feat: initialize cookie once and use set_flags for subsequent operations

Co-authored-by: aider (openai/andrew/openrouter/qwen/qwen3-coder) <aider@aider.chat>

src/meta_plugin/magic.rs

@@ -28,11 +28,10 @@ impl MagicFileMetaPlugin {
     }
 
     fn get_magic_result(&self, flags: CookieFlags) -> io::Result<String> {
-        // Create a new cookie with the specific flags for this request
+        // Use the existing cookie and just change flags
-        let cookie = Cookie::open(flags)
+        if let Some(cookie) = &self.cookie {
-            .map_err(|e| io::Error::new(io::ErrorKind::Other, format!("Failed to open magic cookie: {}", e)))?;
+            cookie.set_flags(flags)
-        cookie.load(&[] as &[&str])
+                .map_err(|e| io::Error::new(io::ErrorKind::Other, format!("Failed to set magic flags: {}", e)))?;
-            .map_err(|e| io::Error::new(io::ErrorKind::Other, format!("Failed to load magic database: {}", e)))?;
 
             let result = cookie.buffer(&self.buffer)
                 .map_err(|e| io::Error::new(io::ErrorKind::Other, format!("Failed to analyze buffer: {}", e)))?;
@@ -50,6 +49,9 @@ impl MagicFileMetaPlugin {
             };
 
             Ok(cleaned.to_string())
+        } else {
+            Err(io::Error::new(io::ErrorKind::Other, "Magic cookie not initialized"))
+        }
     }
 
     fn save_all_magic_metadata(&mut self) -> Result<()> {
@@ -109,6 +111,13 @@ impl MetaPlugin for MagicFileMetaPlugin {
         // Store raw pointer to connection - unsafe but necessary for this design
         self.conn = Some(conn as *const _ as *mut Connection);
         
+        // Initialize the magic cookie once
+        let cookie = Cookie::open(Default::default())
+            .map_err(|e| anyhow::anyhow!("Failed to open magic cookie: {}", e))?;
+        cookie.load(&[] as &[&str])
+            .map_err(|e| anyhow::anyhow!("Failed to load magic database: {}", e))?;
+        self.cookie = Some(cookie);
+        
         Ok(())
     }