feat(new): other backend or frontend from the blank template

README.md

@@ -1,6 +1,6 @@
 # newproject
 
-Composes a project from the templates in this organization: `infra` at the root, then `backend-python`, `frontend-svelte` and `caddy` on top, each with its own answers file in `.copier/`.
+Composes a project from the templates in this organization: `infra` at the root, then `backend-python`, `frontend-svelte`, `blank` and `caddy` on top, each with its own answers file in `.copier/`.
 
 ```sh
 source ~/projects/templates/newproject/shell.sh
@@ -15,6 +15,8 @@ updateproject backend    # one part
 newproject ~/projects/my-thing --parts backend,frontend,caddy --backend python --frontend svelte --serve bun --defaults
 ```
 
+`other` as the backend or the frontend renders the `blank` template: the part's compose files, Makefile and `.env.example` with no code, for a stack that has no template of its own, next to any other part.
+
 One part alone is rendered at the root of the project; two parts live in `backend/` and `frontend/`. After rendering, `make env` creates `.env` and every `docker-compose.override.yml` from their examples. `updateproject` needs a clean working tree and commits each part's update separately, so the next part starts from a clean tree again; conflicts stay in those commits for you to resolve. Templates are cloned from `https://git.kotikot.com/templates` unless `TEMPLATES_DIR` points at a directory with local checkouts; `TEMPLATES_REF=HEAD` renders their working trees instead of the latest tag.
 
 ## Renovate

templates.py

@@ -14,8 +14,9 @@ from copier import run_copy, run_update
 
 SOURCE = os.environ.get("TEMPLATES_DIR", "https://git.kotikot.com/templates")
 REF = os.environ.get("TEMPLATES_REF")
-BACKENDS = {"python": "backend-python"}
-FRONTENDS = {"svelte": "frontend-svelte"}
+BLANK = "blank"
+BACKENDS = {"python": "backend-python", "other": BLANK}
+FRONTENDS = {"svelte": "frontend-svelte", "other": BLANK}
 SERVE = ["bun", "static", "api"]
 
 
@@ -65,25 +66,32 @@ def new(args: argparse.Namespace) -> None:
     if "frontend" in parts:
         frontend = args.frontend or ask_select("Frontend", list(FRONTENDS), "svelte")
     serve = "bun"
-    if frontend:
+    if frontend and FRONTENDS[frontend] != BLANK:
         options = SERVE if backend else SERVE[:-1]
         serve = args.serve or ask_select("Frontend served by", options, "bun")
     stack = [p for p in ("backend", "frontend") if p in parts]
     single = len(stack) == 1
     routes = [r for r, ok in (("api", backend), ("frontend", frontend and serve != "api")) if ok]
 
-    def copy(name: str, data: dict) -> None:
-        run_copy(template(name), dest, data=data, unsafe=True, defaults=args.defaults, vcs_ref=REF)
+    def copy(name: str, data: dict, answers_file: str | None = None) -> None:
+        run_copy(template(name), dest, data=data, answers_file=answers_file, unsafe=True,
+                 defaults=args.defaults, vcs_ref=REF)
+
+    def copy_part(part: str, name: str, data: dict) -> None:
+        if name == BLANK:
+            copy(name, {**identity, "layout": layout, "part": part}, f".copier/{part}.yml")
+        else:
+            copy(name, {**identity, "layout": layout, **data})
 
     dest.mkdir(parents=True, exist_ok=True)
     identity = {"project_name": name, "project_slug": slug}
     copy("infra", {"project_name": name, "layout": "single" if single else "parts", "parts": [] if single else stack})
     layout = "root" if single else "part"
     if backend:
-        copy(BACKENDS[backend], {**identity, "layout": layout, "serve_spa": serve == "api",
-                                 "author_name": git_config("user.name"), "author_email": git_config("user.email")})
+        copy_part("backend", BACKENDS[backend], {"serve_spa": serve == "api", "author_name": git_config("user.name"),
+                                                 "author_email": git_config("user.email")})
     if frontend:
-        copy(FRONTENDS[frontend], {**identity, "layout": layout, "serve": serve})
+        copy_part("frontend", FRONTENDS[frontend], {"serve": serve})
     if "caddy" in parts:
         copy("caddy", {"project_slug": slug, "routes": routes})
     if (dest / "Makefile").is_file():