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* @license Apache-2.0
*
* Copyright (c) 2021 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 isFunction = require( '@stdlib/assert/is-function' );
var format = require( '@stdlib/string/format' );
var cwd = require( '@stdlib/process/cwd' );
var exists = require( '@stdlib/fs/exists' );
var validate = require( './validate.js' );
// MAIN //
/**
* Asynchronously resolves a path according to a predicate function by walking parent directories.
*
* @param {string} path - path to resolve
* @param {Options} [options] - function options
* @param {string} [options.dir] - base directory
* @param {Function} predicate - callback which tests whether a resolved path passes a test
* @param {Function} clbk - callback to invoke after resolving a path
* @throws {TypeError} first argument must be a string
* @throws {TypeError} predicate function argument must be a function
* @throws {TypeError} callback argument must be a function
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
*
* @example
* resolveParentPathBy( 'package.json', predicate, onPath );
*
* function predicate( path, next ) {
* next( null, true );
* }
*
* function onPath( error, path ) {
* if ( error ) {
* console.error( error.message );
* }
* console.log( path );
* }
*/
function resolveParentPathBy( path, options, predicate, clbk ) {
var spath;
var child;
var test;
var opts;
var done;
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 > 3 ) {
err = validate( opts, options );
if ( err ) {
throw err;
}
test = predicate;
done = clbk;
} else {
test = options;
done = predicate;
}
if ( !isFunction( test ) ) {
throw new TypeError( format( 'invalid argument. Predicate function must be a function. Value: `%s`.', test ) );
}
if ( !isFunction( done ) ) {
throw new TypeError( format( 'invalid argument. Callback argument must be a function. Value: `%s`.', done ) );
}
if ( opts.dir ) {
dir = resolve( cwd(), opts.dir );
} else {
dir = cwd();
}
spath = resolve( dir, path );
exists( spath, onExists );
/**
* Resolves the next candidate path.
*
* @private
* @returns {void}
*/
function next() {
// Resolve a parent directory:
child = dir;
dir = resolve( dir, '..' );
// If we have already reached root, we cannot resolve any higher directories...
if ( child === dir ) {
return done( null, null );
}
// Resolve the next search path:
spath = resolve( dir, path );
exists( spath, onExists );
}
/**
* Callback invoked after checking for path existence.
*
* @private
* @param {(Error|null)} error - error object
* @param {boolean} bool - boolean indicating if a path exists
* @returns {void}
*/
function onExists( error, bool ) { // eslint-disable-line n/handle-callback-err
if ( bool ) {
return test( spath, onTest );
}
next();
}
/**
* Callback invoked after testing a resolved path.
*
* @private
* @param {(Error|null)} error - error object
* @param {boolean} bool - boolean indicating if a path exists
* @returns {void}
*/
function onTest( error, bool ) {
if ( error ) {
return done( error );
}
if ( bool ) {
return done( null, spath );
}
next();
}
}
// EXPORTS //
module.exports = resolveParentPathBy;
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