add prettier progress with `indicatif`

Cargo.toml

@@ -6,6 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+indicatif = "0.17.8"
 
 [dev-dependencies]
 clap = { version = "4.5.4", features = ["derive"] }

README.md

@@ -16,12 +16,13 @@ cargo run --release --example arithmetic -- --nb-measurements 1000
 the output of the snippet above will have two parts:
 
 ### on STDERR
-the benchmarking process for debugging
+the benchmarking process will show progress bars while running and the details
+of each benchmark will be shown as follows
 ```text
-bencher: arithmetic, label: addition [   10/10]
-bencher: arithmetic, label: substraction [   10/10]
-bencher: arithmetic, label: multiplication [   10/10]
-bencher: random, label: sampling [   10/10]
+bencher: arithmetic, label: addition
+bencher: arithmetic, label: substraction
+bencher: arithmetic, label: multiplication
+bencher: random, label: sampling
 ```
 
 ### on STDOUT

src/lib.rs

@@ -2,6 +2,8 @@
 
 use std::time::{Duration, Instant};
 
+use indicatif::{ProgressBar, ProgressStyle};
+
 /// hold information about the benchmark to run
 pub struct Bencher {
     /// the number of times each bench should run, the higher this number the lower the variance
@@ -37,20 +39,16 @@ pub fn bench<F>(b: &Bencher, label: &str, mut f: F)
 where
     F: FnMut() -> Duration,
 {
-    let mut times = vec![];
-    for i in 0..b.nb_measurements {
-        eprint!(
-            "bencher: {}, label: {} [{:>width$}/{}]\r",
-            b.name,
-            label,
-            i + 1,
-            b.nb_measurements,
-            width = format!("{}", b.nb_measurements).len()
-        );
+    eprintln!("bencher: {}, label: {}", b.name, label,);
+    let pb = ProgressBar::new(b.nb_measurements as u64)
+        .with_style(ProgressStyle::default_bar().progress_chars("#*-"));
 
+    let mut times = vec![];
+    for _ in 0..b.nb_measurements {
         times.push(f().as_nanos());
+
+        pb.inc(1);
     }
-    eprintln!();
 
     println!(
         r#"{{"label": "{}", "name": "{}", "times": {:?}}}"#,