Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @license Apache-2.0
*
* Copyright (c) 2019 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.
*/
/* eslint-disable no-underscore-dangle */
'use strict';
// MODULES //
var logger = require( 'debug' );
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var Stack = require( '@stdlib/dstructs/stack' );
var objectKeys = require( '@stdlib/utils/keys' );
var format = require( '@stdlib/string/format' );
// VARIABLES //
var debug = logger( 'repl:command:deeprerequire' );
// MAIN //
/**
* Returns a callback to be invoked upon calling the `deeprerequire` command.
*
* @private
* @param {REPL} repl - REPL instance
* @returns {Function} callback
*/
function command( repl ) {
return onCommand;
/**
* Reloads a previously loaded module and all its associated module dependencies.
*
* @private
* @param {string} id - module id or path
* @returns {*} resolved module
*/
function onCommand( id ) {
var nodes;
var stack;
var err;
var m;
var i;
if ( !isString( id ) ) {
err = new TypeError( format( 'invalid argument. Must provide a string. Value: `%s`.', id ) );
debug( 'Error: %s', err.message );
repl._ostream.write( 'Error: '+err.message+'\n' );
return;
}
// Resolve the module id to a path:
id = repl._context.require.resolve( id );
// Attempt to load the module (if already loaded, this is effectively a no-op; if not already loaded, loading a module does *not* guarantee that all associated module dependencies will be freshly loaded; hence, cannot just simply `require` the module id):
repl._context.require( id );
// Get the module object:
m = repl._context.require.cache[ id ];
// Perform a depth-first search to get a list of all module ids which need to be re-imported...
stack = new Stack();
nodes = {};
stack.push( m ); // push the root node onto the stack
while ( stack.length ) {
m = stack.pop();
if ( m && !hasOwnProp( nodes, m.id ) ) {
nodes[ m.id ] = true;
for ( i = 0; i < m.children.length; i++ ) {
stack.push( m.children[ i ] );
}
}
}
// Remove each module from the `require` cache...
nodes = objectKeys( nodes );
for ( i = 0; i < nodes.length; i++ ) {
delete repl._context.require.cache[ nodes[ i ] ];
}
// Re-require the module (and all its associated dependencies):
return repl._context.require( id );
}
}
// EXPORTS //
module.exports = command;
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