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path: root/modules/home-manager/personal/programs/emacs.nix
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{
  config,
  lib,
  pkgs,
  ...
}:

let
  cfg = config.programs.emacs;
  spacemacs-update-script = pkgs.callPackage (
    { emacs, git }:
    pkgs.writeShellApplication {
      name = "spacemacs-update";

      runtimeInputs = [
        emacs
        git
      ];

      text = ''
        git checkout develop
        git pull
        git checkout local
        git merge develop
        emacs --fg-daemon=update-daemon \
              --eval '(progn
                        (configuration-layer/update-packages "no-confirmation")
                        (spacemacs/kill-emacs))'
      '';
    }
  ) { emacs = cfg.package; };
in
{
  config = lib.mkIf cfg.enable {

    services.emacs = {
      enable = lib.mkDefault true;
      client.enable = lib.mkDefault true;
      startWithUserSession = lib.mkDefault true;
      package =
        let
          emacs = config.programs.emacs.finalPackage;
        in
        pkgs.runCommand "emacsWrapped"
          {
            nativeBuildInputs = with pkgs; [ makeWrapper ];
          }
          ''
            mkdir "$out"
            ln -s ${emacs}/share "$out"
            for binary in ${emacs}/bin/*
            do
              makeWrapper "$binary" "$out"/bin/$(basename "$binary")\
                          --prefix PATH : ${
                            lib.makeBinPath (
                              with pkgs;
                              [
                                gnutar
                                gcc
                              ]
                            )
                          }
            done
          '';
    };
    home.sessionVariables.EDITOR = "emacsclient --tty";
    home.shellAliases.editor = "emacsclient --create-frame";

    # spacemacs dotfile
    home.file.".spacemacs.d/init.el".source = lib.mkDefault config.personal.home.dotfiles.spacemacs;

    # service to update spacemacs
    systemd.user = (
      pkgs.personal.lib.homeManager.serviceWithTimer "spacemacs-update" {
        Unit = {
          Description = "Update Spacemacs by pulling the develop branch";
          After = [
            "network-online.target"
            "emacs.service"
          ];
        };
        Service = {
          Type = "oneshot";
          WorkingDirectory = "${config.home.homeDirectory}/.emacs.d/";
          ExecStart = "${spacemacs-update-script}/bin/spacemacs-update";
        };
        Timer = {
          Persistent = true;
          OnCalendar = "daily";
        };
        Install = {
          WantedBy = [ "default.target" ];
        };
      }
    );
  };
}