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+;;; cider-scratch.el --- *scratch* buffer for Clojure -*- lexical-binding: t -*-
+
+;; Copyright © 2014-2018 Bozhidar Batsov and CIDER contributors
+;;
+;; Author: Tim King <kingtim@gmail.com>
+;;         Phil Hagelberg <technomancy@gmail.com>
+;;         Bozhidar Batsov <bozhidar@batsov.com>
+;;         Artur Malabarba <bruce.connor.am@gmail.com>
+;;         Hugo Duncan <hugo@hugoduncan.org>
+;;         Steve Purcell <steve@sanityinc.com>
+
+;; 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/>.
+
+;; This file is not part of GNU Emacs.
+
+;;; Commentary:
+
+;; Imitate Emacs's *scratch* buffer.
+
+;;; Code:
+
+(require 'cider-eval)
+(require 'clojure-mode)
+(require 'easymenu)
+
+(defcustom cider-scratch-initial-message
+  ";; This buffer is for Clojure experiments and evaluation.\n
+;; Press C-j to evaluate the last expression.\n\n"
+  "The initial message displayed in new scratch buffers."
+  :type 'string
+  :group 'cider
+  :package-version '(cider . "0.18.0"))
+
+(defvar cider-clojure-interaction-mode-map
+  (let ((map (make-sparse-keymap)))
+    (set-keymap-parent map clojure-mode-map)
+    (define-key map (kbd "C-j") #'cider-eval-print-last-sexp)
+    (define-key map [remap paredit-newline] #'cider-eval-print-last-sexp)
+    (easy-menu-define cider-clojure-interaction-mode-menu map
+      "Menu for Clojure Interaction mode"
+      '("Clojure Interaction"
+        (["Eval and print last sexp" #'cider-eval-print-last-sexp]
+         "--"
+         ["Reset" #'cider-scratch-reset])))
+    map))
+
+(defconst cider-scratch-buffer-name "*cider-scratch*")
+
+;;;###autoload
+(defun cider-scratch ()
+  "Go to the scratch buffer named `cider-scratch-buffer-name'."
+  (interactive)
+  (pop-to-buffer (cider-scratch-find-or-create-buffer)))
+
+(defun cider-scratch-find-or-create-buffer ()
+  "Find or create the scratch buffer."
+  (or (get-buffer cider-scratch-buffer-name)
+      (cider-scratch--create-buffer)))
+
+(define-derived-mode cider-clojure-interaction-mode clojure-mode "Clojure Interaction"
+  "Major mode for typing and evaluating Clojure forms.
+Like clojure-mode except that \\[cider-eval-print-last-sexp] evals the Lisp expression
+before point, and prints its value into the buffer, advancing point.
+
+\\{cider-clojure-interaction-mode-map}"
+  (setq-local sesman-system 'CIDER))
+
+(defun cider-scratch--insert-welcome-message ()
+  "Insert the welcome message for the scratch buffer."
+  (insert cider-scratch-initial-message))
+
+(defun cider-scratch--create-buffer ()
+  "Create a new scratch buffer."
+  (with-current-buffer (get-buffer-create cider-scratch-buffer-name)
+    (cider-clojure-interaction-mode)
+    (cider-scratch--insert-welcome-message)
+    (current-buffer)))
+
+(defun cider-scratch-reset ()
+  "Reset the current scratch buffer."
+  (interactive)
+  (erase-buffer)
+  (cider-scratch--insert-welcome-message))
+
+(provide 'cider-scratch)
+
+;;; cider-scratch.el ends here