;; Save opened frames as a session parameter "frame-list".

  ;; Exclude `selected-frame' and daemon one (if any).

  ;; http://stackoverflow.com/questions/21151992/why-emacs-as-daemon-gives-1-more-frame-than-is-opened

  (if wg-control-frames

      (let ((fl (frame-list)))

        ;; TODO: remove using dash

        (mapc (lambda (frame)

                (if (string-equal "initial_terminal" (terminal-name frame))

                    (delete frame fl))) fl)

        (setq fl (delete (selected-frame) fl))

        (let (wg-flag-modified)

  (wg-write-sexp-to-file (wg-pickel-all-session-parameters) filename)

  (wg-fontified-message (:cmd "Wrote: ") (:file filename))

  (wg-mark-everything-unmodified))

(defalias 'wg-write-session-file 'wg-save-session-as)

(defun wg-get-session-file ()

  "Return the filename in which to save the session."

  (or (aif (wg-current-session t) (wg-session-file-name it))

      wg-session-file))

;;(read-file-name (format "Save session as [%s]: " wg-session-file))

(defun wg-save-session (&optional force)

    (setf (wg-workgroup-modified workgroup) nil)))

(defun wg-session-parameter (parameter &optional default session)

  "Return session's value for PARAMETER.

If PARAMETER is not found, return DEFAULT which defaults to nil.

SESSION nil defaults to the current session."

  (wg-aget (wg-session-parameters (or session (wg-current-session)))

           parameter default))

(defun wg-set-session-parameter (parameter value &optional session)

  "Set PARAMETER to VALUE in SESSION.

SESSION nil means use the current session.  Return value."

    (wg-set-parameter (wg-session-parameters session) parameter value)

    (wg-flag-session-modified session)

    value))

(defun wg-remove-session-parameter (parameter &optional session)

  "Remove parameter PARAMETER from SESSION's parameters."

  (let ((session (or session (wg-current-session))))

    (wg-asetf (wg-session-parameters session) (wg-aremove it parameter))

    (wg-flag-session-modified session)))

(defun wg-session-local-value (variable &optional session)

  "Return the value of VARIABLE in SESSION.