clappen 0.1.3

Clap flatten prefix macro
Documentation 
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use proc_macro2::TokenStream;
use quote::{quote, ToTokens};
use std::str::FromStr;
use syn::spanned::Spanned;
use syn::{parse_quote, Ident, ItemImpl};

use super::ProcessItem;
use crate::helper;

impl ProcessItem for ItemImpl {
    fn process(
        &mut self,
        default_prefix: String,
        attrs_prefix: String,
        prefixed_fields: Vec<String>,
    ) -> syn::Result<TokenStream> {
        let item = &self;
        let mut self_ty = item.self_ty.to_token_stream();

        let prefix = helper::snake_case(helper::prefix(&[
            default_prefix.as_str(),
            attrs_prefix.as_str(),
        ]));

        // handle impl ty prefix
        if !prefix.is_empty() {
            let mut ident = item.self_ty.to_token_stream().to_string();
            ident.insert_str(0, &helper::camel_case(prefix.to_owned()));

            self_ty = Ident::new(&ident, ident.span()).to_token_stream();
        }

        // handle renaming of self fields references
        if !prefix.is_empty() {
            for i in self.items.iter_mut() {
                for field in &prefixed_fields {
                    let content = i.to_token_stream().to_string();

                    let origin = format!("self.{}", field);
                    let replace = format!("self.{}_{}", prefix, field);
                    let content = content.replace(&origin, &replace);

                    let token = TokenStream::from_str(content.as_str())?;
                    *i = parse_quote! {#token};
                }
            }
        }

        let doc_prefixed_fields = prefixed_fields.join(",");
        let items = &self.items;

        Ok(quote! {
            #[doc=concat!(concat!(" Fields with prefix: [", #doc_prefixed_fields, "]"))]
            impl #self_ty {
                #(#items)*
            }
        })
    }
}