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//! 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)+
);
};
([$($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_double;
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