node.js - What is this \u001b[9... syntax of choosing what color text appears on console, and how can I add more colors? -


i messing around debug , colors.js more colors limited 4-6 colors i'm stuck @ figuring out coloring syntax

args[0] = ' \u001b[9' + c + 'm' + name + ' '   + '\u001b[3' + c + 'm\u001b[90m'   + args[0] + '\u001b[3' + c + 'm'   + ' +' + exports.humanize(ms) + '\u001b[0m'; 
'blue' : ['\x1b[34m', '\x1b[39m'], 'cyan' : ['\x1b[36m', '\x1b[39m'], 'green' : ['\x1b[32m', '\x1b[39m'], 'magenta' : ['\x1b[35m', '\x1b[39m'], 'red' : ['\x1b[31m', '\x1b[39m'], 'yellow' : ['\x1b[33m', '\x1b[39m'],

i know windows console allows more colors six, color /? shows

0 = black       8 = gray 1 = blue        9 = light blue 2 = green       = light green 3 = aqua        b = light aqua 4 = red         c = light red 5 = purple      d = light purple 6 = yellow      e = light yellow 7 = white       f = bright white

how go understanding syntax , adding colors windows has offer?

those ansi terminal escape codes. specifically, they're "select graphic rendition" (sgr) escape codes, consist of:

  • the "command sequence introducer", consisting of characters \x1b (esc) , [,
  • one or more numeric commands, separated semicolons, and
  • the letter m, ending code , indicating sgr code.

there many possible numeric commands (and many other escape codes besides sgr), relevant ones are:

  • 30–37: set text color 1 of colors 0 7,
  • 40–47: set background color 1 of colors 0 7,
  • 39: reset text color default,
  • 49: reset background color default,
  • 1: make text bold / bright (this standard way access bright color variants),
  • 22: turn off bold / bright effect, and
  • 0: reset text properties (color, background, brightness, etc.) default values.

thus, example, 1 select bright purple text on green background (eww!) code \x1b[35;1;42m.


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