neovim-flake/config/plugins/formatters.nix

# Code formatters
{pkgs, ...}: {
  extraPackages = with pkgs; [
    # TS/JS, Markdown, TOML, JSON, etc
    nodePackages.prettier

    # Rust
    rustfmt

    # Nix
    nixfmt-rfc-style

    # Python
    black

    # Lua
    stylua

    # Haskell
    haskellPackages.fourmolu

    # Misc
    # codespell
  ];

  plugins.conform-nvim = {
    enable = true;
    settings = {
      format_on_save = {
        timeoutMs = 500;
        lspFallback = true;
      };
      formatters_by_ft = {
        lua = ["stylua"];
        python = ["black"];
        nix = ["nixfmt"];
        svelte = ["prettier"];
        rust = ["rustfmt"];
        haskell = ["fourmolu"];
        toml = ["prettier"];
        json = ["prettier"];
        markdown = ["prettier"];
        yaml = ["prettier"];
        html = ["prettier"];
        javascript = ["prettier"];
        typescript = ["prettier"];
        # "*" = ["codespell"];
        "_" = ["trim_whitespace"];
      };
    };
  };
}