gnu/installer/newt/utils.scm

   1 ;;; GNU Guix --- Functional package management for GNU
   2 ;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
   3 ;;;
   4 ;;; This file is part of GNU Guix.
   5 ;;;
   6 ;;; GNU Guix is free software; you can redistribute it and/or modify it
   7 ;;; under the terms of the GNU General Public License as published by
   8 ;;; the Free Software Foundation; either version 3 of the License, or (at
   9 ;;; your option) any later version.
  10 ;;;
  11 ;;; GNU Guix is distributed in the hope that it will be useful, but
  12 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 ;;; GNU General Public License for more details.
  15 ;;;
  16 ;;; You should have received a copy of the GNU General Public License
  17 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 (define-module (gnu installer newt utils)
  20   #:use-module (ice-9 receive)
  21   #:use-module (newt)
  22   #:export (screen-columns
  23             screen-rows
  24
  25             destroy-form-and-pop
  26             set-screen-size!))
  27
  28 ;; Number of columns and rows of the terminal.
  29 (define screen-columns (make-parameter 0))
  30 (define screen-rows    (make-parameter 0))
  31
  32 (define (destroy-form-and-pop form)
  33   "Destory the given FORM and pop the current window."
  34   (destroy-form form)
  35   (pop-window))
  36
  37 (define (set-screen-size!)
  38   "Set the parameters 'screen-columns' and 'screen-rows' to the number of
  39 columns and rows respectively of the current terminal."
  40   (receive (columns rows)
  41       (screen-size)
  42     (screen-columns columns)
  43     (screen-rows rows)))