;;; 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:

(require 'cl-lib)
(require 'guix-config)

(defgroup guix-external nil
  "Settings for external programs."
  :group 'guix)

(defcustom guix-guile-program guix-config-guile-program
  "Name of the 'guile' executable used for Guix REPL.
May be either a string (the name of the executable) or a list of
strings of the form:

  (NAME . ARGS)

Where ARGS is a list of arguments to the guile program."
  :type 'string
  :group 'guix-external)

(defcustom guix-dot-program
  (if (file-name-absolute-p guix-config-dot-program)
      guix-config-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")))
  (cl-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)
                   "guix-emacs-graph-"))
          ".png"))

(provide 'guix-external)

;;; guix-external.el ends here
70e138a515dfe9c3b5b5399dbd91c228'>services: avahi: Depend on 'user-processes'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/avahi.scm (avahi-shepherd-service): Add 'user-processes'
to 'requirement'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-19 06:09:01 +0100'>2020-01-19</span></td><td><a href='/guix/commit/gnu/services/avahi.scm?id=f460f8da68f915dee5aa3ce97e05ba38c92f3106'>gnu: Use HTTPS for avahi.org everywhere.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/avahi.scm (avahi)[home-page]: Use HTTPS.
* gnu/services/avahi.scm (avahi-service): Likewise in docstring.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-01-16 14:07:37 +0100'>2019-01-16</span></td><td><a href='/guix/commit/gnu/services/avahi.scm?id=2e04ab7147948b51d4e437ca9ba910530ac2a788'>services: avahi: Deprecate the 'avahi-service' procedure.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/avahi.scm (&lt;avahi-configuration&gt;): Export getters.  Add
default values.
(avahi-service-type)[default-value]: New field.
(avahi-service): Mark as deprecated.
* gnu/services/desktop.scm (%desktop-services): Use the 'service' form
instead of calling 'avahi-service'.
* gnu/tests/base.scm (%avahi-os): Likewise.
* doc/guix.texi (Base Services): Adjust example accordingly.
(Networking Services): Update accordingly.
</span></span></td><td>Ludovic Courtès</td></tr>