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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var resolve = require( 'path' ).resolve;
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var cwd = require( '@stdlib/process/cwd' );
var exists = require( '@stdlib/fs/exists' ).sync;
var format = require( '@stdlib/string/format' );
var validate = require( './validate.js' );
// MAIN //
/**
* Synchronously resolves a path by walking parent directories.
*
* @param {string} path - path to resolve
* @param {Options} [options] - function options
* @param {string} [options.dir] - base directory
* @throws {TypeError} first argument must be a string
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
* @returns {(string|null)} resolved path or null
*
* @example
* var path = resolveParentPath( 'package.json' );
*/
function resolveParentPath( path, options ) {
var spath;
var child;
var opts;
var dir;
var err;
if ( !isString( path ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', path ) );
}
opts = {};
if ( arguments.length > 1 ) {
err = validate( opts, options );
if ( err ) {
throw err;
}
}
if ( opts.dir ) {
dir = resolve( cwd(), opts.dir );
} else {
dir = cwd();
}
// Start at a base directory and continue moving up through each parent directory until able to resolve a search path or until reaching the root directory...
while ( child !== dir ) {
spath = resolve( dir, path );
if ( exists( spath ) ) {
return spath;
}
child = dir;
dir = resolve( dir, '..' );
}
return null;
}
// EXPORTS //
module.exports = resolveParentPath;
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