Nix Add Application

When to use

• •A command or tool is not found
• •A dependency is missing for a project
• •The user asks to add a package or tool
• •You determine a tool is needed to complete a task

Instructions

1. •

   Check for flake.nix and .envrc in the current working directory.

2. •

   If flake.nix exists:

   • •Read the flake.nix to understand its devShell structure
   • •Search nixpkgs for the package: nix search nixpkgs#<name>
   • •Add the package to the devShell (usually in buildInputs or packages)
   • •Preserve the existing structure and style
   • •Remind the user to run direnv reload or re-enter the directory
3. •

   If no flake.nix exists:

   • •Ask the user if a flake.nix should be created
   • •If yes, create a minimal flake with a devShell containing the requested package
   • •Also create .envrc with use flake if it doesn't exist
   • •Add .direnv to .gitignore if not already present

Minimal flake template

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { nixpkgs, flake-utils, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
      in
      {
        devShells.default = pkgs.mkShell {
          packages = with pkgs; [
            # packages here
          ];
        };
      });
}