guix/scripts/guix.in

#!@GUILE@ -s
-*- scheme -*-
!#
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 Mark H Weaver <mhw@netris.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

;; IMPORTANT: We must avoid loading any modules from Guix here,
;; because we need to adjust the guile load paths first.
;; It's okay to import modules from core Guile though.
(use-modules (ice-9 regex)
             (srfi srfi-26))

(let ()
  (define-syntax-rule (push! elt v) (set! v (cons elt v)))

  (define config-lookup
    (let ((config '(("prefix"         . "@prefix@")
                    ("datarootdir"    . "@datarootdir@")
                    ("guilemoduledir" . "@guilemoduledir@")))
          (var-ref-regexp (make-regexp "\\$\\{([a-z]+)\\}")))
      (define (expand-var-ref match)
        (lookup (match:substring match 1)))
      (define (expand str)
        (regexp-substitute/global #f var-ref-regexp str
                                  'pre expand-var-ref 'post))
      (define (lookup name)
        (expand (assoc-ref config name)))
      lookup))

  (define (maybe-augment-load-paths!)
    (unless (getenv "GUIX_UNINSTALLED")
      (let ((module-dir (config-lookup "guilemoduledir")))
        (push! module-dir %load-path)
        (push! module-dir %load-compiled-path))
      (let ((updates-dir (and=> (or (getenv "XDG_CONFIG_HOME")
                                    (and=> (getenv "HOME")
                                           (cut string-append <> "/.config")))
                                (cut string-append <> "/guix/latest"))))
        (when (and updates-dir (file-exists? updates-dir))
          (push! updates-dir %load-path)
          (push! updates-dir %load-compiled-path)))))

  (define (run-guix-main)
    (let ((guix-main (module-ref (resolve-interface '(guix ui))
                                 'guix-main)))
      (apply guix-main (command-line))))

  (maybe-augment-load-paths!)
  (run-guix-main))