cli-color/lib/xterm-match.js

'use strict';

var push = Array.prototype.push, reduce = Array.prototype.reduce, abs = Math.abs
  , colors, match, result, i;

colors = require('./xterm-colors').map(function (color) {
	return {
		r: parseInt(color.slice(0, 2), 16),
		g: parseInt(color.slice(2, 4), 16),
		b: parseInt(color.slice(4), 16)
	};
});

match = colors.slice(0, 16);

module.exports = result = [];

i = 0;
while (i < 8) {
	result.push(30 + i++);
}
i = 0;
while (i < 8) {
	result.push(90 + i++);
}
push.apply(result, colors.slice(16).map(function (data) {
	var index, diff = Infinity;
	match.every(function (match, i) {
		var ndiff = reduce.call('rgb', function (diff, channel) {
			diff += abs(match[channel] - data[channel]);
			return diff;
		}, 0);
		if (ndiff < diff) {
			index = i;
			diff = ndiff;
		}
		return ndiff;
	});
	return result[index];
}));