dotfiles/nix/home/programs/helix/default.nix

{ pkgs, ...}:
let
  # We need a version of vscode-language-servers that's less than 4.10
  oldNixpkgs = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/f68797befe20fc56153363e71ea0f0b74542db4b.tar.gz") {};
in
{
  programs.helix = {
    enable = true;
    languages = {
      language-server = {
        nixd = {
          command = "${pkgs.nixd}/bin/rnix-lsp";
        };

        typescript-language-server = {
          command = "${pkgs.typescript-language-server}/bin/typescript-language-server";
          args = [ "--stdio" ];
          config.hostInfo = "helix";
        };

        eslint = {
          command = "${oldNixpkgs.nodePackages.vscode-langservers-extracted}/bin/vscode-eslint-language-server";
          args = ["--stdio"];
          config = {
            run = "onType";
            validate = "on";
            nodePath = "";
            rulesCustomizations = [];
            workingDirectory.mode = "location";
            showDocumentation.enable = true;
            experimental = { useFlatConfig = false; };
            problems = { shortenToSingleLine = false; };
            codeAction = {
              enable = true;
              location = "separateLine";
            };
          };
        };
      };

      language = [
        {
          name = "nix";
          auto-format = true;
          language-servers = [
            { name = "nixd"; }
          ];
        }
        {
          name = "typescript";
          file-types = [ "tsx" "ts" ];
          auto-format = true;
          formatter = { command = "prettier"; args = ["--parser=typescript"]; };
          language-servers = [
            { name = "eslint"; }
            {
              name = "typescript-language-server";
            }
          ];
        }
      ];
    };
    settings = {
      theme = "catppuccin_mocha";
      editor = {
        line-number = "relative";
        lsp.display-messages = true;
        cursor-shape = {
          insert = "underline";
          normal = "block";
          select = "block";
        };
        bufferline = "multiple";
      };
      keys = {
        normal = {
          g = { a = "code_action"; }; # Maps `ga` to show possible code actions
          "ret" = [ "move_line_down" "goto_first_nonwhitespace" ]; # Maps the enter key to move to start of next line
          X = "extend_line_above";
          D = "delete_char_backward";
          "S-ret" = [ "move_line_up" "goto_first_nonwhitespace" ];
        };
        insert = {
          j = { j = "normal_mode"; }; # Maps `jj` to exit insert mode
        };
      };

    };
  };
}