--- /dev/null
+;;; gnus-eform.el --- a mode for editing forms for Gnus
+
+;; Copyright (C) 1996-2016 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
+;; Keywords: news
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'gnus)
+(require 'gnus-win)
+
+;;;
+;;; Editing forms
+;;;
+
+(defgroup gnus-edit-form nil
+ "A mode for editing forms."
+ :group 'gnus)
+
+(defcustom gnus-edit-form-mode-hook nil
+ "Hook run in `gnus-edit-form-mode' buffers."
+ :group 'gnus-edit-form
+ :type 'hook)
+
+(defcustom gnus-edit-form-menu-hook nil
+ "Hook run when creating menus in `gnus-edit-form-mode' buffers."
+ :group 'gnus-edit-form
+ :type 'hook)
+
+;;; Internal variables
+
+(defvar gnus-edit-form-buffer "*Gnus edit form*")
+(defvar gnus-edit-form-done-function nil)
+
+(defvar gnus-edit-form-mode-map nil)
+(unless gnus-edit-form-mode-map
+ (setq gnus-edit-form-mode-map (make-sparse-keymap))
+ (set-keymap-parent gnus-edit-form-mode-map emacs-lisp-mode-map)
+ (gnus-define-keys gnus-edit-form-mode-map
+ "\C-c\C-c" gnus-edit-form-done
+ "\C-c\C-k" gnus-edit-form-exit))
+
+(defun gnus-edit-form-make-menu-bar ()
+ (unless (boundp 'gnus-edit-form-menu)
+ (easy-menu-define
+ gnus-edit-form-menu gnus-edit-form-mode-map ""
+ '("Edit Form"
+ ["Exit and save changes" gnus-edit-form-done t]
+ ["Exit" gnus-edit-form-exit t]))
+ (gnus-run-hooks 'gnus-edit-form-menu-hook)))
+
+(define-derived-mode gnus-edit-form-mode fundamental-mode "Edit Form"
+ "Major mode for editing forms.
+It is a slightly enhanced emacs-lisp-mode.
+
+\\{gnus-edit-form-mode-map}"
+ (when (gnus-visual-p 'group-menu 'menu)
+ (gnus-edit-form-make-menu-bar))
+ (make-local-variable 'gnus-edit-form-done-function)
+ (make-local-variable 'gnus-prev-winconf))
+
+(defun gnus-edit-form (form documentation exit-func &optional layout)
+ "Edit FORM in a new buffer.
+Call EXIT-FUNC on exit. Display DOCUMENTATION in the beginning
+of the buffer.
+The optional LAYOUT overrides the `edit-form' window layout."
+ (let ((winconf (current-window-configuration)))
+ (set-buffer (gnus-get-buffer-create gnus-edit-form-buffer))
+ (gnus-configure-windows (or layout 'edit-form))
+ (gnus-edit-form-mode)
+ (setq gnus-prev-winconf winconf)
+ (setq gnus-edit-form-done-function exit-func)
+ (erase-buffer)
+ (insert documentation)
+ (unless (bolp)
+ (insert "\n"))
+ (goto-char (point-min))
+ (while (not (eobp))
+ (insert ";;; ")
+ (forward-line 1))
+ (insert (substitute-command-keys
+ ";; Type `C-c C-c' after you've finished editing.\n"))
+ (insert "\n")
+ (let ((p (point)))
+ (gnus-pp form)
+ (insert "\n")
+ (goto-char p))))
+
+(defun gnus-edit-form-done ()
+ "Update changes and kill the current buffer."
+ (interactive)
+ (goto-char (point-min))
+ (let ((form (condition-case nil
+ (read (current-buffer))
+ (end-of-file nil)))
+ (func gnus-edit-form-done-function))
+ (gnus-edit-form-exit)
+ (funcall func form)))
+
+(defun gnus-edit-form-exit ()
+ "Kill the current buffer."
+ (interactive)
+ (let ((winconf gnus-prev-winconf))
+ (kill-buffer (current-buffer))
+ (set-window-configuration winconf)))
+
+(provide 'gnus-eform)
+
+;;; gnus-eform.el ends here
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