fix for issue #49 by exiting if too many wrong menu input given

> 40 for now

README.md

@@ -117,13 +117,17 @@ To 'login' as a user with private key K:
 nostr_console.exe  --prikey=K
 ```
 
-
 To get ALL the latest messages on relays for last 3 days (on bash shell which allows backtick execution), for user with private key K: 
 
 ```
 nostr_console.exe  --prikey=K --request=`echo "[\"REQ\",\"l\",{\"since\":$(date -d '-3 day' +%s)}]"`
 ```
  
+To get all encrypted messages:
+```
+./nostr_console_elf64 --prikey=K --request='["REQ","cn",{"limit":20000,"kinds":[104,140,141,142],"since":1663417739}]' # run on linux/bash
+```
+
 # Configuring Proxy
 When you are in an network which blocks outgoing HTTPS (e.g. company firewall), but there is a proxy you can set environment variable before running nostr_console.
 Examples below use authentication. Drop username:password if not required.

lib/console_ui.dart

@@ -448,6 +448,8 @@ int showMenu(List<String> menuOptions, String menuName, [String menuInfo = ""])
           if( valueOption >= 1 && valueOption <= menuOptions.length) {
             reAdjustAlignment(); // in case user has changed alignment
             print('You picked: $valueOption');
+            // reset this
+            gInvalidInputCount = 0;
             return valueOption;
           }
         }
@@ -458,6 +460,13 @@ int showMenu(List<String> menuOptions, String menuName, [String menuInfo = ""])
       }    
     }
     printWarning("\nInvalid option. Kindly try again. The valid options are from 1 to ${menuOptions.length}");
+    gInvalidInputCount++;
+
+    if( gInvalidInputCount > gMaxInValidInputAccepted) {
+      printWarning("The program has received an invalid input more than $gMaxInValidInputAccepted. There seems to be some problem etc, so exiting");
+      exit(0);
+      //programExit();
+    }
   }
 }
 
@@ -1576,3 +1585,12 @@ Future<void> mainMenuUi(Store node) async {
     } // end while
 } // end mainMenuUi()
 
+
+Future<void> programExit([String message= ""]) async {
+    if( gEventsFilename != "") {
+      await gStore?.writeEventsToFile(gEventsFilename);
+    }
+  print("In programexit");
+    exit(0);
+}
+

lib/settings.dart

@@ -187,6 +187,10 @@ const int gEventLenPrinted = 6;
 // used in word/event search
 const int gMinEventIdLenInSearch = gEventLenPrinted;
 
+// invalid int  handling
+int gInvalidInputCount = 0;
+const int gMaxInValidInputAccepted = 40;
+
 // https://www.lihaoyi.com/post/BuildyourownCommandLinewithANSIescapecodes.html#8-colors
 // Color related settings
 const String defaultTextColor = "green";

pubspec.yaml

@@ -7,7 +7,7 @@ homepage: https://github.com/vishalxl/nostr_console
 # improved 2 -> 5. better printing. and fixed white after reaction highlighed issue
 # improved 2 -> 6 too, now follows posts get highlighed, and so do their reactions. 
 # mentions get highlighed in above menus
-
+# if too many wrong menu inputs are given ( >40) then program exits without saving any new events. for issue #49 
 
 # 0.3.0
 # added check marks; added more default users