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.

1 files changed, 47 insertions, 0 deletions

diff --git a/emacs/guix-guile.el b/emacs/guix-guile.el
new file mode 100644
index 0000000000..af8c7d255a
--- /dev/null
+++ b/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