+ ;; Put the "From:" field in unless for some odd reason
+ ;; they put one in themselves.
+ (goto-char (point-min))
+ (if (not (re-search-forward "^From:" delimline t))
+ (let* ((login user-mail-address)
+ (fullname (user-full-name)))
+ (cond ((eq mail-from-style 'angles)
+ (insert "From: " fullname)
+ (let ((fullname-start (+ (point-min) 6))
+ (fullname-end (point-marker)))
+ (goto-char fullname-start)
+ ;; Look for a character that cannot appear unquoted
+ ;; according to RFC 822.
+ (if (re-search-forward "[^- !#-'*+/-9=?A-Z^-~]"
+ fullname-end 1)
+ (progn
+ ;; Quote fullname, escaping specials.
+ (goto-char fullname-start)
+ (insert "\"")
+ (while (re-search-forward "[\"\\]"
+ fullname-end 1)
+ (replace-match "\\\\\\&" t))
+ (insert "\""))))
+ (insert " <" login ">\n"))
+ ((eq mail-from-style 'parens)
+ (insert "From: " login " (")
+ (let ((fullname-start (point)))
+ (insert fullname)
+ (let ((fullname-end (point-marker)))
+ (goto-char fullname-start)
+ ;; RFC 822 says \ and nonmatching parentheses
+ ;; must be escaped in comments.
+ ;; Escape every instance of ()\ ...
+ (while (re-search-forward "[()\\]" fullname-end 1)
+ (replace-match "\\\\\\&" t))
+ ;; ... then undo escaping of matching parentheses,
+ ;; including matching nested parentheses.
+ (goto-char fullname-start)
+ (while (re-search-forward
+ "\\(\\=\\|[^\\]\\(\\\\\\\\\\)*\\)\\\\(\\(\\([^\\]\\|\\\\\\\\\\)*\\)\\\\)"
+ fullname-end 1)
+ (replace-match "\\1(\\3)" t)
+ (goto-char fullname-start))))
+ (insert ")\n"))
+ ((null mail-from-style)
+ (insert "From: " login "\n")))))