Allow reading from stdin

Author: Planeshifter

lib/node_modules/@stdlib/string/uppercase/bin/cli

@@ -7,6 +7,7 @@ var fs = require( 'fs' );
 var path = require( 'path' );
 var parseArgs = require( 'minimist' );
 var notifier = require( 'update-notifier' );
+var stdin = require( '@stdlib/utils/read-stdin' );
 var pkg = require( './../package.json' );
 var opts = require( './opts.json' );
 var uppercase = require( './../lib' );
@@ -72,7 +73,7 @@ function version() {
 // VARIABLES //
 
 var args;
-
+var str;
 
 // MAIN //
 
@@ -87,4 +88,25 @@ if ( args.help ) {
 if ( args.version ) {
 	return version();
 }
-console.log( uppercase( args._[0] ) );
+
+// Check if we are receiving data from `stdin`...
+if ( !process.stdin.isTTY ) {
+	return stdin( onRead );
+}
+str = uppercase( args._[0] );
+console.log( str );
+
+/**
+* Callback invoked upon reading from `stdin`.
+*
+* @private
+* @param {(Error|null)} error - error object
+* @param {Buffer} data - data
+*/
+function onRead( error, data ) {
+	if ( error ) {
+		return done( error );
+	}
+	str = uppercase( data.toString() );
+	console.log( str );
+} // end FUNCTION onRead()