add bindgen version to file header (#490)

* add wit-bindgen pkg version to file headers

Signed-off-by: Jiaxiao Zhou <jiazho@microsoft.com>

* fmt

Signed-off-by: Jiaxiao Zhou <jiazho@microsoft.com>

---------

Signed-off-by: Jiaxiao Zhou <jiazho@microsoft.com>

Author: Mossaka

crates/gen-guest-c/src/lib.rs

@@ -259,8 +259,12 @@ impl WorldGenerator for C {
                ",
             );
         }
-
+        let version = env!("CARGO_PKG_VERSION");
         let mut h_str = wit_bindgen_core::Source::default();
+        uwriteln!(
+            h_str,
+            "// Generated by `wit-bindgen` {version}. DO NOT EDIT!"
+        );
 
         uwrite!(
             h_str,
@@ -283,6 +287,10 @@ impl WorldGenerator for C {
         }
 
         let mut c_str = wit_bindgen_core::Source::default();
+        uwriteln!(
+            c_str,
+            "// Generated by `wit-bindgen` {version}. DO NOT EDIT!"
+        );
         uwriteln!(c_str, "#include \"{snake}.h\"");
         if c_str.len() > 0 {
             c_str.push_str("\n");

crates/gen-guest-rust/src/lib.rs

@@ -113,6 +113,11 @@ impl RustWasm {
 
 impl WorldGenerator for RustWasm {
     fn preprocess(&mut self, resolve: &Resolve, _world: WorldId) {
+        let version = env!("CARGO_PKG_VERSION");
+        uwriteln!(
+            self.src,
+            "// Generated by `wit-bindgen` {version}. DO NOT EDIT!"
+        );
         self.types.analyze(resolve);
     }
 

crates/gen-guest-teavm-java/src/lib.rs

@@ -179,7 +179,9 @@ impl WorldGenerator for TeaVmJava {
         let package = format!("wit_{}", world.name.to_snake_case());
         let name = world.name.to_upper_camel_case();
 
+        let version = env!("CARGO_PKG_VERSION");
         let mut src = String::new();
+        uwriteln!(src, "// Generated by `wit-bindgen` {version}. DO NOT EDIT!");
 
         uwrite!(
             src,
@@ -361,7 +363,8 @@ impl WorldGenerator for TeaVmJava {
                 .join("\n");
 
             let body = format!(
-                "package {package};
+                "// Generated by `wit-bindgen` {version}. DO NOT EDIT!
+                 package {package};
 
                  {IMPORTS}
 
@@ -386,7 +389,8 @@ impl WorldGenerator for TeaVmJava {
                 .join("\n");
 
             let body = format!(
-                "package {package};
+                "// Generated by `wit-bindgen` {version}. DO NOT EDIT!
+                 package {package};
 
                  {IMPORTS}