Add Nix template

[HariAmoor-professional]

Low-hanging fruit for ease of use

We can now nix flake init -t github:srid/haskell-template in the shell and get this template without having to do anything in the browser

[srid]

What it looks like:

Certainly an interesting addition, but I worry about the now even larger flake.nix. Also, the user must manually remove the template from flake.nix as it would serve no purpose in their projects.

If flake templates supported automatic parameter replacement NixOS/nix#4017 (eg: renaming the project, but also removing the template output), I could definitely see a value in having it in here.

[HariAmoor-professional]

I worry about the now even larger flake.nix

Large is fine since it's nicely organized, IMO. Is there any reason why you don't like large?

the user must manually remove the template from flake.nix as it would serve no purpose in their projects

Declare it in a flake-module so that the user can comment out the line in the top-level flake where it gets imported?

If flake templates supported automatic parameter replacement NixOS/nix#4017...

I'll see if I have time to tackle it; it might be a while, but I plan to eventually. Until then, I'm leaving this PR open in draft mode.

[srid]

Gonna close this, since the user can already do git clone https://github.com/srid/haskell-template and get rid of the .git directory for the same effect, without needing us to modify flake.nix.

We can reconsider this if there is tangible value add, such as NixOS/nix#4017

[srid]

@HariAmoor-professional If you are still interested in this, let's do it this way: #120

Otherwise, I'll get to it one day.

[HariAmoor-professional]

Never saw you reopen this haha

Get to it yourself, if you can... Don't have much time these days