Rewrite the handling of HTML preamble/postamble.

* org-html.el (org-export-html-auto-preamble)
(org-export-html-auto-postamble): Remove.
(org-export-html-preamble, org-export-html-postamble): Turn
into custom variables.  Update the docstrings.
(org-export-html-preamble-format)
(org-export-html-postamble-format): New custom variables.
(org-export-as-html): Use org-export-html-postamble-format and
org-export-html-preamble-format.
(org-export-html-title-format): delete.

* org-exp.el (org-export-plist-vars): Remove
:auto-preamble and :auto-postamble.  Rename :preamble and
:postamble to :html-preamble and :html-postamble.

* org-publish.el (org-publish-project-alist): Remove
:auto-preamble and :auto-postamble.  Rename :preamble and
:postamble to :html-preamble and :html-postamble.

* org.texi (Publishing options): replace :preamble and
:auto-preamble by :html-preamble (same for postamble.)

doc/org.texi

@@ -10839,8 +10839,6 @@ respective variable for details.
 @vindex org-export-publishing-directory
 @vindex org-export-html-preamble
 @vindex org-export-html-postamble
-@vindex org-export-html-auto-preamble
-@vindex org-export-html-auto-postamble
 @vindex user-full-name
 @vindex user-mail-address
 @vindex org-export-select-tags
@@ -10888,10 +10886,8 @@ respective variable for details.
 @item @code{:expand-quoted-html}    @tab @code{org-export-html-expand}
 @item @code{:timestamp}             @tab @code{org-export-html-with-timestamp}
 @item @code{:publishing-directory}  @tab @code{org-export-publishing-directory}
-@item @code{:preamble}              @tab @code{org-export-html-preamble}
-@item @code{:postamble}             @tab @code{org-export-html-postamble}
-@item @code{:auto-preamble}         @tab @code{org-export-html-auto-preamble}
-@item @code{:auto-postamble}        @tab @code{org-export-html-auto-postamble}
+@item @code{:html-preamble}         @tab @code{org-export-html-preamble}
+@item @code{:html-postamble}        @tab @code{org-export-html-postamble}
 @item @code{:author}                @tab @code{user-full-name}
 @item @code{:email}                 @tab @code{user-mail-address} : @code{addr;addr;..}
 @item @code{:select-tags}           @tab @code{org-export-select-tags}
@@ -11103,8 +11099,7 @@ right place on the web server, and publishing images to it.
           :table-of-contents nil
           :style "<link rel=\"stylesheet\"
                   href=\"../other/mystyle.css\" type=\"text/css\"/>"
-          :auto-preamble t
-          :auto-postamble nil)
+          :html-preamble t)
 
          ("images"
           :base-directory "~/images/"

lisp/org-exp.el

@@ -629,10 +629,8 @@ table.el tables."
     (:expand-quoted-html      "@"	  org-export-html-expand)
     (:timestamp		      nil	  org-export-html-with-timestamp)
     (:publishing-directory    nil	  org-export-publishing-directory)
-    (:preamble		      nil	  org-export-html-preamble)
-    (:postamble		      nil	  org-export-html-postamble)
-    (:auto-preamble	      nil	  org-export-html-auto-preamble)
-    (:auto-postamble	      nil	  org-export-html-auto-postamble)
+    (:html-preamble	      nil	  org-export-html-preamble)
+    (:html-postamble	      nil	  org-export-html-postamble)
     (:author		      nil	  user-full-name)
     (:email		      nil	  user-mail-address)
     (:select-tags	      nil	  org-export-select-tags)

lisp/org-html.el

@@ -29,6 +29,7 @@
 ;;; Code:
 
 (require 'org-exp)
+(require 'format-spec)
 
 (eval-when-compile (require 'cl))
 
@@ -342,8 +343,41 @@ CSS classes, then this prefix can be very useful."
   :group 'org-export-html
   :type 'string)
 
