path: root/mail/mail-local.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* mail-local.c: Local mailbox support. */

/* 
 * Authors: 
 *  Michael Zucchi <NotZed@ximian.com>
 *  Peter Williams <peterw@ximian.com>
 *  Ettore Perazzoli <ettore@ximian.com>
 *  Dan Winship <danw@ximian.com>
 *
 * Copyright 2000 Ximian, Inc. (www.ximian.com)
 *
 * 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
 */

/*
  TODO:

  If we are going to have all this LocalStore stuff, then the LocalStore
  should have a reconfigure_folder method on it, as, in reality, it is
  the maintainer of this information.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <gnome-xml/xmlmemory.h>
#include <libgnomeui/gnome-dialog.h>
#include <libgnomeui/gnome-dialog-util.h>
#include <glade/glade.h>

#include "Evolution.h"
#include "evolution-storage.h"
#include "evolution-shell-component.h"
#include "evolution-storage-listener.h"

#include "gal/widgets/e-gui-utils.h"
#include "e-util/e-path.h"

#include "camel/camel.h"
#include "camel/camel-vee-store.h"
#include "camel/camel-vee-folder.h"
#include "camel/camel-vtrash-folder.h"

#include "filter/vfolder-context.h"
#include "filter/vfolder-rule.h"
#include "filter/vfolder-editor.h"

#include "mail.h"
#include "mail-local.h"
#include "mail-tools.h"
#include "folder-browser.h"
#include "mail-mt.h"
#include "mail-folder-cache.h"
#include "mail-vfolder.h"

#define d(x)


/* Local folder metainfo */

struct _local_meta {
    char *path;     /* path of metainfo file */

    char *format;       /* format of mailbox */
    char *name;     /* name of mbox itself */
    int indexed;        /* do we index the body? */
};

static struct _local_meta *
load_metainfo(const char *path)
{
    xmlDocPtr doc;
    xmlNodePtr node;
    struct _local_meta *meta;

    meta = g_malloc0(sizeof(*meta));
    meta->path = g_strdup(path);

    d(printf("Loading folder metainfo from : %s\n", meta->path));

    doc = xmlParseFile(meta->path);
    if (doc == NULL) {
        goto dodefault;
    }
    node = doc->root;
    if (strcmp(node->name, "folderinfo")) {
        goto dodefault;
    }
    node = node->childs;
    while (node) {
        if (!strcmp(node->name, "folder")) {
            char *index, *txt;

            txt = xmlGetProp(node, "type");
            meta->format = g_strdup (txt ? txt : "mbox");
            xmlFree (txt);

            txt = xmlGetProp(node, "name");
            meta->name = g_strdup (txt ? txt : "mbox");
            xmlFree (txt);

            index = xmlGetProp(node, "index");
            if (index) {
                meta->indexed = atoi(index);
                xmlFree(index);
            } else
                meta->indexed = TRUE;
            
        }
        node = node->next;
    }
    xmlFreeDoc(doc);
    return meta;

 dodefault:
    meta->format = g_strdup("mbox"); /* defaults */
    meta->name = g_strdup("mbox");
    meta->indexed = TRUE;
    xmlFreeDoc(doc);
    return meta;
}

static void
free_metainfo(struct _local_meta *meta)
{
    g_free(meta->path);
    g_free(meta->format);
    g_free(meta->name);
    g_free(meta);
}

static int
save_metainfo(struct _local_meta *meta)
{
    xmlDocPtr doc;
    xmlNodePtr root, node;
    int ret;

    d(printf("Saving folder metainfo to : %s\n", meta->path));

    doc = xmlNewDoc("1.0");
    root = xmlNewDocNode(doc, NULL, "folderinfo", NULL);
    xmlDocSetRootElement(doc, root);

    node  = xmlNewChild(root, NULL, "folder", NULL);
    xmlSetProp(node, "type", meta->format);
    xmlSetProp(node, "name", meta->name);
    xmlSetProp(node, "index", meta->indexed?"1":"0");

