cli (2340B)
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 stdin = require( '@stdlib/process/read-stdin' ); 29 var cwd = require( '@stdlib/process/cwd' ); 30 var writeFile = require( './../lib' ); 31 32 33 // MAIN // 34 35 /** 36 * Main execution sequence. 37 * 38 * @private 39 * @returns {void} 40 */ 41 function main() { 42 var flags; 43 var fpath; 44 var args; 45 var opts; 46 var cli; 47 48 // Create a command-line interface: 49 cli = new CLI({ 50 'pkg': require( './../package.json' ), 51 'options': require( './../etc/cli_opts.json' ), 52 'help': readFileSync( resolve( __dirname, '..', 'docs', 'usage.txt' ), { 53 'encoding': 'utf8' 54 }) 55 }); 56 57 // Get any provided command-line options: 58 flags = cli.flags(); 59 if ( flags.help || flags.version ) { 60 return; 61 } 62 63 // Get any provided command-line arguments: 64 args = cli.args(); 65 66 opts = {}; 67 if ( flags.encoding ) { 68 opts.encoding = flags.encoding; 69 } 70 if ( flags.flag ) { 71 opts.flag = flags.flag; 72 } 73 if ( flags.mode ) { 74 opts.mode = parseInt( flags.mode, 8 ); 75 } 76 fpath = resolve( cwd(), args[ 0 ] ); 77 78 // Gather data from `stdin`... 79 return stdin( onRead ); 80 81 /** 82 * Callback invoked upon reading from `stdin`. 83 * 84 * @private 85 * @param {(Error|null)} error - error object 86 * @param {Buffer} data - data 87 * @returns {void} 88 */ 89 function onRead( error, data ) { 90 if ( error ) { 91 return cli.error( error ); 92 } 93 writeFile( fpath, data, opts, onWrite ); 94 } 95 96 /** 97 * Callback invoked upon writing a file. 98 * 99 * @private 100 * @param {Error} [error] - error object 101 * @returns {void} 102 */ 103 function onWrite( error ) { 104 if ( error ) { 105 return cli.error( error ); 106 } 107 } 108 } 109 110 main();