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comparison lisp/hyperbole/hsmail.el @ 0:376386a54a3c r19-14

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date Mon, 13 Aug 2007 08:45:50 +0200
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1 ;;!emacs
2 ;;
3 ;; FILE: hsmail.el
4 ;; SUMMARY: Support for Hyperbole buttons in mail composer: mail and mh-letter.
5 ;; USAGE: GNU Emacs Lisp Library
6 ;; KEYWORDS: hypermedia, mail
7 ;;
8 ;; AUTHOR: Bob Weiner
9 ;; ORG: Brown U.
10 ;;
11 ;; ORIG-DATE: 9-May-91 at 04:50:20
12 ;; LAST-MOD: 8-Aug-95 at 10:55:17 by Bob Weiner
13 ;;
14 ;; This file is part of Hyperbole.
15 ;; Available for use and distribution under the same terms as GNU Emacs.
16 ;;
17 ;; Copyright (C) 1991-1995, Free Software Foundation, Inc.
18 ;; Developed with support from Motorola Inc.
19 ;;
20 ;; DESCRIPTION:
21 ;; DESCRIP-END.
22
23 ;;; ************************************************************************
24 ;;; Other required Elisp libraries
25 ;;; ************************************************************************
26
27 (require 'sendmail)
28
29 ;;; ************************************************************************
30 ;;; Public variables
31 ;;; ************************************************************************
32
33
34 (defvar smail:comment '(format
35 "Comments: Hyperbole mail buttons accepted, v%s.\n"
36 hyperb:version)
37 "Default comment form to evaluate and add to outgoing mail.
38 Set to the empty string, \"\", for no comment.")
39
40 ;;; Used by 'mail-send' in Emacs "sendmail.el".
41 (if (boundp 'send-mail-function)
42 (or (if (listp send-mail-function)
43 (if (equal (nth 2 send-mail-function) '(smail:widen))
44 nil
45 (error
46 "(hsmail): Set 'send-mail-function' to a symbol-name, not a list, before load.")))
47 (setq send-mail-function
48 (list 'lambda nil '(smail:widen) (list send-mail-function))))
49 (error "(hsmail): Install an Emacs \"sendmail.el\" which includes 'send-mail-function'."))
50
51 (if (fboundp 'mail-prefix-region)
52 ;;
53 ;; For compatibility with rsw-modified sendmail.el.
54 (defvar mail-yank-hook
55 (function
56 (lambda ()
57 ;; Set off original message.
58 (mail-prefix-region (hypb:mark t) (point))))
59 "*Hook to run mail yank preface function.
60 Expects point and mark to be set to the region to preface.")
61 ;;
62 ;; Else for compatibility with Supercite and Emacs V19.
63 ;; If you create your own yank hook, set this variable rather than
64 ;; 'mail-yank-hook' from above.
65 (defvar mail-citation-hook nil
66 "*Hook for modifying a citation just inserted in the mail buffer.
67 Each hook function can find the citation between (point) and (mark t).
68 And each hook function should leave point and mark around the citation
69 text as modified.
70
71 If this hook is entirely empty (nil), a default action is taken
72 instead of no action.")
73 (defvar mail-yank-hooks '(mail-indent-citation)
74 "*Obsolete hook to run mail yank citation function. Use mail-citation-hook instead.
75 Expects point and mark to be set to the region to cite."))
76
77 ;; For compatibility with Supercite and Emacs V19.
78 (defvar mail-yank-prefix nil
79 "*Prefix insert on lines of yanked message being replied to.
80 nil means use indentation.")
81 (defvar mail-indentation-spaces 3
82 "*Number of spaces to insert at the beginning of each cited line.")
83
84 ;;; ************************************************************************
85 ;;; Public functions
86 ;;; ************************************************************************
87
88 (defun smail:comment-add (&optional comment-form)
89 "Adds a comment to the current outgoing message if Hyperbole has been loaded.
90 Optional COMMENT-FORM is evaluated to obtain the string to add to the
91 message. If not given, 'smail:comment' is evaluated by default."
92 (let ((comment (eval (or comment-form smail:comment))))
93 (if (and comment (featurep 'hsite))
94 (save-excursion
95 (goto-char (point-min))
96 (and (or (search-forward mail-header-separator nil t)
97 (if (eq major-mode 'mh-letter-mode)
98 (search-forward "\n--------" nil t)))
99 (not (search-backward comment nil t))
100 (progn (beginning-of-line) (insert comment)))))))
101
102 (defun smail:widen ()
103 "Widens outgoing mail buffer to include Hyperbole button data."