    ret = xmlSaveFile(meta->path, doc);
    xmlFreeDoc(doc);
    return ret;
}


/* MailLocalStore implementation */
#define MAIL_LOCAL_STORE_TYPE     (mail_local_store_get_type ())
#define MAIL_LOCAL_STORE(obj)     (CAMEL_CHECK_CAST((obj), MAIL_LOCAL_STORE_TYPE, MailLocalStore))
#define MAIL_LOCAL_STORE_CLASS(k) (CAMEL_CHECK_CLASS_CAST ((k), MAIL_LOCAL_STORE_TYPE, MailLocalStoreClass))
#define MAIL_IS_LOCAL_STORE(o)    (CAMEL_CHECK_TYPE((o), MAIL_LOCAL_STORE_TYPE))

typedef struct {
    CamelStore parent_object;   

    EvolutionStorage *storage;
    GNOME_Evolution_Storage corba_storage;
    EvolutionStorageListener *local_storage_listener;
    
    char *local_path;
    int local_pathlen;
    GHashTable *folders; /* points to MailLocalFolder */
} MailLocalStore;

typedef struct {
    CamelStoreClass parent_class;
} MailLocalStoreClass;

typedef struct {
    CamelFolder *folder;
    MailLocalStore *local_store;
    char *path, *name, *uri;
} MailLocalFolder;

static MailLocalStore *local_store;

CamelType mail_local_store_get_type (void);

static char *get_name (CamelService *service, gboolean brief);

static CamelFolder *get_folder (CamelStore *store, const char *folder_name,
                guint32 flags, CamelException *ex);
static CamelFolderInfo *get_folder_info (CamelStore *store, const char *top,
                     guint32 flags, CamelException *ex);
static void delete_folder (CamelStore *store, const char *folder_name,
               CamelException *ex);
static void rename_folder (CamelStore *store, const char *old_name,
               const char *new_name, CamelException *ex);

static void init_trash (CamelStore *store);

static CamelStoreClass *local_parent_class;

static void
mail_local_store_class_init (MailLocalStoreClass *mail_local_store_class)
{
    CamelStoreClass *camel_store_class =
        CAMEL_STORE_CLASS (mail_local_store_class);
    CamelServiceClass *camel_service_class =
        CAMEL_SERVICE_CLASS (mail_local_store_class);

    /* virtual method overload */
    camel_service_class->get_name = get_name;

    /* Don't cache folders */
    camel_store_class->hash_folder_name = NULL;
    camel_store_class->compare_folder_name = NULL;
    
    camel_store_class->init_trash = init_trash;
    camel_store_class->get_folder = get_folder;
    camel_store_class->get_folder_info = get_folder_info;
    camel_store_class->free_folder_info = camel_store_free_folder_info_full;
    camel_store_class->delete_folder = delete_folder;
    camel_store_class->rename_folder = rename_folder;

    local_parent_class = (CamelStoreClass *)camel_type_get_global_classfuncs(camel_store_get_type ());
}

static void
mail_local_store_init (gpointer object, gpointer klass)
{
    MailLocalStore *local_store = MAIL_LOCAL_STORE (object);

    local_store->corba_storage = CORBA_OBJECT_NIL;
}

static void
free_local_folder (MailLocalFolder *lf)
{
    if (lf->folder)
        camel_object_unref((CamelObject *)lf->folder);

    g_free(lf->path);
    g_free(lf->name);
    g_free(lf->uri);
    camel_object_unref((CamelObject *)lf->local_store);
}

static void
free_folder (gpointer key, gpointer data, gpointer user_data)
{
    MailLocalFolder *lf = data;

    g_free(key);
    free_local_folder(lf);
}

static void
mail_local_store_finalize (gpointer object)
{
    MailLocalStore *local_store = MAIL_LOCAL_STORE (object);
    CORBA_Environment ev;

