add first benchmark

bench/benches/insert.rs

@@ -0,0 +1,57 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use tui_textarea::{Input, Key, TextArea};
+use tui_textarea_bench::dummy_terminal;
+
+const LOREM: &[&str] = &[
+    "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do",
+    "eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim",
+    "ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut",
+    "aliquip ex ea commodo consequat. Duis aute irure dolor in",
+    "reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla",
+    "pariatur. Excepteur sint occaecat cupidatat non proident, sunt in",
+    "culpa qui officia deserunt mollit anim id est laborum.",
+];
+
+#[inline]
+fn append_lorem(repeat: usize) -> usize {
+    let mut textarea = TextArea::default();
+    let mut term = dummy_terminal();
+    for _ in 0..repeat {
+        for line in LOREM {
+            for c in line.chars() {
+                textarea.input(Input {
+                    key: Key::Char(c),
+                    ctrl: false,
+                    alt: false,
+                });
+            }
+            term.draw(|f| {
+                f.render_widget(textarea.widget(), f.size());
+            })
+            .unwrap();
+        }
+        textarea.input(Input {
+            key: Key::Enter,
+            ctrl: false,
+            alt: false,
+        });
+        term.draw(|f| {
+            f.render_widget(textarea.widget(), f.size());
+        })
+        .unwrap();
+    }
+    textarea.lines().len()
+}
+
+fn append(c: &mut Criterion) {
+    c.bench_function("append::1_lorem", |b| b.iter(|| black_box(append_lorem(1))));
+    c.bench_function("append::10_lorem", |b| {
+        b.iter(|| black_box(append_lorem(10)))
+    });
+    c.bench_function("append::100_lorem", |b| {
+        b.iter(|| black_box(append_lorem(100)))
+    });
+}
+
+criterion_group!(insert, append);
+criterion_main!(insert);