//! Can You See Me Now?
//!
//! - **Date:** April 26, 2019
//! - **Subject:** Item visibility and `pub(<restricted>)` as API design tools.
//! - [**download mp3**][mp3]
//! - [**script**][script]
//!
//! [mp3]: https://www.podtrac.com/pts/redirect.mp3/cdn.newrustacean.com/file/newrustacean/e030.mp3
//! [script]: https://newrustacean.com/show_notes/e030/struct.script
//!
//! <audio style="width: 100%" title="e030: Can You See Me Now?" controls preload=metadata src="https://www.podtrac.com/pts/redirect.mp3/cdn.newrustacean.com/file/newrustacean/e030.mp3">
//!
//! Show Notes
//! ----------
//!
//! The easiest and most effective way to understand the example in this case
//! will simply be to look directly at [the source code][src]. You *can* read
//! the docs for each of the nested modules, but you'll be doing a *lot* of
//! navigating around for that.
//!
//! [src]: /src/show_notes/e030.rs.html
//!
//! Also, I am using Cargo’s `--document-private-items` flag, so that you can
//! see *all* the items in *all* the modules, even those which are not public,
//! but note that usually you would not see docs for those!
//!
//! ### Links
//!
//! - [the reference on visibility]
//! - [RFC #1422]
//! - [episode source code]
//! - [e020]
//!
//! [the reference on visibility]: https://doc.rust-lang.org/reference/visibility-and-privacy.html
//! [RFC #1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
//! [episode source code]: https://newrustacean.com/src/show_notes/e030.rs.html
//! [e020]: https://newrustacean.com/show_notes/e020/
//!
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#[doc = include_str!("../docs/e030-script.md")]
pub struct Script;

/// One of two internal modules (with `right`) for demonstrating visibility.
pub mod left {
    /// Visible to other items in `left`, including in sub-modules.
    fn local() {}

    /// `pub(crate) mod a` is visible everywhere within the crate that can see
    /// `left`, but hidden from all external callers.
    pub(crate) mod a {
        /// This is visible everywhere in the crate that can see `a`. Open the
        /// source to see all the other items it can interact with!
        pub fn demo() {
            // We can see other items in `left` or `a` regardless of visibility.
            super::local();
            sibling();

            // We can see other items which are marked as visible within `left`.
            crate::e030::left::b::demo();

            // We can see other items which are marked as visible within `e030`,
            // whether direct siblings to us or not.
            crate::e030::left::c::demo();
            super::c::demo();
            crate::e030::right::s::demo();

            // We can see other items which are marked as visible within the
            // crate.
            crate::e030::right::q::demo();

            // This won't compile because `crate::e030::right::r` is not visible
            // here: it is only visible within `crate::e030::right`.
            // crate::e030::right::r::demo();

            // We also cannot see items in `child` unless they are some `pub`
            // variant.
            // super::private_child::only_in_child();

            // But we can
            // super::private_child::also_only_in_child();
        }

        /// `fn sibling` is visible only to other items within `a`.
        fn sibling() {}

        /// `mod child` here is visible to `a`, but not outside `a` -- including
        /// even is siblings.
        mod private_child {
            /// `fn only_in_child` is not visible to anything outside `child`.
            fn only_in_child() {}

            /// `pub fn also_only_in_child` is also hidden to anything outside
            /// `child`.
            pub fn also_only_in_child() {}
        }
    }

    /// `pub(in crate::e030::left) mod b` is visible to
    pub(in crate::e030::left) mod b {

        /// This is visible everywhere in the crate that can see `b`. Open
        /// the source to see how all the other items it can interact with!
        pub fn demo() {}
    }

    pub(in crate::e030) mod c {
        /// This is visible everywhere in the crate that can see `b`. Open the
        /// source to see how all the other items it can interact with!
        pub fn demo() {}
    }
}

/// One of two internal modules (with `left`) for demonstrating visibility.
pub mod right {
    /// This is visible *within* the crate everywhere that can see `right`.
    pub(crate) mod q {
        /// This is visible everywhere in the crate that can see `q`. Visibility
        /// exactly mirrors `crate::e030::left::a::demo`.
        pub fn demo() {}
    }

    /// This is visible everywhere in `right`, including in `q`.
    pub(in crate::e030::right) mod r {
        /// This is visible everywhere in the crate that can see `s`. Open
        /// the source to see how all the other items it can interact with!
        pub fn demo() {}
    }

    /// This is visible everywhere in the e030 module.
    pub(in crate::e030) mod s {
        pub fn demo() {}
    }
}