf87',
  '73' => '5fafaf',
  '74' => '5fafd7',
  '75' => '5fafff',
  '76' => '5fd700',
  '77' => '5fd75f',
  '78' => '5fd787',
  '79' => '5fd7af',
  '80' => '5fd7d7',
  '81' => '5fd7ff',
  '82' => '5fff00',
  '83' => '5fff5f',
  '84' => '5fff87',
  '85' => '5fffaf',
  '86' => '5fffd7',
  '87' => '5fffff',
  '88' => '870000',
  '89' => '87005f',
  '90' => '870087',
  '91' => '8700af',
  '92' => '8700d7',
  '93' => '8700ff',
  '94' => '875f00',
  '95' => '875f5f',
  '96' => '875f87',
  '97' => '875faf',
  '98' => '875fd7',
  '99' => '875fff',
  '100' => '878700',
  '101' => '87875f',
  '102' => '878787',
  '103' => '8787af',
  '104' => '8787d7',
  '105' => '8787ff',
  '106' => '87af00',
  '107' => '87af5f',
  '108' => '87af87',
  '109' => '87afaf',
  '110' => '87afd7',
  '111' => '87afff',
  '112' => '87d700',
  '113' => '87d75f',
  '114' => '87d787',
  '115' => '87d7af',
  '116' => '87d7d7',
  '117' => '87d7ff',
  '118' => '87ff00',
  '119' => '87ff5f',
  '120' => '87ff87',
  '121' => '87ffaf',
  '122' => '87ffd7',
  '123' => '87ffff',
  '124' => 'af0000',
  '125' => 'af005f',
  '126' => 'af0087',
  '127' => 'af00af',
  '128' => 'af00d7',
  '129' => 'af00ff',
  '130' => 'af5f00',
  '131' => 'af5f5f',
  '132' => 'af5f87',
  '133' => 'af5faf',
  '134' => 'af5fd7',
  '135' => 'af5fff',
  '136' => 'af8700',
  '137' => 'af875f',
  '138' => 'af8787',
  '139' => 'af87af',
  '140' => 'af87d7',
  '141' => 'af87ff',
  '142' => 'afaf00',
  '143' => 'afaf5f',
  '144' => 'afaf87',
  '145' => 'afafaf',
  '146' => 'afafd7',
  '147' => 'afafff',
  '148' => 'afd700',
  '149' => 'afd75f',
  '150' => 'afd787',
  '151' => 'afd7af',
  '152' => 'afd7d7',
  '153' => 'afd7ff',
  '154' => 'afff00',
  '155' => 'afff5f',
  '156' => 'afff87',
  '157' => 'afffaf',
  '158' => 'afffd7',
  '159' => 'afffff',
  '160' => 'd70000',
  '161' => 'd7005f',
  '162' => 'd70087',
  '163' => 'd700af',
  '164' => 'd700d7',
  '165' => 'd700ff',
  '166' => 'd75f00',
  '167' => 'd75f5f',
  '168' => 'd75f87',
  '169' => 'd75faf',
  '170' => 'd75fd7',
  '171' => 'd75fff',
  '172' => 'd78700',
  '173' => 'd7875f',
  '174' => 'd78787',
  '175' => 'd787af',
  '176' => 'd787d7',
  '177' => 'd787ff',
  '178' => 'd7af00',
  '179' => 'd7af5f',
  '180' => 'd7af87',
  '181' => 'd7afaf',
  '182' => 'd7afd7',
  '183' => 'd7afff',
  '184' => 'd7d700',
  '185' => 'd7d75f',
  '186' => 'd7d787',
  '187' => 'd7d7af',
  '188' => 'd7d7d7',
  '189' => 'd7d7ff',
  '190' => 'd7ff00',
  '191' => 'd7ff5f',
  '192' => 'd7ff87',
  '193' => 'd7ffaf',
  '194' => 'd7ffd7',
  '195' => 'd7ffff',
  '196' => 'ff0000',
  '197' => 'ff005f',
  '198' => 'ff0087',
  '199' => 'ff00af',
  '200' => 'ff00d7',
  '201' => 'ff00ff',
  '202' => 'ff5f00',
  '203' => 'ff5f5f',
  '204' => 'ff5f87',
  '205' => 'ff5faf',
  '206' => 'ff5fd7',
  '207' => 'ff5fff',
  '208' => 'ff8700',
  '209' => 'ff875f',
  '210' => 'ff8787',
  '211' => 'ff87af',
  '212' => 'ff87d7',
  '213' => 'ff87ff',
  '214' => 'ffaf00',
  '215' => 'ffaf5f',
  '216' => 'ffaf87',
  '217' => 'ffafaf',
  '218' => 'ffafd7',
  '219' => 'ffafff',
  '220' => 'ffd700',
  '221' => 'ffd75f',
  '222' => 'ffd787',
  '223' => 'ffd7af',
  '224' => 'ffd7d7',
  '225' => 'ffd7ff',
  '226' => 'ffff00',
  '227' => 'ffff5f',
  '228' => 'ffff87',
  '229' => 'ffffaf',
  '230' => 'ffffd7',
  '231' => 'ffffff',

