feat: pretify_log utilit

package/prettify-log/src/main.rs

@@ -0,0 +1,42 @@
+use std::io::{self, BufRead};
+use serde_json::Value;
+
+/// Finds the substring from the first '{' to its matching '}', handling nested braces.
+fn find_json_block(line: &str) -> Option<(usize, usize)> {
+    let start = line.find('{')?;
+    let mut brace_count = 0;
+    for (i, ch) in line[start..].char_indices() {
+        if ch == '{' {
+            brace_count += 1;
+        } else if ch == '}' {
+            brace_count -= 1;
+            if brace_count == 0 {
+                // Return the byte-range of the entire JSON block
+                return Some((start, start + i + 1));
+            }
+        }
+    }
+    None
+}
+
+fn main() -> io::Result<()> {
+    let stdin = io::stdin();
+
+    for line_result in stdin.lock().lines() {
+        let line = line_result?;
+        if let Some((start, end)) = find_json_block(&line) {
+            let candidate = &line[start..end];
+            if let Ok(json) = serde_json::from_str::<Value>(candidate) {
+                let pretty = serde_json::to_string_pretty(&json).unwrap();
+                let prefix = &line[..start];
+                let suffix = &line[end..];
+                println!("{}{}{}", prefix, pretty, suffix);
+                continue;
+            }
+        }
+        // If no valid JSON found, print as-is
+        println!("{}", line);
+    }
+
+    Ok(())
+}