path: root/mail/mail-vfolder.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Michael Zucchi <notzed@ximian.com>
 *
 *  Copyright 2000-2003 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 Street #330, Boston, MA 02111-1307, USA.
 *
 */

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

#include <glib.h>
#include <string.h>
#include <libgnome/gnome-i18n.h>

#include "Evolution.h"

#include "evolution-shell-component.h"
#include "mail-component.h"
#include "mail-vfolder.h"
#include "mail-tools.h"
#include "mail-autofilter.h"
#include "mail-folder-cache.h"
#include "mail.h"
#include "mail-ops.h"
#include "mail-mt.h"

#include "e-util/e-dialog-utils.h"

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

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

#define d(x) /*(printf("%s(%d):%s: ",  __FILE__, __LINE__, __PRETTY_FUNCTION__), (x))*/

static VfolderContext *context; /* context remains open all time */
static CamelStore *vfolder_store; /* the 1 static vfolder store */

/* lock for accessing shared resources (below) */
static pthread_mutex_t vfolder_lock = PTHREAD_MUTEX_INITIALIZER;

static GList *source_folders_remote;    /* list of source folder uri's - remote ones */
static GList *source_folders_local; /* list of source folder uri's - local ones */
static GHashTable *vfolder_hash;

extern EvolutionShellClient *global_shell_client;

/* more globals ... */
extern CamelSession *session;

static void rule_changed(FilterRule *rule, CamelFolder *folder);

#define LOCK() pthread_mutex_lock(&vfolder_lock);
#define UNLOCK() pthread_mutex_unlock(&vfolder_lock);

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

struct _setup_msg {
    struct _mail_msg msg;

    CamelFolder *folder;
    char *query;
    GList *sources_uri;
    GList *sources_folder;
};

static char *
vfolder_setup_desc(struct _mail_msg *mm, int done)
{
    struct _setup_msg *m = (struct _setup_msg *)mm;

    return g_strdup_printf(_("Setting up vfolder: %s"), m->folder->full_name);
}

static void
vfolder_setup_do(struct _mail_msg *mm)
{
    struct _setup_msg *m = (struct _setup_msg *)mm;
    GList *l, *list = NULL;
    CamelFolder *folder;

    d(printf("Setting up vfolder: %s\n", m->folder->full_name));

    camel_vee_folder_set_expression((CamelVeeFolder *)m->folder, m->query);

    l = m->sources_uri;
    while (l) {
        d(printf(" Adding uri: %s\n", (char *)l->data));
        folder = mail_tool_uri_to_folder (l->data, 0, &mm->ex);
        if (folder) {
            list = g_list_append(list, folder);
        } else {
            g_warning("Could not open vfolder source: %s", (char *)l->data);
            camel_exception_clear(&mm->ex);
        }
        l = l->next;
    }

    l = m->sources_folder;
    while (l) {
        d(printf(" Adding folder: %s\n", ((CamelFolder *)l->data)->full_name));
        camel_object_ref(l->data);
        list = g_list_append(list, l->data);
        l = l->next;
    }

    camel_vee_folder_set_folders((CamelVeeFolder *)m->folder, list);

    l = list;
    while (l) {
        camel_object_unref(l->data);
        l = l->next;
    }
    g_list_free(list);
}

static void
vfolder_setup_done(struct _mail_msg *mm)
{
    struct _setup_msg *m = (struct _setup_msg *)mm;

    m = m;
}

static void
vfolder_setup_free (struct _mail_msg *mm)
{
    struct _setup_msg *m = (struct _setup_msg *)mm;
    GList *l;

    camel_object_unref(m->folder);
    g_free(m->query);

    l = m->sources_uri;
    while (l) {
        g_free(l->data);
        l = l->next;
    }
    g_list_free(m->sources_uri);

    l = m->sources_folder;
    while (l) {
        camel_object_unref(l->data);
        l = l->next;
    }
    g_list_free(m->sources_folder);
}