  # Gr' => scale rang.
  '232' => '080808',
  '233' => '121212',
  '234' => '1c1c1c',
  '235' => '262626',
  '236' => '303030',
  '237' => '3a3a3a',
  '238' => '444444',
  '239' => '4e4e4e',
  '240' => '585858',
  '241' => '626262',
  '242' => '6c6c6c',
  '243' => '767676',
  '244' => '808080',
  '245' => '8a8a8a',
  '246' => '949494',
  '247' => '9e9e9e',
  '248' => 'a8a8a8',
  '249' => 'b2b2b2',
  '250' => 'bcbcbc',
  '251' => 'c6c6c6',
  '252' => 'd0d0d0',
  '253' => 'dadada',
  '254' => 'e4e4e4',
  '255' => 'eeeeee',
}
HCLUT =

Hex color lookup table. Essentially this is exactly the same as the short color lookup table but inverted. So k => v becomes v => k.

SCLUT.invert

Class Method Summary collapse

Class Method Details

.convert(value) ⇒ Object

Takes either a short color value or a hexidecimal color value and converts it to the other format respectively.

Example:

convert(23)
# => '005f5f'

convert('#ffffff')
# => '231'



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# File 'lib/vimcolorscheme/hex2term.rb', line 285

def self.convert value
  if value.to_s.length < 4 and value.to_s.to_i < 256
    short2rb(value)
  else
    rgb2short(value)
  end
end

.rgb2short(rgb) ⇒ Object

Takes an RGB hex value, with or without the leading hash, and converts it into one of 256 color values used by terminals.

The method for doing it was borrowed with lots of love from this gist: gist.github.com/719710

Example:

rgb2short('#ffffff')
# => '231'



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# File 'lib/vimcolorscheme/hex2term.rb', line 314

def self.rgb2short rgb
  rgb   = strip_hash(rgb)
  incs  = [0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff]
  parts = rgb.split(/(..)(..)(..)/).map { |part| part.to_i(16) }
  res   = []

  # The above split will have an empty string at the start, this gets rid of
  # it
  parts.shift

  parts.each do |part|
    incs.each_cons(2) do |s, b|
      if s <= part and part <= b
        s1 = (s - part).abs
        b1 = (b - part).abs

        if s1 < b1
          closest = s
        else
          closest = b
        end

        res << closest
        break
      end
    end
  end

  key = res.map { |part| part.to_s(16).center(2, '0') }.join
  HCLUT[key]
end

.short2rb(short) ⇒ Object

Takes a short color value (e.g. between 0 and 255) and returns the hexadecimal equivalent with a leading hash.

Example:

short2rb(231)
# => '#ffffff'



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# File 'lib/vimcolorscheme/hex2term.rb', line 300

def self.short2rb short
  '#' + SCLUT[short.to_s]
end

.strip_hash(hex) ⇒ Object

Takes a string that may or may not have a hash at the start and returns a string that does not have a hash at the start.

Example:

strip_hash('#ffffff')
# => 'ffffff'



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# File 'lib/vimcolorscheme/hex2term.rb', line 353

def self.strip_hash hex
  hex.delete '#'
end