Add default error handling methods to ProgramCollect trait

The trait now includes `build_renderer_not_found` and
`build_dispatcher_not_found`
methods for constructing error outputs. The macro generates
implementations
that create appropriate error types, removing hardcoded enum variants.

2 files changed, 4 insertions, 3 deletions

diff --git a/mingling_core/src/program.rs b/mingling_core/src/program.rs
index 1c8c0b4..ffba17e 100644
--- a/mingling_core/src/program.rs
+++ b/mingling_core/src/program.rs
@@ -88,6 +88,8 @@ where
 
 pub trait ProgramCollect {
     type Enum: Display;
+    fn build_renderer_not_found(member_id: Self::Enum) -> AnyOutput<Self::Enum>;
+    fn build_dispatcher_not_found(args: Vec<String>) -> AnyOutput<Self::Enum>;
     fn render(any: AnyOutput<Self::Enum>, r: &mut RenderResult);
     fn do_chain(
         any: AnyOutput<Self::Enum>,
diff --git a/mingling_core/src/program/exec.rs b/mingling_core/src/program/exec.rs
index cdbb2b0..bf025fd 100644
--- a/mingling_core/src/program/exec.rs
+++ b/mingling_core/src/program/exec.rs
@@ -28,7 +28,7 @@ where
         }
         Err(ProgramInternalExecuteError::DispatcherNotFound) => {
             // No matching Dispatcher is found
-            return Err(ProgramInternalExecuteError::DispatcherNotFound);
+            current = C::build_dispatcher_not_found(program.args);
         }
         Err(e) => return Err(e),
     };
@@ -51,8 +51,7 @@ where
             }
             // No renderer exists
             else {
-                let renderer_name = current.member_id.to_string();
-                return Err(ProgramInternalExecuteError::RendererNotFound(renderer_name));
+                C::build_renderer_not_found(current.member_id)
             }
         };
     }