state-shift 1.1.0

Macros for implementing Type-State-Pattern on your structs and methods
Documentation 
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use syn::{punctuated::Punctuated, Attribute, Ident, Token};

/// Helper function to find and remove an attribute by name
fn find_and_remove_attr(attrs: &mut Vec<Attribute>, attr_name: &str) -> Option<Attribute> {
    let pos = attrs
        .iter()
        .position(|attr| attr.path().is_ident(attr_name))?;
    Some(attrs.remove(pos))
}

/// Helper function to modify identifiers based on single-letter or prefixed names
fn modify_args_with_struct_name(
    args: Punctuated<Ident, Token![,]>,
    struct_name: &Ident,
) -> Punctuated<Ident, Token![,]> {
    args.into_iter()
        .map(|ident| {
            if is_single_letter(&ident) {
                ident
            } else {
                Ident::new(&format!("{}{}", struct_name, ident), ident.span())
            }
        })
        .collect()
}

/// Main function to extract and modify macro arguments
pub fn extract_macro_args(
    attrs: &mut Vec<Attribute>,
    macro_name: &str,
    struct_name: &Ident,
) -> Option<Punctuated<Ident, Token![,]>> {
    let attr = find_and_remove_attr(attrs, macro_name)?;
    let args: Punctuated<Ident, Token![,]> =
        attr.parse_args_with(Punctuated::parse_terminated).ok()?;
    Some(modify_args_with_struct_name(args, struct_name))
}

pub fn is_single_letter(ident: &Ident) -> bool {
    ident.to_string().len() == 1
}