[Q] fzf-tab suggestion works with CLI tools installed via Homebrew, but doesn't work with tools installed via Nix

[sondhg]

My system

• OS: Linux Mint.
• Primary package managers: Homebrew and Nix.
• Installed fzf-tab via Manual installation guide

Problem description

For example, let's say I install a CLI tool such as bat, in two ways.

1. Install via Homebrew: brew install bat. When I type bat -- and hit Tab key, fzf-tab suggests the flags available for this CLI tool.
2. Install via Nix: nix-env -iA nixpkgs.bat or nix profile install nixpkgs#bat. When I type bat -- and hit Tab key, fzf-tab does not suggest anything.

I'm an absolute noob at Linux, and I'm new to the Nix package manager so I don't know all the differences between it and Homebrew. My assumption is, Homebrew tends to add installed CLI tools to PATH, so the commands can be "discovered" by fzf-tab. Nix does this in a different way, so fzf-tab does not have info on the packages installed via Nix.

That is only my assumption. I'm not sure how to solve the problem so that fzf-tab can work seamlessly with packages installed via Nix. Any help would be greatly appreciated!