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+;;; emacs-guix-ffap.el --- Misc function for Emacs Guix  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2018  Oleg Pykhalov
+
+;; Author: Oleg Pykhalov <go.wigust@gmail.com>
+;; Keywords: local
+
+;; This program 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.
+
+;; This program 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/>.
+
+;;; Commentary:
+
+;; This package provides additional functionality in addition to Emacs
+;; Guix.
+
+;;; Code:
+
+(defcustom guix-package-regexp
+  (rx (one-or-more (or alphanumeric "-" ".")))
+  "Regexp matching Guix store path."
+  :type 'regexp
+  :group 'guix)
+
+(defcustom guix-package-source-regexp
+  (concat guix-package-regexp (rx ".tar" (zero-or-more ".gz")))
+  "Regexp matching Guix package source path."
+  :type 'regexp
+  :group 'guix)
+
+(defcustom guix-store-path-regexp
+  (concat guix-store-directory "/" guix-hash-regexp
+          "-" guix-package-regexp (rx line-end))
+  "Regexp matching Guix store path."
+  :type 'regexp
+  :group 'guix)
+
+(defcustom guix-store-path-package-source-regexp
+  (concat guix-store-directory "/" guix-hash-regexp
+          "-" guix-package-source-regexp (rx line-end))
+  "Regexp matching Guix store path to package source."
+  :type 'regexp
+  :group 'guix)
+
+(defun guix-ffap-store-package-source-path-p (filename)
+  "If FILENAME matches `guix-store-path-regexp', return it."
+  (when (string-match-p guix-store-path-package-source-regexp filename)
+    filename))
+
+(defun guix-ffap-store-path-p (filename)
+  "If FILENAME matches `guix-store-path-regexp', return it."
+  (when (string-match-p guix-store-path-regexp filename) filename))
+
+(provide 'emacs-guix-ffap)
+;;; emacs-guix-ffap.el ends here