fancy animation for licence

1 files changed, 50 insertions, 0 deletions

diff --git a/src/animation.rs b/src/animation.rs
new file mode 100644
index 0000000..bfb17a4
--- /dev/null
+++ b/src/animation.rs
@@ -0,0 +1,50 @@
+use rocket::{
+    get,
+    http::{Cookie, CookieJar, Header},
+    response::{self, Responder},
+    Request,
+};
+
+pub struct Reload<T>(f64, pub T);
+
+#[rocket::async_trait]
+impl<'r, T: Responder<'r, 'static>> Responder<'r, 'static> for Reload<T> {
+    fn respond_to(self, request: &'r Request<'_>) -> response::Result<'static> {
+        let mut resp = self.1.respond_to(request);
+        if let Ok(resp) = &mut resp {
+            resp.set_header(Header::new("refresh", format!("{}", self.0)));
+        }
+        resp
+    }
+}
+
+const TEXT: &'static str = include_str!("../COPYING");
+const END_FRAME: isize = TEXT.len() as isize / 100 + 5;
+
+#[get("/wubbel")]
+pub fn r_wubbel(jar: &CookieJar) -> Reload<String> {
+    let frame = jar
+        .get("frame")
+        .and_then(|c| c.value().parse().ok())
+        .unwrap_or(0isize);
+    jar.add(Cookie::build("frame", format!("{}", (frame + 1) % (END_FRAME + 1))).finish());
+
+    let text = TEXT
+        .chars()
+        .enumerate()
+        .map(|(i, e)| {
+            if e == '\n' || frag(i as isize, frame) {
+                e
+            } else {
+                ' '
+            }
+        })
+        .collect::<String>();
+
+    Reload(if frame >= END_FRAME { 60.0 } else { 0.1 }, text)
+}
+
+#[inline]
+fn frag(i: isize, frame: isize) -> bool {
+    i % 5 < (frame - i / 100)
+}