Validate email and don't add it if empty (#43)

copier.yml

@@ -27,6 +27,11 @@ author_email:
   help: Extension author email
   default: ""
   placeholder: "me@test.com"
+  # Allow empty email or test it against regex
+  validator: >-
+    {% if author_email and not (author_email | regex_search('^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$')) %}
+    author_email must be a valid email address.
+    {% endif %}
 
 labextension_name:
   type: str

template/package.json.jinja

@@ -12,10 +12,10 @@
         "url": "{{ repository }}/issues"
     },
     "license": "BSD-3-Clause",
-    "author": {
+    "author": {% if author_email %}{
         "name": "{{ author_name }}",
         "email": "{{ author_email }}"
-    },
+    },{% else %}"{{ author_name }}",{% endif %}
     "files": [
         "lib/**/*.{d.ts,eot,gif,html,jpg,js,js.map,json,png,svg,woff2,ttf}",
         "style/**/*.{css,js,eot,gif,html,jpg,json,png,svg,woff2,ttf}"{% if has_settings %},

template/pyproject.toml.jinja

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["hatchling>=1.5.0", "jupyterlab>=4.0.0,<5", "hatch-nodejs-version"]
+requires = ["hatchling>=1.5.0", "jupyterlab>=4.0.0,<5", "hatch-nodejs-version>=0.3.2"]
 build-backend = "hatchling.build"
 
 [project]