[feat] Extension Builder (#3339)

lnbits/helpers.py

@@ -53,7 +53,12 @@ def static_url_for(static: str, path: str) -> str:
 
 
 def template_renderer(additional_folders: list | None = None) -> Jinja2Templates:
-    folders = ["lnbits/templates", "lnbits/core/templates"]
+    folders = [
+        "lnbits/templates",
+        "lnbits/core/templates",
+        settings.extension_builder_working_dir_path.as_posix(),
+    ]
+
     if additional_folders:
         additional_folders += [
             Path(settings.lnbits_extensions_path, "extensions", f)
@@ -368,3 +373,27 @@ def normalize_endpoint(endpoint: str, add_proto=True) -> str:
             f"https://{endpoint}" if not endpoint.startswith("http") else endpoint
         )
     return endpoint
+
+
+def camel_to_words(name: str) -> str:
+    # Add space before capital letters (but not at the start)
+    words = re.sub(r"(?<!^)(?=[A-Z])", " ", name)
+    return words.strip()
+
+
+def camel_to_snake(name: str) -> str:
+    name = re.sub(r"(.)([A-Z][a-z]+)", r"\1_\2", name)
+    name = re.sub(r"([a-z0-9])([A-Z])", r"\1_\2", name)
+    return name.lower()
+
+
+def is_camel_case(v: str) -> bool:
+    return re.match(r"^[A-Z][a-z0-9]+([A-Z][a-z0-9]+)*$", v) is not None
+
+
+def is_snake_case(v: str) -> bool:
+    return re.match(r"^[a-z]+(_[a-z0-9]+)*$", v) is not None
+
+
+def lowercase_first_letter(s: str) -> str:
+    return s[:1].lower() + s[1:] if s else s