;;; 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
>gnu: ed: Update to 1.15.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-04-03 14:51:49 +0200'>2017-04-03</span></td><td><a href='/guix/commit/gnu/packages/ed.scm?id=1f044d7a910bfe6b3aa264e876418f4a96e0aece'>gnu: ed: Update to 1.14.2.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-01-12 23:28:59 +0100'>2017-01-12</span></td><td><a href='/guix/commit/gnu/packages/ed.scm?id=e9384e3b746eb96beea6d3a9dce5f504825e8baa'>gnu: ed: Update to 1.14.1.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2016-02-15 10:17:46 +0200'>2016-02-15</span></td><td><a href='/guix/commit/gnu/packages/ed.scm?id=ff0c847687ce796d61c94ca07ffa6d646339d095'>gnu: ed: Use 'modify-phases'.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2016-02-15 10:17:45 +0200'>2016-02-15</span></td><td><a href='/guix/commit/gnu/packages/ed.scm?id=5cd2c1e8c1dc3b0a18c2c6d4f2432b81e3a55f75'>gnu: ed: Update to 1.13.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2015-07-10 23:47:08 -0400'>2015-07-10</span></td><td><a href='/guix/commit/gnu/packages/ed.scm?id=302af59fc14c6dc3686a24d4e11429f719c0c7d1'>gnu: ed: Update to 1.12.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2015-04-04 03:46:55 -0400'>2015-04-04</span></td><td><a href='/guix/commit/gnu/packages/ed.scm?id=353fda815e8b7863408857048aff224bbd0716d5'>gnu: ed: Update to 1.11.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2014-09-13 15:36:07 +0200'>2014-09-13</span></td><td><a href='/guix/commit/gnu/packages/ed.scm?id=c5779c931bcfd1073da1031bd8663871a88c2950'>gnu: Synchronize GNU package descriptions with upstream.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2014-03-29 23:15:27 +0100'>2014-03-29</span></td><td><a href='/guix/commit/gnu/packages/ed.scm?id=3f5497ee10e2ae55ce25d527b7352fb6647b14c2'>gnu: ed: Upgrade to 1.10.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-12-01 22:33:23 +0100'>2013-12-01</span></td><td><a href='/guix/commit/gnu/packages/ed.scm?id=79c311b81cd8b12075f4c8028a65787481ee40c5'>gnu: Synchronize descriptions with 'gnumaint'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-10-09 16:14:23 +0200'>2013-10-09</span></td><td><a href='/guix/commit/gnu/packages/ed.scm?id=a22dc0c49aed0babe16ef92ae24847b343b7eb02'>Synchronize package descriptions with the Womb.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>