cli (2500B)
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 stdinStream = require( '@stdlib/streams/node/stdin' ); 30 var RE_EOL = require( '@stdlib/regexp/eol' ).REGEXP; 31 var isRegExpString = require( '@stdlib/assert/is-regexp-string' ); 32 var reFromString = require( '@stdlib/utils/regexp-from-string' ); 33 var replace = require( './../lib' ); 34 35 36 // MAIN // 37 38 /** 39 * Main execution sequence. 40 * 41 * @private 42 * @returns {void} 43 */ 44 function main() { 45 var search; 46 var flags; 47 var args; 48 var cli; 49 50 // Create a command-line interface: 51 cli = new CLI({ 52 'pkg': require( './../package.json' ), 53 'options': require( './../etc/cli_opts.json' ), 54 'help': readFileSync( resolve( __dirname, '..', 'docs', 'usage.txt' ), { 55 'encoding': 'utf8' 56 }) 57 }); 58 59 // Get any provided command-line options: 60 flags = cli.flags(); 61 if ( flags.help || flags.version ) { 62 return; 63 } 64 65 // Get any provided command-line arguments: 66 args = cli.args(); 67 68 search = flags.search; 69 if ( isRegExpString( search ) ) { 70 search = reFromString( search ); 71 } 72 73 // Check if we are receiving data from `stdin`... 74 if ( !stdinStream.isTTY ) { 75 return stdin( onRead ); 76 } 77 console.log( replace( args[ 0 ], search, flags.newval ) ); // eslint-disable-line no-console 78 79 /** 80 * Callback invoked upon reading from `stdin`. 81 * 82 * @private 83 * @param {(Error|null)} error - error object 84 * @param {Buffer} data - data 85 * @returns {void} 86 */ 87 function onRead( error, data ) { 88 var lines; 89 var i; 90 if ( error ) { 91 return cli.error( error ); 92 } 93 lines = data.toString().split( RE_EOL ); 94 for ( i = 0; i < lines.length; i++ ) { 95 console.log( replace( lines[ i ], search, flags.newval ) ); // eslint-disable-line no-console 96 } 97 } 98 } 99 100 main();