emacs/guix-helper.scm.in

   1 ;;; GNU Guix --- Functional package management for GNU
   2 ;;; Copyright © 2014 Alex Kost <alezost@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 ;;; Commentary:
  20
  21 ;; This is an auxiliary file for the Emacs UI.  It is used to add Guix
  22 ;; directories to path variables and to load the main code.
  23
  24 ;;; Code:
  25
  26 (use-modules (ice-9 regex)
  27              (srfi srfi-26))
  28
  29 (define %guix-dir)
  30
  31 ;; The code is taken from ‘guix’ executable script
  32 (define (set-paths!)
  33   (define-syntax-rule (push! elt v) (set! v (cons elt v)))
  34
  35   (define config-lookup
  36     (let ((config '(("prefix"         . "@prefix@")
  37                     ("guilemoduledir" . "@guilemoduledir@")))
  38           (var-ref-regexp (make-regexp "\\$\\{([a-z]+)\\}")))
  39       (define (expand-var-ref match)
  40         (lookup (match:substring match 1)))
  41       (define (expand str)
  42         (regexp-substitute/global #f var-ref-regexp str
  43                                   'pre expand-var-ref 'post))
  44       (define (lookup name)
  45         (expand (assoc-ref config name)))
  46       lookup))
  47
  48   (let ((module-dir (config-lookup "guilemoduledir"))
  49         (updates-dir (and=> (or (getenv "XDG_CONFIG_HOME")
  50                                 (and=> (getenv "HOME")
  51                                        (cut string-append <> "/.config")))
  52                             (cut string-append <> "/guix/latest"))))
  53     (push! module-dir %load-compiled-path)
  54     (if (and updates-dir (file-exists? updates-dir))
  55         (begin
  56           (set! %guix-dir updates-dir)
  57           (push! updates-dir %load-path)
  58           (push! updates-dir %load-compiled-path))
  59         (set! %guix-dir module-dir))))
  60
  61 (set-paths!)
  62
  63 (load-from-path "guix-main")
  64