-(defcustom org-export-html-title-format "<h1 class=\"title\">%s</h1>\n"
-  "Format for typesetting the document title in HTML export."
+(defcustom org-export-html-preamble t
+  "Non-nil means insert a preamble in HTML export.
+The format of the preamble is set as `org-export-html-preamble-format'.
+Setting :html-preamble in publishing projects will override this."
+  :group 'org-export-html
+  :type 'boolean)
+
+(defcustom org-export-html-preamble-format
+  '(("en" "<h1 class=\"title\">%t</h1>"))
+  "The format for the HTML preamble.
+
+%t stands for the title."
+  :group 'org-export-html
+  :type 'string)
+
+(defcustom org-export-html-postamble t
+  "Non-nil means insert a postamble in HTML export.
+The format of the postamble is set as `org-export-html-postamble-format'.
+Setting :html-postamble in publishing projects will override this."
+  :group 'org-export-html
+  :type 'boolean)
+
+(defcustom org-export-html-postamble-format
+  '(("en" "<p class=\"author\">Author: %a (%e)</p>
+<p class=\"date\">Date: %d</p>
+<p class=\"creator\">Generated by %c</p>
+<p class=\"xhtml-validation\">%v</p>
+"))
+  "The format for the HTML postamble.
+
+%a stands for the author.
+%e stands for the email(s).
+%d stands for the date.
+%c will be replaced by information about Org/Emacs.
+%v will be replaced by `org-export-html-validation-link'."
   :group 'org-export-html
   :type 'string)
 
@@ -469,13 +503,11 @@ When nil, also column one will use data tags."
   :group 'org-export-tables
   :type 'boolean)
 
-(defcustom org-export-html-validation-link nil
-  "Non-nil means add validation link to postamble of HTML exported files."
+(defcustom org-export-html-validation-link
+  "<a href=\"http://validator.w3.org/check?uri=referer\">Validate XHTML 1.0</a>"
+  "Link to HTML validation service."
   :group 'org-export-html
-  :type '(choice
-	  (const :tag "Nothing" nil)
-	  (const :tag "XHTML 1.0" "<p class=\"xhtml-validation\"><a href=\"http://validator.w3.org/check?uri=referer\">Validate XHTML 1.0</a></p>")
-	  (string :tag "Specify full HTML")))
+  :type 'string)
 
 (defcustom org-export-html-with-timestamp nil
   "If non-nil, write timestamp into the exported HTML text.
@@ -534,19 +566,6 @@ with a link to this URL."
 	  (const :tag "Keep internal css" nil)
 	  (string :tag "URL or local href")))
 
-;;; Variables, constants, and parameter plists
-
-(defvar org-export-html-preamble nil
-  "Preamble, to be inserted just after <body>.  Set by publishing functions.
-This may also be a function, building and inserting the preamble.")
-(defvar org-export-html-postamble nil
-  "Postamble, to be inserted just before </body>.  Set by publishing functions.
-This may also be a function, building and inserting the postamble.")
-(defvar org-export-html-auto-preamble t
-  "Should default preamble be inserted?  Set by publishing functions.")
-(defvar org-export-html-auto-postamble t
-  "Should default postamble be inserted?  Set by publishing functions.")
-
 ;;; Hooks
 
 (defvar org-export-html-after-blockquotes-hook nil
@@ -1241,11 +1260,18 @@ lang=\"%s\" xml:lang=\"%s\">
 		      "\n")
 		   "")))
 
-        (org-export-html-insert-plist-item opt-plist :preamble opt-plist)
-
-	(when (plist-get opt-plist :auto-preamble)
-	  (if title (insert (format org-export-html-title-format
-				    (org-html-expand title))))))
+	;; insert html preamble (for now the title)
+	(when (plist-get opt-plist :html-preamble)
+	  (let* ((html-preamble (plist-get opt-plist :html-preamble))
+		 (html-preamble-format
+		  (if (stringp html-preamble)
+		      html-preamble
+		    (or (cadr (assoc (nth 0 lang-words)
+				     org-export-html-preamble-format))
+			(cadr (assoc "en" org-export-html-preamble-format))))))
+	    (insert (format-spec html-preamble-format
+				 `((?t . ,(org-html-expand title))
+				   (?a . ,author) (?d . ,date) (?e . ,email)))))))
 