    CORBA_exception_init (&ev);
    if (!CORBA_Object_is_nil (local_store->corba_storage, &ev))
        bonobo_object_release_unref (local_store->corba_storage, &ev);
    CORBA_exception_free (&ev);

    if (local_store->local_storage_listener)
        gtk_object_unref (GTK_OBJECT (local_store->local_storage_listener));

    g_hash_table_foreach (local_store->folders, free_folder, NULL);
    g_hash_table_destroy (local_store->folders);

    g_free (local_store->local_path);
}

CamelType
mail_local_store_get_type (void)
{
    static CamelType mail_local_store_type = CAMEL_INVALID_TYPE;

    if (mail_local_store_type == CAMEL_INVALID_TYPE) {
        mail_local_store_type = camel_type_register (
            CAMEL_STORE_TYPE, "MailLocalStore",
            sizeof (MailLocalStore),
            sizeof (MailLocalStoreClass),
            (CamelObjectClassInitFunc) mail_local_store_class_init,
            NULL,
            (CamelObjectInitFunc) mail_local_store_init,
            (CamelObjectFinalizeFunc) mail_local_store_finalize);
    }

    return mail_local_store_type;
}

static CamelFolder *
get_folder (CamelStore *store, const char *folder_name,
        guint32 flags, CamelException *ex)
{
    MailLocalStore *local_store = (MailLocalStore *)store;
    CamelFolder *folder;
    MailLocalFolder *local_folder;
    
    local_folder = g_hash_table_lookup (local_store->folders, folder_name);
    if (local_folder) {
        folder = local_folder->folder;
        camel_object_ref (CAMEL_OBJECT (folder));
    } else {
        folder = NULL;
        camel_exception_setv (ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                      _("No such folder %s"), folder_name);
    }
    
    return folder;
}

static void
trash_add_folder (gpointer key, gpointer value, gpointer data)
{
    MailLocalFolder *local_folder = (MailLocalFolder *) value;
    CamelFolder *folder = local_folder->folder;
    CamelStore *store = CAMEL_STORE (data);
    
    camel_vee_folder_add_folder (CAMEL_VEE_FOLDER (store->vtrash), folder);
}

static void
trash_finalize (CamelObject *trash, gpointer event_data, gpointer user_data)
{
    CamelStore *store = CAMEL_STORE (user_data);
    
    store->vtrash = NULL;
}
                          
static void
init_trash (CamelStore *store)
{
    MailLocalStore *local_store = MAIL_LOCAL_STORE (store);
    
    store->vtrash = camel_vtrash_folder_new (store, CAMEL_VTRASH_NAME);
    
    if (store->vtrash) {
        /* attach to the finalize event of the vtrash */
        camel_object_hook_event (CAMEL_OBJECT (store->vtrash), "finalize",
                     trash_finalize, store);
        
        /* add all the pre-opened folders to the vtrash */
        if (local_store->folders) {
            /* lock? */
            g_hash_table_foreach (local_store->folders, trash_add_folder, store);
            /* unlock? */
        }

        /* would prefer not to special-case this, but... */
        mail_folder_cache_note_folder ("vtrash:file:/", store->vtrash);
        mail_folder_cache_set_update_lstorage ("vtrash:file:/", 
                               local_store->corba_storage,
                               "/Trash");
    }
}

static void
populate_folders (gpointer key, gpointer data, gpointer user_data)
{
    GPtrArray *folders = user_data;
    MailLocalFolder *folder;
    CamelFolderInfo *fi;
    
    folder = data;
    
    fi = g_new0 (CamelFolderInfo, 1);
    fi->full_name = g_strdup (folder->path);
    fi->name = g_strdup (folder->name);
    fi->url = g_strdup (folder->uri);
    fi->unread_message_count = -1;
    
    g_ptr_array_add (folders, fi);
}

static CamelFolderInfo *
get_folder_info (CamelStore *store, const char *top,
         guint32 flags, CamelException *ex)
{
    MailLocalStore *local_store = MAIL_LOCAL_STORE (store);
    CamelFolderInfo *fi = NULL;
    GPtrArray *folders;
    
    folders = g_ptr_array_new ();
    g_hash_table_foreach (local_store->folders, populate_folders, folders);
    
    fi = camel_folder_info_build (folders, top, '/', TRUE);
    g_ptr_array_free (folders, TRUE);
    
    return fi;
}

static void
delete_folder (CamelStore *store, const char *folder_name, CamelException *ex)
{
    /* No-op. The shell local storage deals with this. */
}

static void
rename_folder (CamelStore *store, const char *old, const char *new,
           CamelException *ex)
{
    /* Probable no-op... */
}

static char *
get_name (CamelService *service, gboolean brief)
{
    return g_strdup ("Local mail folders");
}


