2007-01-17 [colin] 2.7.1cvs16
[claws.git] / src / folder.h
index bdde535c22891c8f91db7c4d033023efa6c2c006..57acfee4b79e579a30272425d53a2edb5b75579a 100644 (file)
@@ -1,6 +1,8 @@
+/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
+
 /*
  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
- * Copyright (C) 1999-2002 Hiroyuki Yamamoto
+ * Copyright (C) 1999-2007 Hiroyuki Yamamoto and the Claws Mail team
  *
  * 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
@@ -14,7 +16,7 @@
  *
  * 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.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #ifndef __FOLDER_H__
 #include <glib.h>
 #include <time.h>
 
-typedef struct _Folder                 Folder;
-typedef struct _FolderClass            FolderClass;
-typedef struct _LocalFolder            LocalFolder;
-typedef struct _RemoteFolder           RemoteFolder;
-#if 0
-typedef struct _MaildirFolder          MaildirFolder;
-#endif
-typedef struct _FolderItem             FolderItem;
-typedef struct _FolderItemUpdateData   FolderItemUpdateData;
-
-#include "prefs_folder_item.h"
+typedef struct _Folder         Folder;
+typedef struct _FolderClass    FolderClass;
 
-#include "prefs_account.h"
-#include "session.h"
-#include "procmsg.h"
-#include "msgcache.h"
+typedef struct _FolderItem     FolderItem;
+typedef struct _FolderUpdateData       FolderUpdateData;
+typedef struct _FolderItemUpdateData   FolderItemUpdateData;
+typedef struct _PersistPrefs           PersistPrefs;
 
 #define FOLDER(obj)            ((Folder *)obj)
-#define FOLDER_TYPE(obj)       (FOLDER(obj)->class->type)
-
-#define LOCAL_FOLDER(obj)      ((LocalFolder *)obj)
-#define REMOTE_FOLDER(obj)     ((RemoteFolder *)obj)
+#define FOLDER_CLASS(obj)      (FOLDER(obj)->klass)
+#define FOLDER_TYPE(obj)       (FOLDER(obj)->klass->type)
 
 #define FOLDER_IS_LOCAL(obj)   (FOLDER_TYPE(obj) == F_MH      || \
                                 FOLDER_TYPE(obj) == F_MBOX    || \
                                 FOLDER_TYPE(obj) == F_MAILDIR)
 
-#if 0
-#define MAILDIR_FOLDER(obj)    ((MaildirFolder *)obj)
-#endif
-
 #define FOLDER_ITEM(obj)       ((FolderItem *)obj)
 
+#define FOLDER_UPDATE_HOOKLIST "folder_update"
 #define FOLDER_ITEM_UPDATE_HOOKLIST "folder_item_update"
 
 typedef enum
@@ -103,17 +91,30 @@ typedef enum
 
 typedef enum
 {
-       F_MOVE_OK,
-       F_MOVE_FAILED_DEST_IS_PARENT,
-       F_MOVE_FAILED_DEST_IS_CHILD,
-       F_MOVE_FAILED_DEST_OUTSIDE_MAILBOX,
-       F_MOVE_FAILED
-} FolderMoveStatus;
+       F_MOVE_OK = 0,
+       F_MOVE_FAILED_DEST_IS_PARENT = -1,
+       F_MOVE_FAILED_DEST_IS_CHILD = -2,
+       F_MOVE_FAILED_DEST_OUTSIDE_MAILBOX = -3,
+       F_MOVE_FAILED = -4
+} FolderItemMoveResult;
+
+typedef enum
+{
+       FOLDER_ADD_FOLDER               = 1 << 0,
+       FOLDER_REMOVE_FOLDER            = 1 << 1,
+       FOLDER_TREE_CHANGED             = 1 << 2,
+       FOLDER_ADD_FOLDERITEM           = 1 << 3,
+       FOLDER_REMOVE_FOLDERITEM        = 1 << 4,
+       FOLDER_RENAME_FOLDERITEM        = 1 << 5
+} FolderUpdateFlags;
 
 typedef enum
 {
        F_ITEM_UPDATE_MSGCNT = 1 << 0,
        F_ITEM_UPDATE_CONTENT = 1 << 1,
+       F_ITEM_UPDATE_ADDMSG = 1 << 2,
+       F_ITEM_UPDATE_REMOVEMSG = 1 << 3,
+       F_ITEM_UPDATE_NAME = 1 << 4
 } FolderItemUpdateFlags;
 
 typedef void (*FolderUIFunc)           (Folder         *folder,
@@ -122,15 +123,24 @@ typedef void (*FolderUIFunc)              (Folder         *folder,
 typedef void (*FolderDestroyNotify)    (Folder         *folder,
                                         FolderItem     *item,
                                         gpointer        data);
-typedef void (*FolderItemFunc)         (FolderItem     *item,
+typedef void (*FolderItemFunc) (FolderItem     *item,
                                         gpointer        data);
 
