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+;;; guix-profiles.el --- Guix profiles
+
+;; 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(defvar guix-user-profile
+  (expand-file-name "~/.guix-profile")
+  "User profile.")
+
+(defvar guix-default-profile
+  (concat (or (getenv "NIX_STATE_DIR") "@guix_localstatedir@/guix")
+          "/profiles/per-user/"
+          (getenv "USER")
+          "/guix-profile")
+  "Default Guix profile.")
+
+(defvar guix-current-profile guix-default-profile
+  "Current profile.")
+
+(defun guix-profile-prompt (&optional default)
+  "Prompt for profile and return it.
+Use DEFAULT as a start directory.  If it is nil, use
+`guix-current-profile'."
+  (let* ((path (read-file-name "Profile: "
+                               (file-name-directory
+                                (or default guix-current-profile))))
+         (path (directory-file-name (expand-file-name path))))
+    (if (string= path guix-user-profile)
+        guix-default-profile
+      path)))
+
+(defun guix-set-current-profile (path)
+  "Set `guix-current-profile' to PATH.
+Interactively, prompt for PATH.  With prefix, use
+`guix-default-profile'."
+  (interactive
+   (list (if current-prefix-arg
+             guix-default-profile
+           (guix-profile-prompt))))
+  (setq guix-current-profile path)
+  (message "Current profile has been set to '%s'."
+           guix-current-profile))
+
+(provide 'guix-profiles)
+
+;;; guix-profiles.el ends here