Add macro example

Author: diego-bearing

better-rust/Cargo.lock

@@ -1,4 +1,4 @@
-workspace = { members = ["solid"] }
+workspace = { members = ["solid", "macros"] }
 [package]
 name = "better-rust"
 version = "0.1.0"

better-rust/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "macros"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+proc-macro = true
+
+[dependencies]
+syn = { version = "*", features = ["full"]}
+quote = "1.0"

better-rust/macros/Cargo.toml

@@ -0,0 +1,21 @@
+use proc_macro::TokenStream;
+use quote::quote;
+use syn;
+
+#[proc_macro_attribute]
+pub fn example(_attr: TokenStream, item: TokenStream) -> TokenStream {
+    let input = syn::parse_macro_input!(item as syn::ItemFn);
+    let ident = input.sig.ident;
+    let name = ident.clone().to_string();
+    let block = input.block;
+
+    let gen = quote! {
+        fn #ident() {
+            println!("running `{}`:\n", #name);
+            #block;
+            println!("-------------\n");
+        }
+    };
+
+    gen.into()
+}

better-rust/macros/src/lib.rs

@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+macros ={ path = "../macros" }

better-rust/solid/Cargo.toml

@@ -1,17 +1,15 @@
-
 fn main() {
-    run_single_responsibility_before();
+    single_responsibility_before();
 
-    run_single_responsibility_after();
+    single_responsibility_after();
 
-    run_open_closed();
+    open_closed();
 
-    run_liskov_substitution();
+    liskov_substitution();
 }
 
-fn run_single_responsibility_before() {
-    println!("running `run_single_responsibility_before`:\n");
-
+#[macros::example]
+fn single_responsibility_before() {
     use solid::single_responsibility_before::*;
 
     let mut order = Order::new();
@@ -22,13 +20,10 @@ fn run_single_responsibility_before() {
 
     println!("{}", order.total_price());
     order.pay("debit", "0372846");
-
-    println!("------------");
 }
 
-fn run_single_responsibility_after() {
-    println!("running `run_single_responsibility_after`:\n");
-
+#[macros::example]
+fn single_responsibility_after() {
     use solid::single_responsibility_after::*;
 
     let mut order = Order::new();
@@ -42,13 +37,10 @@ fn run_single_responsibility_after() {
     let processor = PaymentProcessor {};
 
     processor.pay_debit(&mut order, "0372846");
-
-    println!("------------");
 }
 
-fn run_open_closed() {
-    println!("running `run_open_closed`:\n");
-
+#[macros::example]
+fn open_closed() {
     use solid::open_closed_after::*;
 
     let mut order = Order::new();
@@ -62,13 +54,10 @@ fn run_open_closed() {
     let processor = DebitPaymentProcessor {};
 
     processor.pay(&mut order, "0372846");
-
-    println!("------------");    
 }
 
-fn run_liskov_substitution() {
-    println!("running `run_liskov_substitution`:\n");
-
+#[macros::example]
+fn liskov_substitution() {
     use solid::liskov_substitution_after::*;
 
     let mut order = Order::new();
@@ -82,6 +71,4 @@ fn run_liskov_substitution() {
     let processor = PaypalPaymentProcessor::new("[email protected]");
 
     processor.pay(&mut order);
-
-    println!("------------");    
 }