Display host help even if not in a function app directory.

Author: ahmelsayed

src/Azure.Functions.Cli/Actions/HelpAction.cs

@@ -13,6 +13,7 @@
 using System.Text;
 using Fclp.Internals;
 using Colors.Net.StringColorExtensions;
+using Azure.Functions.Cli.Helpers;
 
 namespace Azure.Functions.Cli.Actions
 {
@@ -56,6 +57,8 @@ public HelpAction(IEnumerable<TypeAttributePair> actions, Func<Type, IAction> cr
 
         public override Task RunAsync()
         {
+            ScriptHostHelpers.SetIsHelpRunning();
+
             Utilities.PrintLogo();
             if (!string.IsNullOrEmpty(_context) || !string.IsNullOrEmpty(_subContext))
             {

src/Azure.Functions.Cli/Helpers/ScriptHostHelpers.cs

@@ -17,6 +17,12 @@ namespace Azure.Functions.Cli.Helpers
     public static class ScriptHostHelpers
     {
         private const TraceLevel DefaultTraceLevel = TraceLevel.Info;
+        private static bool _isHelpRunning = false;
+
+        public static void SetIsHelpRunning()
+        {
+            _isHelpRunning = true;
+        }
 
         public static FunctionMetadata GetFunctionMetadata(string functionName)
         {
@@ -39,6 +45,11 @@ public static FunctionMetadata GetFunctionMetadata(string functionName)
 
         public static string GetFunctionAppRootDirectory(string startingDirectory)
         {
+            if (_isHelpRunning)
+            {
+                return startingDirectory;
+            }
+
             var hostJson = Path.Combine(startingDirectory, ScriptConstants.HostMetadataFileName);
             if (FileSystemHelpers.FileExists(hostJson))
             {