Add example that exposes WinRT issue where speech doubles in some circumstances.

examples/99bottles.rs

@@ -0,0 +1,43 @@
+use std::io;
+use std::{thread, time};
+
+#[cfg(target_os = "macos")]
+use cocoa_foundation::base::id;
+#[cfg(target_os = "macos")]
+use cocoa_foundation::foundation::NSRunLoop;
+#[cfg(target_os = "macos")]
+use objc::{msg_send, sel, sel_impl};
+
+use tts::*;
+
+fn main() -> Result<(), Error> {
+    env_logger::init();
+    let mut tts = TTS::default()?;
+    let Features {
+        utterance_callbacks,
+        ..
+    } = tts.supported_features();
+    let mut bottles = 99;
+    while bottles > 0 {
+        tts.speak(format!("{} bottles of beer on the wall,", bottles), false)?;
+        tts.speak(format!("{} bottles of beer,", bottles), false)?;
+        tts.speak("Take one down, pass it around", false)?;
+        tts.speak("Give us a bit to drink this...", false)?;
+        let time = time::Duration::from_secs(5);
+        thread::sleep(time);
+        bottles -= 1;
+        tts.speak(format!("{} bottles of beer on the wall,", bottles), false)?;
+    }
+    let mut _input = String::new();
+    // The below is only needed to make the example run on MacOS because there is no NSRunLoop in this context.
+    // It shouldn't be needed in an app or game that almost certainly has one already.
+    #[cfg(target_os = "macos")]
+    {
+        let run_loop: id = unsafe { NSRunLoop::currentRunLoop() };
+        unsafe {
+            let _: () = msg_send![run_loop, run];
+        }
+    }
+    io::stdin().read_line(&mut _input)?;
+    Ok(())
+}