time-to-botec

Benchmark sampling in different programming languages
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cli (2388B)

      1 #!/usr/bin/env node
      2 
      3 /**
      4 * @license Apache-2.0
      5 *
      6 * Copyright (c) 2018 The Stdlib Authors.
      7 *
      8 * Licensed under the Apache License, Version 2.0 (the "License");
      9 * you may not use this file except in compliance with the License.
     10 * You may obtain a copy of the License at
     11 *
     12 *    http://www.apache.org/licenses/LICENSE-2.0
     13 *
     14 * Unless required by applicable law or agreed to in writing, software
     15 * distributed under the License is distributed on an "AS IS" BASIS,
     16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     17 * See the License for the specific language governing permissions and
     18 * limitations under the License.
     19 */
     20 
     21 'use strict';
     22 
     23 // MODULES //
     24 
     25 var resolve = require( 'path' ).resolve;
     26 var readFileSync = require( '@stdlib/fs/read-file' ).sync;
     27 var CLI = require( '@stdlib/cli/ctor' );
     28 var stdout = require( '@stdlib/streams/node/stdout' );
     29 var constantStream = require( './../lib' );
     30 
     31 
     32 // FUNCTIONS //
     33 
     34 /**
     35 * Callback invoked once a source stream ends.
     36 *
     37 * @private
     38 */
     39 function onEnd() {
     40 	// Append a trailing newline in accordance with standard POSIX behavior:
     41 	console.log( '' ); // eslint-disable-line no-console
     42 }
     43 
     44 
     45 // MAIN //
     46 
     47 /**
     48 * Main execution sequence.
     49 *
     50 * @private
     51 * @returns {void}
     52 */
     53 function main() {
     54 	var stream;
     55 	var flags;
     56 	var opts;
     57 	var args;
     58 	var cli;
     59 	var err;
     60 
     61 	// Create a command-line interface:
     62 	cli = new CLI({
     63 		'pkg': require( './../package.json' ),
     64 		'options': require( './../etc/cli_opts.json' ),
     65 		'help': readFileSync( resolve( __dirname, '..', 'docs', 'usage.txt' ), {
     66 			'encoding': 'utf8'
     67 		})
     68 	});
     69 
     70 	// Get any provided command-line options:
     71 	flags = cli.flags();
     72 	if ( flags.help || flags.version ) {
     73 		return;
     74 	}
     75 
     76 	// Get any provided command-line arguments:
     77 	args = cli.args();
     78 	if ( args.length < 1 ) {
     79 		err = new Error( 'insufficient arguments. Must provide a value to stream.' );
     80 		return onError( err );
     81 	}
     82 
     83 	opts = {};
     84 	if ( flags.iter ) {
     85 		opts.iter = parseInt( flags.iter, 10 );
     86 	}
     87 	if ( flags.sep ) {
     88 		opts.sep = flags.sep;
     89 	}
     90 
     91 	// Create a source stream and pipe to `stdout`:
     92 	stream = constantStream( args[ 0 ].toString(), opts );
     93 	stream.on( 'end', onEnd );
     94 
     95 	stream.pipe( stdout );
     96 
     97 	/**
     98 	* Callback invoked upon encountering an error.
     99 	*
    100 	* @private
    101 	* @param {Error} error - error
    102 	* @param {integer} [code] - exit code
    103 	*/
    104 	function onError( error, code ) {
    105 		cli.error( error, code || 1 );
    106 	}
    107 }
    108 
    109 main();