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refactor(cosmic-config-derive): add support for types with generic parameters

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Ashley Wulber 2023-05-21 23:15:08 -04:00
parent b064293632
commit b82b6566f1
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GPG key ID: 5216D4F46A90A820
4 changed files with 23 additions and 6 deletions
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20
cosmic-config-derive/src/lib.rs
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@ -1,6 +1,6 @@
use proc_macro::TokenStream;
use quote::quote;
use syn;
use syn::{self, parse_quote};
#[proc_macro_derive(CosmicConfigEntry)]
pub fn cosmic_config_entry_derive(input: TokenStream) -> TokenStream {
@ -14,6 +14,7 @@ pub fn cosmic_config_entry_derive(input: TokenStream) -> TokenStream {
fn impl_cosmic_config_entry_macro(ast: &syn::DeriveInput) -> TokenStream {
let name = &ast.ident;
let generics = &ast.generics;
// Get the fields of the struct
let fields = match ast.data {
@ -42,8 +43,23 @@ fn impl_cosmic_config_entry_macro(ast: &syn::DeriveInput) -> TokenStream {
}
});
// Get the existing where clause or create a new one if it doesn't exist
let mut where_clause = ast
.generics
.where_clause
.clone()
.unwrap_or_else(|| parse_quote!(where));
// Add your additional constraints to the where clause
// Here, we add the constraint 'T: Debug' to all generic parameters
for param in ast.generics.params.iter() {
where_clause
.predicates
.push(parse_quote!(#param: ::std::default::Default + ::serde::Serialize + ::serde::de::DeserializeOwned));
}
let gen = quote! {
impl CosmicConfigEntry for #name {
impl #generics CosmicConfigEntry for #name #generics #where_clause {
fn write_entry(&self, config: &Config) -> Result<(), cosmic_config::Error> {
#(#write_each_config_field)*
Ok(())