nixosModules: autogenerate list of modules

[arthsmn]

Created a function that creates a list of all the modules inside the programs folder. If other folders are used in the future, this function can be easily modified to be applied to each folder by mapping it.

Basically, this function reads the directory, filters all files that are "regular", picks their names (paths) and puts the parent directory in the path. When/if the pipe operator becomes stable we can use it instead of lib.pipe, making it cleaner.

Removed the programs/default.nix, as it isn't necessary anymore. Also, modified the module call in flake.nix to handle a function that receives a lib argument, as nixpkgs' lib is necessary.

[arthsmn]

Sorry, missclicked!

[Lunarnovaa]

Hi! This looks fine for what it is, but it doesn't import files recursively (namely, if I have a file modules/programs/firefox/file.nix, it's not imported). Not a major issue, but limits us in terms of structure. While trying to modify the function, I stumbled across lib.filesystem.listFilesRecursive, which actually heavily simplifies the imports syntax and function.

My commits will be pushed to your branch and this PR will be merged. Thanks for your contribution :)

[arthsmn]

Hi! This looks fine for what it is, but it doesn't import files recursively (namely, if I have a file modules/programs/firefox/file.nix, it's not imported). Not a major issue, but limits us in terms of structure. While trying to modify the function, I stumbled across lib.filesystem.listFilesRecursive, which actually heavily simplifies the imports syntax and function.

My commits will be pushed to your branch and this PR will be merged. Thanks for your contribution :)

Thanks for the suggestion, I didn't even know such function existed lol.