track timing information for commands

1 files changed, 18 insertions, 0 deletions

diff --git a/src/util.rs b/src/util.rs
index d792b91..649888c 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -3,3 +3,21 @@ pub type Mutex<T> = async_std::sync::Arc<async_std::sync::Mutex<T>>;
 pub fn mutex<T>(t: T) -> Mutex<T> {
     async_std::sync::Arc::new(async_std::sync::Mutex::new(t))
 }
+
+pub fn format_duration(dur: std::time::Duration) -> String {
+    let secs = dur.as_secs();
+    let nanos = dur.subsec_nanos();
+    if secs > 60 {
+        let mins = secs / 60;
+        let secs = secs - mins * 60;
+        format!("{}m{}s", mins, secs)
+    } else if secs > 0 {
+        format!("{}.{:03}s", secs, nanos / 1_000_000)
+    } else if nanos >= 1_000_000 {
+        format!("{}ms", nanos / 1_000_000)
+    } else if nanos >= 1_000 {
+        format!("{}us", nanos / 1_000)
+    } else {
+        format!("{}ns", nanos)
+    }
+}