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@timw4mail
Created January 10, 2024 20:57
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256 color terminal demo
export enum Ground {
Fore = 38,
Back = 48,
}
const code = (
param: string | number | string[] | number[],
suffix: string = '',
): string => {
if (Array.isArray(param)) {
param = param.join(';');
}
return ['\x1b[', param, suffix].join('');
};
const textFormat = (param: string | number | string[] | number[]): string =>
code(param, 'm');
const color256 = (value: number, ground: Ground): string =>
textFormat([ground, 5, value]);
let colorTable = '';
const doubleBreaks = [15, 51, 87, 123, 159, 195, 231, 255];
[
7,
15,
21,
27,
33,
39,
45,
51,
57,
63,
69,
75,
81,
87,
93,
99,
105,
111,
117,
123,
129,
135,
141,
147,
153,
159,
165,
171,
177,
183,
189,
195,
201,
207,
213,
219,
225,
231,
237,
243,
249,
255,
].forEach((line, n, breaks) => {
const start = (n > 0) ? breaks[n - 1] + 1 : 0;
const end = line + 1;
let i = 0;
for (i = start; i < end; i++) {
colorTable += color256(i, Ground.Fore);
colorTable += String(i).padStart(4, ' ').padEnd(5, ' ');
colorTable += textFormat('');
}
colorTable += ' '.repeat(5);
for (i = start; i < end; i++) {
colorTable += color256(i, Ground.Back);
colorTable += String(i).padStart(4, ' ').padEnd(5, ' ');
colorTable += textFormat('');
}
colorTable += '\n';
if (doubleBreaks.includes(line)) {
colorTable += '\n';
}
});
console.log(colorTable);
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