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79 lines
2.3 KiB
TypeScript
79 lines
2.3 KiB
TypeScript
// Loaded from https://deno.land/x/cliffy@v0.18.0/ansi/colors.ts
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import * as stdColors from "https://deno.land/std@0.89.0/fmt/colors.ts";
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type ExcludedColorMethods = "setColorEnabled" | "getColorEnabled";
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type PropertyNames = keyof typeof stdColors;
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type ColorMethod = (str: string, ...args: Array<unknown>) => string;
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type ColorMethods = Exclude<PropertyNames, ExcludedColorMethods>;
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type Chainable<T, E extends keyof T | null = null> = {
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[P in keyof T]: P extends E ? T[P] : Chainable<T, E> & T[P];
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};
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/** Chainable colors instance returned by all ansi escape properties. */
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export type ColorsChain =
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& Chainable<typeof stdColors, ExcludedColorMethods>
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& { _stack: Array<ColorMethods> };
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/** Create new `Colors` instance. */
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export type ColorsFactory = () => Colors;
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/**
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* Chainable colors module.
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* If invoked as method, a new `Colors` instance will be returned.
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*/
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export type Colors = ColorsFactory & ColorsChain;
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const proto = Object.create(null);
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const methodNames = Object.keys(stdColors) as Array<PropertyNames>;
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for (const name of methodNames) {
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if (name === "setColorEnabled" || name === "getColorEnabled") {
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continue;
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}
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Object.defineProperty(proto, name, {
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get(this: ColorsChain) {
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return factory([...this._stack, name]);
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},
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});
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}
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export const colors: Colors = factory();
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/**
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* Chainable colors module.
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* ```
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* console.log(colors.blue.bgRed.bold('Welcome to Deno.Land!'));
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* ```
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* If invoked as method, a new Ansi instance will be returned.
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* ```
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* const myColors: Colors = colors();
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* console.log(myColors.blue.bgRed.bold('Welcome to Deno.Land!'));
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* ```
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*/
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function factory(stack: Array<ColorMethods> = []): Colors {
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const colors: Colors = function (
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this: ColorsChain | undefined,
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str?: string,
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...args: Array<unknown>
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): string | ColorsChain {
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if (str) {
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const lastIndex = stack.length - 1;
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return stack.reduce(
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(str: string, name: PropertyNames, index: number) =>
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index === lastIndex
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? (stdColors[name] as ColorMethod)(str, ...args)
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: (stdColors[name] as ColorMethod)(str),
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str,
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);
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}
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const tmp = stack.slice();
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stack = [];
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return factory(tmp);
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} as Colors;
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Object.setPrototypeOf(colors, proto);
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colors._stack = stack;
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return colors;
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}
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