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commit cfff47e69cb6c6030b599048cd34fb739604edf8
parent 8c86c89bd2e6885e192bdc8164ed7bb8fd851df2
Author: Jake Bauer <jbauer@paritybit.ca>
Date:   Sat, 24 Sep 2022 16:00:10 -0400

Add script to convert between hex and 256 colors

Diffstat:
A.local/bin/convert_hex_xterm | 368+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 368 insertions(+), 0 deletions(-)

diff --git a/.local/bin/convert_hex_xterm b/.local/bin/convert_hex_xterm @@ -0,0 +1,368 @@ +#! /usr/bin/env python3 + +""" Convert values between RGB hex codes and xterm-256 color codes. + +Nice long listing of all 256 colors and their codes. Useful for +developing console color themes, or even script output schemes. + +Resources: +* http://en.wikipedia.org/wiki/8-bit_color +* http://en.wikipedia.org/wiki/ANSI_escape_code +* /usr/share/X11/rgb.txt + +Credit goes to Micah Elliott - http://MicahElliott.com +--- +Script found at: https://gist.github.com/chrisdiana/c71f224626b5b9516bdb +Python 3 conversion and code improvements by Jake Bauer <jbauer@paritybit.ca> +""" + +import sys, re + +# Color Look-Up Table +# (8-bit, RGB hex) +CLUT = [ + # 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'), + + # Gray-scale range. + ('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'), +] + +def _create_dicts(): + short2rgb_dict = dict(CLUT) + rgb2short_dict = {} + for k, v in short2rgb_dict.items(): + rgb2short_dict[v] = k + return rgb2short_dict, short2rgb_dict + +def short2rgb(short): + return SHORT2RGB_DICT[short] + +def print_all(): + for short, rgb in CLUT: + sys.stdout.write('\033[48;5;%sm%s:%s' % (short, short, rgb)) + sys.stdout.write("\033[0m ") + sys.stdout.write('\033[38;5;%sm%s:%s' % (short, short, rgb)) + sys.stdout.write("\033[0m\n") + print("Printed all codes.") + print("You can translate a hex or 0-255 code by providing an argument.") + +# Find the closest xterm-256 approximation to the given RGB value. +def rgb2short(rgb): + increments = (0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff) + + # Break the 6-char RGB code into 3 integer values. + parts = [ int(h, 16) for h in re.split(r'(..)(..)(..)', rgb)[1:4] ] + result = [] + for part in parts: + i = 0 + while i < len(increments)-1: + smaller, bigger = increments[i], increments[i+1] + if smaller <= part <= bigger: + smaller1 = abs(smaller - part) + bigger1 = abs(bigger - part) + if smaller1 < bigger1: + closest = smaller + else: + closest = bigger + result.append(closest) + break + i += 1 + result = ''.join([ ('%02.x' % i) for i in result ]) + equivalent = RGB2SHORT_DICT[ result ] + return equivalent, result + +RGB2SHORT_DICT, SHORT2RGB_DICT = _create_dicts() + +if __name__ == '__main__': + if len(sys.argv) == 1: + print_all() + sys.exit(0) + + allowed_chars = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', + 'a', 'b', 'c', 'd', 'e', 'f', '#'] + arg = sys.argv[1] + + # Check for invalid characters + for char in arg: + if char not in allowed_chars: + print("Invalid character:", char) + print("Please input a valid 256-colour or hex code.") + sys.exit(1) + + # Remove leading '#' + if arg.startswith('#'): + arg = arg.lstrip('#') + + # 256-colour to hex + if len(arg) < 4 and int(arg) < 256: + rgb = short2rgb(arg) + sys.stdout.write('xterm color \033[38;5;%sm%s\033[0m -> RGB exact \033[38;5;%sm%s\033[0m' % (arg, arg, arg, rgb)) + sys.stdout.write("\033[0m\n") + + # Hex to 256-colour + else: + # Convert an RGB value like f20 to ff2200 + if len(arg) < 4: + arg = arg[0]*2 + arg[1]*2 + arg[2]*2 + short, rgb = rgb2short(arg) + sys.stdout.write('RGB %s -> xterm color approx \033[38;5;%sm%s (%s)' % (arg, short, short, rgb)) + sys.stdout.write("\033[0m\n")