static struct _mail_msg_op vfolder_setup_op = {
    vfolder_setup_desc,
    vfolder_setup_do,
    vfolder_setup_done,
    vfolder_setup_free,
};

static int
vfolder_setup(CamelFolder *folder, const char *query, GList *sources_uri, GList *sources_folder)
{
    struct _setup_msg *m;
    int id;
    
    m = mail_msg_new(&vfolder_setup_op, NULL, sizeof (*m));
    m->folder = folder;
    camel_object_ref(folder);
    m->query = g_strdup(query);
    m->sources_uri = sources_uri;
    m->sources_folder = sources_folder;
    
    id = m->msg.seq;
    e_thread_put(mail_thread_queued_slow, (EMsg *)m);

    return id;
}

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

struct _adduri_msg {
    struct _mail_msg msg;

    char *uri;
    GList *folders;
    int remove;
};

static char *
vfolder_adduri_desc(struct _mail_msg *mm, int done)
{
    struct _adduri_msg *m = (struct _adduri_msg *)mm;

    return g_strdup_printf(_("Updating vfolders for uri: %s"), m->uri);
}

static void
vfolder_adduri_do(struct _mail_msg *mm)
{
    struct _adduri_msg *m = (struct _adduri_msg *)mm;
    GList *l;
    CamelFolder *folder = NULL;

    d(printf("%s uri to vfolder: %s\n", m->remove?"Removing":"Adding", m->uri));

    /* we dont try lookup the cache if we are removing it, its no longer there */
    if (!m->remove && !mail_note_get_folder_from_uri(m->uri, &folder)) {
        g_warning("Folder '%s' disappeared while I was adding/remove it to/from my vfolder", m->uri);
        return;
    }

    if (folder == NULL)
        folder = mail_tool_uri_to_folder (m->uri, 0, &mm->ex);

    if (folder != NULL) {
        l = m->folders;
        while (l) {
            if (m->remove)
                camel_vee_folder_remove_folder((CamelVeeFolder *)l->data, folder);
            else
                camel_vee_folder_add_folder((CamelVeeFolder *)l->data, folder);
            l = l->next;
        }
        camel_object_unref(folder);
    }
}

static void
vfolder_adduri_done(struct _mail_msg *mm)
{
    struct _adduri_msg *m = (struct _adduri_msg *)mm;

    m = m;
}

static void
vfolder_adduri_free (struct _mail_msg *mm)
{
    struct _adduri_msg *m = (struct _adduri_msg *)mm;

    g_list_foreach(m->folders, (GFunc)camel_object_unref, NULL);
    g_list_free(m->folders);
    g_free(m->uri);
}

static struct _mail_msg_op vfolder_adduri_op = {
    vfolder_adduri_desc,
    vfolder_adduri_do,
    vfolder_adduri_done,
    vfolder_adduri_free,
};

static int
vfolder_adduri(const char *uri, GList *folders, int remove)
{
    struct _adduri_msg *m;
    int id;
    
    m = mail_msg_new(&vfolder_adduri_op, NULL, sizeof (*m));
    m->folders = folders;
    m->uri = g_strdup(uri);
    m->remove = remove;
    
    id = m->msg.seq;
    e_thread_put(mail_thread_queued_slow, (EMsg *)m);

    return id;
}

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

/* So, uh, apparently g_list_find_custom expect the compare func to return 0 to mean true? */
static GList *
my_list_find(GList *l, const char *uri, GCompareFunc cmp)
{
    while (l) {
        if (cmp(l->data, uri))
            break;
        l = l->next;
    }
    return l;
}

static int
uri_is_ignore(const char *uri, GCompareFunc uri_cmp)
{
    extern char *default_outbox_folder_uri, *default_sent_folder_uri, *default_drafts_folder_uri;
    EAccountList *accounts;
    EAccount *account;
    EIterator *iter;
    int found = FALSE;
    
    d(printf("checking '%s' against:\n  %s\n  %s\n  %s\n", uri, default_outbox_folder_uri, default_sent_folder_uri, default_drafts_folder_uri));
    
