127 lines
2.4 KiB
Markdown
127 lines
2.4 KiB
Markdown
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@license Apache-2.0
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Copyright (c) 2018 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# Standard Input
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> [Standard input][standard-streams].
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<section class="usage">
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## Usage
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```javascript
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var stdin = require( '@stdlib/streams/node/stdin' );
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```
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#### stdin
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[Standard input][standard-streams] as a [Readable stream][readable-stream].
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<!-- run-disable -->
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```javascript
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var string2buffer = require( '@stdlib/buffer/from-string' );
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var Buffer = require( '@stdlib/buffer/ctor' );
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var data = [];
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var len = 0;
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stdin.on( 'readable', onReadable );
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stdin.on( 'error', onError );
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stdin.on( 'end', onEnd );
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function onReadable() {
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var chunk;
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while ( true ) {
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chunk = stdin.read();
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if ( chunk === null ) {
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break;
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}
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if ( typeof chunk === 'string' ) {
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chunk = string2buffer( chunk );
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}
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data.push( chunk );
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len += chunk.length;
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}
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}
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function onError( error ) {
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if ( error ) {
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console.error( error.message );
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}
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}
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function onEnd() {
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data = Buffer.concat( data, len );
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console.log( data.toString() );
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// => '...'
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}
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```
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</section>
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<!-- /.usage -->
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<section class="examples">
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## Examples
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<!-- run-disable -->
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<!-- eslint no-undef: "error" -->
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```javascript
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var proc = require( 'process' );
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var stdin = require( '@stdlib/streams/node/stdin' );
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var stdout = require( '@stdlib/streams/node/stdout' );
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// Set the encoding:
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stdin.setEncoding( 'utf8' );
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// Create an echo stream:
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stdin.pipe( stdout );
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// Push data to `stdin`:
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stdin.push( 'beep' );
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stdin.push( ' ' );
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stdin.push( 'boop' );
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stdin.push( '\n' );
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// End the stream:
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stdin.push( null );
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// Ensure the process closes:
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setTimeout( proc.exit, 1000 );
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```
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</section>
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<!-- /.examples -->
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<section class="links">
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[standard-streams]: https://en.wikipedia.org/wiki/Standard_streams
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[readable-stream]: https://nodejs.org/api/stream.html#stream_class_stream_readable
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</section>
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<!-- /.links -->
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