Implement Display trait for Target in pmp-macro-misc to enhance flag formatting and readability

crates/pmp-macro/crates/pmp-macro-misc/src/target.rs

@@ -1,3 +1,4 @@
+use std::fmt::{ Display, Formatter };
 use bitflags::bitflags;
 
 bitflags!
@@ -37,3 +38,38 @@ bitflags!
         const ALL = u16::MAX;
     }
 }
+
+impl Display for Target
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result
+    {
+        let mut first = true;
+
+        macro_rules! write_flag
+        {
+            ($flag:ident) =>
+            {
+                if self.contains(Target::$flag)
+                {
+                    if !first { write!(f, " | ")?; }
+                    write!(f, "Target::{}", stringify!($flag))?;
+                    first = false;
+                }
+            };
+        }
+
+        write_flag!(CLASS);
+        write_flag!(INTERFACE);
+        write_flag!(TRAIT);
+        write_flag!(ENUM);
+        write_flag!(METHOD);
+        write_flag!(FUNCTION);
+        write_flag!(PROPERTY);
+        write_flag!(CONSTANT);
+        write_flag!(PARAMETER);
+
+        if first { write!(f, "Target::ALL")?; }
+
+        Ok(())
+    }
+}