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feat(config): support for intermediate serialization/deserialization type via field attribute

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This commit is contained in:
Ashley Wulber 2026-03-26 15:51:41 -04:00
parent bec679efc9
commit 6653157def
1 changed files with 96 additions and 20 deletions
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116
cosmic-config-derive/src/lib.rs
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@ -1,8 +1,8 @@
use proc_macro::TokenStream;
use quote::quote;
use syn::{self};
use syn;
#[proc_macro_derive(CosmicConfigEntry, attributes(version, id))]
#[proc_macro_derive(CosmicConfigEntry, attributes(version, id, cosmic_config_entry))]
pub fn cosmic_config_entry_derive(input: TokenStream) -> TokenStream {
// Construct a representation of Rust code as a syntax tree
// that we can manipulate
@ -12,6 +12,25 @@ pub fn cosmic_config_entry_derive(input: TokenStream) -> TokenStream {
impl_cosmic_config_entry_macro(&ast)
}
fn get_cosmic_config_attrs(field: &syn::Field) -> Result<Option<syn::Type>, syn::Error> {
let mut with = None;
for attr in &field.attrs {
if !attr.path().is_ident("cosmic_config_entry") {
continue;
}
attr.parse_nested_meta(|meta| {
if meta.path.is_ident("with") {
let value = meta.value()?;
with = Some(value.parse()?);
}
Ok(())
})?;
}
Ok(with)
}
fn impl_cosmic_config_entry_macro(ast: &syn::DeriveInput) -> TokenStream {
let attributes = &ast.attrs;
let version = attributes
@ -48,19 +67,54 @@ fn impl_cosmic_config_entry_macro(ast: &syn::DeriveInput) -> TokenStream {
let write_each_config_field = fields.iter().map(|field| {
let field_name = &field.ident;
quote! {
cosmic_config::ConfigSet::set(&tx, stringify!(#field_name), &self.#field_name)?;
let with = match get_cosmic_config_attrs(field) {
Ok(attrs) => attrs,
Err(e) => {
return e.to_compile_error();
}
};
if let Some(with) = with {
quote! {
{
let conv = self.#field_name.clone().into();
cosmic_config::ConfigSet::set::<#with>(&tx, stringify!(#field_name), conv)?;
}
}
} else {
quote! {
cosmic_config::ConfigSet::set(&tx, stringify!(#field_name), &self.#field_name)?;
}
}
});
let get_each_config_field = fields.iter().map(|field| {
let field_name = &field.ident;
let field_type = &field.ty;
quote! {
match cosmic_config::ConfigGet::get::<#field_type>(config, stringify!(#field_name)) {
Ok(#field_name) => default.#field_name = #field_name,
Err(why) if matches!(why, cosmic_config::Error::NoConfigDirectory) => (),
Err(e) => errors.push(e),
let with = match get_cosmic_config_attrs(field) {
Ok(attrs) => attrs,
Err(e) => {
return e.to_compile_error();
}
};
if let Some(with) = with {
quote! {
match cosmic_config::ConfigGet::get::<#with>(config, stringify!(#field_name)) {
Ok(value) => {
default.#field_name = value.into();
}
Err(why) if matches!(why, cosmic_config::Error::NoConfigDirectory) => (),
Err(e) => errors.push(e),
}
}
} else {
quote! {
match cosmic_config::ConfigGet::get::<#field_type>(config, stringify!(#field_name)) {
Ok(#field_name) => default.#field_name = #field_name,
Err(why) if matches!(why, cosmic_config::Error::NoConfigDirectory) => (),
Err(e) => errors.push(e),
}
}
}
});
@ -68,17 +122,39 @@ fn impl_cosmic_config_entry_macro(ast: &syn::DeriveInput) -> TokenStream {
let update_each_config_field = fields.iter().map(|field| {
let field_name = &field.ident;
let field_type = &field.ty;
quote! {
stringify!(#field_name) => {
match cosmic_config::ConfigGet::get::<#field_type>(config, stringify!(#field_name)) {
Ok(value) => {
if self.#field_name != value {
keys.push(stringify!(#field_name));
}
self.#field_name = value;
},
Err(e) => {
errors.push(e);
let with = match get_cosmic_config_attrs(field) {
Ok(attrs) => attrs,
Err(e) => {
return e.to_compile_error();
}
};
if let Some(with) = with {
quote! {
stringify!(#field_name) => {
match cosmic_config::ConfigGet::get::<#with>(config, stringify!(#field_name)) {
Ok(value) => {
let value = value.into();
if self.#field_name != value {
keys.push(stringify!(#field_name));
}
self.#field_name = value;
},
Err(e) => errors.push(e),
}
}
}
} else {
quote! {
stringify!(#field_name) => {
match cosmic_config::ConfigGet::get::<#field_type>(config, stringify!(#field_name)) {
Ok(value) => {
if self.#field_name != value {
keys.push(stringify!(#field_name));
}
self.#field_name = value;
},
Err(e) => errors.push(e),
}
}
}