24 lines
641 B
Rust
24 lines
641 B
Rust
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extern crate proc_macro;
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use proc_macro::TokenStream;
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use quote::quote;
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use syn::{parse_macro_input, DeriveInput};
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#[proc_macro_derive(ConfigOption)]
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pub fn derive(input: TokenStream) -> TokenStream {
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let DeriveInput { ident, .. } = parse_macro_input!(input as DeriveInput);
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let result = quote! {
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impl From<&Config> for Option<#ident> {
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fn from(config: &Config) -> Self {
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match config.values.get(&ConfigName::#ident) {
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Some(ConfigOption::#ident(val)) => Some(val.clone()),
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_ => None,
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}
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}
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}
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};
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result.into()
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}
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