/* Callbacks for the EvolutionStorageListner signals.  */

static void
local_storage_destroyed_cb (EvolutionStorageListener *storage_listener,
                void *data)
{
    /* FIXME: Dunno how to handle this yet.  */
    g_warning ("%s -- The LocalStorage has gone?!", __FILE__);
}

/* ********************************************************************** */
/* Register folder */

struct _register_msg {
    struct _mail_msg msg;

    MailLocalFolder *local_folder;
};

static char *
register_folder_desc(struct _mail_msg *mm, int done)
{
    struct _register_msg *m = (struct _register_msg *)mm;

    d(printf("returning description for %s\n", m->local_folder->uri));

    return g_strdup_printf(_("Opening '%s'"), m->local_folder->uri);
}

static void
register_folder_register(struct _mail_msg *mm)
{
    struct _register_msg *m = (struct _register_msg *)mm;
    MailLocalFolder *local_folder = m->local_folder;
    char *name, *path = local_folder->uri + 7;
    struct _local_meta *meta;
    CamelStore *store;
    guint32 flags;

    name = g_strdup_printf ("%s/local-metadata.xml", path);
    meta = load_metainfo (name);
    g_free (name);

    camel_operation_register (mm->cancel);
    name = g_strdup_printf ("%s:%s", meta->format, path);
    store = camel_session_get_store (session, name, &mm->ex);
    g_free (name);

    if (!store) {
        free_metainfo (meta);
        camel_operation_unregister (mm->cancel);
        return;
    }

    flags = CAMEL_STORE_FOLDER_CREATE;
    if (meta->indexed)
        flags |= CAMEL_STORE_FOLDER_BODY_INDEX;
    local_folder->folder = camel_store_get_folder (store, meta->name, flags, &mm->ex);

    camel_object_unref (CAMEL_OBJECT (store));
    free_metainfo (meta);

    camel_operation_unregister(mm->cancel);
}

static void
register_folder_registered(struct _mail_msg *mm)
{
    struct _register_msg *m = (struct _register_msg *)mm;
    MailLocalFolder *local_folder = m->local_folder;
    
    if (local_folder->folder) {
        gchar *name;
        
        g_hash_table_insert (local_folder->local_store->folders, local_folder->uri + 8,
                     local_folder);
        /* Remove the circular ref once the local store knows aboutthe folder */
        camel_object_unref ((CamelObject *)local_folder->local_store);
        
        /* add the folder to the vfolder lists FIXME: merge stuff above with this */
        vfolder_register_source(local_folder->folder);
        
        mail_folder_cache_set_update_lstorage (local_folder->uri, 
                               local_folder->local_store->corba_storage,
                               local_folder->path);
        
        name = strrchr (local_folder->path, '/');
        if (name) /* should always be true... */ {
            name += 1; /* skip the slash */
            mail_folder_cache_note_name (local_folder->uri, name);
        }
        
        /* Do this after specifying the name so it isn't 'mbox' */
        mail_folder_cache_note_folder (local_folder->uri, local_folder->folder);
        
        m->local_folder = NULL;
    }
}

static void 
register_folder_free(struct _mail_msg *mm)
{
    struct _register_msg *m = (struct _register_msg *)mm;
    
    if (m->local_folder)
        free_local_folder(m->local_folder);
}

static struct _mail_msg_op register_folder_op = {
    register_folder_desc,
    register_folder_register,
    register_folder_registered,
    register_folder_free,
};

static void
local_storage_new_folder_cb (EvolutionStorageListener *storage_listener,
                 const char *path,
                 const GNOME_Evolution_Folder *folder,
                 void *data)
{
    MailLocalStore *local_store = data;
    MailLocalFolder *local_folder;
    struct _register_msg *m;
    int id;
    
    if (strcmp (folder->type, "mail") != 0 ||
        strncmp (folder->physical_uri, "file://", 7) != 0 ||
        strncmp (folder->physical_uri + 7, local_store->local_path,
             local_store->local_pathlen) != 0)
        return;
    
    local_folder = g_new0 (MailLocalFolder, 1);
    local_folder->name = g_strdup (strrchr (path, '/') + 1);
    local_folder->path = g_strdup (path);
    local_folder->uri = g_strdup (folder->physical_uri);
    local_folder->local_store = local_store;
    camel_object_ref((CamelObject *)local_store);
    
    m = mail_msg_new(&register_folder_op, NULL, sizeof(*m));
    
    m->local_folder = local_folder;
    
