emacs: Move guile related code to "guix-guile.el".

* emacs/guix-backend.el (guix-make-guile-expression): Move to...
* emacs/guix-guile.el: ... here.  New file.
* emacs/guix-base.el: Use it.
* emacs/guix-command.el: Use it.
* emacs.am (ELFILES): Add it.

emacs.am

@@ -25,6 +25,7 @@ ELFILES =					\
   emacs/guix-command.el				\
   emacs/guix-emacs.el				\
   emacs/guix-external.el			\
+  emacs/guix-guile.el				\
   emacs/guix-help-vars.el			\
   emacs/guix-history.el				\
   emacs/guix-info.el				\

emacs/guix-backend.el

@@ -305,24 +305,6 @@ additional internal REPL if it exists."
 (defvar guix-operation-buffer nil
   "Buffer from which the latest Guix operation was performed.")
 
-(defun guix-make-guile-expression (fun &rest args)
-  "Return string containing a guile expression for calling FUN with ARGS."
-  (format "(%S %s)" fun
-          (mapconcat
-           (lambda (arg)
-             (cond
-              ((null arg) "'()")
-              ((or (eq arg t)
-                   ;; An ugly hack to separate 'false' from nil
-                   (equal arg 'f)
-                   (keywordp arg))
-               (concat "#" (prin1-to-string arg t)))
-              ((or (symbolp arg) (listp arg))
-               (concat "'" (prin1-to-string arg)))
-              (t (prin1-to-string arg))))
-           args
-           " ")))
-
 (defun guix-eval (str &optional wrap)
   "Evaluate guile expression STR.
 If WRAP is non-nil, wrap STR into (begin ...) form.

emacs/guix-base.el

@@ -30,6 +30,7 @@
 (require 'cl-lib)
 (require 'guix-profiles)
 (require 'guix-backend)
+(require 'guix-guile)
 (require 'guix-utils)
 (require 'guix-history)
 (require 'guix-messages)

emacs/guix-command.el

@@ -65,6 +65,7 @@
 (require 'guix-help-vars)
 (require 'guix-read)
 (require 'guix-base)
+(require 'guix-guile)
 (require 'guix-external)
 
 (defgroup guix-commands nil

emacs/guix-guile.el

@@ -0,0 +1,47 @@
+;;; guix-guile.el --- Auxiliary tools for working with guile code   -*- lexical-binding: t -*-
+
+;; Copyright © 2015 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/>.
+
+;;; Commentary:
+
+;; This file provides functions for parsing guile code, making guile
+;; expressions, etc.
+
+;;; Code:
+
+(defun guix-make-guile-expression (fun &rest args)
+  "Return string containing a guile expression for calling FUN with ARGS."
+  (format "(%S %s)" fun
+          (mapconcat
+           (lambda (arg)
+             (cond
+              ((null arg) "'()")
+              ((or (eq arg t)
+                   ;; An ugly hack to separate 'false' from nil.
+                   (equal arg 'f)
+                   (keywordp arg))
+               (concat "#" (prin1-to-string arg t)))
+              ((or (symbolp arg) (listp arg))
+               (concat "'" (prin1-to-string arg)))
+              (t (prin1-to-string arg))))
+           args
+           " ")))
+
+(provide 'guix-guile)
+
+;;; guix-guile.el ends here