Add shen layer

layers/+lang/shen/README.org

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+#+TITLE: Shen contribution layer for Spacemacs
+
+[[file:img/shen.gif]]
+
+* Table of Contents                                                   :TOC@4:
+ - [[#description][Description]]
+ - [[#install][Install]]
+ - [[#keybindings][Keybindings]]
+   - [[#eval][Eval]]
+   - [[#compile][Compile]]
+   - [[#repl][REPL]]
+   - [[#help][Help]]
+
+* Description
+
+Adds support for the [[http://www.shenlanguage.org/][Shen]] programming language via [[https://github.com/eschulte/shen-mode][shen-mode and inf-shen]].
+
+* Install
+
+To use this contribution add it to your =~/.spacemacs=
+
+#+BEGIN_SRC emacs-lisp
+  (setq-default dotspacemacs-configuration-layers '(shen))
+#+END_SRC
+
+* Keybindings
+
+** Eval
+
+| Key Binding | Description                   |
+| =SPC m e l= | Eval last sexp                |
+| =SPC m e d= | Eval defun                    |
+| =SPC m e g= | Eval defun and switch to REPL |
+| =SPC m e r= | Eval region                   |
+| =SPC m e t= | Eval region and swith to REPL |
+
+
+** Compile
+
+| Key Binding | Description                     |
+| =SPC m f=   | Compile file                    |
+| =SPC m d=   | Compile defun                   |
+| =SPC m g=   | Compile defun and swith to REPL |
+
+** REPL
+
+| Key Binding | Description         |
+| =SPC m s i= | Start REPL          |
+| =SPC m s s= | Switch to REPL      |
+| =SPC m s l= | Load file into REPL |
+
+** Help
+
+| Key Binding | Description                 |
+| =SPC m h a= | Show arglist                |
+| =SPC m h s= | Describe symbol             |
+| =SPC m h f= | Show function documentation |
+| =SPC m h v= | Show variable documentation |

layers/+lang/shen/packages.el

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+;;; packages.el --- Shen Layer packages File for Spacemacs
+;;
+;; Copyright (c) 2012-2014 Sylvain Benner
+;; Copyright (c) 2014-2015 Sylvain Benner & Contributors
+;;
+;; Author: Sylvain Benner <sylvain.benner@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+(setq shen-packages
+      '(shen-mode
+        ;; inf-shen is not in GNU ELPA, pending FSF copyright paperwork
+        (inf-shen :location (recipe :fetcher git
+                                    :repo "https://github.com/eschulte/shen-mode.git"
+                                    :files ("inf-shen.el")))))
+
+(defun shen/init-shen-mode ()
+  (use-package shen-mode
+    :defer t
+    :mode "\\.shen\\'"
+    :config
+    (progn
+      (evil-leader/set-key-for-mode 'shen-mode
+        ;; e - eval
+        "mel" 'shen-eval-last-sexp
+        "med" 'shen-eval-defun
+        "meg" 'shen-eval-defun-and-go
+        "mer" 'shen-eval-region
+        "met" 'shen-eval-region-and-go
+
+        ;; compile
+        "mf"  'shen-compile-file
+        "md" 'shen-compile-defun
+        "mg" 'shen-compile-defun-and-go
+
+        ;; s - REPL
+        "msi" 'inferior-shen
+        "mss" 'switch-to-shen
+        "msl" 'shen-load-file
+
+        ;; h - help
+        "mha" 'shen-show-arglist
+        "mhs" 'shen-describe-sym
+        "mhf" 'shen-show-function-documentation
+        "mhv" 'shen-show-variable-documentation))))
+
+(defun shen/init-inf-shen ()
+  (use-package inf-shen
+    :defer t))