1 files changed, 60 insertions, 0 deletions
diff --git a/third_party/rust/termion/examples/rainbow.rs b/third_party/rust/termion/examples/rainbow.rs
new file mode 100644
index 0000000000..4ee4000d01
--- /dev/null
+++ b/third_party/rust/termion/examples/rainbow.rs
@@ -0,0 +1,60 @@
+extern crate termion;
+
+use termion::event::Key;
+use termion::input::TermRead;
+use termion::raw::IntoRawMode;
+use std::io::{Write, stdout, stdin};
+
+fn rainbow<W: Write>(stdout: &mut W, blue: u8) {
+    write!(stdout,
+           "{}{}",
+           termion::cursor::Goto(1, 1),
+           termion::clear::All)
+            .unwrap();
+
+    for red in 0..32 {
+        let red = red * 8;
+        for green in 0..64 {
+            let green = green * 4;
+            write!(stdout,
+                   "{} ",
+                   termion::color::Bg(termion::color::Rgb(red, green, blue)))
+                    .unwrap();
+        }
+        write!(stdout, "\n\r").unwrap();
+    }
+
+    writeln!(stdout, "{}b = {}", termion::style::Reset, blue).unwrap();
+}
+
+fn main() {
+    let stdin = stdin();
+    let mut stdout = stdout().into_raw_mode().unwrap();
+
+    writeln!(stdout,
+             "{}{}{}Use the up/down arrow keys to change the blue in the rainbow.",
+             termion::clear::All,
+             termion::cursor::Goto(1, 1),
+             termion::cursor::Hide)
+            .unwrap();
+
+    let mut blue = 172u8;
+
+    for c in stdin.keys() {
+        match c.unwrap() {
+            Key::Up => {
+                blue = blue.saturating_add(4);
+                rainbow(&mut stdout, blue);
+            }
+            Key::Down => {
+                blue = blue.saturating_sub(4);
+                rainbow(&mut stdout, blue);
+            }
+            Key::Char('q') => break,
+            _ => {}
+        }
+        stdout.flush().unwrap();
+    }
+
+    write!(stdout, "{}", termion::cursor::Show).unwrap();
+}