don't try to open unsupported types

src/gopher.rs

@@ -53,6 +53,13 @@ impl Type {
 }
 
 impl Type {
+    pub fn is_supported(self) -> bool {
+        match self {
+            Type::CSOEntity | Type::Mirror | Type::Telnet3270 => false,
+            _ => true,
+        }
+    }
+
     pub fn to_char(self) -> Option<char> {
         Some(match self {
             Type::Text => '0',

src/menu.rs

@@ -167,8 +167,8 @@ impl Menu {
                 Type::HTML => push!("92", name),
                 Type::Error => push!("91", name),
                 Type::Telnet => push!("4;97;90", name),
-                Type::Telnet3270 | Type::Mirror | Type::CSOEntity => push!("107;30", name),
                 typ if typ.is_download() => push!("4;97", name),
+                typ if !typ.is_supported() => push!("107;91", name),
                 _ => push!("0", name),
             }
             out.push('\n');
@@ -503,6 +503,7 @@ impl Menu {
                 }
                 Type::Error => Action::Error(line.name.to_string()),
                 Type::Telnet => Action::Error("Telnet support coming soon".into()),
+                t if !t.is_supported() => Action::Error(format!("{:?} not supported", t)),
                 _ => Action::Open(line.name.to_string(), url),
             }
         } else {