refactor(examples): migrate renderers to return RenderResult and add

std::io::Write import

Replace r_println!/r_print! macro usage across all example renderers
with
explicit RenderResult construction using std::io::Write, enabling more
flexible output handling and reducing reliance on macro-side effects.

1 files changed, 8 insertions, 3 deletions

diff --git a/examples/example-pathfinder/src/sub/mod.rs b/examples/example-pathfinder/src/sub/mod.rs
index ef10a75..6d15930 100644
--- a/examples/example-pathfinder/src/sub/mod.rs
+++ b/examples/example-pathfinder/src/sub/mod.rs
@@ -1,5 +1,6 @@
-use mingling::prelude::*;
 use crate::Next;
+use mingling::prelude::*;
+use std::io::Write;
 
 dispatcher!("greet", CMDGreet => EntryGreet);
 pack!(ResultName = String);
@@ -15,7 +16,11 @@ pub fn handle_greet(args: EntryGreet) -> Next {
     name
 }
 
+/// Renders the name.
 #[renderer]
-pub fn render_name(name: ResultName) {
-    r_println!("Hello, {}!", *name);
+// But renderers cannot use the `async` keyword
+pub fn render_name(name: ResultName) -> RenderResult {
+    let mut render_result = RenderResult::new();
+    writeln!(render_result, "Hello, {}!", *name).ok();
+    render_result
 }