Creating a new view with an invalid class name now shows nicer error

Fixes #285

src/SourceCodeFile.cs

@@ -57,6 +57,11 @@ public SourceCodeFile(string path)
     /// </summary>
     public FileInfo DesignerFile { get; }
 
+    /// <summary>
+    /// Returns the class name for the file e.g. for /SomeDir/MyClass.cs it will return MyClass
+    /// </summary>
+    public string ClassName => Path.GetFileNameWithoutExtension(CsFile.Name);
+
     /// <summary>
     /// Returns the .Designer.cs file for the given class file.
     /// Returns a reference even if that file does not exist.

src/ToCode/CodeDomArgs.cs

@@ -113,6 +113,11 @@ public static string MakeValidFieldName(string? name, bool isPublic = false)
         return name;
     }
 
+    internal static bool IsValidIdentifier(string name)
+    {
+        return cSharpCodeProvider.IsValidIdentifier(name);
+    }
+
     /// <summary>
     /// Returns a unique field name based on the passed value.
     /// Removes non word characters and applies a numerical

src/ToCode/ViewToCode.cs

@@ -79,7 +79,7 @@ public Design GenerateNewView(FileInfo csFilePath, string namespaceName, Type vi
 
         var sourceFile = new SourceCodeFile(csFilePath);
 
-        var className = Path.GetFileNameWithoutExtension(sourceFile.CsFile.Name);
+        var className = sourceFile.ClassName;
 
         var csharpCode = GetGenerateNewViewCode(className, namespaceName);
         File.WriteAllText(sourceFile.CsFile.FullName, csharpCode);

src/UI/Editor.cs

@@ -571,6 +571,22 @@ private void BuildRootMenu()
                         break;
                 }
             }
+
+
+            if (e == this.keyMap.New)
+            {
+                this.New();
+            }
+
+            if (e == this.keyMap.ShowHelp)
+            {
+                this.ShowHelp();
+            }
+
+            if (e == this.keyMap.Open)
+            {
+                this.Open();
+            }
         };
 
         this.Add(this.rootCommandsListView);
@@ -956,6 +972,13 @@ private void New()
                 // Check if we are about to overwrite some files
                 // and if so warn the user
                 var files = new SourceCodeFile(file);
+
+                if(!CodeDomArgs.IsValidIdentifier(files.ClassName))
+                {
+                    ChoicesDialog.Query("Invalid Name",$"Invalid class name '{files.ClassName}'","Ok");
+                    return;
+                }
+
                 var sb = new StringBuilder();
 
                 if (files.CsFile.Exists)