    found = (default_outbox_folder_uri && uri_cmp(default_outbox_folder_uri, uri))
        || (default_sent_folder_uri && uri_cmp(default_sent_folder_uri, uri))
        || (default_drafts_folder_uri && uri_cmp(default_drafts_folder_uri, uri));
    
    accounts = mail_config_get_accounts ();
    iter = e_list_get_iterator ((EList *) accounts);
    while (e_iterator_is_valid (iter)) {
        account = (EAccount *) e_iterator_get (iter);
        
        d(printf("checking sent_folder_uri '%s' == '%s'\n",
             account->sent_folder_uri ? account->sent_folder_uri : "empty", uri));
        
        found = (account->sent_folder_uri && uri_cmp (account->sent_folder_uri, uri))
            || (account->drafts_folder_uri && uri_cmp (account->drafts_folder_uri, uri));
        
        if (found)
            break;
        
        e_iterator_next (iter);
    }
    
    g_object_unref (iter);
    
    return found;
}

/* called when a new uri becomes (un)available */
void
mail_vfolder_add_uri(CamelStore *store, const char *uri, int remove)
{
    FilterRule *rule;
    const char *source;
    CamelVeeFolder *vf;
    GList *folders = NULL, *link;
    int remote = (((CamelService *)store)->provider->flags & CAMEL_PROVIDER_IS_REMOTE) != 0;
    GCompareFunc uri_cmp = CAMEL_STORE_CLASS(CAMEL_OBJECT_GET_CLASS(store))->compare_folder_name;
    int is_ignore;

    if (CAMEL_IS_VEE_STORE(store) || !strncmp(uri, "vtrash:", 7) || !strncmp(uri, "vjunk:", 6) || context == NULL)
        return;

    g_assert(pthread_self() == mail_gui_thread);

    is_ignore = uri_is_ignore(uri, uri_cmp);

    LOCK();

    d(printf("%s uri to check: %s\n", remove?"Removing":"Adding", uri));

    /* maintain the source folders lists for changed rules later on */
    if (remove) {
        if (remote) {
            if ((link = my_list_find(source_folders_remote, (void *)uri, uri_cmp)) != NULL) {
                g_free(link->data);
                source_folders_remote = g_list_remove_link(source_folders_remote, link);
            }
        } else {
            if ((link = my_list_find(source_folders_local, (void *)uri, uri_cmp)) != NULL) {
                g_free(link->data);
                source_folders_local = g_list_remove_link(source_folders_local, link);
            }
        }
    } else if (!is_ignore) {
        /* we ignore drafts/sent/outbox here */
        if (remote) {
            if (my_list_find(source_folders_remote, (void *)uri, uri_cmp) == NULL)
                source_folders_remote = g_list_prepend(source_folders_remote, g_strdup(uri));
        } else {
            if (my_list_find(source_folders_local, (void *)uri, uri_cmp) == NULL)
                source_folders_local = g_list_prepend(source_folders_local, g_strdup(uri));
        }
    }

    rule = NULL;
    while ((rule = rule_context_next_rule((RuleContext *)context, rule, NULL))) {
        int found = FALSE;
        
        if (!rule->name) {
            d(printf("invalid rule (%p): rule->name is set to NULL\n", rule));
            continue;
        }

        /* dont auto-add any sent/drafts folders etc, they must be explictly listed as a source */
        if (rule->source
            && !is_ignore
            && ((!strcmp(rule->source, "local") && !remote)
            || (!strcmp(rule->source, "remote_active") && remote)
            || (!strcmp(rule->source, "local_remote_active"))))
            found = TRUE;
        
        /* we check using the store uri_cmp since its more accurate */
        source = NULL;
        while (!found && (source = vfolder_rule_next_source((VfolderRule *)rule, source)))
            found = uri_cmp(uri, source);
        
        if (found) {
            vf = g_hash_table_lookup(vfolder_hash, rule->name);
            g_assert(vf);
            camel_object_ref(vf);
            folders = g_list_prepend(folders, vf);
        }
    }
    
