Feature Request: Nix

[florerl]

Look into adding Nix, [https://nixos.org/nix/], as a package source.

[gui-dos]

I tried to get the metadata of the available packages by using the following code (you can copy&paste it in a playground):

import Foundation

@discardableResult
func shell(_ cmd: String) -> String {
    let task = Process()
    task.launchPath = "/bin/bash"
    task.arguments = ["-l", "-c", cmd]
    let pipe = Pipe()
    task.standardOutput = pipe
    task.launch()
    task.waitUntilExit()
    let data = pipe.fileHandleForReading.readDataToEndOfFile()
    let output: String = String(data: data, encoding: .utf8) ?? ""
    return output
}

print(shell("/nix/var/nix/profiles/default/bin/nix-env --json -qa python"))

Unfortunately, it doesn't work if you omit the final arg to get the descriptions of all the packages with:

print(shell("/nix/var/nix/profiles/default/bin/nix-env --json -qa"))  // freeze  :(

I will investigate further.