refactor: added docs & limit types

Signed-off-by: SoXX <soxx@fenpa.ws>

pkg/e621/endpoints/executer.go

@@ -8,7 +8,38 @@ import (
 	"net/http"
 )
 
-func getRequest[T any](requestContext model.RequestContext, e621Endpoint string, query map[string]string) (T, error) {
+type RequestTypes interface {
+	model.User |
+		model.Tag |
+		model.Post |
+		model.PostResponse |
+		model.Pool |
+		model.Note |
+		[]model.User |
+		[]model.Tag |
+		[]model.Post |
+		[]model.Pool |
+		[]model.Note
+}
+
+// getRequest performs an HTTP GET request to the specified e621 API endpoint and unmarshals the JSON response into the provided type T.
+//
+// This generic function is designed to fetch data from the e621 API using an HTTP GET request.
+// It supports generic types and can unmarshal the JSON response into the provided type T.
+//
+// Parameters:
+//   - requestContext: The context for the API request, including the host, user agent, username, and API key.
+//   - e621Endpoint: The specific e621 API endpoint to be called.
+//   - query: A map containing additional query parameters for the API request. (Optional)
+//
+// Type Parameters:
+//   - T: The type into which the JSON response will be unmarshaled.
+//   - supported types are (also as slice): model.User, model.Tag, model.Post, model.PostResponse, model.Pool, model.Note
+//
+// Returns:
+//   - T: The result of unmarshaling the JSON response into the provided type.
+//   - error: An error, if any, encountered during the API request, response handling, or JSON unmarshaling.
+func getRequest[T RequestTypes](requestContext model.RequestContext, e621Endpoint string, query map[string]string) (T, error) {
 	var base T
 	// Create a new HTTP GET request to fetch user information from the specified 'host' and 'username'.
 	r, err := http.NewRequest("GET", fmt.Sprintf("%s/%s", requestContext.Host, e621Endpoint), nil)