The Standard Library has been moved to JSR. See the blog post for details.
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
import { SEP } from "./separator.ts";
/** Determines the common path from a set of paths, using an optional separator, * which defaults to the OS default separator. * * import { common } from "https://deno.land/std/path/mod.ts"; * const p = common([ * "./deno/std/path/mod.ts", * "./deno/std/fs/mod.ts", * ]); * console.log(p); // "./deno/std/" * */export function common(paths: string[], sep = SEP): string { const [first = "", ...remaining] = paths; if (first === "" || remaining.length === 0) { return first.substring(0, first.lastIndexOf(sep) + 1); } const parts = first.split(sep);
let endOfPrefix = parts.length; for (const path of remaining) { const compare = path.split(sep); for (let i = 0; i < endOfPrefix; i++) { if (compare[i] !== parts[i]) { endOfPrefix = i; } }
if (endOfPrefix === 0) { return ""; } } const prefix = parts.slice(0, endOfPrefix).join(sep); return prefix.endsWith(sep) ? prefix : `${prefix}${sep}`;}