+
+#include "folder_item_prefs.h"
+
+#include "procmsg.h"
+#include "msgcache.h"
+#include "xml.h"
+#include "prefs_account.h"
+
 struct _Folder
 {
-       FolderClass *class;
+       FolderClass *klass;
 
        gchar *name;
        PrefsAccount *account;
+       guint sort;
 
        FolderItem *inbox;
        FolderItem *outbox;
@@ -150,115 +160,465 @@ struct _Folder
 
 struct _FolderClass
 {
+       /**
+        * A numeric identifier for the FolderClass. Will be removed in the future
+        */
        FolderType  type;
+       /**
+        * A string identifier for the FolderClass. Currently used in folderlist.xml.
+        * Should be lowercase.
+        */
        gchar      *idstr;
-
+       /**
+        * A string for the User Interface that identifies the FolderClass to the
+        * user. Can be upper and lowercase unlike the idstr.
+        */
+       gchar      *uistr;
+       
        /* virtual functions */
-/*
-       GSList * (*get_msg_list)        (Folder         *folder,
-                                        FolderItem     *item,
-                                        gboolean        use_cache);
-*/
-       FolderItem *(*item_new)         (Folder         *folder);
-       void     (*item_destroy)        (Folder         *folder,
-                                        FolderItem     *item);
-       gchar *  (*fetch_msg)           (Folder         *folder,
-                                        FolderItem     *item,
-                                        gint            num);
-       MsgInfo * (*get_msginfo)        (Folder         *folder,
-                                        FolderItem     *item,
-                                        gint            num);
-       GSList  * (*get_msginfos)       (Folder         *folder,
-                                        FolderItem     *item,
-                                        GSList         *msgnum_list);
-       gint     (*add_msg)             (Folder         *folder,
-                                        FolderItem     *dest,
-                                        const gchar    *file,
-                                        gboolean        remove_source);
-       gint     (*move_msg)            (Folder         *folder,
-                                        FolderItem     *dest,
-                                        MsgInfo        *msginfo);
-       gint     (*move_msgs_with_dest) (Folder         *folder,
-                                        FolderItem     *dest,
-                                        GSList         *msglist);
-       gint     (*copy_msg)            (Folder         *folder,
-                                        FolderItem     *dest,
-                                        MsgInfo        *msginfo);
-       gint     (*copy_msgs_with_dest) (Folder         *folder,
-                                        FolderItem     *dest,
-                                        GSList         *msglist);
-       gint     (*remove_msg)          (Folder         *folder,
-                                        FolderItem     *item,
-                                        gint            num);
-       gint     (*remove_msgs)         (Folder         *folder,
-                                        FolderItem     *item,
-                                        GSList         *msglist);
-       gint     (*remove_all_msg)      (Folder         *folder,
-                                        FolderItem     *item);
-       gboolean (*is_msg_changed)      (Folder         *folder,
-                                        FolderItem     *item,
-                                        MsgInfo        *msginfo);
-       gint     (*scan)                (Folder         *folder);
-       gint     (*get_num_list)        (Folder         *folder,
-                                        FolderItem     *item,
-                                        GSList        **list);
-       void     (*scan_tree)           (Folder         *folder);
-
-       gint     (*create_tree)         (Folder         *folder);
-       FolderItem * (*create_folder)   (Folder         *folder,
-                                        FolderItem     *parent,
-                                        const gchar    *name);
-       gint     (*rename_folder)       (Folder         *folder,
-                                        FolderItem     *item,
-                                        const gchar    *name);
-       gint     (*remove_folder)       (Folder         *folder,
-                                        FolderItem     *item);
-
-       void     (*destroy)             (Folder         *folder);
-       void     (*update_mark)         (Folder         *folder,
-                                        FolderItem     *item);
-       void     (*change_flags)        (Folder         *folder,
-                                        FolderItem     *item,
-                                        MsgInfo        *info);
-       void     (*finished_copy)       (Folder * folder, FolderItem * item);
-       void     (*finished_remove)     (Folder * folder, FolderItem * item);
-       gboolean (*check_msgnum_validity) (Folder * folder, FolderItem * item);
-};
-
-struct _LocalFolder
-{
-       Folder folder;
-
-       gchar *rootpath;
-};
-
-struct _RemoteFolder
-{
-       Folder folder;
-
-       Session *session;
-};
 
