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fold: add a benchmark #8801

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Merged
sylvestre merged 1 commit into from
Oct 4, 2025
Merged

fold: add a benchmark #8801

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2 changes: 2 additions & 0 deletions Cargo.lock
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9 changes: 9 additions & 0 deletions src/uu/fold/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,15 @@ clap = { workspace = true }
uucore = { workspace = true }
fluent = { workspace = true }

[dev-dependencies]
divan = { workspace = true }
tempfile = { workspace = true }
uucore = { workspace = true, features = ["benchmark"] }

[[bin]]
name = "fold"
path = "src/main.rs"

[[bench]]
name = "fold_bench"
harness = false
51 changes: 51 additions & 0 deletions src/uu/fold/benches/fold_bench.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,51 @@
// This file is part of the uutils coreutils package.
//
// For the full copyright and license information, please view the LICENSE
// file that was distributed with this source code.

use divan::{Bencher, black_box};
use std::fmt::Write;
use uu_fold::uumain;
use uucore::benchmark::{create_test_file, run_util_function};

/// Benchmark folding many short lines
#[divan::bench(args = [100_000])]
fn fold_many_lines(bencher: Bencher, num_lines: usize) {
let temp_dir = tempfile::tempdir().unwrap();
// Create long lines that need folding
let data = (0..num_lines)
.fold(String::new(), |mut acc, i| {
writeln!(&mut acc, "This is a very long line number {i} that definitely needs to be folded at the default width of 80 columns").unwrap();
acc
});
let file_path = create_test_file(data.as_bytes(), temp_dir.path());
let file_path_str = file_path.to_str().unwrap();

bencher.bench(|| {
black_box(run_util_function(uumain, &[file_path_str]));
});
}

/// Benchmark folding with custom width
#[divan::bench(args = [50_000])]
fn fold_custom_width(bencher: Bencher, num_lines: usize) {
let temp_dir = tempfile::tempdir().unwrap();
let data = (0..num_lines).fold(String::new(), |mut acc, i| {
writeln!(
&mut acc,
"Line {i} with enough text to exceed width 40 characters and require folding"
)
.unwrap();
acc
});
let file_path = create_test_file(data.as_bytes(), temp_dir.path());
let file_path_str = file_path.to_str().unwrap();

bencher.bench(|| {
black_box(run_util_function(uumain, &["-w", "40", file_path_str]));
});
}

fn main() {
divan::main();
}
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