clippy_lints/src/pub_use.rs

use clippy_utils::diagnostics::span_lint_and_then;
use rustc_ast::ast::{Item, ItemKind, VisibilityKind};
use rustc_lint::{EarlyContext, EarlyLintPass};
use rustc_session::declare_lint_pass;

declare_clippy_lint! {
    /// ### What it does
    /// Restricts the usage of `pub use ...`
    ///
    /// ### Why restrict this?
    /// A project may wish to limit `pub use` instances to prevent
    /// unintentional exports, or to encourage placing exported items directly in public modules.
    ///
    /// ### Example
    /// ```no_run
    /// pub mod outer {
    ///     mod inner {
    ///         pub struct Test {}
    ///     }
    ///     pub use inner::Test;
    /// }
    ///
    /// use outer::Test;
    /// ```
    /// Use instead:
    /// ```no_run
    /// pub mod outer {
    ///     pub struct Test {}
    /// }
    ///
    /// use outer::Test;
    /// ```
    #[clippy::version = "1.62.0"]
    pub PUB_USE,
    restriction,
    "restricts the usage of `pub use`"
}
declare_lint_pass!(PubUse => [PUB_USE]);

impl EarlyLintPass for PubUse {
    fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) {
        if let ItemKind::Use(_) = item.kind
            && let VisibilityKind::Public = item.vis.kind
        {
            #[expect(clippy::collapsible_span_lint_calls, reason = "rust-clippy#7797")]
            span_lint_and_then(cx, PUB_USE, item.span, "using `pub use`", |diag| {
                diag.help("move the exported item to a public module instead");
            });
        }
    }
}