panic if shell desired as not impl

src/main.rs

@@ -1,3 +1,4 @@
+use io_prompt_prototype::prompt;
 use itertools::Itertools;
 
 mod flags;
@@ -12,11 +13,22 @@ fn main() {
         eprintln!("{:?}", flags);
     }
 
+    let once = flags.play.iter().filter(|x| x.len() > 0).count() > 0;
+    loop {
+        play_with_flags(&flags);
+        if once {
+            break;
+        }
+    }
+}
+
+fn play_with_flags(flags: &flags::Flags) {
     let mut syn_seq = seq::new_syn(syn::Syn::new(
-        flags.debug,
-        flags.sound_font,
-        flags.sample_rate,
+        flags.debug.clone(),
+        flags.sound_font.clone(),
+        flags.sample_rate.clone(),
     ));
+
     let mut i = 0;
     for p in flags.play.iter() {
         for p in play::new(p.clone()) {
@@ -24,11 +36,15 @@ fn main() {
             i += 1;
         }
     }
+    if i == 0 {
+        let s: String = prompt!("> ").parse().expect("failed to readline");
+        panic!("not impl");
+    }
 
-    play(syn_seq, flags.sample_rate, flags.bpm);
+    play(syn_seq, flags.sample_rate, flags.bpm, true);
 }
 
-fn play(mut s: seq::SynSeq, sample_rate: usize, bpm: usize) {
+fn play(mut s: seq::SynSeq, sample_rate: usize, bpm: usize, sync: bool) {
     let samples_per_beat = sample_rate / bpm * 60;
     let params = tinyaudio::prelude::OutputDeviceParameters {
         channels_count: 2,
@@ -52,6 +68,8 @@ fn play(mut s: seq::SynSeq, sample_rate: usize, bpm: usize) {
     })
     .unwrap();
 
-    // Wait it out
-    std::thread::sleep(std::time::Duration::from_secs(duration as u64));
+    if sync {
+        // Wait it out
+        std::thread::sleep(std::time::Duration::from_secs(duration as u64));
+    }
 }