This adds support for using nix flakes commands with hix. This is done by creating a hidden `.hix-flake` directory and passing the source in using `--override-input`.
It also includes a `hix init` command to add a `flake.nix` and `nix/hix.nix` configuration file.
The `hix` tools are wrappers for the various `nix` tools that
use `haskell.nix` without the need to add any `.nix` files.
This is useful for:
* A quick way to try out haskell.nix for new users.
* Using haskell.nix to work on projects that do not have
`.nix` files.
* Testing to see if `haskell.nix` can build a project.
* Making `flake` and `non flake` configurations to check `haskell.nix`
treats them the same.
The configuration arguments for `Hix` can be (from highest precedence to lowest):
* Passed on the command line with `--arg` (or `--argstr` for string args).
* Placed in `nix/hix.nix` file in the project dir.
* Placed in `~/.config/hix/hix.conf`
Boilerplate `default.nix`, `shell.nix` and `flake.nix` files can be added to a
a project with a `nix/hix.nix` file to make it work with the standard `Nix`
tools.
Hamish Mackenzie
Stefan Frijters
J.R. Hill
Tom Prince
Hamish Mackenzie
Teo Camarasu