Initial commit

src/greeting/__init__.py

@@ -0,0 +1 @@
+from .template import render, TemplateError

src/greeting/template.py

@@ -0,0 +1,13 @@
+from textutil import normalize
+
+
+class TemplateError(ValueError):
+    pass
+
+
+def render(template: str, name: str) -> str:
+    normalized = normalize(name)
+    try:
+        return template.format(name=normalized)
+    except (KeyError, IndexError, ValueError):
+        raise TemplateError(f"unsupported placeholder in {template!r}")