code.delx.au - gnu-emacs/blob - lisp/gnus/gnus-eform.el

   1 ;;; gnus-eform.el --- a mode for editing forms for Gnus
   2
   3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   7 ;; Keywords: news
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 (require 'gnus)
  29 (require 'gnus-win)
  30
  31 ;;;
  32 ;;; Editing forms
  33 ;;;
  34
  35 (defgroup gnus-edit-form nil
  36   "A mode for editing forms."
  37   :group 'gnus)
  38
  39 (defcustom gnus-edit-form-mode-hook nil
  40   "Hook run in `gnus-edit-form-mode' buffers."
  41   :group 'gnus-edit-form
  42   :type 'hook)
  43
  44 (defcustom gnus-edit-form-menu-hook nil
  45   "Hook run when creating menus in `gnus-edit-form-mode' buffers."
  46   :group 'gnus-edit-form
  47   :type 'hook)
  48
  49 ;;; Internal variables
  50
  51 (defvar gnus-edit-form-buffer "*Gnus edit form*")
  52 (defvar gnus-edit-form-done-function nil)
  53
  54 (defvar gnus-edit-form-mode-map nil)
  55 (unless gnus-edit-form-mode-map
  56   (setq gnus-edit-form-mode-map (make-sparse-keymap))
  57   (set-keymap-parent gnus-edit-form-mode-map emacs-lisp-mode-map)
  58   (gnus-define-keys gnus-edit-form-mode-map
  59     "\C-c\C-c" gnus-edit-form-done
  60     "\C-c\C-k" gnus-edit-form-exit))
  61
  62 (defun gnus-edit-form-make-menu-bar ()
  63   (unless (boundp 'gnus-edit-form-menu)
  64     (easy-menu-define
  65      gnus-edit-form-menu gnus-edit-form-mode-map ""
  66      '("Edit Form"
  67        ["Exit and save changes" gnus-edit-form-done t]
  68        ["Exit" gnus-edit-form-exit t]))
  69     (gnus-run-hooks 'gnus-edit-form-menu-hook)))
  70
  71 (defun gnus-edit-form-mode ()
  72   "Major mode for editing forms.
  73 It is a slightly enhanced emacs-lisp-mode.
  74
  75 \\{gnus-edit-form-mode-map}"
  76   (interactive)
  77   (when (gnus-visual-p 'group-menu 'menu)
  78     (gnus-edit-form-make-menu-bar))
  79   (kill-all-local-variables)
  80   (setq major-mode 'gnus-edit-form-mode)
  81   (setq mode-name "Edit Form")
  82   (use-local-map gnus-edit-form-mode-map)
  83   (make-local-variable 'gnus-edit-form-done-function)
  84   (make-local-variable 'gnus-prev-winconf)
  85   (gnus-run-mode-hooks 'gnus-edit-form-mode-hook))
  86
  87 (defun gnus-edit-form (form documentation exit-func &optional layout)
  88   "Edit FORM in a new buffer.
  89 Call EXIT-FUNC on exit.  Display DOCUMENTATION in the beginning
  90 of the buffer.
  91 The optional LAYOUT overrides the `edit-form' window layout."
  92   (let ((winconf (current-window-configuration)))
  93     (set-buffer (gnus-get-buffer-create gnus-edit-form-buffer))
  94     (gnus-configure-windows (or layout 'edit-form))
  95     (gnus-edit-form-mode)
  96     (setq gnus-prev-winconf winconf)
  97     (setq gnus-edit-form-done-function exit-func)
  98     (erase-buffer)
  99     (insert documentation)
 100     (unless (bolp)
 101       (insert "\n"))
 102     (goto-char (point-min))
 103     (while (not (eobp))
 104       (insert ";;; ")
 105       (forward-line 1))
 106     (insert ";; Type `C-c C-c' after you've finished editing.\n")
 107     (insert "\n")
 108     (let ((p (point)))
 109       (gnus-pp form)
 110       (insert "\n")
 111       (goto-char p))))
 112
 113 (defun gnus-edit-form-done ()
 114   "Update changes and kill the current buffer."
 115   (interactive)
 116   (goto-char (point-min))
 117   (let ((form (condition-case nil
 118                   (read (current-buffer))
 119                 (end-of-file nil)))
 120         (func gnus-edit-form-done-function))
 121     (gnus-edit-form-exit)
 122     (funcall func form)))
 123
 124 (defun gnus-edit-form-exit ()
 125   "Kill the current buffer."
 126   (interactive)
 127   (let ((winconf gnus-prev-winconf))
 128     (kill-buffer (current-buffer))
 129     (set-window-configuration winconf)))
 130
 131 (provide 'gnus-eform)
 132
 133 ;;; gnus-eform.el ends here