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;;; gnus-eform.el --- a mode for editing forms for Gnus -*- lexical-binding: t; -*-
;; Copyright (C) 1996-2021 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 <https://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."
:type 'hook)
(defcustom gnus-edit-form-menu-hook nil
"Hook run when creating menus in `gnus-edit-form-mode' buffers."
: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
(let ((map (make-sparse-keymap)))
(set-keymap-parent map emacs-lisp-mode-map)
(gnus-define-keys map
"\C-c\C-c" gnus-edit-form-done
"\C-c\C-k" gnus-edit-form-exit)
map))
(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 lisp-data-mode "Edit Form"
"Major mode for editing forms.
It is a slightly enhanced `lisp-data-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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