CLI: Implement --reader switch to specify a particular PC/SC reader. (#322)

cli/args_bridge.js

@@ -39,6 +39,9 @@ parser.add_argument("--non-interactive", {
     action: "store_true",
     "default": false
 });
+parser.add_argument("--reader", {
+    help: "Name of the PC/SC reader to be used."
+});
 
 function parseArgs() {
     return parser.parse_args();

cli/args_cli.js

@@ -12,6 +12,7 @@ const parser = new ArgumentParser({
     description: 'HaLo - Command Line Tool for PC/SC'
 });
 parser.add_argument("-o", "--output", {help: "Output format, either: color (default, better for humans), json (better for scripts).", "default": "color"});
+parser.add_argument("--reader", {help: "Name of the PC/SC reader to be used."});
 
 const subparsers = parser.add_subparsers({help: 'command', dest: 'name'});
 

cli/cli.js

@@ -38,6 +38,15 @@ async function checkCard(reader) {
 
 function runHalo(entryMode, args) {
     nfc.on('reader', reader => {
+        reader.autoProcessing = false;
+
+        reader.on('error', err => {
+            console.log(`${reader.reader.name} an error occurred`, err);
+        });
+
+        if (args.reader && args.reader !== reader.reader.name) {
+            return;
+        }
 
         if (args.name === "pcsc_detect") {
             console.log('Detected PC/SC reader:', reader.reader.name);
@@ -45,8 +54,6 @@ function runHalo(entryMode, args) {
             wsEventReaderConnected(reader);
         }
 
-        reader.autoProcessing = false;
-
         reader.on('card', card => {
             if (entryMode === "server") {
                 (async () => {
@@ -121,11 +128,6 @@ function runHalo(entryMode, args) {
                 wsEventReaderDisconnected(reader);
             }
         });
-
-        reader.on('error', err => {
-            console.log(`${reader.reader.name} an error occurred`, err);
-        });
-
     });
 
     nfc.on('error', err => {