feat: Implement a drifting firehose overlay that scrolls independently over the main ticker content.

engine/scroll.py

@@ -14,6 +14,30 @@ from engine.terminal import RST, W_COOL, CLR, tw, th
 from engine.render import big_wrap, lr_gradient, make_block
 from engine.effects import noise, glitch_bar, fade_line, vis_trunc, next_headline, firehose_line
 
+_ANSI_LINE_RE = re.compile(r"^(\033\[[0-9;]*m)(.*)(\033\[0m)$")
+
+
+def _overlay_segments(ansi_line):
+    """Return (1-indexed column, colored chunk) for non-space runs in a line."""
+    m = _ANSI_LINE_RE.match(ansi_line)
+    if m:
+        color, text, _ = m.groups()
+    else:
+        color, text = "", ansi_line
+    segs = []
+    i = 0
+    while i < len(text):
+        if text[i] == " ":
+            i += 1
+            continue
+        j = i + 1
+        while j < len(text) and text[j] != " ":
+            j += 1
+        chunk = text[i:j]
+        segs.append((i + 1, f"{color}{chunk}{RST}" if color else chunk))
+        i = j
+    return segs
+
 
 def stream(items, ntfy_poller, mic_monitor):
     """Main rendering loop. Scrolls headlines, shows ntfy messages, applies effects."""
@@ -28,7 +52,7 @@ def stream(items, ntfy_poller, mic_monitor):
 
     w, h = tw(), th()
     fh = config.FIREHOSE_H if config.FIREHOSE else 0
-    sh = h - fh                    # scroll zone height
+    sh = h                         # headline scroll uses full viewport
     GAP = 3            # blank rows between headlines
     scroll_interval = config.SCROLL_DUR / (sh + 15) * 2
 
@@ -38,6 +62,10 @@ def stream(items, ntfy_poller, mic_monitor):
     next_y = sh        # canvas-y where next block starts (off-screen bottom)
     noise_cache = {}
     scroll_accum = 0.0
+    firehose_top = h - fh
+    firehose_rows = [firehose_line(items, w) for _ in range(fh)] if fh > 0 else []
+    firehose_accum = 0.0
+    firehose_interval = max(config.FRAME_DT, scroll_interval * 1.3)
 
     def _noise_at(cy):
         if cy not in noise_cache:
@@ -53,7 +81,7 @@ def stream(items, ntfy_poller, mic_monitor):
         t0 = time.monotonic()
         w, h = tw(), th()
         fh = config.FIREHOSE_H if config.FIREHOSE else 0
-        sh = h - fh
+        sh = h
 
         # ── Check for ntfy message ────────────────────────
         msg_h = 0  # rows consumed by message zone at top
@@ -95,7 +123,7 @@ def stream(items, ntfy_poller, mic_monitor):
             row_idx += 1
             msg_h = row_idx
 
-        # Effective scroll zone: below message, above firehose
+        # Effective ticker zone: below message
         scroll_h = sh - msg_h
 
         # ── Scroll: headline rendering (always runs) ──────
@@ -120,7 +148,22 @@ def stream(items, ntfy_poller, mic_monitor):
                 if k < cam:
                     del noise_cache[k]
 
-        # Draw scroll zone (below message zone, above firehose)
+        # Firehose overlay drift (slower than main ticker)
+        if config.FIREHOSE and fh > 0:
+            while len(firehose_rows) < fh:
+                firehose_rows.append(firehose_line(items, w))
+            if len(firehose_rows) > fh:
+                firehose_rows = firehose_rows[-fh:]
+            firehose_accum += config.FRAME_DT
+            while firehose_accum >= firehose_interval:
+                firehose_accum -= firehose_interval
+                firehose_top -= 1
+                firehose_rows.pop(0)
+                firehose_rows.append(firehose_line(items, w))
+            if firehose_top + fh < 0:
+                firehose_top = h - fh
+
+        # Draw ticker zone (below message zone)
         top_zone = max(1, int(scroll_h * 0.25))
         bot_zone = max(1, int(scroll_h * 0.10))
         grad_offset = (time.monotonic() * config.GRAD_SPEED) % 1.0
@@ -160,11 +203,6 @@ def stream(items, ntfy_poller, mic_monitor):
                 else:
                     buf.append(f"\033[{scr_row};1H\033[K")
 
-        # Draw firehose zone
-        if config.FIREHOSE and fh > 0:
-            for fr in range(fh):
-                fline = firehose_line(items, w)
-                buf.append(f"\033[{sh + fr + 1};1H{fline}\033[K")
 
         # Glitch — base rate + mic-reactive spikes (scroll zone only)
         mic_excess = mic_monitor.excess
@@ -177,6 +215,14 @@ def stream(items, ntfy_poller, mic_monitor):
                 scr_row = msg_h + gi + 1
                 buf[scroll_buf_start + gi] = f"\033[{scr_row};1H{glitch_bar(w)}"
 
+        if config.FIREHOSE and fh > 0:
+            for fr, fline in enumerate(firehose_rows):
+                scr_row = firehose_top + fr + 1
+                if scr_row <= msg_h or scr_row > h:
+                    continue
+                for col, chunk in _overlay_segments(fline):
+                    buf.append(f"\033[{scr_row};{col}H{chunk}")
+
         sys.stdout.buffer.write("".join(buf).encode())
         sys.stdout.flush()