Add elisp-mode

For now, this one just adds an advice to be able to use "RET" in
insert state during an expansion of a long s-exp.

See eval-print-last-sexp and last-sexp-setup-props.

evil-collection.el

@@ -53,6 +53,7 @@
     doc-view
     edebug
     elfeed
+    elisp-mode
     elisp-refs
     emms
     eshell

evil-elisp-mode.el

@@ -0,0 +1,57 @@
+;;; evil-elisp-mode.el --- Bindings for `elisp-mode'. -*- lexical-binding: t -*-
+
+;; Copyright (C) 2017 James Nguyen
+
+;; Author: James Nguyen <james@jojojames.com>
+;; Maintainer: James Nguyen <james@jojojames.com>
+;; Pierre Neidhardt <ambrevar@gmail.com>
+;; URL: https://github.com/jojojames/evil-collection
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "25.1"))
+;; Keywords: evil, elisp
+
+;; This program 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.
+
+;; This program 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:
+;;; Bindings for `elisp-mode'.
+
+;;; Code:
+(require 'elisp-mode)
+(require 'evil)
+
+(defun evil-collection-last-sexp-setup-props (beg end value alt1 alt2)
+  "Set up text properties for the output of `elisp--eval-last-sexp'.
+BEG and END are the start and end of the output in current-buffer.
+VALUE is the Lisp value printed, ALT1 and ALT2 are strings for the
+alternative printed representations that can be displayed."
+  (let ((map (make-sparse-keymap)))
+    (define-key map "\C-m" 'elisp-last-sexp-toggle-display)
+    (define-key map [down-mouse-2] 'mouse-set-point)
+    (define-key map [mouse-2] 'elisp-last-sexp-toggle-display)
+    (evil-define-key 'insert map "\C-m"
+      (lookup-key (current-global-map) (kbd "RET")))
+    (add-text-properties
+     beg end
+     `(printed-value (,value ,alt1 ,alt2)
+                     mouse-face highlight
+                     keymap ,map
+                     help-echo "RET, mouse-2: toggle abbreviated display"
+                     rear-nonsticky (mouse-face keymap help-echo
+                                                printed-value)))))
+(defun evil-elisp-mode-setup ()
+  (advice-add 'last-sexp-setup-props
+              :override #'evil-collection-last-sexp-setup-props))
+
+(provide 'evil-elisp-mode)
+;;; evil-elisp-mode.el ends here