diff -r f3334abf4322 -r e848f1863d6b elisp/stack-mode/checklist.el
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/elisp/stack-mode/checklist.el	Wed Sep 16 16:53:07 2015 -0500
@@ -0,0 +1,94 @@
+;;; checklist.el --- Simple checklist UI functionality
+
+;; Copyright (c) 2015 Chris Done. All rights reserved.
+
+;; This file 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, or (at your option)
+;; any later version.
+
+;; This file 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/>.
+
+;;; Code:
+
+(defvar checklist-read-checklist-result nil)
+(make-variable-buffer-local 'checklist-read-checklist-result)
+
+(defun checklist-read-checklist (prompt choices)
+  "Prompt with PROMPT to choose one or more from the list of CHOICES."
+  (switch-to-buffer (generate-new-buffer-name "checklist"))
+  (let ((inhibit-read-only t))
+    (special-mode)
+    (setq buffer-read-only t)
+    (setq cursor-type 'box)
+    (insert (concat prompt "\n\n"))
+    (use-local-map (copy-keymap special-mode-map))
+    (local-set-key "n" 'next-line)
+    (local-set-key "p" 'previous-line)
+    (local-set-key (kbd "RET") 'checklist-checklist-choose)
+    (local-set-key (kbd "SPC") 'checklist-checklist-choose)
+    (local-set-key (kbd "C-c C-c") 'checklist-checklist-done)
+    (save-excursion
+      (cl-loop for choice in choices
+               do (insert (propertize (concat "[ ] " (cdr choice) "\n")
+                                      'checklist-check-item (car choice))))
+      (insert "\n")
+      (insert "Hit " (propertize "C-c C-c" 'face 'bold) " to finish."))
+    (add-hook 'post-command-hook #'checklist-highlight-section t t)
+    (setq checklist-read-checklist-result nil)
+    (recursive-edit)
+    (let ((result  checklist-read-checklist-result)
+          (kill-buffer-query-functions nil))
+      (kill-buffer (current-buffer))
+      result)))
+
+(defun checklist-checklist-done ()
+  "Done with the checklist, return the result."
+  (interactive)
+  (throw 'exit nil))
+
+(defun checklist-highlight-section ()
+  "Highlight the item at point."
+  (remove-overlays)
+  (when (get-text-property (point) 'checklist-check-item)
+    (let ((o (make-overlay (line-beginning-position)
+                           (1+ (line-end-position)))))
+      (overlay-put o 'face 'secondary-selection))))
+
+(defun checklist-checklist-choose ()
+  "Choose the current item at point."
+  (interactive)
+  (let ((inhibit-read-only t)
+        (checked (get-text-property (point) 'checklist-item-checked)))
+    (when (get-text-property (point) 'checklist-check-item)
+      (if checked
+          (setq checklist-read-checklist-result
+                (delete (get-text-property (point) 'checklist-check-item)
+                        checklist-read-checklist-result))
+          (add-to-list 'checklist-read-checklist-result
+                       (get-text-property (point) 'checklist-check-item)
+                       t))
+      (save-excursion (goto-char (line-beginning-position))
+                      (delete-region (line-beginning-position)
+                                     (+ (line-beginning-position) (length "[ ]")))
+                      (if checked
+                          (insert "[ ]")
+                        (insert "[x]")))
+      (put-text-property (line-beginning-position)
+                         (1+ (line-end-position))
+                         'checklist-item-checked (not checked))
+      (put-text-property (line-beginning-position)
+                         (1+ (line-end-position))
+                         'face (if checked nil 'bold))
+      (put-text-property (line-beginning-position)
+                         (1+ (line-end-position))
+                         'checklist-check-item t)
+      (checklist-highlight-section))))
+
+(provide 'checklist)