polished-css-macros 0.1.0

Procedural macros which support the development of a library crate `polished-css`.
Documentation 
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use darling::FromDeriveInput;
use proc_macro2::TokenStream;
use quote::quote;
use syn::{DeriveInput, Ident};

#[derive(darling::FromDeriveInput)]
#[darling(attributes(default), supports(struct_tuple))]
pub struct DefaultOptions {
    pub value: Ident,
}

pub fn impl_default(ast: &DeriveInput) -> TokenStream {
    let DefaultOptions { value, .. } = DefaultOptions::from_derive_input(ast)
        .expect("Failed to parse Default proc macro derive attributes");
    let struct_ident = &ast.ident;
    let enum_value_ident = Ident::new(
        format!("{}Value", struct_ident).as_str(),
        struct_ident.span(),
    );

    quote! {
        impl Default for #struct_ident<#enum_value_ident> {
            fn default() -> Self {
                Self(#enum_value_ident::#value)
            }
        }
    }
}