Capture keyed prompts and source-backed content at load time

internal/prompt/template.go

@@ -0,0 +1,15 @@
+package prompt
+
+import "text/template"
+
+// CompileTemplate checks static syntax with the same grammar and function
+// names as rendering, without evaluating request inputs or variables.
+func CompileTemplate(name, raw string) (*template.Template, error) {
+	return parseTemplate(name, raw, template.FuncMap{
+		"input": func(string) (string, error) { return "", nil },
+	})
+}
+
+func parseTemplate(name, raw string, funcs template.FuncMap) (*template.Template, error) {
+	return template.New(name).Funcs(funcs).Option("missingkey=error").Parse(raw)
+}