dot/gnus.el: Configure Gnus's (and Message's) use of crypto.

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;;; -*- mode: emacs-lisp; coding: utf-8 -*-
;;;
;;; GNUS configuration
;;;
;;; (c) 2009 Mark Wooding
;;;

;;;----- Licensing notice ---------------------------------------------------
;;;
;;; This program 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 of the License, or
;;; (at your option) any later version.
;;;
;;; This program 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 program; if not, write to the Free Software
;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

;;;--------------------------------------------------------------------------
;;; General Gnus preferences.

;; Divide the main groups list by topics.
(add-hook 'gnus-group-mode-hook 'gnus-topic-mode)
(setq gnus-subscribe-newsgroup-method 'gnus-subscribe-topics)

;; Use hacky movemail program to move mail.
(setq mail-source-movemail-program "~/bin/movemail-hack")

;; Don't force use of a full window.
(setq gnus-use-full-window nil)

;; Display a slrn-like tree view in the summary window.
(setq gnus-use-trees nil)
(setq gnus-summary-line-format "%U%R%z%4L %(%[%-16,16f%]%): %B %s\n")
(setq gnus-sum-thread-tree-root ">"
      gnus-sum-thread-tree-false-root ">"
      gnus-sum-thread-tree-single-indent "="
      gnus-sum-thread-tree-indent "  ")
(if (memq (coding-system-get (terminal-coding-system) 'mime-charset)
	  '(nil utf-8))
    (setq gnus-sum-thread-tree-leaf-with-other "├─>"
	  gnus-sum-thread-tree-vertical        "│ "
	  gnus-sum-thread-tree-single-leaf     "╰─>")
  (setq gnus-sum-thread-tree-leaf-with-other   "|->"
	gnus-sum-thread-tree-vertical          "| "
	gnus-sum-thread-tree-single-leaf       "`->"))

;; Sort threads in a useful way.
(setq gnus-thread-sort-functions
      '(gnus-thread-sort-by-number
	gnus-thread-sort-by-subject
	gnus-thread-sort-by-total-score))

;; Configure the crypto.
(setq mm-verify-option 'known
      mm-sign-option 'guided
      mm-decrypt-option 'never)

;; Use one article buffer per group.
(setq gnus-single-article-buffer nil)

;; Don't expand threads on initial opening.
(setq gnus-thread-hide-subtree t)

;; Don't use strange icons instead of traditional smileys.
(setq gnus-treat-display-smileys nil)

;; Fairly large numbers of articles are OK; don't bother warning me.
(setq gnus-large-newsgroup 500)

;; When splitting articles, crossposting is a reasonable thing to do.
(setq nnimap-split-crosspost t)

;; We may have the misfortune to talk to an Exchange server.
(setq imap-enable-exchange-bug-workaround t)

;; Save articles in mbox format by default, of course, and save an entire
;; batch with the same name.
(setq gnus-prompt-before-saving t
      gnus-default-article-saver 'gnus-summary-save-in-mail)

;; Clean up properly when closing the summary.
(defadvice gnus-summary-exit (before mdw-kill-debris compile activate)
  (gnus-summary-expand-window))

;; Configure article display a bit.
(defun mdw-gnus-article-setup ()
  (setq truncate-lines nil
	truncate-partial-width-windows nil
	word-wrap t
	wrap-prefix (concat (propertize "..." 'face 'mdw-ellipsis-face)
			    " ")))
(add-hook 'gnus-article-mode-hook #'mdw-gnus-article-setup)

;;;--------------------------------------------------------------------------
;;; Local configuration.

;; Fetching news from the local news server seems sensible.
(setq gnus-select-method
      (let ((server (mdw-config 'nntp-server)))
	(if server
	    `(nntp ,server)
	  '(nnnil ""))))

;; Now load a local configuration file.
(load "~/.gnus-local.el")

;;;----- That's all, folks --------------------------------------------------