Add benchmarking with criterion

tr/Cargo.toml

@@ -18,3 +18,10 @@ default = ["gettext-rs"]
 lazy_static = "1.2"
 gettext-rs = { version = "0.7", optional = true, features = ["gettext-system"] }
 gettext = { version = "0.4", optional = true }
+
+[dev-dependencies]
+criterion = "0.5"
+
+[[bench]]
+name = "my_bench"
+harness = false

tr/benches/my_bench.rs

@@ -0,0 +1,38 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use tr::tr;
+
+pub fn short_literal(c: &mut Criterion) {
+    c.bench_function("short_literal", |b| b.iter(|| {
+        tr!("Hello");
+    }));
+}
+
+pub fn long_literal(c: &mut Criterion) {
+    c.bench_function("long_literal", |b| b.iter(|| {
+        tr!("Hello, world! This is a longer sentence but without argument markers. That is all for now, thank you for reading.");
+    }));
+}
+
+pub fn short_argument(c: &mut Criterion) {
+    c.bench_function("short_argument", |b| b.iter(|| {
+        tr!("Hello {}!", black_box("world"));
+    }));
+}
+
+pub fn long_argument(c: &mut Criterion) {
+    c.bench_function("long_argument", |b| b.iter(|| {
+        tr!("Hello {} and {} and {} and {} and {} and {} and {} and finally {}!",
+            black_box("Mercury"),
+            black_box("Venus"),
+            black_box("Earth"),
+            black_box("Mars"),
+            black_box("Jupiter"),
+            black_box("Saturn"),
+            black_box("Uranus"),
+            black_box("Neptune"),
+        );
+    }));
+}
+
+criterion_group!(benches, short_literal, long_literal, short_argument, long_argument);
+criterion_main!(benches);