-#if 0
-struct _MaildirFolder
-{
-       LocalFolder lfolder;
+       /* Folder funtions */
+       /**
+        * Create a new \c Folder of this \c FolderClass.
+        *
+        * \param name The name of the new Folder
+        * \param path The path of the new Folder
+        * \return The new \c Folder, or \c NULL when creating the \c Folder 
+        *         failed
+        */
+       Folder          *(*new_folder)          (const gchar    *name,
+                                                const gchar    *path);
+       /**
+        * Destroy a \c Folder of this \c FolderClass, frees all resources
+        * allocated by the Folder
+        *
+        * \param folder The \c Folder that should be destroyed.
+        */
+       void            (*destroy_folder)       (Folder         *folder);
+       /**
+        * Set the Folder's internal attributes from an \c XMLTag. Also sets the
+        * parameters of the root-FolderItem of the \c Folder. If \c NULL
+        * the default function of the basic \ยข FolderClass is used, so it
+        * must not be \c NULL if one of the parent \c FolderClasses has a \c set_xml
+        * function. In that case the parent \c FolderClass' \c set_xml function
+        * can be used or it has to be called with the \c folder and \c tag by
+        * the implementation.
+        *
+        * \param folder The \c Folder which's attributes should be updated
+        * \param tag The \c XMLTag containing the \c XMLAttrs for the attributes
+        */
+       void             (*set_xml)             (Folder         *folder,
+                                                XMLTag         *tag);
+       /**
+        * Get an \c XMLTag for the attributes of the \c Folder and the root-FolderItem
+        * of the \c Folder. If \c NULL the default implementation for the basic
+        * FolderClass will be used, so it must not be \c NULL if one of the
+        * parent \c FolderClasses has it's own implementation for \c get_xml.
+        * In that case the parent FolderClass' \c get_xml function can be
+        * used or the \c XMLTag has to be fetched from the parent's \c get_xml
+        * function and then the \c FolderClass specific attributes can be
+        * added to it.
+        *
+        * \param Folder The \c Folder which's attributes should be set in the
+        *               \c XMLTag's \c XMLAttrs
+        * \return XMLTag An \c XMLTag with \c XMLAttrs containing the \c Folder's
+        *                attributes.
+        */
+       XMLTag          *(*get_xml)             (Folder         *folder);
+       /**
+        * Rebuild the folder tree from the folder's data
+        * \todo New implementations of MH and IMAP are actually syncronizing
+        *       the tree with the folder by reusing the old \c FolderItems.
+        *       Claws still destroys the old tree before calling this function.
+        *
+        * \param folder The folder which's tree should be rebuild
+        * \return 0 on success, a negative number otherwise
+        */
+       gint            (*scan_tree)            (Folder         *folder);
+
+       gint            (*create_tree)          (Folder         *folder);
+
+       /* FolderItem functions */
+       /**
+        * Create a new \c FolderItem structure for the \c FolderClass.
+        * \c FolderClasses can have their own \c FolderItem structure with
+        * extra attributes.
+        *
+        * \param folder The \c Folder for that a \c FolderItem should be
+        *               created
+        * \return The new \c FolderItem or NULL in case of an error
+        */
+       FolderItem      *(*item_new)            (Folder         *folder);
+       /**
+        * Destroy a \c FolderItem from this \c FolderClass. The \c FolderClass
+        * has to free all private resources used by the \c FolderItem.
+        *
+        * \param folder The \c Folder of the \c FolderItem
+        * \param item The \c FolderItem that should be destroyed
+        */
+       void             (*item_destroy)        (Folder         *folder,
+                                                FolderItem     *item);
+       /**
+        * Set the \c FolderItem's internal attributes from an \c XMLTag. If
+        * \c NULL the default function of the basic \c FolderClass is used, so it
+        * must not be \c NULL if one of the parent \c FolderClasses has a \c item_set_xml
+        * function. In that case the parent \c FolderClass' \c item_set_xml function
+        * can be used or it has to be called with the \c folder, \c item and \c tag by
+        * the implementation.
+        *
+        * \param folder The \c Folder of the \c FolderItem
+        * \param item The \c FolderItems which's attributes should be set
+        * \param tag The \c XMLTag with \c XMLAttrs for the \c FolderItem's
+        *            attributes
+        */
+       void             (*item_set_xml)        (Folder         *folder,
+                                                FolderItem     *item,
+                                                XMLTag         *tag);
+       /**
+        * Get an \c XMLTag for the attributes of the \c FolderItem If \c NULL
+        * the default implementation for the basic \c FolderClass will be used,
+        * so it must not be \c NULL if one of the parent \c FolderClasses has
+        * it's own implementation for \c item_get_xml. In that case the parent 
+        * FolderClass' \c item_get_xml function can be used or the \c XMLTag
+        * has to be fetched from the parent's \c item_get_xml function and 
+        * then the \c FolderClass specific attributes can be added to it.
+        *
+        * \param folder The \c Folder of the \c FolderItem
+        * \parem item The \c FolderItem which's attributes should be set in
+        *             the \c XMLTag's \c XMLAttrs
+        * \return An \c XMLTag with \c XMLAttrs containing the \c FolderItem's
+        *         attributes.
+        */
+       XMLTag          *(*item_get_xml)        (Folder         *folder,
+                                                FolderItem     *item);
+       /**
+        * Get a local path for the \c FolderItem where Sylpheed can save
+        * it's cache data. For local directory based folders this can be the
+        * real path. For other folders it can be the local cache directory.
+        *
+        * \param folder The \c Folder of the \c FolderItem
+        * \param item The \c FolderItem for that a path should be returned
+        * \return A path for the \c FolderItem
+        */
+       gchar           *(*item_get_path)       (Folder         *folder,
+                                                FolderItem     *item);
+       /**
+        * Create a new \c FolderItem. The function must use folder_item_append
+        * to add the new \c FolderItem to the folder tree
+        *
+        * \param folder The \c Folder in which a new \c FolderItem should be
+        *               created
+        * \param parent \c The parent \c FolderItem for the new \c FolderItem
+        * \parem name The name for the new \c FolderItem
+        * \return The new \c FolderItem
+        */
+       FolderItem      *(*create_folder)       (Folder         *folder,
+                                                FolderItem     *parent,
+                                                const gchar    *name);
+       /**
+        * Rename a \c FolderItem
+        *
+        * \param folder The \c Folder of the \c FolderItem that should be
+        *               renamed
+        * \param item The \c FolderItem that should be renamed
+        * \param name The new name of the \c FolderItem
+        * \return 0 on success, a negative number otherwise
+        */
+       gint             (*rename_folder)       (Folder         *folder,
+                                                FolderItem     *item,