    /* run synchronous, the shell expects it (I think) */
    id = m->msg.seq;
    e_thread_put(mail_thread_queued, (EMsg *)m);
    mail_msg_wait(id);
}

static void
local_storage_removed_folder_cb (EvolutionStorageListener *storage_listener,
                 const char *path,
                 void *data)
{
    MailLocalStore *local_store = data;
    MailLocalFolder *local_folder;
    char *physical_path;
    char *tmpname;
    
    physical_path = e_path_to_physical (local_store->local_path, path);
    
    if (strncmp (physical_path, local_store->local_path,
             local_store->local_pathlen) != 0)
        return;
    
    tmpname = strchr (physical_path, '/');
    if (tmpname) {
        while (*tmpname == '/')
            tmpname++;
        local_folder = g_hash_table_lookup (local_store->folders, tmpname);
        camel_object_ref ((CamelObject *)local_store); /* When we go to free_local_folder() the
                                  local_store will be unref'd */
    }
    else
        local_folder = NULL;
    
    if (local_folder) {
        g_hash_table_remove (local_store->folders, tmpname);
        
        free_local_folder (local_folder);
    }
    
    g_free (physical_path);
}

static CamelProvider local_provider = {
    "file", "Local mail", NULL, "mail",
    CAMEL_PROVIDER_IS_STORAGE, CAMEL_URL_NEED_PATH,
    /* ... */
};

/* There's only one "file:" store. */
static guint
non_hash (gconstpointer key)
{
    return 0;
}

static gint
non_equal (gconstpointer a, gconstpointer b)
{
    return TRUE;
}

void
mail_local_storage_startup (EvolutionShellClient *shellclient,
                const char *evolution_path)
{
    EvolutionStorageListener *local_storage_listener;
    GNOME_Evolution_StorageListener corba_local_storage_listener;
    CORBA_Environment ev;

    /* Register with Camel to handle file: URLs */
    local_provider.object_types[CAMEL_PROVIDER_STORE] =
        mail_local_store_get_type();

    local_provider.service_cache = g_hash_table_new (non_hash, non_equal);
    camel_session_register_provider (session, &local_provider);


    /* Now build the storage. */
    local_store = (MailLocalStore *)camel_session_get_service (
        session, "file:/", CAMEL_PROVIDER_STORE, NULL);
    if (!local_store) {
        g_warning ("No local store!");
        return;
    }

    local_store->corba_storage = evolution_shell_client_get_local_storage (shellclient);
    if (local_store->corba_storage == CORBA_OBJECT_NIL) {
        g_warning ("No local storage!");
        camel_object_unref (CAMEL_OBJECT (local_store));
        return;
    }
    
    local_storage_listener = evolution_storage_listener_new ();
    corba_local_storage_listener = evolution_storage_listener_corba_objref (
        local_storage_listener);

    gtk_signal_connect (GTK_OBJECT (local_storage_listener),
                "destroyed",
                GTK_SIGNAL_FUNC (local_storage_destroyed_cb),
                local_store);
    gtk_signal_connect (GTK_OBJECT (local_storage_listener),
                "new_folder",
                GTK_SIGNAL_FUNC (local_storage_new_folder_cb),
                local_store);
    gtk_signal_connect (GTK_OBJECT (local_storage_listener),
                "removed_folder",
                GTK_SIGNAL_FUNC (local_storage_removed_folder_cb),
                local_store);

    local_store->local_storage_listener = local_storage_listener;

    local_store->local_path = g_strdup_printf ("%s/local",
                           evolution_path);
    local_store->local_pathlen = strlen (local_store->local_path);

    local_store->folders = g_hash_table_new (g_str_hash, g_str_equal);

