refactor: replace use_dependency_history with a more generic macro

1 files changed, 36 insertions, 10 deletions

diff --git a/src/util.rs b/src/util.rs
index 2d2d911..373d784 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -1,15 +1,41 @@
-#[cfg(not(test))]
-macro_rules! use_dependency_history {
-    () => {
-        use $crate::dependency_history::DependencyHistory;
+//! Internal utilities.
+
+/// Imports the specified item, prepending 'Mock' to the item identifier if the `test`
+/// configuration option is set.
+///
+/// # Examples
+/// ```ignore
+/// use_double!(crate::dependency_history::DependencyHistory);
+/// ```
+/// <br>
+///
+/// Expands to the following when `cfg(not(test))`
+/// ```ignore
+/// use crate::dependency_history::DependencyHistory;
+/// ```
+/// <br>
+///
+/// Expands to the following when `cfg(test)`
+/// ```ignore
+/// use crate::dependency_history::MockDependencyHistory as DependencyHistory;
+/// ```
+macro_rules! use_double {
+    ($([$($part: ident),*])? $item_path_part: ident :: $($next_part: tt)+) => {
+        use_double!(
+            [$($($part,)*)? $item_path_part]
+            $($next_part)+
+        );
     };
-}
 
-#[cfg(test)]
-macro_rules! use_dependency_history {
-    () => {
-        use $crate::dependency_history::MockDependencyHistory as DependencyHistory;
+    ([$($part: ident),*] $item_path_part: ident) => {
+        #[cfg(not(test))]
+        use $($part::)* $item_path_part;
+
+        ::paste::paste! {
+            #[cfg(test)]
+            use $($part::)* [<Mock $item_path_part>] as $item_path_part;
+        }
     };
 }
 
-pub(crate) use use_dependency_history;
+pub(crate) use use_double;