+                                                const gchar    *name);
+       /**
+        * Remove a \c FolderItem from the \c Folder
+        *
+        * \param folder The \c Folder that contains the \c FolderItem
+        * \param item The \c FolderItem that should be removed
+        * \return 0 on sucess, a negative number otherwise
+        */
+       gint             (*remove_folder)       (Folder         *folder,
+                                                FolderItem     *item);
+       /**
+        * Close a \c FolderItem. Called when the user deselects a
+        * \c FolderItem.
+        * 
+        * \attention In Sylpheed-Main operations can only be done on the
+        *            \c FolderItem that is opened in the SummaryView. This
+        *            \c FolderItem will be closed when you select a new
+        *            \c FolderItem in the FolderView. In Claws operations can
+        *            be done any time on any folder and you should not expect
+        *            that all \c FolderItems get closed after operations
+        *
+        * \param folder The \c Folder that contains the \c FolderItem
+        * \param item The \c FolderItem that should be closed
+        * \return 0 on success, a negative number otherwise
+        */
+       gint             (*close)               (Folder         *folder,
+                                                FolderItem     *item);
+       /**
+        * Get the list of message numbers for the messages in the \c FolderItem
+        *
+        * \param folder The \c Folder that contains the \c FolderItem
+        * \param item The \c FolderItem for which the message numbers should
+        *             be fetched
+        * \param list Pointer to a GSList where message numbers have to be
+        *             added. Because of the implementation of the GSList that
+        *             changes the pointer of the GSList itself when the first
+        *             item is added this is a pointer to a pointer to a
+        *             GSList structure. Use *item = g_slist_...(*item, ...)
+        *             operations to modify the list.
+        * \param old_uids_valid In some \c Folders the old UIDs can be invalid.
+        *                       Set this pointer to a gboolean to TRUE if the
+        *                       old UIDs are still valid, otherwise set it to
+        *                       FALSE and the folder system will discard it's
+        *                       cache data of the previously know UIDs
+        * \return The number of message numbers add to the list on success,
+        *         a negative number otherwise.
+        */
+       gint             (*get_num_list)        (Folder         *folder,
+                                                FolderItem     *item,
+                                                GSList        **list,
+                                                gboolean       *old_uids_valid);
+       /**
+        * Tell the folder system if a \c FolderItem should be scanned
+        * (cache data syncronized with the folder content) when it is required
+        * because the \c FolderItem's content changed. If NULL the folder
+        * system will not do automatic scanning of \c FolderItems
+        *
+        * \param folder The \c Folder that contains the \c FolderItem
+        * \param item The \c FolderItem which's content should be checked
+        * \return TRUE if the \c FolderItem should be scanned, FALSE otherwise
+        */
+       gboolean        (*scan_required)        (Folder         *folder,
+                                                FolderItem     *item);
+
+       /* Message functions */
+       /**
+        * Get a MsgInfo for a message in a \c FolderItem
+        *
+        * \param folder The \c Folder containing the message
+        * \param item The \c FolderItem containing the message
+        * \param num The message number of the message
+        * \return A pointer to a \c MsgInfo decribing the message or \c 
+        *         NULL in case of an error
+        */
+       MsgInfo         *(*get_msginfo)         (Folder         *folder,
+                                                FolderItem     *item,
+                                                gint            num);
+       /**
+        * Get \c MsgInfos for a list of message numbers
+        *
+        * \param folder The \c Folder containing the message
+        * \param item The \c FolderItem containing the message
+        * \param msgnum_list A list of message numbers for which the
+        *                    \c MsgInfos should be fetched
+        * \return A list of \c MsgInfos for the messages in the \c msgnum_list
+        *         that really exist. Messages that are not found can simply
+        *         be left out.
+        */
+       MsgInfoList     *(*get_msginfos)        (Folder         *folder,
+                                                FolderItem     *item,
+                                                MsgNumberList  *msgnum_list);
+       /**
+        * Get the filename for a message. This can either be the real message
+        * file for local folders or a temporary file for remote folders.
+        *
+        * \param folder The \c Folder containing the message
+        * \param item The \c FolderItem containing the message
+        * \param num The message number of the message
+        * \return A string with the filename of the message file. The returned
+        *         string has to be freed with \c g_free(). If message is not
+        *         available return NULL.
+        */
+       gchar           *(*fetch_msg)           (Folder         *folder,
+                                                FolderItem     *item,
+                                                gint            num);
+       gchar           *(*fetch_msg_full)      (Folder         *folder,
+                                                FolderItem     *item,
+                                                gint            num,
+                                                gboolean        headers,
+                                                gboolean        body);
+       /**
+        * Add a single message file to a folder with the given flags (if
+        * flag handling is supported by the folder)
+        *
+        * \param folder The target \c Folder for the message
+        * \param dest the target \c FolderItem for the message
+        * \param file The file that contains the message
+        * \param flags The flags the new message should have in the folder
+        * \return 0 on success, a negative number otherwise
+        */
+       gint            (*add_msg)              (Folder         *folder,
+                                                FolderItem     *dest,
+                                                const gchar    *file,
+                                                MsgFlags       *flags);
+       /**
+        * Add multiple messages to a \c FolderItem. If NULL the folder
+        * system will add messages with \c add_msg one by one
+        *
+        * \param folder The target \c Folder for the messages
+        * \param dest the target \c FolderItem for the messages
+        * \param file_list A list of \c MsgFileInfos which contain the
+        *                  filenames and flags for the new messages
+        * \param relation Insert tuples of (MsgFileInfo, new message number) to
+        *                 provide feedback for the folder system which new
+        *                 message number a \c MsgFileInfo got in dest. Insert
+        *                 0 if the new message number is unknown.
+        */
+       gint            (*add_msgs)             (Folder         *folder,
+                                                FolderItem     *dest,