    CORBA_exception_init (&ev);
    GNOME_Evolution_Storage_addListener (local_store->corba_storage,
                         corba_local_storage_listener, &ev);
    if (ev._major != CORBA_NO_EXCEPTION) {
        g_warning ("Cannot add a listener to the Local Storage.");
        camel_object_unref (CAMEL_OBJECT (local_store));
        CORBA_exception_free (&ev);
        return;
    }
    CORBA_exception_free (&ev);
}


/*----------------------------------------------------------------------
 * Local folder reconfiguration stuff
 *----------------------------------------------------------------------*/

/*
   open new
   copy old->new
   close old
   rename old oldsave
   rename new old
   open oldsave
   delete oldsave

   close old
   rename oldtmp
   open new
   open oldtmp
   copy oldtmp new
   close oldtmp
   close oldnew

*/

/* ******************** */

/* we should have our own progress bar for this */

struct _reconfigure_msg {
    struct _mail_msg msg;

    FolderBrowser *fb;
    char *newtype;
    GtkWidget *frame;
    GtkWidget *apply;
    GtkWidget *cancel;
    GtkOptionMenu *optionlist;
};

static char *
reconfigure_folder_describe(struct _mail_msg *mm, int done)
{
    struct _reconfigure_msg *m = (struct _reconfigure_msg *)mm;

    return g_strdup_printf (_("Changing folder \"%s\" to \"%s\" format"),
                m->fb->uri,
                m->newtype);
}

static void
reconfigure_folder_reconfigure(struct _mail_msg *mm)
{
    struct _reconfigure_msg *m = (struct _reconfigure_msg *)mm;
    MailLocalFolder *local_folder = NULL;
    CamelStore *fromstore = NULL, *tostore = NULL;
    char *fromurl = NULL, *tourl = NULL;
    CamelFolder *fromfolder = NULL, *tofolder = NULL;
    GPtrArray *uids;
    char *metapath;
    char *tmpname;
    CamelURL *url = NULL;
    struct _local_meta *meta = NULL;
    guint32 flags;

    d(printf("reconfiguring folder: %s to type %s\n", m->fb->uri, m->newtype));

    /* NOTE: This var is cleared by the folder_browser via the set_uri method */
    m->fb->reconfigure = TRUE;

    /* get the actual location of the mailbox */
    url = camel_url_new(m->fb->uri, &mm->ex);
    if (camel_exception_is_set(&mm->ex)) {
        g_warning("%s is not a workable url!", m->fb->uri);
        goto cleanup;
    }

    tmpname = strchr (m->fb->uri, '/');
    if (tmpname) {
        while (*tmpname == '/')
            tmpname++;
        local_folder = g_hash_table_lookup (local_store->folders, tmpname);
    } else
        local_folder = NULL;
    if (!local_folder) {
        g_warning("%s is not a registered local folder!", m->fb->uri);
        goto cleanup;
    }

    metapath = g_strdup_printf("%s/local-metadata.xml", url->path);
    meta = load_metainfo(metapath);
    g_free(metapath);

    /* first, 'close' the old folder */
    camel_folder_sync(local_folder->folder, FALSE, &mm->ex);

    /* Once for the FolderBrowser, once for the local store */
    camel_object_unref(CAMEL_OBJECT(local_folder->folder));
    camel_object_unref(CAMEL_OBJECT(local_folder->folder));
    local_folder->folder = m->fb->folder = NULL;

    camel_url_set_protocol (url, meta->format);
    fromurl = camel_url_to_string (url, CAMEL_URL_HIDE_PASSWORD | CAMEL_URL_HIDE_PARAMS);
    camel_url_set_protocol (url, m->newtype);
    tourl = camel_url_to_string (url, CAMEL_URL_HIDE_PASSWORD | CAMEL_URL_HIDE_PARAMS);

    d(printf("opening stores %s and %s\n", fromurl, tourl));

    fromstore = camel_session_get_store(session, fromurl, &mm->ex);

    if (camel_exception_is_set(&mm->ex))
        goto cleanup;

    tostore = camel_session_get_store(session, tourl, &mm->ex);
    if (camel_exception_is_set(&mm->ex))
        goto cleanup;

