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Thank you for creating a PR for this. I think it makes sense to tackle this case.
I see you want to introduce a variable filenamePart. I wonder if this might be a bit confusing.

I would propose the following:

• filename: name of the file without any extension
• extname: the entire extension
• extname(N): a specific part of the extension starting from the back

Example path: src/main.ex1.ex2.ex3

• filename: main
• extname: ex1.ex2.ex3
• extname(0): ex3
• extname(1): ex2
• extname(2): ex1
• extname(3): This does not work and would show the template (${extname(3)}) to indicate to the user that his pattern/template is invalid

@benibenj Thanks for the reply and the suggestions!
I've gone and made changes according to your proposal, would love it if you can have a look.

Thanks for making the changes!
We are currently preparing for the release next week (this means no more changes can go in) so I'll review this in June and we can make it part of the June release

Heii @bsShoham, PR looks mostly good. What I've noticed:

• ${extname} doesn't work anymore. Should this maybe just return the entire extension? (file.txt1.txt2 => txt1.txt2)
• When I use an N which is larger then the available extensions it should render ${extname(N)} to indicate to the user that his template has a mistake, however it currently shows just extname(N). (Checkout what happens when you use ${dirname(100)})

• ${filename} use to include all extensions except the last one, we did this because we did not have any support for ${extname(N)} but as we do support it with this PR, it should probably only include the name of the file without an extension. What do you think?

@benibenj Hi, thanks for the reply and the comments, fixed the match return at N larger than extensions amount, and repaired to regex to fix extname.

As far as the behavior for filename, after seeing some comments and other issues, I believe that there are 3 major use cases we would like to support.

The normal case

SomeComponent.tsx => SomeComponent

I believe this is the most common use case, no need to debate there.

The hidden / 3rd party tool files

.gitignore / .eslint.json => .gitignore / .eslint or gitignore / eslint

This is a more complex case, of files that start with ..
I believe we would like to support both of the options above, while being opinionated about which one is through filename
and the other could be using extname. I'm inclined towards keeping the . prefix, though it can go both ways.

The tests

userSignIn.spec.ts - > userSignIn / userSignIn.spec

Also a debatable case, though not as much, since capturing those through pattern (src/**/*.spec.ts) is a more favorable solution,
I believe we should exclude the extension and keep the filename without any extensions (userSignIn)

I kept the filename as is in the meanwhile, I'll add the changes for it after the discussion is done.

First of all, I think the following should always hold:

• original filename = ${filename}.${extname}

I think filename should work in the following way:

• SomeComponent.tsx => SomeComponent
• .eslint.json => .eslint
• userSignIn.spec.ts => userSignIn

.eslint.json and .gitignore are tricky ones, but I think including the dot would make sense, however it would not be possible to map .someFile.json to someFile.json in this case. Only way we could support it is if ${extname} => json but ${extname(-1)} / ${extname(2)} => someFile but this seems a bit weird. Might be fine to not support it from the start and wait to see if there is a common use case for it

@bsShoham I added test so we can make sure the behaviour works as described

@benibenj
Done with the filename changes and made sure all tests pass
Let me know if you can think of other cases I should verify

Thanks @bsShoham for working on this!

great very nice, for nested ext , but what about nested folders and dynamic folders in nextjs for example , like i have folders

src/app/(dashboard)/
        users/
           [username]/
             page.tsx
        page.tsx

    and probably more nested folders like 5-6 folders deep how to customize these dynamic folders 

@Ardian-Hoti similar to ${extname(N)} we also support ${dirname(N)}