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+;;; gnus-eform.el --- a mode for editing forms for Gnus
+;; Copyright (C) 1996,97 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; 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 2, 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; 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-done-function nil)
+(defvar gnus-edit-form-buffer "*Gnus edit form*")
+
+(defvar gnus-edit-form-mode-map nil)
+(unless gnus-edit-form-mode-map
+  (setq gnus-edit-form-mode-map (copy-keymap 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]))
+    (run-hooks 'gnus-edit-form-menu-hook)))
+
+(defun gnus-edit-form-mode ()
+  "Major mode for editing forms.
+It is a slightly enhanced emacs-lisp-mode.
+
+\\{gnus-edit-form-mode-map}"
+  (interactive)
+  (when (gnus-visual-p 'group-menu 'menu)
+    (gnus-edit-form-make-menu-bar))
+  (kill-all-local-variables)
+  (setq major-mode 'gnus-edit-form-mode)
+  (setq mode-name "Edit Form")
+  (use-local-map gnus-edit-form-mode-map)
+  (make-local-variable 'gnus-edit-form-done-function)
+  (make-local-variable 'gnus-prev-winconf)
+  (run-hooks 'gnus-edit-form-mode-hook))
+
+(defun gnus-edit-form (form documentation exit-func)
+  "Edit FORM in a new buffer.
+Call EXIT-FUNC on exit.  Display DOCUMENTATION in the beginning
+of the buffer."
+  (let ((winconf (current-window-configuration)))
+    (set-buffer (get-buffer-create gnus-edit-form-buffer))
+    (gnus-configure-windows 'edit-form)
+    (gnus-add-current-to-buffer-list)
+    (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 ";; Type `C-c C-c' after you've finished editing.\n")
+    (insert "\n")
+    (let ((p (point)))
+      (pp form (current-buffer))
+      (insert "\n")
+      (goto-char p))))
+
+(defun gnus-edit-form-done ()
+  "Update changes and kill the current buffer."
+  (interactive)
+  (goto-char (point-min))
+  (let ((form (read (current-buffer)))
+	(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