fh, the official FlakeHub CLI

fh is a scrappy CLI for searching FlakeHub and adding new inputs to your Nix flakes.

Usage

Using fh from FlakeHub:

nix shell "https://flakehub.com/f/DeterminateSystems/fh/*.tar.gz"

Note: This builds fh locally on your computer. Pre-built binaries aren't yet available.

Installation

NixOS

To make the fh CLI readily available on a NixOS system:

{
  description = "My NixOS config.";

  inputs.fh.url = "https://flakehub.com/f/DeterminateSystems/fh/*.tar.gz";
  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.2305.*.tar.gz";

  outputs = { nixpkgs, fh, ... } @ inputs: {
    nixosConfigurations.nixos = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules = [
        {
          environment.systemPackages = [ fh.packages.x86_64-linux.default ];
        }

        # ... the rest of your modules here ...
      ];
    };
  };
}

Demo

Initialize a new flake.nix from scratch

fh init generates a new flake.nix file for you using a combination of:

1. Your responses to interactive questions
2. The contents of the repository in which you run the command.

To create a flake.nix, navigate to the directory where you want to create it and run fh init (or specify a different directory using the --root option). Respond to the prompts it provides you and at the end fh will write a flake.nix to disk.

fh init has built-in support for the following languages:

• Elm
• Go
• Java
• JavaScript
• PHP
• Python
• Ruby
• Rust
• Zig

Note: fh init operates on a best-guess basis and is opinionated in its suggestions. It's intended less as a comprehensive flake creation solution and more as a helpful kickstarter.

Add a flake published to FlakeHub to your flake.nix

fh add adds the most current release of the specified flake to your flake.nix and updates the outputs function to accept it. This would add the current release of Nixpkgs to your flake:

fh add nixos/nixpkgs

The resulting flake.nix would look something like this:

{
  description = "My new flake.";

  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.2305.490449.tar.gz";

  outputs = { nixpkgs, ... } @ inputs: {
    # Fill in your outputs here
  };
}

Searching published flakes

You can search publicly listed flakes using the fh search command and passing in a search query. Here's an example:

fh search rust

+---------------------------------------------------------------------------------+
| Flake                      FlakeHub URL                                         |
+---------------------------------------------------------------------------------+
| astro/deadnix              https://flakehub.com/flake/astro/deadnix             |
| carlthome/ml-runtimes      https://flakehub.com/flake/carlthome/ml-runtimes     |
| ipetkov/crane              https://flakehub.com/flake/ipetkov/crane             |
| kamadorueda/alejandra      https://flakehub.com/flake/kamadorueda/alejandra     |
| nix-community/fenix        https://flakehub.com/flake/nix-community/fenix       |
| nix-community/lanzaboote   https://flakehub.com/flake/nix-community/lanzaboote  |
| nix-community/nix-init     https://flakehub.com/flake/nix-community/nix-init    |
| nix-community/nixpkgs-fmt  https://flakehub.com/flake/nix-community/nixpkgs-fmt |
| nix-community/patsh        https://flakehub.com/flake/nix-community/patsh       |
| ryanccn/nyoom              https://flakehub.com/flake/ryanccn/nyoom             |
+---------------------------------------------------------------------------------+

fh search supports arbitrary search strings. An example:

fh search "rust nixos"

Listing releases

fh list releases provides a list of a flake's releases.

fh list releases nixos/nixpkgs

+------------------------------------------------------------+
| Version                                                    |
+------------------------------------------------------------+
| 0.1.428801+rev-2788904d26dda6cfa1921c5abb7a2466ffe3cb8c    |
| 0.1.429057+rev-42337aad353c5efff4382d7bf99deda491459845    |
| 0.1.429304+rev-27ccd29078f974ddbdd7edc8e38c8c8ae003c877    |
| 0.1.429553+rev-5dc7114b7b256d217fe7752f1614be2514e61bb8    |
| 0.1.429868+rev-a115bb9bd56831941be3776c8a94005867f316a7    |
| ...                                                        |
+------------------------------------------------------------+

Listing flakes, organizations, and versions

fh list flakes, fh list orgs, and fh list versions enumerate flakes, organizations, and flake versions on FlakeHub, respectively.

List flakes

fh list flakes

+---------------------------------------------------------------------------------------------------------------+
| Flake                                     FlakeHub URL                                                        |
+---------------------------------------------------------------------------------------------------------------+
| ajaxbits/audiobookshelf                   https://flakehub.com/flake/ajaxbits/audiobookshelf                  |
| ajaxbits/tone                             https://flakehub.com/flake/ajaxbits/tone                            |
| astro/deadnix                             https://flakehub.com/flake/astro/deadnix                            |
| ...                                       ...                                                                 |
+---------------------------------------------------------------------------------------------------------------+

List orgs

fh list orgs

+-------------------------------------------------------------------------+
| Organization            FlakeHub URL                                    |
+-------------------------------------------------------------------------+
| ajaxbits                https://flakehub.com/org/ajaxbits               |
| astro                   https://flakehub.com/org/astro                  |
| ...                     ...                                             |
+-------------------------------------------------------------------------+

List versions

Your can list versions of a flake by passing the flake name and a version requirement to fh list versions:

fh list versions <flake> <version_req>

Here's an example:

fh list versions DeterminateSystems/flake-checker "0.1.*"

+------------------------------------------------------------------------------------------------------+
| Simplified version  FlakeHub URL                                                        Full version |
+------------------------------------------------------------------------------------------------------+
| 0.1.0               https://flakehub.com/flake/DeterminateSystems/flake-checker/0.1.0   0.1.0        |
| 0.1.1               https://flakehub.com/flake/DeterminateSystems/flake-checker/0.1.1   0.1.1        |
| 0.1.2               https://flakehub.com/flake/DeterminateSystems/flake-checker/0.1.2   0.1.2        |
| ...                 ...                                                                 ...          |
+------------------------------------------------------------------------------------------------------+

List by label

You can list flakes by label using the fh list label comand:

fh list label <label>

Here's an example:

fh list label python

+-------------------------------------------------------------------------------+
| Flake                     FlakeHub URL                                        |
+-------------------------------------------------------------------------------+
| nix-community/poetry2nix  https://flakehub.com/flake/nix-community/poetry2nix |
+-------------------------------------------------------------------------------+

Shell completion

You can generate shell completion scripts using the fh completion command:

fh completion <shell>

Here's an example:

fh completion bash

These shells are supported:

• Bash
• Elvish
• Fish
• Powershell
• zsh

A note on automation

Piping fh list commands to another program emits CSV instead of the stylized table.

You can apply the --json flag to each list command to produce JSON output.

License

Apache 2.0

Support

For support, email support@flakehub.com or join our Discord.