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 repeat = require( '@stdlib/string/repeat' );
// MAIN //
/**
* Returns a callback to be invoked upon calling the `blank` command.
*
* @private
* @param {Presentation} pres - presentation instance
* @returns {Function} callback
*/
function command( pres ) {
return onCommand;
/**
* Prints a "blank" slide.
*
* @private
*/
function onCommand() {
var str = repeat( pres._opts.newline, pres.height+1 );
pres._repl._ostream.write( str );
pres._repl.once( 'drain', onDrain );
/**
* Callback invoked upon a `drain` event.
*
* @private
*/
function onDrain() {
/*
* [ANSI escape sequences][1]:
*
* - `\u001b`: ESC, the escape character
* - `[1T`: scroll down one line
* - `[1G`: move the cursor to the beginning of the line
*
* [1]: https://en.wikipedia.org/wiki/ANSI_escape_code
*/
var str = '\u001b[1T\u001b[1G';
pres._repl._ostream.write( str );
}
}
}
// EXPORTS //
module.exports = command;
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