+                                                GSList         *file_list,
+                                                GRelation      *relation);
+       /**
+        * Copy a message to a FolderItem
+        *
+        * \param folder The \c Folder of the destination FolderItem
+        * \param dest The destination \c FolderItem for the message
+        * \param msginfo The message that should be copied
+        * \return The message number the copied message got, 0 if it is
+        *         unknown because message numbers are assigned by an external
+        *         system and not available after copying or a negative number
+        *         if an error occuried
+        */
+       gint            (*copy_msg)             (Folder         *folder,
+                                                FolderItem     *dest,
+                                                MsgInfo        *msginfo);
+       /**
+        * Copy multiple messages to a \c FolderItem. If \c NULL the folder
+        * system will use \c copy_msg to copy messages one by one.
+        *
+        * \param folder The \c Folder of the destination FolderItem
+        * \param dest The destination \c FolderItem for the message
+        * \param msglist A list of \c MsgInfos which should be copied to dest
+        * \param relation Insert tuples of (MsgInfo, new message number) to
+        *                 provide feedback for the folder system which new
+        *                 message number a \c MsgInfo got in dest. Insert
+        *                 0 if the new message number is unknown.
+        * \return 0 on success, a negative number otherwise
+        */
+       gint            (*copy_msgs)            (Folder         *folder,
+                                                FolderItem     *dest,
+                                                MsgInfoList    *msglist,
+                                                GRelation      *relation);
+       /**
+        * Remove a message from a \c FolderItem.
+        *
+        * \param folder The \c Folder of the message
+        * \param item The \c FolderItem containing the message
+        * \param num The message number of the message
+        * \return 0 on success, a negative number otherwise
+        */
+       gint            (*remove_msg)           (Folder         *folder,
+                                                FolderItem     *item,
+                                                gint            num);
+       gint            (*remove_msgs)          (Folder         *folder,
+                                                FolderItem     *item,
+                                                MsgInfoList    *msglist,
+                                                GRelation      *relation);
+       /**
+        * Remove all messages in a \ c FolderItem
+        *
+        * \param folder The \c Folder of the \c FolderItem
+        * \param item The \FolderItem which's messages should be deleted
+        * \return 0 on succes, a negative number otherwise
+        */
+       gint            (*remove_all_msg)       (Folder         *folder,
+                                                FolderItem     *item);
+       /**
+        * Check if a message has been modified by someone else
+        *
+        * \param folder The \c Folder of the message
+        * \param item The \c FolderItem containing the message
+        * \param msginfo The \c MsgInfo for the message that should be checked
+        * \return \c TRUE if the message was modified, \c FALSE otherwise
+        */
+       gboolean        (*is_msg_changed)       (Folder         *folder,
+                                                FolderItem     *item,
+                                                MsgInfo        *msginfo);
+       /**
+        * Update a message's flags in the folder data. If NULL only the
+        * internal flag management will be used. The function has to set
+        * \c msginfo->flags.perm_flags. It does not have to set the flags
+        * that it got as \c newflags. If a flag can not be set in this
+        * \c FolderClass the function can refuse to set it. Flags that are not
+        * supported by the \c FolderClass should not be refused. They will be
+        * managed by the internal cache in this case.
+        *
+        * \param folder The \c Folder of the message
+        * \param item The \c FolderItem of the message
+        * \param msginfo The \c MsgInfo for the message which's flags should be
+        *                updated
+        * \param newflags The flags the message should get
+        */
+       void            (*change_flags)         (Folder         *folder,
+                                                FolderItem     *item,
+                                                MsgInfo        *msginfo,
+                                                MsgPermFlags    newflags);
+       /**
+        * Get the flags for a list of messages. Flags that are not supported
+        * by the folder should be preserved. They can be copied from
+        * \c msginfo->flags.perm_flags
+        *
+        * \param folder The \c Folder of the messages
+        * \param item The \c FolderItem of the messages
+        * \param msglist The list of \c MsgInfos for which the flags should
+        *                   be returned
+        * \param msgflags A \c GRelation for tuples of (MsgInfo, new permanent
+         *        flags for MsgInfo). Add tuples for the messages in msglist
+        * \return 0 on success, a negative number otherwise
+        */
+       gint            (*get_flags)            (Folder         *folder,
+                                                FolderItem     *item,
+                                                MsgInfoList    *msglist,
+                                                GRelation      *msgflags);
+       
+       /* Sets batch mode for a FolderItem. It means that numerous flags updates
+        * could follow, and the FolderClass implementation can cache them in order
+        * to process them later when set_false will be called again with the
+        * batch parameter set to FALSE. 
+        */
+       void            (*set_batch)            (Folder         *folder,
+                                                FolderItem     *item,
+                                                gboolean        batch);
+       /* Called when switching offline or asking for synchronisation. the imple
+        * mentation should do what's necessary to be able to read mails present
+        * in the FolderItem at this time with no network connectivity. 
+        */
+       void            (*synchronise)          (FolderItem     *item);
+       
+       /* Passed from claws-mail --subscribe scheme://uri. Implementations
+        * should check if they handle this type of URI, and return TRUE in this
+        * case after having subscribed it.
+        */
+       gboolean        (*subscribe)            (Folder         *folder,
+                                                const gchar    *uri);
+       
+       /* Gets the preferred sort key and type for a folderclass. */
+       void            (*get_sort_type)        (Folder         *folder,
+                                                FolderSortKey  *sort_key,
+                                                FolderSortType *sort_type);
+       
+       /* Copies internal FolderItem data from one folderItem to another. Used
+        * when moving folders (this move is in reality a folder creation, content
+        * move, folder delettion).
+        */
+       void            (*copy_private_data)    (Folder         *folder,
+                                                FolderItem     *src,
+                                                FolderItem     *dest);
 };
-#endif
 
