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@acaloiaro Thanks! Looks great, while I need some time to learn Nix firstly 😄

@acaloiaro Thanks! Looks great, while I need some time to learn Nix firstly 😄

Sounds good @cosmtrek. I'm happy to clarify anything if you have questions.

One thing worth considering for this PR is that it serves two uses cases: users and developers.

For users it makes air available as a "flake input" for nix projects that use air. E.g. this allows Nix Flake users to delcare air as an input to their system configurations (make it globablly available), or as an input to projects, so that air is available within that project's "development shell".

For air developers who are also nix users, it allows them to simply run nix develop to get a development shell with all of air's dependencies.

I joined these two user and developer use cases into a single PR, but they could be easy considered in isolation. Selfishly, as a nix user, I want both. But it would be reasonable as a project maintainer to consider them separately.

seems is not out of box

[neo@nixos:~/project/air]$ nix develop
error:
       while calling the 'derivationStrict' builtin

         at /builtin/derivation.nix:9:12: (source not available)

        while evaluating derivation 'devenv-shell'
         whose name attribute is located at /nix/store/y9m0i9f9nk27kgiwwm0nnc72bzr1p55j-source/src/modules/mkNakedShell.nix:63:12

       while evaluating attribute 'shellHook' of derivation 'devenv-shell'

         at /nix/store/y9m0i9f9nk27kgiwwm0nnc72bzr1p55j-source/src/modules/mkNakedShell.nix:78:5:

           77|     # requires that other trampoline.
           78|     shellHook = ''
             |     ^
           79|       ${lib.optionalString debug "set -x"}

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: devenv was not able to determine the current directory.
       Make sure Nix runs with the `--impure` flag.

       See https://devenv.sh/guides/using-with-flakes/

No demand for this feature.