Use internal Decode helper in a few more places

.github/workflows/build.yml

@@ -154,7 +154,6 @@ jobs:
           cargo clippy -p test_event &&
           cargo clippy -p test_handles &&
           cargo clippy -p test_helpers &&
-          cargo clippy -p test_hstring &&
           cargo clippy -p test_identity &&
           cargo clippy -p test_implement &&
           cargo clippy -p test_interface &&

.github/workflows/test.yml

@@ -138,7 +138,6 @@ jobs:
           cargo test --target ${{ matrix.target }} -p test_event &&
           cargo test --target ${{ matrix.target }} -p test_handles &&
           cargo test --target ${{ matrix.target }} -p test_helpers &&
-          cargo test --target ${{ matrix.target }} -p test_hstring &&
           cargo test --target ${{ matrix.target }} -p test_identity &&
           cargo test --target ${{ matrix.target }} -p test_implement &&
           cargo test --target ${{ matrix.target }} -p test_interface &&

crates/libs/bindgen/src/replacements/bstr.rs

@@ -87,11 +87,7 @@ pub fn gen() -> TokenStream {
         }
         impl ::core::fmt::Display for BSTR {
             fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
-                use ::core::fmt::Write;
-                for c in ::core::char::decode_utf16(self.as_wide().iter().cloned()) {
-                    f.write_char(c.map_err(|_| ::core::fmt::Error)?)?
-                }
-                Ok(())
+                ::core::write!(f, "{}", ::windows::core::Decode(|| ::core::char::decode_utf16(self.as_wide().iter().cloned())))
             }
         }
         impl ::core::fmt::Debug for BSTR {

crates/libs/windows/src/Windows/Win32/Foundation/mod.rs

@@ -293,11 +293,7 @@ impl ::core::default::Default for BSTR {
 }
 impl ::core::fmt::Display for BSTR {
     fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
-        use core::fmt::Write;
-        for c in ::core::char::decode_utf16(self.as_wide().iter().cloned()) {
-            f.write_char(c.map_err(|_| ::core::fmt::Error)?)?
-        }
-        Ok(())
+        ::core::write!(f, "{}", ::windows::core::Decode(|| ::core::char::decode_utf16(self.as_wide().iter().cloned())))
     }
 }
 impl ::core::fmt::Debug for BSTR {

crates/libs/windows/src/core/bindings.rs

@@ -1227,11 +1227,7 @@ impl ::core::default::Default for BSTR {
 }
 impl ::core::fmt::Display for BSTR {
     fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
-        use core::fmt::Write;
-        for c in ::core::char::decode_utf16(self.as_wide().iter().cloned()) {
-            f.write_char(c.map_err(|_| ::core::fmt::Error)?)?
-        }
-        Ok(())
+        ::core::write!(f, "{}", ::windows::core::Decode(|| ::core::char::decode_utf16(self.as_wide().iter().cloned())))
     }
 }
 impl ::core::fmt::Debug for BSTR {

crates/libs/windows/src/core/strings/hstring.rs

@@ -134,11 +134,7 @@ unsafe impl Sync for HSTRING {}
 
 impl core::fmt::Display for HSTRING {
     fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
-        use core::fmt::Write;
-        for c in core::char::decode_utf16(self.as_wide().iter().cloned()) {
-            f.write_char(c.unwrap_or(core::char::REPLACEMENT_CHARACTER))?
-        }
-        Ok(())
+        write!(f, "{}", Decode(|| core::char::decode_utf16(self.as_wide().iter().cloned())))
     }
 }
 

crates/libs/windows/src/core/strings/mod.rs

@@ -16,12 +16,15 @@ pub use pwstr::*;
 use super::*;
 
 extern "C" {
+    #[doc(hidden)]
     pub fn strlen(s: PCSTR) -> usize;
+    #[doc(hidden)]
     pub fn wcslen(s: PCWSTR) -> usize;
 }
 
 /// An internal helper for decoding an iterator of chars and displaying them
-struct Decode<F>(F);
+#[doc(hidden)]
+pub struct Decode<F>(pub F);
 
 impl<F, R, E> core::fmt::Display for Decode<F>
 where

crates/tests/core/tests/hstrings.rs

@@ -36,6 +36,13 @@ fn display_format() {
     assert!(format!("{}", value) == "Hello world");
 }
 
+#[test]
+fn display_invalid_format() {
+    let s = HSTRING::from_wide(&[0xD834, 0xDD1E, 0x006d, 0x0075, 0x0073, 0xDD1E, 0x0069, 0x0063, 0xD834]);
+    let d = format!("{}", s);
+    assert_eq!(d, "𝄞mus�ic�");
+}
+
 #[test]
 fn debug_format() {
     let value = HSTRING::from("Hello world");