 struct _FolderItem
 {
        SpecialFolderItemType stype;
 
-       gchar *name;
-       gchar *path;
+       gchar *name; /* UTF-8 */
+       gchar *path; /* UTF-8 */
 
        time_t mtime;
 
-       gint new;
-       gint unread;
-       gint total;
-       gint unreadmarked;
+       gint new_msgs;
+       gint unread_msgs;
+       gint total_msgs;
+       gint unreadmarked_msgs;
+       gint marked_msgs;
 
        gint last_num;
 
@@ -272,6 +632,7 @@ struct _FolderItem
        guint threaded       : 1; /* threaded folder view */
        guint hide_read_msgs : 1; /* hide read messages   */
        guint ret_rcpt       : 1; /* return receipt       */
+       guint search_match   : 1;
 
        gint op_count;
        guint opened         : 1; /* opened by summary view */
@@ -280,7 +641,7 @@ struct _FolderItem
        FolderSortKey sort_key;
        FolderSortType sort_type;
 
-       FolderItem *parent;
+       GNode *node;
 
        Folder *folder;
 
@@ -292,10 +653,16 @@ struct _FolderItem
 
        gpointer data;
 
-       PrefsFolderItem * prefs;
+       FolderItemPrefs * prefs;
+       
+       /* for faster search of special parents */
+       SpecialFolderItemType parent_stype;
+       gboolean processing_pending;
+       gboolean scanning;
 };
 
-typedef struct {
+struct _PersistPrefs
+{
        FolderSortKey   sort_key;
        FolderSortType  sort_type;
        guint           collapsed       : 1;
@@ -303,67 +670,92 @@ typedef struct {
        guint           threaded        : 1;
        guint           hide_read_msgs  : 1; /* CLAWS */
        guint           ret_rcpt        : 1; /* CLAWS */
-} PersistPrefs;
+};
+
+struct _FolderUpdateData
+{
+       Folder                  *folder;
+       FolderUpdateFlags        update_flags;
+       FolderItem              *item;
+};
 
 struct _FolderItemUpdateData
 {
        FolderItem              *item;
        FolderItemUpdateFlags    update_flags;
+       MsgInfo                 *msg;
 };
 
