wip: running interface in separate or combined mode

also disassociating render functions from state structs

src/sequencer.rs

@@ -0,0 +1,39 @@
+mod handle;
+mod render;
+mod jack;
+pub use self::handle::*;
+pub use self::render::*;
+pub use self::jack::*;
+use crate::prelude::*;
+
+pub struct Sequencer {
+    jack:     Jack<Notifications>,
+    exit:     bool,
+    stdout:   Stdout,
+    cursor:   (u16, u16),
+    duration: u16,
+}
+
+impl Sequencer {
+    pub fn new () -> Result<Self, Box<dyn Error>> {
+        let (client, status) = Client::new(
+            "bloop-sequencer",
+            ClientOptions::NO_START_SERVER
+        )?;
+        let jack = client.activate_async(
+            Notifications,
+            ClosureProcessHandler::new(Box::new(
+                move |_: &Client, _: &ProcessScope| -> Control {
+                    Control::Continue
+                }) as Box<dyn FnMut(&Client, &ProcessScope)->Control + Send>
+            )
+        )?;
+        Ok(Self {
+            exit:     false,
+            stdout:   std::io::stdout(),
+            cursor:   (0, 0),
+            duration: 0,
+            jack,
+        })
+    }
+}