    UNLOCK();
    
    if (folders != NULL)
        vfolder_adduri(uri, folders, remove);
}

/* called when a uri is deleted from a store */
void
mail_vfolder_delete_uri(CamelStore *store, const char *uri)
{
    GCompareFunc uri_cmp = CAMEL_STORE_CLASS(CAMEL_OBJECT_GET_CLASS(store))->compare_folder_name;
    FilterRule *rule;
    const char *source;
    CamelVeeFolder *vf;
    GString *changed;

    if (context == NULL || !strncmp(uri, "vtrash:", 7) || !strncmp(uri, "vjunk:", 6))
        return;
    
    d(printf ("Deleting uri to check: %s\n", uri));
    
    g_assert (pthread_self() == mail_gui_thread);
    
    changed = g_string_new ("");
    
    LOCK();
    
    /* see if any rules directly reference this removed uri */
    rule = NULL;
    while ((rule = rule_context_next_rule ((RuleContext *) context, rule, NULL))) {
        source = NULL;
        while ((source = vfolder_rule_next_source ((VfolderRule *) rule, source))) {
            /* Remove all sources that match, ignore changed events though
               because the adduri call above does the work async */
            if (uri_cmp (uri, source)) {
                vf = g_hash_table_lookup (vfolder_hash, rule->name);
                g_assert (vf != NULL);
                g_signal_handlers_disconnect_matched (rule, G_SIGNAL_MATCH_FUNC|G_SIGNAL_MATCH_DATA, 0,
                                      0, NULL, rule_changed, vf);
                vfolder_rule_remove_source ((VfolderRule *)rule, source);
                g_signal_connect (rule, "changed", G_CALLBACK(rule_changed), vf);
                g_string_append_printf (changed, "    %s\n", rule->name);
                source = NULL;
            }
        }
    }
    
    UNLOCK();
    
    if (changed->str[0]) {
        GtkWidget *dialog;
        char *user;
        
        dialog = gtk_message_dialog_new (NULL, 0, GTK_MESSAGE_INFO, GTK_BUTTONS_OK,
                         _("The following vFolder(s):\n%s"
                           "Used the removed folder:\n    '%s'\n"
                           "And have been updated."),
                         changed->str, uri);
        g_signal_connect_swapped (dialog, "response", G_CALLBACK (gtk_widget_destroy), dialog);
        gtk_widget_show (dialog);
        
        user = g_strdup_printf ("%s/mail/vfolders.xml",
                    mail_component_peek_base_directory (mail_component_peek ()));
        rule_context_save ((RuleContext *) context, user);
        g_free (user);
    }
    
    g_string_free (changed, TRUE);
}

/* called when a uri is renamed in a store */
void
mail_vfolder_rename_uri(CamelStore *store, const char *from, const char *to)
{
    GCompareFunc uri_cmp = CAMEL_STORE_CLASS(CAMEL_OBJECT_GET_CLASS(store))->compare_folder_name;
    FilterRule *rule;
    const char *source;
    CamelVeeFolder *vf;
    int changed = 0;

    d(printf("vfolder rename uri: %s to %s\n", from, to));

    if (context == NULL || !strncmp(from, "vtrash:", 7) || !strncmp(to, "vtrash:", 7) || !strncmp(from, "vjunk:", 6) || !strncmp(to, "vjunk:", 6))
        return;

    g_assert(pthread_self() == mail_gui_thread);

    LOCK();

