add time, iff!

src/lib.rs

@@ -13,6 +13,15 @@ pub mod util_cmd;
 pub mod util_msg;
 pub mod util_size;
 pub mod util_file;
+pub mod util_time;
+
+/// iff!(condition, result_when_true, result_when_false)
+#[macro_export]
+macro_rules! iff {
+    ($c:expr, $t:expr, $f:expr) => {
+        if $c { $t } else { $f }
+    };
+}
 
 pub type XResult<T> = Result<T, Box<dyn std::error::Error>>;