104 (if (fboundp 'mail+narrow) (mail+narrow) (widen)))
105
106 ;; Overlay this function from V19 "sendmail.el" to work with V18.
107 (defun mail-indent-citation ()
108 "Modify text just inserted from a message to be cited.
109 The inserted text should be the region.
110 When this function returns, the region is again around the modified text.
111
112 Normally, indent each nonblank line `mail-indentation-spaces' spaces.
113 However, if `mail-yank-prefix' is non-nil, insert that prefix on each line."
114 (let ((start (point)))
115 ;; Don't ever remove headers if user uses Supercite package,
116 ;; since he can set an option in that package to do
117 ;; the removal.
118 (or (hypb:supercite-p)
119 (mail-yank-clear-headers start (hypb:mark t)))
120 (if (null mail-yank-prefix)
121 (indent-rigidly start (hypb:mark t) mail-indentation-spaces)
122 (save-excursion
123 (goto-char start)
124 (while (< (point) (hypb:mark t))
125 (insert mail-yank-prefix)
126 (forward-line 1))))))
127
128 ;; Overlay this function from "sendmail.el" to include Hyperbole button
129 ;; data when yanking in a message and to highlight buttons if possible.
130 (defun mail-yank-original (arg)
131 "Insert the message being replied to, if any.
132 Puts point before the text and mark after.
133 Applies 'mail-citation-hook', 'mail-yank-hook' or 'mail-yank-hooks'
134 to text (in decreasing order of precedence).
135 Just \\[universal-argument] as argument means don't apply hooks
136 and don't delete any header fields.
137
138 If supercite is in use, header fields are never deleted.
139 Use (setq sc-nuke-mail-headers-p t) to have them removed."
140 (interactive "P")
141 (if mail-reply-buffer
142 (let ((start (point)) opoint)
143 (delete-windows-on mail-reply-buffer)
144 (unwind-protect
145 (progn
146 (save-excursion
147 (set-buffer mail-reply-buffer)
148 ;; Might be called from newsreader before any
149 ;; Hyperbole mail reader support has been autoloaded.
150 (cond ((fboundp 'rmail:msg-widen) (rmail:msg-widen))
151 ((eq major-mode 'news-reply-mode) (widen))))
152 (setq opoint (point))
153 (insert-buffer mail-reply-buffer)
154 (hmail:msg-narrow)
155 (if (fboundp 'hproperty:but-create) (hproperty:but-create))
156 (if (consp arg)
157 nil
158 ;; Don't ever remove headers if user uses Supercite package,
159 ;; since he can set an option in that package to do
160 ;; the removal.
161 (or (hypb:supercite-p)
162 (mail-yank-clear-headers
163 start (marker-position (hypb:mark-marker t))))
164 (let ((mail-indentation-spaces (if arg (prefix-numeric-value arg)
165 mail-indentation-spaces)))
166 (cond ((and (boundp 'mail-citation-hook) mail-citation-hook)
167 (run-hooks 'mail-citation-hook))
168 ((and (boundp 'mail-yank-hook) mail-yank-hook)
169 (run-hooks 'mail-yank-hook))
170 ((and (boundp 'mail-yank-hooks) mail-yank-hooks)
171 (run-hooks 'mail-yank-hooks))
172 (t (mail-indent-citation))))
173 (goto-char (min (point-max) (hypb:mark t)))
174 (set-mark opoint)
175 (delete-region (point) ; Remove trailing blank lines.
176 (progn (re-search-backward "[^ \^I\^L\n]")
177 (end-of-line)
178 (point))))
179 (or (eq major-mode 'news-reply-mode)
180 ;; This is like exchange-point-and-mark, but doesn't activate the mark.
181 ;; It is cleaner to avoid activation, even though the command
182 ;; loop would deactivate the mark because we inserted text.
183 (goto-char (prog1 (hypb:mark t)
184 (set-marker (hypb:mark-marker t)
185 (point) (current-buffer)))))
186 (if (not (eolp)) (insert ?\n))
187 )
188 (save-excursion
189 (set-buffer mail-reply-buffer)
190 (hmail:msg-narrow))))))
191
192 ;;; ************************************************************************
193 ;;; Private variables
194 ;;; ************************************************************************
195
196 ;;; Try to setup comment addition as the first element of these hooks.
197 (if (fboundp 'add-hook)
198 (progn
199 (add-hook 'mail-setup-hook 'smail:comment-add)
200 (add-hook 'mh-letter-mode-hook 'smail:comment-add))
201 (var:append 'mail-setup-hook '(smail:comment-add))
202 (var:append 'mh-letter-mode-hook '(smail:comment-add)))
203
204 (provide 'hsmail)