✨ iterated fn + defer + retry
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11 changed files with 678 additions and 65 deletions
172
comrade-macro/Cargo.lock
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172
comrade-macro/Cargo.lock
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@ -2,28 +2,68 @@
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# It is not intended for manual editing.
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@ -42,6 +82,36 @@ dependencies = [
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"proc-macro2",
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@ -96,3 +166,105 @@ name = "unicode-ident"
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]
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@ -6,6 +6,7 @@ edition = "2024"
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[dependencies]
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proc-macro2 = "1.0.94"
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quote = "1.0.39"
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rand = "0.9.0"
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serde_json = "1.0.140"
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syn = { version = "2.0.99", features = ["full"] }
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@ -1,6 +1,7 @@
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use proc_macro::TokenStream;
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use quote::{format_ident, quote};
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use syn::{FnArg, Ident, ItemFn, Pat, ReturnType, Type, parse_macro_input};
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use rand::Rng;
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use syn::{ExprClosure, FnArg, Ident, ItemFn, Pat, ReturnType, Type, parse_macro_input};
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/// This macro turns this function into a worker.
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///
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@ -271,3 +272,35 @@ pub fn worker(attr: TokenStream, item: TokenStream) -> TokenStream {
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output.into()
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}
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/// A procedural macro that defers execution of a closure until the surrounding scope ends similiarly to Go's defer statement.
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///
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/// # Example
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/// ```
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/// use comrade::defer;
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///
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/// fn main() {
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/// defer!(|| {
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/// println!("This will be executed at the end of the scope.");
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/// });
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/// println!("This runs first.");
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/// }
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/// ```
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///
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/// The `defer!` macro ensures that the provided closure is wrapped in a `Defer` instance, which will execute the closure when the variable goes out of scope.
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#[proc_macro]
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pub fn defer(input: TokenStream) -> TokenStream {
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// Parse the input as a closure expression (|| { ... })
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let closure = parse_macro_input!(input as ExprClosure);
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// Generate a random number for a unique variable name
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let random_number = rand::rng().random_range(1000..9999);
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let rand_ident = format_ident!("{}", format!("defer_{}", random_number));
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// Expand into a let statement that wraps the closure in Defer::new
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let expanded = quote! {
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let #rand_ident = comrade::Defer::new(#closure);
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};
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TokenStream::from(expanded)
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}
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