grimm-nixos-laptop/common/tooling/helix.nix

{
  pkgs,
  config,
  lib,
  ...
}:
let
  inherit (config.grimmShared) enable tooling;
  inherit (lib)
    mkOption
    types
    getExe
    getExe'
    mkIf
    ;
  inherit (pkgs)
    helix
    symlinkJoin
    writeTextDir
    concatTextFile
    makeWrapper
    ;
  inherit (pkgs.writers) writeTOML;

  conf-file-name = "config.toml";
  lang-file-name = "languages.toml";

  helix-conf = symlinkJoin {
    name = "helix-conf";
    paths = [
      (concatTextFile {
        name = "helix-conf-partial";
        destination = "/${conf-file-name}";
        files = [ (writeTOML conf-file-name config.programs.helix.config) ];
      })
      (writeTextDir lang-file-name ''
        [[language]]
        language-servers = ["nixd"]
        name = "nix"

        [language-server.nixd]
        command = "${getExe pkgs.nixd}"
      '')
    ];
  };
  
  helix-wrapped = pkgs.symlinkJoin {
    name = helix.pname;

    paths = [ helix ];
    buildInputs = [ makeWrapper ];
    postBuild = ''
      wrapProgram $out/bin/${helix.meta.mainProgram} --add-flags "-c ${helix-conf}/${conf-file-name}"
    '';
  };
in
{
  config = mkIf (enable && tooling.enable) {
    environment.systemPackages = [ helix-wrapped ];
    environment.sessionVariables.EDITOR = getExe' helix-wrapped "hx";

    programs.helix.config = {
      editor.cursor-shape.insert = "bar";
      theme = "base16_transparent";
      # editor.commands.git = ":sh git";
      # keys.normal.Delete = "delete_selection";
    };
  };

  options.programs.helix = {
    config = mkOption {
      type = types.attrs;
      default = { };
      description = "Helix configuration";
    };
  };
}