    /* rename the old mbox and open it again, without indexing */
    tmpname = g_strdup_printf("%s_reconfig", meta->name);
    d(printf("renaming %s to %s, and opening it\n", meta->name, tmpname));

    camel_store_rename_folder(fromstore, meta->name, tmpname, &mm->ex);
    if (camel_exception_is_set(&mm->ex)) {
        goto cleanup;
    }
    
    /* we dont need to set the create flag ... or need an index if it has one */
    fromfolder = camel_store_get_folder(fromstore, tmpname, 0, &mm->ex);
    if (fromfolder == NULL || camel_exception_is_set(&mm->ex)) {
        /* try and recover ... */
        camel_exception_clear (&mm->ex);
        camel_store_rename_folder(fromstore, tmpname, meta->name, &mm->ex);
        goto cleanup;
    }

    /* create a new mbox */
    d(printf("Creating the destination mbox\n"));

    flags = CAMEL_STORE_FOLDER_CREATE;
    if (meta->indexed)
        flags |= CAMEL_STORE_FOLDER_BODY_INDEX;
    tofolder = camel_store_get_folder(tostore, meta->name, flags, &mm->ex);
    if (tofolder == NULL || camel_exception_is_set(&mm->ex)) {
        d(printf("cannot open destination folder\n"));
        /* try and recover ... */
        camel_exception_clear (&mm->ex);
        camel_store_rename_folder(fromstore, tmpname, meta->name, &mm->ex);
        goto cleanup;
    }

    uids = camel_folder_get_uids (fromfolder);
    camel_folder_move_messages_to (fromfolder, uids, tofolder, &mm->ex);
    camel_folder_free_uids (fromfolder, uids);
    if (camel_exception_is_set(&mm->ex))
        goto cleanup;
    
    camel_folder_expunge (fromfolder, &mm->ex);

    d(printf("delete old mbox ...\n"));
    camel_store_delete_folder(fromstore, tmpname, &mm->ex);

    /* switch format */
    g_free(meta->format);
    meta->format = g_strdup(m->newtype);
    if (save_metainfo(meta) == -1) {
        camel_exception_setv (&mm->ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Cannot save folder metainfo; "
                    "you'll probably find you can't\n"
                    "open this folder anymore: %s"),
                      tourl);
    }

 cleanup:
    if (local_folder && !local_folder->folder) {
        struct _register_msg *rm = mail_msg_new(&register_folder_op, NULL, sizeof(*m));

        /* fake the internal part of this operation, nasty hackish thing */
        rm->local_folder = local_folder;
        register_folder_register((struct _mail_msg *)rm);
        rm->local_folder = NULL;
        mail_msg_free((struct _mail_msg *)rm);
    }
    if (tofolder)
        camel_object_unref (CAMEL_OBJECT (tofolder));
    if (fromfolder)
        camel_object_unref (CAMEL_OBJECT (fromfolder));
    if (fromstore)
        camel_object_unref (CAMEL_OBJECT (fromstore));
    if (tostore)
        camel_object_unref (CAMEL_OBJECT (tostore));
    if (meta)
        free_metainfo(meta);
    g_free(fromurl);
    g_free(tourl);
    if (url)
        camel_url_free (url);
}

static void
reconfigure_folder_reconfigured(struct _mail_msg *mm)
{
    struct _reconfigure_msg *m = (struct _reconfigure_msg *)mm;
    char *uri;

    if (camel_exception_is_set(&mm->ex)) {
        gnome_error_dialog (_("If you can no longer open this mailbox, then\n"
                      "you may need to repair it manually."));
    }

    /* force a reload of the newly formatted folder */
    d(printf("opening new source\n"));
    uri = g_strdup(m->fb->uri);
    folder_browser_set_uri(m->fb, uri);
    g_free(uri);
}

static void
reconfigure_folder_free(struct _mail_msg *mm)
{
    struct _reconfigure_msg *m = (struct _reconfigure_msg *)mm;

    gtk_object_unref (GTK_OBJECT (m->fb));
    g_free (m->newtype);
}

static struct _mail_msg_op reconfigure_folder_op = {
    reconfigure_folder_describe,
    reconfigure_folder_reconfigure,
    reconfigure_folder_reconfigured,
    reconfigure_folder_free,
};

