#![warn(
    missing_docs,
    unused_import_braces,
    clippy::pedantic,
    missing_debug_implementations
)]

//! Helpers for making proc macro crates

pub extern crate self as easy_proc;

use proc_macro2::Ident;
pub use proc_macro_error;
use syn::Attribute;

pub use easy_proc_common::{find_attr, find_attrs};
pub use easy_proc_derive::ArgumentList;

/// A parsable list of arguments
pub trait ArgumentList: Sized {
    /// Parses the arguments of an attribute
    fn parse_arguments(attr: &Attribute) -> Self;
}

/// Parses a list of attributes for a given ident and type
pub fn parse_attribute_list<'a, T, I>(ident: &'a Ident, attrs: I) -> impl Iterator<Item = T> + 'a
where
    T: 'a + ArgumentList,
    I: IntoIterator<Item = &'a Attribute> + 'a,
{
    attrs
        .into_iter()
        .filter(move |attr| attr.path().is_ident(ident))
        .map(T::parse_arguments)
}