Add Emacs user interface.

* configure.ac (emacsuidir): New variable.
  (AC_CONFIG_FILES): Add 'emacs/guix-init.el', 'emacs/guix-helper.scm'.
* Makefile.am: Include 'emacs.am'.
* emacs.am: New file.
* doc/emacs.texi: New file.
* doc/guix.texi: Include 'emacs.texi'.
* emacs/guix-backend.el: New file.
* emacs/guix-base.el: New file.
* emacs/guix-helper.scm.in: New file.
* emacs/guix-history.el: New file.
* emacs/guix-info.el: New file.
* emacs/guix-init.el.in: New file.
* emacs/guix-list.el: New file.
* emacs/guix-main.scm: New file.
* emacs/guix-utils.el: New file.
* emacs/guix.el: New file.

1 files changed, 64 insertions, 0 deletions

diff --git a/emacs/guix-helper.scm.in b/emacs/guix-helper.scm.in
new file mode 100644
index 0000000000..554d55119f
--- /dev/null
+++ b/emacs/guix-helper.scm.in
@@ -0,0 +1,64 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 Alex Kost <alezost@gmail.com>
+;;;
+;;; 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/>.
+
+;;; Commentary:
+
+;; This is an auxiliary file for the Emacs UI.  It is used to add Guix
+;; directories to path variables and to load the main code.
+
+;;; Code:
+
+(use-modules (ice-9 regex)
+             (srfi srfi-26))
+
+(define %guix-dir)
+
+;; The code is taken from ‘guix’ executable script
+(define (set-paths!)
+  (define-syntax-rule (push! elt v) (set! v (cons elt v)))
+
+  (define config-lookup
+    (let ((config '(("prefix"         . "@prefix@")
+                    ("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))
+
+  (let ((module-dir (config-lookup "guilemoduledir"))
+        (updates-dir (and=> (or (getenv "XDG_CONFIG_HOME")
+                                (and=> (getenv "HOME")
+                                       (cut string-append <> "/.config")))
+                            (cut string-append <> "/guix/latest"))))
+    (push! module-dir %load-compiled-path)
+    (if (and updates-dir (file-exists? updates-dir))
+        (begin
+          (set! %guix-dir updates-dir)
+          (push! updates-dir %load-path)
+          (push! updates-dir %load-compiled-path))
+        (set! %guix-dir module-dir))))
+
+(set-paths!)
+
+(load-from-path "guix-main")
+