Add option types for top-level commands

extract_macro/Cargo.lock

@@ -0,0 +1,46 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "extract_macro"
+version = "0.1.0"
+dependencies = [
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.78"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.49"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "915aea9e586f80826ee59f8453c1101f9d1c4b3964cd2460185ee8e299ada496"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"

extract_macro/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "extract_macro"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+quote = "1.0.35"
+syn = { version = "2.0.49", features = ["full"] }

extract_macro/src/lib.rs

@@ -0,0 +1,52 @@
+use proc_macro::TokenStream;
+use syn::{spanned::Spanned, Data, Fields};
+
+#[proc_macro_derive(Extract)]
+pub fn extract(input: TokenStream) -> TokenStream {
+    let ast = syn::parse_macro_input!(input);
+
+    impl_extract(&ast)
+}
+
+fn impl_extract(ast: &syn::DeriveInput) -> TokenStream {
+    let name = &ast.ident;
+
+    match &ast.data {
+        Data::Struct(st) => match &st.fields {
+            Fields::Named(fields) => {
+                let extracted = fields.named.iter().map(|field| {
+                    let ident = &field.ident;
+                    let ty = &field.ty;
+
+                    quote::quote_spanned! {field.span()=>
+                        #ident : crate::utils::extract_arg!(ctx, #ident, #ty)
+                    }
+                });
+
+                TokenStream::from(quote::quote! {
+                    impl Extract for #name {
+                        fn extract(ctx: crate::ApplicationContext) -> Self {
+                            Self {
+                                #(#extracted,)*
+                            }
+                        }
+                    }
+                })
+            }
+            Fields::Unit => TokenStream::from(quote::quote! {
+                impl Extract for #name {
+                    fn extract(ctx: crate::ApplicationContext) -> Self {
+                        Self {}
+                    }
+                }
+            }),
+            _ => {
+                panic!("Only named/unit structs can derive Extract");
+            }
+        },
+
+        _ => {
+            panic!("Only structs can derive Extract");
+        }
+    }
+}