1 files changed, 38 insertions, 0 deletions
diff --git a/rola-utils/macros/src/lib.rs b/rola-utils/macros/src/lib.rs
index 8b13789..46762e3 100644
--- a/rola-utils/macros/src/lib.rs
+++ b/rola-utils/macros/src/lib.rs
@@ -1 +1,39 @@
+use proc_macro::TokenStream;
 
+mod constants;
+
+/// Transforms `pub const` items in a module into equivalent functions.
+///
+/// Constants without `{param}` placeholders become `fn NAME() -> String`.
+/// Constants with `{param}` placeholders become `fn NAME(param: impl AsRef<str>) -> String`,
+/// using `format!()` to fill in the placeholders.
+///
+/// The entire module is annotated with `#[allow(non_snake_case)]`.
+///
+/// # Example
+///
+/// ```ignore
+/// #[rorolala_internal_macros::constants]
+/// pub mod paths {
+///     pub const ROLA_DRAFT_DIR: &str = ".rola";
+///     pub const ROLA_BINDED_BUCKET_FILE: &str = ".rola/BIND/{bucket}";
+/// }
+/// ```
+///
+/// expands to:
+///
+/// ```ignore
+/// #[allow(non_snake_case)]
+/// pub mod paths {
+///     pub fn ROLA_DRAFT_DIR() -> String {
+///         ".rola".to_string()
+///     }
+///     pub fn ROLA_BINDED_BUCKET_FILE(bucket: impl AsRef<str>) -> String {
+///         format!(".rola/BIND/{bucket}", bucket = bucket.as_ref())
+///     }
+/// }
+/// ```
+#[proc_macro_attribute]
+pub fn constants(attr: TokenStream, item: TokenStream) -> TokenStream {
+    constants::expand(attr, item)
+}