-void       folder_system_init          ();
-void       folder_register_class       (FolderClass    *class);
-Folder     *folder_new                 (FolderType      type,
-                                        const gchar    *name,
-                                        const gchar    *path);
-void        folder_local_folder_init   (Folder         *folder,
-                                        const gchar    *name,
-                                        const gchar    *path);
-void        folder_remote_folder_init  (Folder         *folder,
+void       folder_system_init          (void);
+void       folder_register_class       (FolderClass    *klass);
+void       folder_unregister_class     (FolderClass    *klass);
+Folder     *folder_new                 (FolderClass    *type,
                                         const gchar    *name,
                                         const gchar    *path);
+void       folder_init                 (Folder         *folder,
+                                        const gchar    *name);
 
 void        folder_destroy             (Folder         *folder);
-void        folder_local_folder_destroy        (LocalFolder    *lfolder);
-void        folder_remote_folder_destroy(RemoteFolder  *rfolder);
 
-FolderItem *folder_item_new    (Folder         *folder,
-                                const gchar    *name,
-                                const gchar    *path);
-void        folder_item_append (FolderItem     *parent,
-                                FolderItem     *item);
-void        folder_item_remove (FolderItem     *item);
-void        folder_item_destroy        (FolderItem     *item);
+void       folder_set_xml              (Folder          *folder,
+                                        XMLTag          *tag);
+XMLTag            *folder_get_xml              (Folder          *folder);
+
+FolderItem *folder_item_new            (Folder         *folder,
+                                        const gchar    *name,
+                                        const gchar    *path);
+void        folder_item_append         (FolderItem     *parent,
+                                        FolderItem     *item);
+void        folder_item_remove         (FolderItem     *item);
+void        folder_item_remove_children        (FolderItem     *item);
+void        folder_item_destroy                (FolderItem     *item);
+FolderItem *folder_item_parent         (FolderItem     *item);
+
+void       folder_item_set_xml         (Folder          *folder,
+                                        FolderItem      *item,
+                                        XMLTag          *tag);
+XMLTag            *folder_item_get_xml         (Folder          *folder,
+                                        FolderItem      *item);
 
 void        folder_set_ui_func (Folder         *folder,
                                 FolderUIFunc    func,
                                 gpointer        data);
 void        folder_set_name    (Folder         *folder,
                                 const gchar    *name);
+void       folder_set_sort     (Folder         *folder,
+                                guint           sort);
 void        folder_tree_destroy        (Folder         *folder);
 
 void   folder_add              (Folder         *folder);
+void   folder_remove           (Folder         *folder);
 
 GList *folder_get_list         (void);
 gint   folder_read_list                (void);
 void   folder_write_list       (void);
-void   folder_scan_tree                (Folder *folder);
+void   folder_scan_tree                (Folder *folder, gboolean rebuild);
+void   folder_fast_scan_tree   (Folder *folder);
 FolderItem *folder_create_folder(FolderItem    *parent, const gchar *name);
+gint   folder_item_rename      (FolderItem *item, gchar *newname);
 void   folder_update_op_count          (void);
 void   folder_func_to_all_folders      (FolderItemFunc function,
                                         gpointer data);
-void   folder_count_total_msgs (guint          *new,
-                                guint          *unread,
-                                guint          *unreadmarked,
-                                guint          *total);
+void folder_count_total_msgs(guint *new_msgs, guint *unread_msgs, 
+                            guint *unreadmarked_msgs, guint *marked_msgs,
+                            guint *total_msgs);
+gchar *folder_get_status       (GPtrArray      *folders,
+                                gboolean        full);
 
 Folder     *folder_find_from_path              (const gchar    *path);
 Folder     *folder_find_from_name              (const gchar    *name,
-                                                FolderClass    *class);
+                                                FolderClass    *klass);
 FolderItem *folder_find_item_from_path         (const gchar    *path);
+FolderClass *folder_get_class_from_string      (const gchar    *str);
+FolderItem *folder_find_child_item_by_name     (FolderItem     *item,
+                                                const gchar    *name);
 gchar      *folder_get_identifier              (Folder         *folder);
 gchar      *folder_item_get_identifier         (FolderItem     *item);
 FolderItem *folder_find_item_from_identifier   (const gchar    *identifier);
+gchar     *folder_item_get_name                (FolderItem     *item);
 
 Folder     *folder_get_default_folder  (void);
 FolderItem *folder_get_default_inbox   (void);
@@ -375,44 +767,62 @@ FolderItem *folder_get_default_processing (void);
 void folder_set_missing_folders                (void);
 void folder_unref_account_all          (PrefsAccount   *account);
 
