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Generic nix builder for gleam applications

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# nix-gleam

Generic nix builder for gleam applications.

Gleam will create a `manifest.toml` file for every project which acts as a lock file and contains package name, version and a sha256 checksum of the package for every dependency. This is enough info for the builder to fetch all dependencies using `fetchHex` in nix.

## Usage

Currently there is only 1 builder which builds a gleam application and supports both `erlang` and `javascript` target (but hard-coded to use nodejs runtime).

### buildGleamApplication

In `flake.nix`:

```nix
{
  description = "My gleam application";

inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nix-gleam = {
      url = "github:arnarg/nix-gleam";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

outputs =
    { nixpkgs, nix-gleam, ... }:
    let
      inherit (nixpkgs) lib;

forEachSystem = lib.genAttrs lib.systems.flakeExposed;
    in
    {
      packages = forEachSystem (system: {
        default = nix-gleam.packages.${system}.buildGleamApplication {
          # The pname and version will be read from the `gleam.toml`
          # file generated by gleam.
          # But this can be overwritten here too:
          # pname = "my-app";
          # version = "1.2.3";

# The target is read from the `gleam.toml` file too.
          # Default is "erlang" if nothing is specified but
          # this can also be overwritten here too:
          # target = "javascript";

# Erlang package can be overridden but defaults to
          # `pkgs.erlang`.
          # erlangPackage = pkgs.erlang_nox;

src = ./.;
        };
      });
    };
}
````

## Examples

### Monorepo

In a monorepo example where sub-directories `backend`, `frontend` and `shared` are all different gleam packages where `backend` and `frontend` have a local path dependency `shared`, the following `flake.nix` can be used in the root of the monorepo.

```nix
{
  description = "My gleam monorepo";

inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nix-gleam = {
      url = "github:arnarg/nix-gleam";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

outputs =
    { nixpkgs, nix-gleam, ... }:
    let
      inherit (nixpkgs) lib;

forEachSystem = lib.genAttrs lib.systems.flakeExposed;
    in
    {
      packages = forEachSystem (system:
        let
          inherit (nix-gleam.packages.${system}) buildGleamApplication;
        in
        {
          # Backend application
          backend = buildGleamApplication {
            src = ./backend;
            # Inform the builder to use `./shared`
            # as a local package.
            localPackages = [./shared];
          };
          # Frontend application
          frontend = buildGleamApplication {
            src = ./frontend;
            # Inform the builder to use `./shared`
            # as a local package.
            localPackages = [./shared];
          };
        }
      );
    };
}
```

### Rebar3 plugins

Some dependencies will take in erlang dependencies that might need rebar3 plugins to build and will produce build errors like:
```
Errors loading plugin pc. Run rebar3 with DEBUG=1 set to see errors.
```

In such cases rebar3 package used in the build can be overwritten with `rebar3Package`.

```nix
{
  description = "My gleam application";

inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nix-gleam = {
      url = "github:arnarg/nix-gleam";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

outputs =
    { nixpkgs, nix-gleam, ... }:
    let
      inherit (nixpkgs) lib;
      forEachSystem =
        f:
        lib.genAttrs (import systems) (
          system:
          f {
            inherit system;
            pkgs = nixpkgs.packages.${system};
          }
        );
    in
    {
      packages = forEachSystem ({ pkgs, system} : {
        default = nix-gleam.packages.${system}.buildGleamApplication {
          src = ./.;

# Overrides the rebar3 package used, adding
          # plugins using `rebar3WithPlugins`.
          rebar3Package = pkgs.rebar3WithPlugins {
            plugins = with pkgs.beamPackages; [pc];
          };
        };
      });
    };
}
```

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