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feat: Add common to std/path (#4527)
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commit
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4 changed files with 102 additions and 23 deletions
38
std/path/common.ts
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38
std/path/common.ts
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@ -0,0 +1,38 @@
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { SEP } from "./constants.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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* import { common } from "https://deno.land/std/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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47
std/path/common_test.ts
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47
std/path/common_test.ts
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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const { test } = Deno;
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import { assertEquals } from "../testing/asserts.ts";
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import { common } from "./mod.ts";
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test({
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name: "path - common - basic usage",
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fn() {
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const actual = common(
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[
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"file://deno/cli/js/deno.ts",
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"file://deno/std/path/mod.ts",
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"file://deno/cli/js/main.ts",
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],
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"/"
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);
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assertEquals(actual, "file://deno/");
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},
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});
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test({
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name: "path - common - no shared",
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fn() {
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const actual = common(
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["file://deno/cli/js/deno.ts", "https://deno.land/std/path/mod.ts"],
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"/"
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);
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assertEquals(actual, "");
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},
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});
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test({
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name: "path - common - windows sep",
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fn() {
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const actual = common(
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[
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"c:\\deno\\cli\\js\\deno.ts",
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"c:\\deno\\std\\path\\mod.ts",
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"c:\\deno\\cli\\js\\main.ts",
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],
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"\\"
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);
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assertEquals(actual, "c:\\deno\\");
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},
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});
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@ -1,5 +1,5 @@
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// Copyright the Browserify authors. MIT License.
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// Ported from https://github.com/browserify/path-browserify/
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// Ported mostly from https://github.com/browserify/path-browserify/
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import * as _win32 from "./win32.ts";
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import * as _posix from "./posix.ts";
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@ -10,20 +10,23 @@ const path = isWindows ? _win32 : _posix;
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export const win32 = _win32;
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export const posix = _posix;
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export const resolve = path.resolve;
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export const normalize = path.normalize;
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export const isAbsolute = path.isAbsolute;
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export const join = path.join;
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export const relative = path.relative;
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export const toNamespacedPath = path.toNamespacedPath;
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export const dirname = path.dirname;
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export const basename = path.basename;
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export const extname = path.extname;
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export const format = path.format;
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export const parse = path.parse;
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export const sep = path.sep;
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export const delimiter = path.delimiter;
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export const {
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resolve,
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normalize,
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isAbsolute,
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join,
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relative,
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toNamespacedPath,
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dirname,
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basename,
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extname,
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format,
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parse,
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sep,
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delimiter,
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} = path;
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export { common } from "./common.ts";
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export { EOL, SEP, SEP_PATTERN, isWindows } from "./constants.ts";
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export * from "./interface.ts";
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export * from "./glob.ts";
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import "./basename_test.ts";
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import "./dirname_test.ts";
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import "./extname_test.ts";
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import "./isabsolute_test.ts";
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import "./join_test.ts";
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import "./parse_format_test.ts";
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import "./relative_test.ts";
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import "./resolve_test.ts";
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import "./zero_length_strings_test.ts";
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