Open up content dialogs for invalid URIs and unsupported schemes

src/cascadia/TerminalApp/Resources/en-US/Resources.resw

@@ -1,17 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <root>
-  <!--
-    Microsoft ResX Schema
-
+  <!-- 
+    Microsoft ResX Schema 
+    
     Version 2.0
-
-    The primary goals of this format is to allow a simple XML format
-    that is mostly human readable. The generation and parsing of the
-    various data types are done through the TypeConverter classes
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
     associated with the data types.
-
+    
     Example:
-
+    
     ... ado.net/XML headers & schema ...
     <resheader name="resmimetype">text/microsoft-resx</resheader>
     <resheader name="version">2.0</resheader>
@@ -26,36 +26,36 @@
         <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
         <comment>This is a comment</comment>
     </data>
-
-    There are any number of "resheader" rows that contain simple
+                
+    There are any number of "resheader" rows that contain simple 
     name/value pairs.
-
-    Each data row contains a name, and value. The row also contains a
-    type or mimetype. Type corresponds to a .NET class that support
-    text/value conversion through the TypeConverter architecture.
-    Classes that don't support this are serialized and stored with the
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
     mimetype set.
-
-    The mimetype is used for serialized objects, and tells the
-    ResXResourceReader how to depersist the object. This is currently not
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
     extensible. For a given mimetype the value must be set accordingly:
-
-    Note - application/x-microsoft.net.object.binary.base64 is the format
-    that the ResXResourceWriter will generate, however the reader can
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
     read any of the formats listed below.
-
+    
     mimetype: application/x-microsoft.net.object.binary.base64
-    value   : The object must be serialized with
+    value   : The object must be serialized with 
             : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
             : and then encoded with base64 encoding.
-
+    
     mimetype: application/x-microsoft.net.object.soap.base64
-    value   : The object must be serialized with
+    value   : The object must be serialized with 
             : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
             : and then encoded with base64 encoding.
 
     mimetype: application/x-microsoft.net.object.bytearray.base64
-    value   : The object must be serialized into a byte array
+    value   : The object must be serialized into a byte array 
             : using a System.ComponentModel.TypeConverter
             : and then encoded with base64 encoding.
     -->
@@ -652,4 +652,13 @@
   <data name="CloseTabsAfterDefaultCommandKey" xml:space="preserve">
     <value>Close all tabs after the current tab</value>
   </data>
+  <data name="InvalidUriText" xml:space="preserve">
+    <value>This link is invalid:</value>
+  </data>
+  <data name="UnsupportedSchemeText" xml:space="preserve">
+    <value>This link type is currently not supported:</value>
+  </data>
+  <data name="CouldNotOpenUriDialog.PrimaryButtonText" xml:space="preserve">
+    <value>Cancel</value>
+  </data>
 </root>

src/cascadia/TerminalApp/TerminalPage.cpp

@@ -1805,8 +1805,37 @@ namespace winrt::TerminalApp::implementation
             {
                 ShellExecute(nullptr, L"open", eventArgs.Uri().c_str(), nullptr, nullptr, SW_SHOWNORMAL);
             }
+            else
+            {
+                _ShowCouldNotOpenDialog(RS_(L"UnsupportedSchemeText"), eventArgs.Uri());
+            }
+        }
+        catch (...)
+        {
+            LOG_CAUGHT_EXCEPTION();
+            _ShowCouldNotOpenDialog(RS_(L"InvalidUriText"), eventArgs.Uri());
+        }
+    }
+
+    // Method Description:
+    // - Opens up a dialog box explaining why we could not open a URI
+    // Arguments:
+    // - The reason (unsupported scheme, invalid uri, potentially more in the future)
+    // - The uri
+    void TerminalPage::_ShowCouldNotOpenDialog(winrt::hstring reason, winrt::hstring uri)
+    {
+        if (auto presenter{ _dialogPresenter.get() })
+        {
+            // FindName needs to be called first to actually load the xaml object
+            auto unopenedUriDialog = FindName(L"CouldNotOpenUriDialog").try_as<WUX::Controls::ContentDialog>();
+
+            // Insert the reason and the URI
+            CouldNotOpenUriReason().Text(reason);
+            UnopenedUri().Text(uri);
+
+            // Show the dialog
+            presenter.ShowDialog(unopenedUriDialog);
         }
-        CATCH_LOG();
     }
 
     // Method Description:

src/cascadia/TerminalApp/TerminalPage.h

@@ -173,6 +173,7 @@ namespace winrt::TerminalApp::implementation
                                                           const Microsoft::Terminal::TerminalControl::PasteFromClipboardEventArgs eventArgs);
 
         void _OpenHyperlinkHandler(const IInspectable sender, const Microsoft::Terminal::TerminalControl::OpenHyperlinkEventArgs eventArgs);
+        void _ShowCouldNotOpenDialog(winrt::hstring reason, winrt::hstring uri);
         bool _CopyText(const bool singleLine, const Windows::Foundation::IReference<Microsoft::Terminal::TerminalControl::CopyFormat>& formats);
 
         void _PasteText();

src/cascadia/TerminalApp/TerminalPage.xaml

@@ -68,6 +68,20 @@ the MIT License. See LICENSE in the project root for license information. -->
             DefaultButton="Primary">
         </ContentDialog>
 
+        <ContentDialog
+            x:Load="False"
+            x:Name="CouldNotOpenUriDialog"
+            x:Uid="CouldNotOpenUriDialog"
+            DefaultButton="Primary">
+            <TextBlock IsTextSelectionEnabled="True">
+                <Run x:Name="CouldNotOpenUriReason" /> <LineBreak />
+                <Run
+                    x:Name="UnopenedUri"
+                    FontFamily="Cascadia Mono">
+                </Run>
+            </TextBlock>
+        </ContentDialog>
+
         <local:CommandPalette
             x:Name="CommandPalette"
             Grid.Row="1"