86 lines
2.3 KiB
TypeScript
86 lines
2.3 KiB
TypeScript
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/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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// Based on @sergeche's work on the emmet plugin for atom
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// TODO: Move to https://github.com/emmetio/file-utils
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import * as path from 'path';
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import * as fs from 'fs';
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const reAbsolutePosix = /^\/+/;
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const reAbsoluteWin32 = /^\\+/;
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const reAbsolute = path.sep === '/' ? reAbsolutePosix : reAbsoluteWin32;
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/**
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* Locates given `filePath` on user’s file system and returns absolute path to it.
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* This method expects either URL, or relative/absolute path to resource
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* @param basePath Base path to use if filePath is not absoulte
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* @param filePath File to locate.
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*/
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export function locateFile(base: string, filePath: string): Promise<string> {
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if (/^\w+:/.test(filePath)) {
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// path with protocol, already absolute
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return Promise.resolve(filePath);
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}
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filePath = path.normalize(filePath);
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return reAbsolute.test(filePath)
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? resolveAbsolute(base, filePath)
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: resolveRelative(base, filePath);
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}
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/**
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* Resolves relative file path
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*/
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function resolveRelative(basePath: string, filePath: string): Promise<string> {
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return tryFile(path.resolve(basePath, filePath));
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}
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/**
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* Resolves absolute file path agaist given editor: tries to find file in every
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* parent of editor’s file
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*/
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function resolveAbsolute(basePath: string, filePath: string): Promise<string> {
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return new Promise((resolve, reject) => {
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filePath = filePath.replace(reAbsolute, '');
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const next = (ctx: string) => {
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tryFile(path.resolve(ctx, filePath))
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.then(resolve, () => {
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const dir = path.dirname(ctx);
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if (!dir || dir === ctx) {
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return reject(`Unable to locate absolute file ${filePath}`);
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}
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next(dir);
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});
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};
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next(basePath);
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});
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}
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/**
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* Check if given file exists and it’s a file, not directory
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*/
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function tryFile(file: string): Promise<string> {
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return new Promise((resolve, reject) => {
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fs.stat(file, (err, stat) => {
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if (err) {
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return reject(err);
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}
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if (!stat.isFile()) {
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return reject(new Error(`${file} is not a file`));
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}
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resolve(file);
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});
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});
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}
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