didier amyot
0d627c9051
The class was already implemented in "https://deno.land/std@0.144.0/streams/conversion.ts". So, I litterally lost 1 day of work! I hate myself.
41 lines
1.2 KiB
TypeScript
41 lines
1.2 KiB
TypeScript
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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import { SEP } from "./separator.ts";
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/** Determines the common path from a set of paths, using an optional separator,
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* which defaults to the OS default separator.
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*
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* ```ts
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* import { common } from "https://deno.land/std@$STD_VERSION/path/mod.ts";
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* const p = common([
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* "./deno/std/path/mod.ts",
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* "./deno/std/fs/mod.ts",
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* ]);
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* console.log(p); // "./deno/std/"
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* ```
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*/
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export function common(paths: string[], sep = SEP): string {
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const [first = "", ...remaining] = paths;
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if (first === "" || remaining.length === 0) {
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return first.substring(0, first.lastIndexOf(sep) + 1);
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}
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const parts = first.split(sep);
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let endOfPrefix = parts.length;
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for (const path of remaining) {
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const compare = path.split(sep);
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for (let i = 0; i < endOfPrefix; i++) {
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if (compare[i] !== parts[i]) {
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endOfPrefix = i;
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}
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}
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if (endOfPrefix === 0) {
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return "";
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}
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}
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const prefix = parts.slice(0, endOfPrefix).join(sep);
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return prefix.endsWith(sep) ? prefix : `${prefix}${sep}`;
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}
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