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