Clear font caches on config reload so newly installed fonts are picked up without restart

kitty/boss.py

@@ -3200,6 +3200,8 @@ class Boss:
         opts = load_config(*paths, overrides=final_overrides or None, accumulate_bad_lines=bad_lines)
         if bad_lines:
             self.show_bad_config_lines(bad_lines)
+        from .fonts.render import clear_font_caches
+        clear_font_caches()
         self.apply_new_options(opts)
         from .open_actions import clear_caches
         clear_caches()

kitty/fonts/common.py

@@ -65,6 +65,13 @@ else:
 
 
 cache_for_variable_data_by_path: dict[str, VariableData] = {}
+
+
+def clear_caches() -> None:
+    cache_for_variable_data_by_path.clear()
+    actually_variable_cache.clear()
+
+
 attr_map = {(False, False): 'font_family', (True, False): 'bold_font', (False, True): 'italic_font', (True, True): 'bold_italic_font'}
 
 

kitty/fonts/core_text.py

@@ -49,6 +49,11 @@ def create_font_map(all_fonts: Iterable[CoreTextFont]) -> FontMap:
     return ans
 
 
+def clear_caches() -> None:
+    all_fonts_map.cache_clear()
+    weight_range_for_family.cache_clear()
+
+
 @lru_cache(maxsize=2)
 def all_fonts_map(monospaced: bool = True) -> FontMap:
     return create_font_map(coretext_all_fonts(monospaced))

kitty/fonts/fontconfig.py

@@ -44,6 +44,12 @@ def create_font_map(all_fonts: tuple[FontConfigPattern, ...]) -> FontMap:
     return ans
 
 
+def clear_caches() -> None:
+    all_fonts_map.cache_clear()
+    fc_match.cache_clear()
+    weight_range_for_family.cache_clear()
+
+
 @lru_cache(maxsize=2)
 def all_fonts_map(monospaced: bool = True) -> FontMap:
     if monospaced:

kitty/fonts/render.py

@@ -187,6 +187,16 @@ def dump_font_debug() -> None:
             log_error('  ' + s.identify_for_debug())
 
 
+def clear_font_caches() -> None:
+    from .common import clear_caches as clear_common_caches
+    clear_common_caches()
+    if is_macos:
+        from .core_text import clear_caches as clear_platform_caches
+    else:
+        from .fontconfig import clear_caches as clear_platform_caches
+    clear_platform_caches()
+
+
 def set_font_family(opts: Options | None = None, override_font_size: float | None = None, add_builtin_nerd_font: bool = False) -> None:
     global current_faces, builtin_nerd_font_descriptor
     opts = opts or defaults