66 lines
2.6 KiB
EmacsLisp
66 lines
2.6 KiB
EmacsLisp
;;; -*- lexical-binding: t -*-
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;;; ohai-package.el --- Package system configuration.
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;; Copyright (C) 2015 Bodil Stokke
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;; Author: Bodil Stokke <bodil@bodil.org>
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;; This program 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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;; This program 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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;;; Code:
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;; `(online?)` is a function that tries to detect whether you are online.
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;; We want to refresh our package list on Emacs start if we are.
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(require 'cl)
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(defun online? ()
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(if (and (functionp 'network-interface-list)
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(network-interface-list))
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(some (lambda (iface) (unless (equal "lo" (car iface))
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(member 'up (first (last (network-interface-info
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(car iface)))))))
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(network-interface-list))
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t))
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;; Emacs comes with a package manager for installing more features.
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;; The default package repository doesn't contain much, so we tell it
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;; to use a few more: MELPA and Marmalade.
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(setq package-user-dir (concat dotfiles-dir "elpa"))
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(require 'package)
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(dolist (source '(("melpa" . "http://melpa.org/packages/")
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("marmalade" . "http://marmalade-repo.org/packages/")))
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(add-to-list 'package-archives source t))
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;; To get the package manager going, we invoke its initialise function.
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(package-initialize)
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;; If we're online, we attempt to fetch the package directories if
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;; we don't have a local copy already. This lets us start installing
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;; packages right away from a clean install.
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(when (online?)
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(unless package-archive-contents (package-refresh-contents)))
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;; We're going to try to declare the packages each feature needs as we
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;; define it. To do this, we define a function `(package-require)`
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;; which will fetch and install a package from the repositories if it
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;; isn't already installed. Eg. to ensure the hypothetical package
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;; `ponies` is installed, you'd call `(package-require 'ponies)`.
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(defun package-require (pkg)
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"Install a package only if it's not already installed."
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(when (not (package-installed-p pkg))
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(package-install pkg)))
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(provide 'ohai-package)
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