       (if (and org-export-with-toc (not body-only))
 	  (progn
@@ -1698,36 +1724,37 @@ lang=\"%s\" xml:lang=\"%s\">
       (let ((bib (org-export-html-get-bibliography)))
 	(when bib
 	  (insert "\n" bib "\n")))
+
+      ;; export html postamble
       (unless body-only
-	(when (plist-get opt-plist :auto-postamble)
-	  (insert "<div id=\"postamble\">\n")
-	  (when (and org-export-author-info author)
-	    (insert "<p class=\"author\"> "
-		    (nth 1 lang-words) ": " author "\n")
-	    (when (and org-export-email-info email (string-match "\\S-" email))
-	      (if (listp (split-string email ",+ *"))
-		  (mapc (lambda(e)
-			  (insert "<a href=\"mailto:" e "\">&lt;"
-				  e "&gt;</a>\n"))
-			(split-string email ",+ *"))
-		(insert "<a href=\"mailto:" email "\">&lt;"
-			email "&gt;</a>\n")))
-	    (insert "</p>\n"))
-	  (when (and date org-export-time-stamp-file)
-	    (insert "<p class=\"date\"> "
-		    (nth 2 lang-words) ": "
-		    date "</p>\n"))
-	  (when org-export-creator-info
-	    (insert (format "<p class=\"creator\">HTML generated by org-mode %s in emacs %s</p>\n"
-			    org-version emacs-major-version)))
-	  (when org-export-html-validation-link
-	    (insert org-export-html-validation-link "\n"))
-	  (insert "</div>"))
-
-	(if org-export-html-with-timestamp
-	    (insert org-export-html-html-helper-timestamp))
-        (org-export-html-insert-plist-item opt-plist :postamble opt-plist)
-	(insert "\n</div>\n</body>\n</html>\n"))
+	(when (plist-get opt-plist :html-postamble)
+	  (let* ((html-postamble (plist-get opt-plist :html-postamble))
+		 (html-postamble-format
+		  (if (stringp html-postamble)
+		      html-postamble
+		    (or (cadr (assoc (nth 0 lang-words)
+				     org-export-html-postamble-format))
+			(cadr (assoc "en" org-export-html-postamble-format)))))
+		 (email
+		  (mapconcat (lambda(e)
+			       (format "<a href=\"mailto:%s\">%s</a>" e e))
+			     (split-string email ",+ *")
+			     ", "))
+		 (creator-info
+		  (concat "Org version " org-version " with Emacs version "
+			  (number-to-string emacs-major-version))))
+	    (insert "<div id=\"postamble\">\n")
+	    (insert (format-spec html-postamble-format
+				 `((?a . ,author) (?e . ,email)
+				   (?d . ,date)   (?c . ,creator-info)
+				   (?v . ,org-export-html-validation-link))))
+	    (insert "</div>")
+	    )))
+
+      (if org-export-html-with-timestamp
+	  (insert org-export-html-html-helper-timestamp))
+
+      (insert "\n</div>\n</body>\n</html>\n")
 
       (unless (plist-get opt-plist :buffer-will-be-killed)
 	(normal-mode)

lisp/org-publish.el

@@ -155,10 +155,8 @@ learn more about their use and default values.
   :expand-quoted-html    `org-export-html-expand'
   :timestamp             `org-export-html-with-timestamp'
   :publishing-directory  `org-export-publishing-directory'
-  :preamble              `org-export-html-preamble'
-  :postamble             `org-export-html-postamble'
-  :auto-preamble         `org-export-html-auto-preamble'
-  :auto-postamble        `org-export-html-auto-postamble'
+  :html-preamble         `org-export-html-preamble'
+  :html-postamble        `org-export-html-postamble'
   :author                `user-full-name'
   :email                 `user-mail-address'