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authorAlex Kost <alezost@gmail.com>2015-08-30 18:47:01 +0300
committerAlex Kost <alezost@gmail.com>2015-09-01 13:03:50 +0300
commit70fabd498c275d0d5cb43f2c13f8293b878c8e4e (patch)
tree72569b5941a0ccea6772314e4380b4a769e15062 /emacs/guix-external.el
parent8b9ceb8d03ab7b67cab9ce96b66f197c331ccc04 (diff)
downloadgnu-guix-70fabd498c275d0d5cb43f2c13f8293b878c8e4e.tar
gnu-guix-70fabd498c275d0d5cb43f2c13f8293b878c8e4e.tar.gz
emacs: Add code to run 'dot' program.
* emacs/guix-external.el: New file. * emacs.am (ELFILES): Add it.
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+;;; 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