feat: Implement an interactive font face picker at startup, allowing selection of specific font faces from a font file.

engine/render.py

@@ -6,6 +6,7 @@ Depends on: config, terminal, sources, translate.
 
 import re
 import random
+from pathlib import Path
 
 from PIL import Image, ImageDraw, ImageFont
 
@@ -49,16 +50,51 @@ MSG_GRAD_COLS = [
 
 # ─── FONT LOADING ─────────────────────────────────────────
 _FONT_OBJ = None
+_FONT_OBJ_KEY = None
 _FONT_CACHE = {}
 
 
 def font():
-    """Lazy-load the primary OTF font."""
-    global _FONT_OBJ
-    if _FONT_OBJ is None:
-        _FONT_OBJ = ImageFont.truetype(config.FONT_PATH, config.FONT_SZ)
+    """Lazy-load the primary OTF font (path + face index aware)."""
+    global _FONT_OBJ, _FONT_OBJ_KEY
+    key = (config.FONT_PATH, config.FONT_INDEX, config.FONT_SZ)
+    if _FONT_OBJ is None or _FONT_OBJ_KEY != key:
+        _FONT_OBJ = ImageFont.truetype(
+            config.FONT_PATH, config.FONT_SZ, index=config.FONT_INDEX
+        )
+        _FONT_OBJ_KEY = key
     return _FONT_OBJ
 
+def clear_font_cache():
+    """Reset cached font objects after changing primary font selection."""
+    global _FONT_OBJ, _FONT_OBJ_KEY
+    _FONT_OBJ = None
+    _FONT_OBJ_KEY = None
+
+
+def load_font_face(font_path, font_index=0, size=None):
+    """Load a specific face from a font file or collection."""
+    font_size = size or config.FONT_SZ
+    return ImageFont.truetype(font_path, font_size, index=font_index)
+
+
+def list_font_faces(font_path, max_faces=64):
+    """Return discoverable face indexes + display names from a font file."""
+    faces = []
+    for idx in range(max_faces):
+        try:
+            fnt = load_font_face(font_path, idx)
+        except Exception:
+            if idx == 0:
+                raise
+            break
+        family, style = fnt.getname()
+        display = f"{family} {style}".strip()
+        if not display:
+            display = f"{Path(font_path).stem} [{idx}]"
+        faces.append({"index": idx, "name": display})
+    return faces
+
 
 def font_for_lang(lang=None):
     """Get appropriate font for a language."""