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#!/usr/bin/env node
* @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 readFileSync = require( '@stdlib/fs-read-file' ).sync;
var CLI = require( '@stdlib/cli-ctor' );
var stdin = require( '@stdlib/process-read-stdin' );
var stdinStream = require( '@stdlib/streams-node-stdin' );
var RE_EOL = require( '@stdlib/regexp-eol' ).REGEXP;
var reFromString = require( '@stdlib/utils-regexp-from-string' );
var fromCodePoint = require( '@stdlib/string-from-code-point' );
* Main execution sequence.
* @returns {void}
function main() {
	var flags;
	// Create a command-line interface:
	cli = new CLI({
		'pkg': require( './../package.json' ),
		'options': require( './../etc/cli_opts.json' ),
		'help': readFileSync( resolve( __dirname, '..', 'docs', 'usage.txt' ), {
			'encoding': 'utf8'
	// Get any provided command-line options:
	flags = cli.flags();
	if ( flags.help || flags.version ) {
	// Get any provided command-line arguments:
	args = cli.args();
	// Check if we are receiving data from `stdin`...
	if ( stdinStream.isTTY ) {
		for ( i = 0; i < args.length; i++ ) {
			args[ i ] = parseInt( args[ i ], 10 );
		return console.log( fromCodePoint( args ) ); // eslint-disable-line no-console
	return stdin( onRead );
	* Callback invoked upon reading from `stdin`.
	* @private
	* @param {(Error|null)} error - error object
	* @param {Buffer} data - data
	* @returns {void}
	function onRead( error, data ) {
		var flags;
		if ( error ) {
			return cli.error( error );
		flags = cli.flags();
		if ( flags.split ) {
			sep = reFromString( flags.split );
			if ( sep === null ) {
				// If the previous command "failed", we were not provided a regular expression:
				sep = flags.split;
			sep = RE_EOL;
		data = data.toString().split( sep );
		// Remove any trailing separators (e.g., trailing newline)...
		if ( data[ data.length-1 ] === '' ) {
			data.pop();
		// Cast all values to integers...
		for ( i = 0; i < data.length; i++ ) {
			data[ i ] = parseInt( data[ i ], 10 );
		console.log( fromCodePoint( data ) ); // eslint-disable-line no-console

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