style: Optimize stub proxy logging and cleanup nvim-core JSON-RPC response boilerplate

stub/src/logger.rs

@@ -0,0 +1,30 @@
+use std::sync::LazyLock;
+use regex::Regex;
+
+static ID_REGEX: LazyLock<Regex> = LazyLock::new(|| Regex::new(r#""id"\s*:\s*([^,}]+)"#).unwrap());
+static METHOD_REGEX: LazyLock<Regex> = LazyLock::new(|| Regex::new(r#""method"\s*:\s*"([^"]+)""#).unwrap());
+static TOOL_REGEX: LazyLock<Regex> = LazyLock::new(|| Regex::new(r#""name"\s*:\s*"([^"]+)""#).unwrap());
+static ERROR_REGEX: LazyLock<Regex> = LazyLock::new(|| Regex::new(r#""error"\s*:\s*\{"#).unwrap());
+static IS_ERROR_REGEX: LazyLock<Regex> = LazyLock::new(|| Regex::new(r#""isError"\s*:\s*true"#).unwrap());
+
+pub fn extract_log_prefix(json_str: &str, is_response: bool) -> String {
+    let id = ID_REGEX.captures(json_str).and_then(|c| c.get(1)).map(|m| m.as_str()).unwrap_or("null");
+    
+    if is_response {
+        let is_error = ERROR_REGEX.is_match(json_str) || IS_ERROR_REGEX.is_match(json_str);
+        return format!("Response id={} [Error: {}]", id, is_error);
+    }
+    
+    let method = METHOD_REGEX.captures(json_str).and_then(|c| c.get(1)).map(|m| m.as_str()).unwrap_or("");
+    
+    if method == "tools/call" {
+        let tool = TOOL_REGEX.captures(json_str).and_then(|c| c.get(1)).map(|m| m.as_str()).unwrap_or("unknown");
+        format!("ToolCall[{}] id={}", tool, id)
+    } else if !method.is_empty() {
+        format!("Request[{}] id={}", method, id)
+    } else if id != "null" {
+        format!("Response id={}", id)
+    } else {
+        "Message".to_string()
+    }
+}