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egui-inspect-derive/Cargo.toml

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+[package]
+name = "egui-inspect-derive"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+proc-macro = true
+
+[dependencies]
+quote = "1.0.26"
+proc-macro2 = "1.0.56"

egui-inspect-derive/src/lib.rs

@@ -0,0 +1,15 @@
+use proc_macro::TokenStream;
+use quote::quote;
+
+#[proc_macro_derive(Inspect)]
+pub fn derive_inspect(input: TokenStream) -> TokenStream {
+    let expanded = quote! {
+        impl Inspect for GameState {
+            fn inspect_mut(&mut self) {
+                output_mut(|o| o.copied_text = format!(""));
+                output_mut(|o| o.copied_text = format!("{:?}", self.tile_db));
+            }
+        }
+    };
+    proc_macro::TokenStream::from(expanded)
+}