feat: add script module for note-to-command mapping with FIFO support

engine/src/looper.c

@@ -565,7 +565,8 @@ void looper_process_commands(jack_client_t *client) {
       if (data) {
         memcpy(data, sc->loop.audio_buffer, (size_t)lc * sizeof(float));
         unsigned sr = (unsigned)global_sample_rate;
-        if (sr == 0) sr = 48000;
+        if (sr == 0)
+          sr = 48000;
         wav_write("save.wav", data, (unsigned)lc, sr);
         free(data);
       }

engine/src/ringbuffer.c

@@ -8,15 +8,18 @@ static inline size_t load_tail(const RingBuf *r) {
   return atomic_load_explicit(&r->tail, memory_order_relaxed);
 }
 static inline void store_head(RingBuf *r, size_t v) {
-  atomic_store_explicit(&r->head, v, memory_order_release); // release after data written
+  atomic_store_explicit(&r->head, v,
+                        memory_order_release); // release after data written
 }
 static inline void store_tail(RingBuf *r, size_t v) {
-  atomic_store_explicit(&r->tail, v, memory_order_release); // release after data read
+  atomic_store_explicit(&r->tail, v,
+                        memory_order_release); // release after data read
 }
 
 int ring_init(RingBuf *r, size_t capacity) {
   r->buf = (float *)malloc(capacity * sizeof(float));
-  if (!r->buf) return -1;
+  if (!r->buf)
+    return -1;
   r->capacity = capacity;
   atomic_init(&r->head, 0);
   atomic_init(&r->tail, 0);
@@ -30,13 +33,16 @@ void ring_destroy(RingBuf *r) {
 }
 
 size_t ring_write(RingBuf *r, const float *data, size_t count) {
-  size_t tail = load_tail(r);           // producer reads consumer's tail (relaxed is fine)
-  size_t head = load_head(r);           // own head
+  size_t tail =
+      load_tail(r); // producer reads consumer's tail (relaxed is fine)
+  size_t head = load_head(r); // own head
   size_t cap = r->capacity;
   size_t used = (head >= tail) ? (head - tail) : (cap - (tail - head));
   size_t avail = cap - 1 - used;
-  if (count > avail) count = avail;
-  if (count == 0) return 0;
+  if (count > avail)
+    count = avail;
+  if (count == 0)
+    return 0;
 
   size_t pos = head;
   for (size_t i = 0; i < count; ++i) {
@@ -48,12 +54,15 @@ size_t ring_write(RingBuf *r, const float *data, size_t count) {
 }
 
 size_t ring_read(RingBuf *r, float *data, size_t count) {
-  size_t head = atomic_load_explicit(&r->head, memory_order_acquire); // acquire – see producer's writes
-  size_t tail = load_tail(r);           // own tail
+  size_t head = atomic_load_explicit(
+      &r->head, memory_order_acquire); // acquire – see producer's writes
+  size_t tail = load_tail(r);          // own tail
   size_t cap = r->capacity;
   size_t used = (head >= tail) ? (head - tail) : (cap - (tail - head));
-  if (count > used) count = used;
-  if (count == 0) return 0;
+  if (count > used)
+    count = used;
+  if (count == 0)
+    return 0;
 
   size_t pos = tail;
   for (size_t i = 0; i < count; ++i) {