-gchar *folder_get_path                 (Folder         *folder);
+/* return value is locale encoded file name */
 gchar *folder_item_get_path            (FolderItem     *item);
 
 gint   folder_item_open                        (FolderItem     *item);
-void   folder_item_close               (FolderItem     *item);
+gint   folder_item_close               (FolderItem     *item);
 gint   folder_item_scan                        (FolderItem     *item);
+gint   folder_item_scan_full           (FolderItem     *item, 
+                                        gboolean        filtering);
+gint   folder_item_syncronize_flags    (FolderItem     *item);
 void   folder_item_scan_foreach                (GHashTable     *table);
 MsgInfo *folder_item_get_msginfo       (FolderItem     *item,
                                         gint            num);
 MsgInfo *folder_item_get_msginfo_by_msgid(FolderItem   *item,
                                         const gchar    *msgid);
 GSList *folder_item_get_msg_list       (FolderItem     *item);
+/* return value is locale charset */
 gchar *folder_item_fetch_msg           (FolderItem     *item,
                                         gint            num);
+gchar *folder_item_fetch_msg_full      (FolderItem     *item,
+                                        gint            num, 
+                                        gboolean        get_headers,
+                                        gboolean        get_body);
+gint   folder_item_fetch_all_msg       (FolderItem     *item);
 gint   folder_item_add_msg             (FolderItem     *dest,
                                         const gchar    *file,
+                                        MsgFlags       *flags,
                                         gboolean        remove_source);
+gint   folder_item_add_msgs             (FolderItem     *dest,
+                                         GSList         *file_list,
+                                         gboolean        remove_source);
 gint   folder_item_move_to             (FolderItem     *src,
                                         FolderItem     *dest,
-                                        FolderItem    **new_item);
+                                        FolderItem    **new_item,
+                                        gboolean        copy);
 gint   folder_item_move_msg            (FolderItem     *dest,
                                         MsgInfo        *msginfo);
-gint   folder_item_move_msgs_with_dest (FolderItem     *dest,
+gint   folder_item_move_msgs           (FolderItem     *dest,
                                         GSList         *msglist);
 gint   folder_item_copy_msg            (FolderItem     *dest,
                                         MsgInfo        *msginfo);
-gint   folder_item_copy_msgs_with_dest (FolderItem     *dest,
+gint   folder_item_copy_msgs           (FolderItem     *dest,
                                         GSList         *msglist);
 gint   folder_item_remove_msg          (FolderItem     *item,
                                         gint            num);
 gint   folder_item_remove_msgs         (FolderItem     *item,
                                         GSList         *msglist);
 gint   folder_item_remove_all_msg      (FolderItem     *item);
+void   folder_item_change_msg_flags    (FolderItem     *item,
+                                        MsgInfo        *msginfo,
+                                        MsgPermFlags    newflags);
 gboolean folder_item_is_msg_changed    (FolderItem     *item,
                                         MsgInfo        *msginfo);
+/* return value is locale chaset */
 gchar *folder_item_get_cache_file      (FolderItem     *item);
 gchar *folder_item_get_mark_file       (FolderItem     *item);
-gchar * folder_item_get_identifier(FolderItem * item);
+gchar * folder_item_get_identifier     (FolderItem * item);
 
 GHashTable *folder_persist_prefs_new   (Folder *folder);
 void folder_persist_prefs_free         (GHashTable *pptable);
@@ -420,7 +830,8 @@ const PersistPrefs *folder_get_persist_prefs
                                        (GHashTable *pptable, const char *name);
 
 void folder_item_restore_persist_prefs (FolderItem *item, GHashTable *pptable);
-void folder_clean_cache_memory         ();
+void folder_clean_cache_memory         (FolderItem *protected_item);
+void folder_clean_cache_memory_force   (void);
 void folder_item_write_cache           (FolderItem *item);
 void folder_item_set_default_flags     (FolderItem *dest, MsgFlags *flags);
 
@@ -430,7 +841,23 @@ void folder_item_update                    (FolderItem *item,
                                         FolderItemUpdateFlags update_flags);
 void folder_item_update_recursive      (FolderItem *item,
                                         FolderItemUpdateFlags update_flags);
-void folder_item_update_freeze         ();
-void folder_item_update_thaw           ();
+void folder_item_update_freeze         (void);
+void folder_item_update_thaw           (void);
+void folder_item_set_batch             (FolderItem *item, gboolean batch);
+gboolean folder_has_parent_of_type     (FolderItem *item, SpecialFolderItemType type);
+void folder_synchronise                        (Folder *folder);
+gboolean folder_want_synchronise       (Folder *folder);
+void folder_item_process_open          (FolderItem *item,
+                                        void (*before_proc_func)(gpointer data),
+                                        void (*after_proc_func)(gpointer data),
+                                        gpointer data);
+gboolean folder_subscribe              (const gchar *uri);
+gboolean folder_have_mailbox           (void);
+gboolean folder_item_free_cache                (FolderItem *item, gboolean force);
+void folder_item_change_type           (FolderItem *item,
+                                        SpecialFolderItemType newtype);
+gboolean folder_get_sort_type          (Folder         *folder,
+                                        FolderSortKey  *sort_key,
+                                        FolderSortType *sort_type);
 
 #endif /* __FOLDER_H__ */