Add systemd layer

layers/+config-files/systemd/README.org

@@ -0,0 +1,25 @@
+#+TITLE: systemd layer
+#+HTML_HEAD_EXTRA: <link rel="stylesheet" type="text/css" href="../css/readtheorg.css" />
+
+* Table of Contents                                        :TOC_4_org:noexport:
+ - [[Description][Description]]
+ - [[Install][Install]]
+ - [[Key bindings][Key bindings]]
+
+* Description
+This layer provides syntax highlighting for systemd files and completion through
+=company= if the =auto-completion= layer is used.
+
+* Install
+To use this contribution add it to your =~/.spacemacs=
+
+#+begin_src emacs-lisp
+  (setq-default dotspacemacs-configuration-layers '(systemd))
+#+end_src
+
+* Key bindings
+
+| Key Binding   | Description                                                              |
+|---------------+--------------------------------------------------------------------------|
+| ~<SPC> m h d~ | Systemd open the directives documentation                                |
+| ~<SPC> m h o~ | Systemd open documentation (if a =\=Documentation= directive is provided |

layers/+config-files/systemd/packages.el

@@ -0,0 +1,27 @@
+;;; packages.el --- systemd layer packages file for Spacemacs.
+;;
+;; Copyright (c) 2012-2016 Sylvain Benner & Contributors
+;;
+;; Author: Fabien Dubosson <fabien.dubosson@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+(defconst systemd-packages
+  '(systemd)
+  "The list of Lisp packages required by the systemd layer.")
+
+(defun systemd/init-systemd ()
+  (use-package systemd
+    :defer t
+    :init
+    (when (configuration-layer/package-usedp 'company)
+      (setq systemd-use-company-p t))
+    :config
+    (spacemacs/set-leader-keys-for-major-mode 'systemd-mode
+      "hd" 'systemd-doc-directives
+      "ho" 'systemd-doc-open)))
+
+;;; packages.el ends here