accept -i for interactive

src/flags.rs

@@ -5,6 +5,9 @@ pub struct Flags {
     #[arg(short, long, default_value_t = false)]
     pub debug: bool,
 
+    #[arg(short, long, default_value_t = false)]
+    pub interactive: bool,
+
     #[arg(long, default_value_t = 120)]
     pub bpm: usize,
 

src/main.rs

@@ -9,10 +9,13 @@ mod syn;
 mod tone;
 
 fn main() {
-    let flags = flags::Flags::new();
+    let mut flags = flags::Flags::new();
     if flags.debug {
         eprintln!("{:?}", flags);
     }
+    if flags.interactive {
+        flags.play = vec![];
+    }
 
     let once = flags.play.iter().filter(|x| x.len() > 0).count() > 0;
     let mut player = player::new(flags.sample_rate.clone(), flags.bpm.clone());