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//! packer is a library that helps you pack static files into binaries using macro magic. Here's
//! how it's done:
//!
//! ### Step 1: Include
//!
//! Include the crate in your `Cargo.toml`:
//!
//! ```toml
//! [dependencies]
//! packer = "0.3"
//! ```
//!
//! ### Step 2: Derive
//!
//! Start deriving `Packer` from your structs. You need to provide a `source` attribute to indicate
//! the directory from which it should be pulling. Paths are relative to the crate root.
//!
//! ```
//! use packer::Packer;
//! #[derive(Packer)]
//! #[packer(source = "static")]
//! struct Assets;
//! ```
//!
//! ### Step 3: Use it!
//!
//! You can now access any file using the `get` function:
//!
//! ```
//! use packer::Packer;
//! # #[derive(Packer)]
//! # #[packer(source = "static")]
//! # struct Assets;
//! let data: Option<&'static [u8]> = Assets::get("kermit.jpg");
//! ```
//!
//! You may also choose to list all the files that have been stored.
//!
//! ```
//! use packer::Packer;
//! # #[derive(Packer)]
//! # #[packer(source = "static")]
//! # struct Assets;
//! let files /*: impl Iterator<Item = &'static str>*/ = Assets::list();
//! // Result (with no guarantee of order):
//! // files = ["static/first/kermit.jpg", "static/second/ignored.x", "static/second/LICENSE"]
//! ```
//!
//! _(See the documentation for the Packer trait for the full listing of methods.)_
//!
//! When you build in dev mode, it will fetch off your filesystem as usual, but when you build with
//! `--release`, it will pack the assets into your binary!
//!
//! # Ignoring Paths
//!
//! You can choose to ignore certain paths using the `ignore` option:
//!
//! ```
//! # use std::collections::BTreeSet;
//! # use packer::Packer;
//! #[derive(Packer)]
//! #[packer(source = "static/second", ignore = "*.x")]
//! struct Assets;
//!
//! // using BTreeSet since there's no guarantee of order
//! assert_eq!(Assets::list().into_iter().collect::<BTreeSet<_>>(),
//!            vec!["static/second/LICENSE"].into_iter().collect::<BTreeSet<_>>());
//! ```
//!

#[doc(hidden)]
pub use lazy_static::*;
#[doc(hidden)]
pub use packer_derive::*;

pub trait Packer {
    // used for iterator, will be changed when impl Trait is stable in trait methods
    #[doc(hidden)]
    type Item: Iterator<Item = &'static str> + Sized;

    /// Lists the files stored in the `Packer`.
    fn list() -> Self::Item;

    /// Returns the contents of the file named `file_name` as a `&'static [u8]` if it exists,
    /// `None` otherwise.
    fn get(file_name: &str) -> Option<&'static [u8]>;

    /// Returns the contents of the file named `file_name` as a `&'static str` if it exists and is
    /// valid UTF-8, `None` otherwise.
    fn get_str(file_name: &str) -> Option<&'static str>;
}