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+;;; rt-liberation-storage.el --- Storage backend for rt-liberation
+
+;; Copyright (C) 2010  Yoni Rabkin
+;;
+;; Author: Yoni Rabkin <yonirabkin@member.fsf.org>
+;;
+;; 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.
+
+;;; Code:
+
+(require 'rt-liberation)
+
+(defvar rt-liber-store nil
+  "In memory storage for ticket metadata.")
+
+(defvar rt-liber-store-file "ticket_metadata"
+  "File name for storing ticket metadata.")
+
+(defvar rt-liber-ancillary-format-f 'rt-liber-ancillary-format-f
+  "Default formatting function for ancillary data.")
+
+(defun rt-liber-store-write ()
+  "Write `rt-liber-store' to permanent storage."
+  (when (and (stringp rt-liber-directory)
+	     (not (file-exists-p rt-liber-directory)))
+    (make-directory rt-liber-directory))
+  (when (hash-table-p rt-liber-store)
+    (with-temp-buffer
+      (insert (format "%s" rt-liber-store))
+      (insert "\n")
+      (write-file
+       (concat (file-name-as-directory rt-liber-directory)
+	       rt-liber-store-file)))))
+
+(defun rt-liber-store-read ()
+  "Populate `rt-liber-store' from permanent storage."
+  (let ((file (concat (file-name-as-directory rt-liber-directory)
+		      rt-liber-store-file)))
+    (when (file-exists-p file)
+      (setq rt-liber-store
+	    (with-temp-buffer
+	      (insert-file-contents file)
+	      (read (current-buffer)))))))
+
+(defun rt-liber-store-load ()
+  "Ensure that the store has been loaded."
+  (when (not (hash-table-p rt-liber-store))
+    (rt-liber-store-read)))
+
+(defun rt-liber-store-ticket-property (key value ticket-id)
+  "Relate KEY and VALUE to TICKET-ID."
+  (rt-liber-store-load)
+  (let ((existing (gethash ticket-id rt-liber-store)))
+    (when (not existing)
+      (setq existing (make-hash-table :test 'equal)))
+    (puthash key value existing)
+    (puthash ticket-id existing rt-liber-store)
+    (rt-liber-store-write)))
+
+
+;;; ------------------------------------------------------------------
+;;; Interface
+;;; ------------------------------------------------------------------
+
+(defun rt-liber-set-ancillary-text (text)
+  "Store ancillary string TEXT for the ticket at point."
+  (let ((id (rt-liber-browser-ticket-id-at-point))
+	(inhibit-read-only t)
+	message)
+    (rt-liber-store-ticket-property "text" text id)
+    (if (and rt-liber-ticket-list rt-liber-query)
+	(rt-liber-ticketlist-browser-redraw
+	 rt-liber-ticket-list rt-liber-query)
+      (setq message " (refresh ticket-browser to see changes)"))
+    (rt-liber-browser-move-point-to-ticket id)
+    (minibuffer-message "stored text for ticket %s%s"
+			id (or message ""))))
+
+(defun rt-liber-get-ancillary-text (ticket-id)
+  "Return the TEXT field for TICKET-ID or an empty string."
+  (rt-liber-store-load)
+  (let ((existing (gethash ticket-id rt-liber-store)))
+    (if existing
+	(or (gethash "text" existing) "")
+      "")))
+
+(defun rt-liber-ancillary-format-f (ticket-id)
+  "Default formatting function for ancillary data."
+  (rt-liber-get-ancillary-text ticket-id))
+
+(defun rt-liber-get-anc (ticket-id)
+  "Return formatted ancillary data string for ticket TICKET-ID."
+  (funcall rt-liber-ancillary-format-f ticket-id))
+
+(provide 'rt-liberation-storage)
+
+;;; rt-liberation-storage.el ends here.