[PATCH 12/19] rust/qobject: add Display/Debug

[Paolo Bonzini <pbonzini@redhat.com>]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 rust/util/src/qobject/mod.rs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/rust/util/src/qobject/mod.rs b/rust/util/src/qobject/mod.rs
index 292a3c9c238..38b98fdb1e8 100644
--- a/rust/util/src/qobject/mod.rs
+++ b/rust/util/src/qobject/mod.rs
@@ -12,6 +12,7 @@
 mod serialize;
 mod serializer;
 
+use core::fmt::{self, Debug, Display};
 use std::{
     cell::UnsafeCell,
     ffi::{c_char, CString},
@@ -256,6 +257,33 @@ fn drop(&mut self) {
     }
 }
 
+impl Display for QObject {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        // replace with a plain serializer?
+        match_qobject! { (self) =>
+            () => write!(f, "QNull"),
+            bool(b) => write!(f, "QBool({})", if b { "true" } else { "false" }),
+            i64(n) => write!(f, "QNumI64({})", n),
+            u64(n) => write!(f, "QNumU64({})", n),
+            f64(n) => write!(f, "QNumDouble({})", n),
+            CStr(s) => write!(f, "QString({})", s.to_str().unwrap_or("bad CStr")),
+            QList(_) => write!(f, "QList"),
+            QDict(_) => write!(f, "QDict"),
+        }
+    }
+}
+
+impl Debug for QObject {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let val = self.to_string();
+        f.debug_struct("QObject")
+            .field("ptr", &self.0.get())
+            .field("refcnt()", &self.refcnt())
+            .field("to_string()", &val)
+            .finish()
+    }
+}
+
 macro_rules! match_qobject {
     (@internal ($qobj:expr) =>
         $(() => $unit:expr,)?
-- 
2.51.0