Initial commit

.gitignore

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+/target
+**/*.rs.bk

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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+version = "0.1.6"
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+
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+name = "crossbeam-channel"
+version = "0.3.8"
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+dependencies = [
+ "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
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+dependencies = [
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+name = "smallvec"
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+dependencies = [
+ "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
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+name = "stopwatch"
+version = "0.1.0"
+dependencies = [
+ "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
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+]
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Cargo.toml

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+[package]
+name = "stopwatch"
+version = "0.1.0"
+authors = ["Marcel Schneider <marcel@webschneider.org>"]
+edition = "2018"
+
+[dependencies]
+crossbeam-channel = "0.3"

src/main.rs

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+//! stopwatch is a simple CLI stopwatch
+
+use crossbeam_channel::tick;
+use std::io::{stdout, Write};
+use std::time::{Duration, Instant};
+
+#[macro_use]
+extern crate crossbeam_channel;
+
+fn main() {
+    let out = stdout();
+    let mut out = out.lock();
+
+    // 30 fps should be enough
+    let step_duration = Duration::from_millis(1000 / 30);
+    let start = Instant::now();
+    let ticker = tick(step_duration);
+
+    loop {
+        select! {
+            recv(ticker) -> now => {
+                let elapsed = now.unwrap().duration_since(start);
+                let secs = elapsed.as_secs();
+                let millis = elapsed.subsec_millis();
+                write!(out, "\r[2K").unwrap();
+                write!(out, "{:02}:{:02}:{:03}", secs/60, secs % 60, millis).unwrap();
+                out.flush().unwrap();
+            }
+        }
+    }
+}