Vendor things

third-party/vendor/diff/benches/benches.rs

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+extern crate criterion;
+extern crate diff;
+
+use criterion::Criterion;
+
+criterion::criterion_group!(benches, bench_slice, bench_chars, bench_real_world);
+criterion::criterion_main!(benches);
+
+fn bench_slice(c: &mut Criterion) {
+    c.bench_function("empty", |b| {
+        let slice = [0u8; 0];
+        b.iter(|| ::diff::slice(&slice, &slice));
+    });
+
+    c.bench_function("10 equal items", |b| {
+        let slice = [0u8; 10];
+        b.iter(|| ::diff::slice(&slice, &slice));
+    });
+
+    c.bench_function("10 non-equal items", |b| {
+        let (left, right) = ([0u8; 10], [1u8; 10]);
+        b.iter(|| ::diff::slice(&left, &right));
+    });
+
+    c.bench_function("100 equal items", |b| {
+        let slice = [0u8; 100];
+        b.iter(|| ::diff::slice(&slice, &slice));
+    });
+
+    c.bench_function("100 non-equal items", |b| {
+        let (left, right) = ([0u8; 100], [1u8; 100]);
+        b.iter(|| ::diff::slice(&left, &right));
+    });
+
+    c.bench_function("1000 equal items", |b| {
+        let slice = [0u8; 1000];
+        b.iter(|| ::diff::slice(&slice, &slice));
+    });
+
+    c.bench_function("1000 non-equal items", |b| {
+        let (left, right) = ([0u8; 1000], [1u8; 1000]);
+        b.iter(|| ::diff::slice(&left, &right));
+    });
+}
+
+fn bench_chars(c: &mut Criterion) {
+    c.bench_function("1024 byte string, last 256 different", |b| {
+        let left = "?".repeat(768) + &"_".repeat(256);
+        let right = "?".repeat(768) + &"!".repeat(256);
+        assert_eq!(left.len(), right.len());
+        b.iter(|| ::diff::chars(&left, &right));
+    });
+}
+
+fn bench_real_world(c: &mut Criterion) {
+    let gitignores = std::fs::read_to_string("tests/data/gitignores.txt")
+        .unwrap()
+        .split("!!!")
+        .filter_map(|str| (!str.is_empty()).then(|| str.into()))
+        .collect::<Vec<String>>();
+
+    c.bench_function("diff::lines on gitignore files from rust-lang/rust", |b| {
+        b.iter(|| {
+            for (i, left) in gitignores.iter().enumerate() {
+                // diff with previous 3, itself, and next 3
+                for right in gitignores[i.saturating_sub(3)..(i + 3).min(gitignores.len())].iter() {
+                    ::diff::lines(&left, &right);
+                }
+            }
+        })
+    });
+
+    c.bench_function("diff::chars on gitignore files from rust-lang/rust", |b| {
+        b.iter(|| {
+            for (i, left) in gitignores.iter().enumerate() {
+                // diff with previous 2, itself, and next 2
+                for right in gitignores[i.saturating_sub(2)..(i + 2).min(gitignores.len())].iter() {
+                    ::diff::chars(&left, &right);
+                }
+            }
+        })
+    });
+}