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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 isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var format = require( '@stdlib/string/format' );
var objectKeys = require( '@stdlib/utils/keys' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
// VARIABLES //
var debug = logger( 'repl:command:presentation_stop' );
// MAIN //
/**
* Returns a callback to be invoked upon calling the `presentationStop` command.
*
* @private
* @param {REPL} repl - REPL instance
* @returns {Function} callback
*/
function command( repl ) {
return onCommand;
/**
* Stops a REPL presentation.
*
* @private
* @param {(NonNegativeInteger|string)} [id] - presentation identifier
* @returns {boolean} boolean indicating whether a REPL presentation is successfully stopped
*/
function onCommand( id ) {
var cache;
var keys;
var FLG;
var err;
var key;
var ws;
var i;
var o;
cache = repl._internal.presentation.cache;
if ( arguments.length ) {
if ( !isString( id ) && !isNonNegativeInteger( id ) ) {
err = new TypeError( format( 'invalid argument. Invalid presentation identifier. Must be either a string or nonnegative integer. Value: `%s`.', id ) );
debug( 'Error: %s', err.message );
repl._ostream.write( 'Error: '+err.message+'\n' );
return false;
}
key = id;
} else {
ws = repl._currentWorkspace;
keys = objectKeys( cache );
for ( i = 0; i < keys.length; i++ ) {
if ( cache[ keys[ i ] ].w === ws ) {
key = cache[ keys[ i ] ].i;
break;
}
}
if ( key === void 0 ) {
err = new Error( 'invalid invocation. Not currently in a presentation workspace. Must provide either a string or nonnegative integer which corresponds to the identifier of the presentation to be stopped.' );
debug( 'Error: %s', err.message );
repl._ostream.write( 'Error: '+err.message+'\n' );
return false;
}
}
if ( !hasOwnProp( cache, key ) ) {
debug( 'Unrecognized presentation identifier: %d', key );
return false;
}
debug( 'Stopping presentation: %d', key );
// Retrieve the presentation data:
o = cache[ key ];
// Delete the presentation workspace...
if ( o.w !== 'base' ) {
debug( 'Deleting workspace: %s', o.w );
FLG = repl._quiet;
repl._quiet = true; // temporarily silence logging
repl._context.deleteWorkspace( o.w );
repl._quiet = FLG;
}
// Ensure that we no longer watch presentation files (if enabled):
o.p.unwatch();
// Update the internal resource cache for tracking presentations:
delete cache[ key ];
return true;
}
}
// EXPORTS //
module.exports = command;
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