door-gnus.el

;;; door-gnus.el --- Hack to enter, bury, unbury gnus.

;; Copyright (C) 2013 Yagnesh Raghava Yakkala <http://yagnesh.org>

;; Author: Yagnesh Raghava Yakkala <hi@yagnesh.org>
;; URL: https://github.com/yyr/door-gnus
;; Maintainer: Yagnesh Raghava Yakkala <hi@yagnesh.org>
;; Version: 0.1
;; Created: Friday, February 15 2013
;; Keywords: gnus, hack

;; This file is NOT part of GNU Emacs.

;; door-gnus 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.

;; door-gnus.el 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 file.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:
;; Enhanced version from http://www.emacswiki.org/emacs/SwitchToGnus

;;; Code:
(require 'regexp-opt)

;;;###autoload
(defcustom door-gnus-key (kbd "<f9>g")
  "Key binding for `door-gnus' command")

(defvar door-gnus-buffer-list
  '("*Group*" "*BBDB*" "*Summary" "*mail" "*wide" "*Article" "*reply")
  "List of possible gnus buffers (desired ones at least).")

(defvar door-gnus-buffer-list-re (regexp-opt door-gnus-buffer-list))

(defvar door-gnus-bury-window-configuration nil
  "Window configuration which will be restored when burying gnus.")

(defvar door-gnus-unbury-window-configuration nil
  "Window configuration which will be restored when unburying gnus.")

;;;###autoload
(defun door-gnus (&optional arg)
  "Switch between gnus and non-gnus buffers, preserving window configurations."
  (interactive "P")
  (if (file-exists-p gnus-startup-file)
      (if (and  arg (eq major-mode 'gnus-group-mode))
          (gnus-group-exit)
        (let ((bufname (buffer-name)))
          (if (string-match door-gnus-buffer-list-re bufname)
              (door-gnus-bury)
            (if (get-buffer "*Group*")
                (door-gnus-unbury)
              (progn
                (setq door-gnus-bury-window-configuration
                      (current-window-configuration))
                (delete-other-windows)
                (gnus))))))
    (message "%s" (propertize
                   "No startup file exits, call directly gnus"
                   'face '(:background "#663333" :foreground "#ddbbbb")))))

(defun door-gnus-unbury ()
  "Bring gnus (unbury) on top.
Restore if there is saved window configuration
`door-gnus-unbury-window-configuration' for gnus."
  (setq door-gnus-bury-window-configuration (current-window-configuration))
  (let ((bufs nil)
        (bufname nil))
    (dolist (bufs (buffer-list))
      (setq bufname (buffer-name bufs))
      (unless (string-match door-gnus-buffer-list-re bufname)
        (bury-buffer bufname)))
    (if door-gnus-unbury-window-configuration
        (progn
          (set-window-configuration door-gnus-unbury-window-configuration)
          (setq door-gnus-unbury-window-configuration nil))
      (delete-other-windows)
      (switch-to-buffer "*Group*" nil t))))

(defun door-gnus-bury ()
  "Send gnus (bury) on to back.
Restore if there is saved window configuration
`door-gnus-bury-window-configuration' for gnus."
  (setq door-gnus-unbury-window-configuration (current-window-configuration))
  (let ((bufs nil)
        (bufname nil))
    (dolist (bufs (buffer-list))
      (setq bufname (buffer-name bufs))
      (when (string-match door-gnus-buffer-list-re bufname)
        (bury-buffer bufname)))
    (if door-gnus-bury-window-configuration
        (progn
          (set-window-configuration door-gnus-bury-window-configuration)
          (setq door-gnus-bury-window-configuration nil)))))

;;;###autoload
(global-set-key door-gnus-key 'door-gnus)

;;;###autoload
(eval-after-load "gnus"
  '(define-key gnus-group-mode-map (kbd "q") 'door-gnus))

(provide 'door-gnus)
;;; door-gnus.el ends here