headless_lms_utils/error/
macros.rs

1/*!
2Macro utilities for creating error types more ergonomically.
3
4This module provides helper macros that simplify error construction
5for types implementing `BackendError`.
6*/
7
8/// Internal helper macro that defines an error creation macro.
9///
10/// This avoids using the `paste` crate and keeps the implementation simple.
11/// Each error module should use this to define their own specialized macro.
12///
13/// # Examples
14///
15/// ```ignore
16/// // In models/src/error.rs:
17/// define_err_macro!(
18///     model_err,
19///     ModelError,
20///     ModelErrorType,
21///     "Create a ModelError."
22/// );
23/// ```
24#[macro_export]
25macro_rules! define_err_macro {
26    ($macro_name:ident, $error:ty, $error_type:ty, $doc:expr) => {
27        #[doc = $doc]
28        ///
29        /// # Examples
30        ///
31        /// ```ignore
32        /// // Without source
33        /// let err = macro_name!(Generic, "message".to_string());
34        ///
35        /// // With source
36        /// let err = macro_name!(Generic, "message".to_string(), source_err);
37        ///
38        /// // With format!
39        /// let err = macro_name!(Generic, format!("Failed: {}", detail));
40        /// ```
41        #[macro_export]
42        macro_rules! $macro_name {
43            // Without source: model_err!(Generic, "message")
44            ($variant:ident, $msg:expr) => {
45                <$error>::new(<$error_type>::$variant, $msg, None)
46            };
47            // With source: model_err!(Generic, "message", source_err)
48            ($variant:ident, $msg:expr, $src:expr) => {
49                <$error>::new(<$error_type>::$variant, $msg, Some($src.into()))
50            };
51        }
52    };
53}
headless_lms_utils/error/macros.rs

headless_lms_utils/error/
macros.rs
