72 lines
2.3 KiB
EmacsLisp
72 lines
2.3 KiB
EmacsLisp
;;; guix-external.el --- External programs -*- lexical-binding: t -*-
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;; Copyright © 2015 Alex Kost <alezost@gmail.com>
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;; This file is part of GNU Guix.
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;; GNU Guix is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Guix is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This file provides auxiliary code for running external programs.
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;;; Code:
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(defgroup guix-external nil
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"Settings for external programs."
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:group 'guix)
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(defcustom guix-dot-program (executable-find "dot")
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"Name of the 'dot' executable."
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:type 'string
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:group 'guix-external)
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(defcustom guix-dot-default-arguments
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'("-Tpng")
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"Default arguments for 'dot' program."
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:type '(repeat string)
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:group 'guix-external)
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(defcustom guix-dot-file-name-function #'guix-png-file-name
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"Function used to define a file name of a temporary 'dot' file.
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The function is called without arguments."
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:type '(choice (function-item guix-png-file-name)
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(function :tag "Other function"))
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:group 'guix-external)
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(defun guix-dot-arguments (output-file &rest args)
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"Return a list of dot arguments for writing a graph into OUTPUT-FILE.
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If ARGS is nil, use `guix-dot-default-arguments'."
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(or guix-dot-program
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(error (concat "Couldn't find 'dot'.\n"
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"Set guix-dot-program to a proper value")))
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(apply #'list
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guix-dot-program
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(concat "-o" output-file)
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(or args guix-dot-default-arguments)))
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(defun guix-dot-file-name ()
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"Call `guix-dot-file-name-function'."
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(funcall guix-dot-file-name-function))
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(defun guix-png-file-name ()
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"Return '.png' file name in the `temporary-file-directory'."
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(concat (make-temp-name
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(concat (file-name-as-directory temporary-file-directory)
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"graph-"))
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".png"))
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(provide 'guix-external)
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;;; guix-external.el ends here
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