/* hash table of folders that the user has a reconfig-folder dialog for */
static GHashTable *reconfigure_folder_hash = NULL;

static void
reconfigure_clicked (GnomeDialog *dialog, int button, struct _reconfigure_msg *m)
{
    if (button == 0) {
        GtkWidget *menu;
        int type;
        char *types[] = { "mbox", "maildir", "mh" };
        
        /* hack to clear the message list during update */
        message_list_set_folder (m->fb->message_list, NULL, FALSE);
        
        menu = gtk_option_menu_get_menu (m->optionlist);
        type = g_list_index (GTK_MENU_SHELL (menu)->children,
                     gtk_menu_get_active (GTK_MENU (menu)));
        if (type < 0 || type > 2)
            type = 0;
        
        gtk_widget_set_sensitive (m->frame, FALSE);
        gtk_widget_set_sensitive (m->apply, FALSE);
        gtk_widget_set_sensitive (m->cancel, FALSE);
        
        m->newtype = g_strdup (types[type]);
        e_thread_put (mail_thread_queued, (EMsg *)m);
    } else
        mail_msg_free ((struct _mail_msg *)m);
    
    if (button != -1)
        gnome_dialog_close (dialog);
}

void
mail_local_reconfigure_folder (FolderBrowser *fb)
{
    CamelStore *store;
    GladeXML *gui;
    GnomeDialog *gd;
    struct _reconfigure_msg *m;
    char *name, *title;
    
    if (fb->folder == NULL) {
        g_warning ("Trying to reconfigure nonexistant folder");
        return;
    }
    
    if (!reconfigure_folder_hash)
        reconfigure_folder_hash = g_hash_table_new (g_direct_hash, g_direct_equal);
    
    if ((gd = g_hash_table_lookup (reconfigure_folder_hash, fb->folder))) {
        gdk_window_raise (GTK_WIDGET (gd)->window);
        return;
    }

    /* check if we can work on this folder */
    name = strchr (fb->uri, '/');
    if (name) {
        while (*name == '/')
            name++;
        /* we just want to see if it's NULL or not */
        name = (char *) g_hash_table_lookup (local_store->folders, name);
    }

    if (name == NULL) {
        e_notice (NULL, GNOME_MESSAGE_BOX_WARNING,
              _("You cannot change the format of a non-local folder."));
        return;
    }

    m = mail_msg_new (&reconfigure_folder_op, NULL, sizeof (*m));
    store = camel_folder_get_parent_store (fb->folder);
    
    gui = glade_xml_new (EVOLUTION_GLADEDIR "/local-config.glade", "dialog_format");
    gd = (GnomeDialog *)glade_xml_get_widget (gui, "dialog_format");
    
    name = mail_tool_get_folder_name (fb->folder);
    title = g_strdup_printf (_("Reconfigure %s"), name);
    gtk_window_set_title (GTK_WINDOW (gd), title);
    g_free (title);
    g_free (name);
    
    m->frame = glade_xml_get_widget (gui, "frame_format");
    m->apply = glade_xml_get_widget (gui, "apply_format");
    m->cancel = glade_xml_get_widget (gui, "cancel_format");
    m->optionlist = (GtkOptionMenu *)glade_xml_get_widget (gui, "option_format");
    m->newtype = NULL;
    m->fb = fb;
    gtk_object_ref (GTK_OBJECT (fb));
    
    gtk_label_set_text ((GtkLabel *)glade_xml_get_widget (gui, "label_format"),
                ((CamelService *)store)->url->protocol);
    
    gtk_signal_connect (GTK_OBJECT (gd), "clicked", reconfigure_clicked, m);
    gtk_object_unref (GTK_OBJECT (gui));
    
    g_hash_table_insert (reconfigure_folder_hash, (gpointer) fb->folder, (gpointer) gd);
    
    gnome_dialog_run_and_close (GNOME_DIALOG (gd));
    
    /* remove this folder from our hash since we are done with it */
    g_hash_table_remove (reconfigure_folder_hash, fb->folder);
    if (g_hash_table_size (reconfigure_folder_hash) == 0) {
        /* additional cleanup */
        g_hash_table_destroy (reconfigure_folder_hash);
        reconfigure_folder_hash = NULL;
    }
}