add benchmarks to delete text

bench/Cargo.toml

@@ -27,3 +27,7 @@ harness = false
 [[bench]]
 name = "cursor"
 harness = false
+
+[[bench]]
+name = "delete"
+harness = false

bench/benches/delete.rs

@@ -0,0 +1,44 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use tui_textarea::{CursorMove, TextArea};
+use tui_textarea_bench::{dummy_terminal, TerminalExt, LOREM};
+
+#[derive(Clone, Copy)]
+enum Kind {
+    Char,
+    Word,
+    Line,
+}
+
+#[inline]
+fn run(textarea: &TextArea<'_>, kind: Kind) {
+    let mut term = dummy_terminal();
+    let mut t = textarea.clone();
+    t.move_cursor(CursorMove::Jump(u16::MAX, u16::MAX));
+    for _ in 0..100 {
+        let modified = match kind {
+            Kind::Char => t.delete_char(),
+            Kind::Word => t.delete_word(),
+            Kind::Line => t.delete_line_by_head(),
+        };
+        if !modified {
+            t = textarea.clone();
+            t.move_cursor(CursorMove::Jump(u16::MAX, u16::MAX));
+        }
+        term.draw_textarea(&t);
+    }
+}
+
+fn bench(c: &mut Criterion) {
+    let mut lines = vec![];
+    for _ in 0..10 {
+        lines.extend(LOREM.iter().map(|s| s.to_string()));
+    }
+    let textarea = TextArea::new(lines);
+
+    c.bench_function("delete::char", |b| b.iter(|| run(&textarea, Kind::Char)));
+    c.bench_function("delete::word", |b| b.iter(|| run(&textarea, Kind::Word)));
+    c.bench_function("delete::line", |b| b.iter(|| run(&textarea, Kind::Line)));
+}
+
+criterion_group!(delete, bench);
+criterion_main!(delete);