Test message 123!

src/debug.rs

@@ -0,0 +1,28 @@
+use std::cell::RefCell;
+use std::time::Instant;
+
+thread_local! {
+    static ENABLED: RefCell<bool>        = RefCell::new(false);
+    static LOG:     RefCell<Vec<String>> = RefCell::new(Vec::new());
+    static T0:      RefCell<Option<Instant>> = RefCell::new(None);
+}
+
+pub fn enable() {
+    ENABLED.with(|e| *e.borrow_mut() = true);
+    T0.with(|t|  *t.borrow_mut() = Some(Instant::now()));
+}
+
+pub fn is_enabled() -> bool {
+    ENABLED.with(|e| *e.borrow())
+}
+
+pub fn log(msg: impl Into<String>) {
+    if !is_enabled() { return; }
+    let ms = T0.with(|t| t.borrow().map(|i| i.elapsed().as_millis()).unwrap_or(0));
+    LOG.with(|l| l.borrow_mut().push(format!("{ms:>6}ms  {}", msg.into())));
+}
+
+/// Drain and return all collected entries (empties the internal buffer).
+pub fn take() -> Vec<String> {
+    LOG.with(|l| std::mem::take(&mut *l.borrow_mut()))
+}