Add kebab-case macro

[TYTheBeast]

Would be really helpful if there was also a kebab-case macro, as I need it for my project in order to maintain consistency for command line arguments' format.
casey does not currently implement a kebab-case macro.

[jordy25519]

hi @TYTheBeast , thanks for the issue.
I think kebab-case may not work as it generates syntactically invalid rust code (can't compile)

could you explain your usecase a little more?
maybe a crate like heck would be more suitable here? https://crates.io/crates/heck

[TYTheBeast]

Hiya jordy, my use case is in a macro in a project I've been working on, specifically this file, where I'd need the generated to string format to be kebab-case in order to keep the command line arguments for the search_item binary consistent, as the sort by arguments are kebab-case but the min/max arguments are lowercase.

My main use case is together with stringify in the macro. The issue is that in https://github.com/TYTheBeast/WynnBuilderTools-Rekindled/blob/master/src/args/item_search_args.rs in the parse_key_val_sort_by function, I have to parse from a format, currently lowercase, to my custom generated enum.
I'm no Rust expert, so perhaps you may know of a better approach? Let me know, I'm open for alternatives as well.

[jordy25519]

maybe better to convert the input string into camelcase, rather than the enum variant into kebab-case e.g:

diff --git a/src/args/generate_sort_by.rs b/src/args/generate_sort_by.rs
index 962c049..109bfbf 100644
--- a/src/args/generate_sort_by.rs
+++ b/src/args/generate_sort_by.rs
@@ -10,8 +10,9 @@ macro_rules! generate_sort_by {
             type Err = String;

             fn from_str(s: &str) -> Result<Self, Self::Err> {
-                match s.to_lowercase().as_str() {
-                    $(lower!(stringify!($variant)) => Ok(SortAndFilterBy::$variant),)*
+                use heck::ToUpperCamelCase;
+                match s.to_upper_camel_case().as_str() {
+                    $(stringify!($variant) => Ok(SortAndFilterBy::$variant),)*
                     _ => Err(format!("Unknown sort criterion: {}", s)),
                 }
             }

marking this as won't fix since kebab-case would create invalid rust syntax