fix: implement debug for hasher and fix md5 update method

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/meta_plugin/digest.rs

@@ -1,18 +1,32 @@
 use sha2::{Digest, Sha256, Sha512};
 use md5;
 use crate::meta_plugin::MetaPlugin;
+use std::fmt;
 
-#[derive(Debug, Clone)]
+#[derive(Clone)]
 enum Hasher {
     Md5(md5::Context),
     Sha256(Sha256),
     Sha512(Sha512),
 }
 
+// Implement Debug manually since md5::Context doesn't implement it
+impl fmt::Debug for Hasher {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Hasher::Md5(_) => write!(f, "Hasher::Md5"),
+            Hasher::Sha256(_) => write!(f, "Hasher::Sha256"),
+            Hasher::Sha512(_) => write!(f, "Hasher::Sha512"),
+        }
+    }
+}
+
 impl Hasher {
     fn update(&mut self, data: &[u8]) {
         match self {
-            Hasher::Md5(hasher) => hasher.update(data),
+            Hasher::Md5(hasher) => {
+                hasher.write(data);
+            },
             Hasher::Sha256(hasher) => hasher.update(data),
             Hasher::Sha512(hasher) => hasher.update(data),
         }