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denoland-deno/colors/main.ts

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2018-12-18 23:30:44 -05:00
// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import { styles } from "./styles.ts";
type Styles = { readonly [S in keyof typeof styles]: Color };
type Color = Styles & {
(str: string): string;
};
const styleStack: string[] = [];
export const color = function color(str: string): string {
styleStack.reverse();
while (styleStack.length) {
const style = styleStack.pop();
const code = styles[style];
str = `${code.open}${str.replace(code.closeRe, code.open)}${
code.close
}`.replace(/\r?\n/g, `${code.close}$&${code.open}`);
}
return str;
} as Color;
for (const style of Object.keys(styles)) {
Object.defineProperty(color, style, {
get() {
styleStack.push(style);
return color;
},
enumerable: true,
configurable: false
});
}