add a more realistic benchmark

1 files changed, 32 insertions, 0 deletions

diff --git a/examples/perf.rs b/examples/perf.rs
new file mode 100644
index 0000000..4222c6e
--- /dev/null
+++ b/examples/perf.rs
@@ -0,0 +1,32 @@
+use std::io::{Read as _, Write as _};
+
+fn read_frames() -> impl Iterator<Item = Vec<u8>> {
+    (1..=7625).map(|i| {
+        let mut file =
+            std::fs::File::open(format!("tests/data/crawl/crawl{}", i))
+                .unwrap();
+        let mut frame = vec![];
+        file.read_to_end(&mut frame).unwrap();
+        frame
+    })
+}
+
+fn draw_frames(frames: &[Vec<u8>]) {
+    let mut stdout = std::io::stdout();
+    let mut parser = vt100::Parser::new(24, 80);
+    let mut screen = parser.screen().clone();
+    for frame in frames {
+        parser.process(&frame);
+        let new_screen = parser.screen().clone();
+        let diff = new_screen.contents_diff(&screen);
+        stdout.write_all(&diff).unwrap();
+        screen = new_screen;
+    }
+}
+
+fn main() {
+    let frames: Vec<Vec<u8>> = read_frames().collect();
+    for _ in 1..10 {
+        draw_frames(&frames);
+    }
+}