narrative-macros 0.2.0

Procedural macros for the narrative crate
Documentation 
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use proc_macro2::TokenStream;
use quote::quote;

use crate::{item_story::StoryStep, Asyncness};

/// This does not emits `;` or body.
pub(crate) fn generate(item_story: &StoryStep, asyncness: Asyncness) -> TokenStream {
    let fn_name = &item_story.inner.sig.ident;
    let inputs_tokens = item_story
        .inner
        .sig
        .inputs
        .iter()
        .filter(|input| matches!(input, syn::FnArg::Typed(_)));
    let output = match asyncness {
        Asyncness::Sync => quote!(Result<(), Self::Error>),
        Asyncness::Async => {
            quote!(impl std::future::Future<Output = Result<(), Self::Error>> + Send)
        }
    };
    quote! {
        fn #fn_name(&mut self #(,#inputs_tokens)*) -> #output
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_generate_step_fn_blank() {
        let item_story = syn::parse_quote! {
            #[step("Step 1")]
            fn step1();
        };
        let actual = generate(&item_story, Asyncness::Sync);
        let expected = quote! {
            fn step1(&mut self) -> Result<(), Self::Error>
        };
        assert_eq!(actual.to_string(), expected.to_string());
    }

    #[test]
    fn test_generate_step_fn_with_inputs() {
        let item_story = syn::parse_quote! {
            #[step("Step 1")]
            fn step1(a: i32, b: i32);
        };
        let actual = generate(&item_story, Asyncness::Sync);
        let expected = quote! {
            fn step1(&mut self, a: i32, b: i32) -> Result<(), Self::Error>
        };
        assert_eq!(actual.to_string(), expected.to_string());
    }

    #[test]
    fn test_ignore_receiver() {
        let item_story = syn::parse_quote! {
            #[step("Step 1")]
            fn step1(&self, a: i32, b: i32);
        };
        let actual = generate(&item_story, Asyncness::Sync);
        let expected = quote! {
            fn step1(&mut self, a: i32, b: i32) -> Result<(), Self::Error>
        };
        assert_eq!(actual.to_string(), expected.to_string());
    }

    #[test]
    fn test_async() {
        let item_story = syn::parse_quote! {
            #[step("Step 1")]
            fn step1();
        };
        let actual = generate(&item_story, Asyncness::Async);
        let expected = quote! {
            fn step1(&mut self) -> impl std::future::Future<Output = Result<(), Self::Error>> + Send
        };
        assert_eq!(actual.to_string(), expected.to_string());
    }
}