add phrase uuids; implement comparisons

crates/tek_sequencer/src/sequencer.rs

@@ -23,6 +23,7 @@ pub struct PhrasePool<E: Engine> {
 /// A MIDI sequence.
 #[derive(Debug)]
 pub struct Phrase {
+    pub uuid:        uuid::Uuid,
     /// Name of phrase
     pub name:        Arc<RwLock<String>>,
     /// Temporal resolution in pulses per quarter note
@@ -121,6 +122,7 @@ impl Phrase {
         name: &str, loop_on: bool, length: usize, notes: Option<PhraseData>
     ) -> Self {
         Self {
+            uuid:        uuid::Uuid::new_v4(),
             name:        Arc::new(RwLock::new(name.into())),
             ppq:         PPQ,
             length,
@@ -185,6 +187,12 @@ impl Phrase {
         }
     }
 }
+impl std::cmp::PartialEq for Phrase {
+    fn eq (&self, other: &Self) -> bool {
+        self.uuid == other.uuid
+    }
+}
+impl Eq for Phrase {}
 impl<E: Engine> PhrasePlayer<E> {
     pub fn new (name: &str) -> Self {
         Self {