diff options
| -rw-r--r-- | emacs.am | 1 | ||||
| -rw-r--r-- | emacs/guix-external.el | 72 |
2 files changed, 73 insertions, 0 deletions
diff --git a/emacs.am b/emacs.am index 0f1ac946de..5d3cb81257 100644 --- a/emacs.am +++ b/emacs.am @@ -23,6 +23,7 @@ ELFILES = \ emacs/guix-base.el \ emacs/guix-command.el \ emacs/guix-emacs.el \ + emacs/guix-external.el \ emacs/guix-help-vars.el \ emacs/guix-history.el \ emacs/guix-info.el \ diff --git a/emacs/guix-external.el b/emacs/guix-external.el new file mode 100644 index 0000000000..d233473abe --- /dev/null +++ b/emacs/guix-external.el @@ -0,0 +1,72 @@ +;;; guix-external.el --- External programs -*- 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 auxiliary code for running external programs. + +;;; Code: + +(defgroup guix-external nil + "Settings for external programs." + :group 'guix) + +(defcustom guix-dot-program (executable-find "dot") + "Name of the 'dot' executable." + :type 'string + :group 'guix-external) + +(defcustom guix-dot-default-arguments + '("-Tpng") + "Default arguments for 'dot' program." + :type '(repeat string) + :group 'guix-external) + +(defcustom guix-dot-file-name-function #'guix-png-file-name + "Function used to define a file name of a temporary 'dot' file. +The function is called without arguments." + :type '(choice (function-item guix-png-file-name) + (function :tag "Other function")) + :group 'guix-external) + +(defun guix-dot-arguments (output-file &rest args) + "Return a list of dot arguments for writing a graph into OUTPUT-FILE. +If ARGS is nil, use `guix-dot-default-arguments'." + (or guix-dot-program + (error (concat "Couldn't find 'dot'.\n" + "Set guix-dot-program to a proper value"))) + (apply #'list + guix-dot-program + (concat "-o" output-file) + (or args guix-dot-default-arguments))) + +(defun guix-dot-file-name () + "Call `guix-dot-file-name-function'." + (funcall guix-dot-file-name-function)) + +(defun guix-png-file-name () + "Return '.png' file name in the `temporary-file-directory'." + (concat (make-temp-name + (concat (file-name-as-directory temporary-file-directory) + "graph-")) + ".png")) + +(provide 'guix-external) + +;;; guix-external.el ends here |