add units to shopw digit length reabale

collatz_ui/views.py

@@ -2,11 +2,19 @@ from __future__ import annotations
 
 import curses
 from pathlib import Path
-from typing import List
+from typing import List, Tuple
 
 from .colors import UIColors
 
 
+_DIGIT_UNITS: List[Tuple[int, str]] = [
+    (10**12, "T digits"),
+    (10**9, "G digits"),
+    (10**6, "M digits"),
+    (10**3, "K digits"),
+]
+
+
 class HeaderView:
     """Top panel containing summary information."""
 
@@ -28,9 +36,10 @@ class HeaderView:
         cols = max(1, cols)
         usable = max(1, cols - 1)
         bar = "─" * usable
+        digits_line = self._format_digits_line(step, digits_len)
         lines = [
             " Collatz Stream Visualizer ",
-            f" Step {step:,} • Digits {digits_len:,}",
+            digits_line,
             f" Elapsed {elapsed:8.2f}s • Avg {avg_step:8.5f}s",
             f" Current calc {current_calc:6.2f}s {'⏳' if computing else '✓'} • Last {last_calc:6.2f}s",
             " ▲ green = 3n+1 • ▼ red = /2 • ↑↓ number scroll • PgUp/PgDn logs • q quit",
@@ -50,6 +59,14 @@ class HeaderView:
 
         self.win.noutrefresh()
 
+    @staticmethod
+    def _format_digits_line(step: int, digits_len: int) -> str:
+        for threshold, label in _DIGIT_UNITS:
+            if digits_len >= threshold:
+                scaled = digits_len / float(threshold)
+                return f" Step {step:,} • {scaled:,.2f} {label}"
+        return f" Step {step:,} • Digits {digits_len:,}"
+
 
 class GraphView:
     """Single-row sparkline showing how each step transformed the value."""