fix: changes to templates do not trigger rebuild (#103)

Signed-off-by: squidfunk <martin.donath@squidfunk.com>

python/zensical/config.py

@@ -118,6 +118,12 @@ def get_theme_dir() -> str:
     return os.path.join(path, "templates")
 
 
+def get_custom_theme_dir(config: dict) -> str | None:
+    """Return the custom theme directory."""
+    path = os.path.dirname(os.path.abspath(__file__))
+    return os.path.join(path, config["theme"]["custom_dir"])
+
+
 def _apply_defaults(config: dict, path: str) -> dict:
     """Apply default settings in configuration.
 
@@ -424,6 +430,8 @@ def _apply_defaults(config: dict, path: str) -> dict:
             config["markdown_extensions"].append("mkdocstrings")
             config["mdx_configs"]["mkdocstrings"] = mkdocstrings_config
 
+    # Hash all templates, so we rebuild if something changes
+    config["template_hash"] = _hash(_list_templates(config))
     return config
 
 
@@ -456,6 +464,29 @@ def _hash(data: Any) -> int:
     return int(hash.hexdigest(), 16) % (2**64)
 
 
+def _list_templates(config: dict) -> list[tuple[str, int]]:
+    """List all template files in the theme directories."""
+    dirs = [get_theme_dir()]
+    if "custom_dir" in config["theme"]:
+        custom_dir = get_custom_theme_dir(config)
+        if custom_dir is not None:
+            dirs.append(custom_dir)
+
+    # Collect file paths and their mtimes
+    files_with_mtime = []
+    for directory in dirs:
+        for path, _, files in os.walk(directory):
+            if ".icons" in path:
+                continue
+            for file in files:
+                file_path = os.path.join(path, file)
+                mtime = os.path.getsize(file_path)
+                files_with_mtime.append((file_path, mtime))
+
+    # Sort by file path for deterministic order
+    return sorted(files_with_mtime)
+
+
 def _convert_extra(data: dict | list) -> dict | list:
     """Recursively convert all None values in a dictionary or list to empty strings."""
     if isinstance(data, dict):