modules/devenv/integrations/emacs.nix


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{
  config,
  lib,
  ...
}:
let
  cfg = config.emacs;
  attrs2alist =
    value:
    if lib.isAttrs value then
      "(${
        lib.concatStringsSep "\n" (
          lib.mapAttrsToList (name: value: "(${name} . ${attrs2alist value})") value
        )
      })"
    else
      (
        if lib.isList value then
          "(${lib.concatStringsSep " " value})"
        else
          (if lib.isBool value then (if value then "t" else "nil") else builtins.toString value)
      );
in
{
  options.emacs = {
    enable = lib.mkEnableOption "emacs integration";
    dirLocals = lib.mkOption {
      type = with lib.types; attrsOf (attrsOf anything);
      default = { };
      example =
        # the first example from https://www.gnu.org/software/emacs/manual/html_node/emacs/Directory-Variables.html
        {
          nil = {
            indent-tabs-mode = true;
            fill-column = 80;
            mode = "auto-fill";
          };
          c-mode = {
            c-file-style = ''"BSD"'';
            subdirs = "nil";
          };
          "\"src/imported\"".nil.change-log-default-name = ''"ChangeLog.local"'';
        };
    };
  };

  config.dotfiles.".dir-locals.el".text = lib.mkIf (cfg.dirLocals != { }) (attrs2alist cfg.dirLocals);
}