    /* see if any rules directly reference this removed uri */
    rule = NULL;
    while ( (rule = rule_context_next_rule((RuleContext *)context, rule, NULL)) ) {
        source = NULL;
        while ( (source = vfolder_rule_next_source((VfolderRule *)rule, source)) ) {
            /* Remove all sources that match, ignore changed events though
               because the adduri call above does the work async */
            if (uri_cmp(from, source)) {
                d(printf("Vfolder '%s' used '%s' ('%s') now uses '%s'\n", rule->name, source, from, to));
                vf = g_hash_table_lookup(vfolder_hash, rule->name);
                g_assert(vf);
                g_signal_handlers_disconnect_matched(rule, G_SIGNAL_MATCH_FUNC|G_SIGNAL_MATCH_DATA, 0,
                                     0, NULL, rule_changed, vf);
                vfolder_rule_remove_source((VfolderRule *)rule, source);
                vfolder_rule_add_source((VfolderRule *)rule, to);
                g_signal_connect(rule, "changed", G_CALLBACK(rule_changed), vf);
                changed++;
                source = NULL;
            }
        }
    }

    UNLOCK();

    if (changed) {
        char *user;

        d(printf("Vfolders updated from renamed folder\n"));
        user = g_strdup_printf("%s/mail/vfolders.xml", mail_component_peek_base_directory (mail_component_peek ()));
        rule_context_save((RuleContext *)context, user);
        g_free(user);
    }
}

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

static void context_rule_added(RuleContext *ctx, FilterRule *rule);

static void
rule_changed(FilterRule *rule, CamelFolder *folder)
{
    const char *sourceuri;
    GList *l;
    GList *sources_uri = NULL, *sources_folder = NULL;
    GString *query;
    int i;
    CamelFolder *newfolder;

    /* if the folder has changed name, then add it, then remove the old manually */
    if (strcmp(folder->full_name, rule->name) != 0) {
        char *key, *oldname;
        CamelFolder *old;

        LOCK();
        d(printf("Changing folder name in hash table to '%s'\n", rule->name));
        if (g_hash_table_lookup_extended(vfolder_hash, folder->full_name, (void **)&key, (void **)&old)) {
            g_hash_table_remove(vfolder_hash, key);
            g_free(key);
            g_hash_table_insert(vfolder_hash, g_strdup(rule->name), folder);
            UNLOCK();
        } else {
            UNLOCK();
            g_warning("couldn't find a vfolder rule in our table? %s", folder->full_name);
        }

        /* TODO: make the folder->full_name var thread accessible */
        oldname = g_strdup(folder->full_name);
        camel_store_rename_folder(vfolder_store, oldname, rule->name, NULL);
        g_free(oldname);
    }

    d(printf("Filter rule changed? for folder '%s'!!\n", folder->name));

    /* find any (currently available) folders, and add them to the ones to open */
    sourceuri = NULL;
    while ( (sourceuri = vfolder_rule_next_source((VfolderRule *)rule, sourceuri)) ) {
        if (mail_note_get_folder_from_uri(sourceuri, &newfolder)) {
            if (newfolder)
                sources_folder = g_list_append(sources_folder, newfolder);
            else
                sources_uri = g_list_append(sources_uri, g_strdup(sourceuri));
        }
    }

    /* check the remote/local uri lists for any other uri's that should be looked at */
    if (rule->source) {
        LOCK();
        for (i=0;i<2;i++) {
            if (i==0 && (!strcmp(rule->source, "local") || !strcmp(rule->source, "local_remote_active")))
                l = source_folders_local;
            else if (i==1 && (!strcmp(rule->source, "remote_active") || !strcmp(rule->source, "local_remote_active")))
                l = source_folders_remote;
            else
                l = NULL;

            while (l) {
                if (mail_note_get_folder_from_uri(l->data, &newfolder)) {
                    if (newfolder)
                        sources_folder = g_list_append(sources_folder, newfolder);
                    else
                        sources_uri = g_list_append(sources_uri, g_strdup(l->data));
                } else {
                    d(printf("  -> No such folder?\n"));
                }
                l = l->next;
            }
        }
        UNLOCK();
    }

    query = g_string_new("");
    filter_rule_build_code(rule, query);

    vfolder_setup(folder, query->str, sources_uri, sources_folder);

    g_string_free(query, TRUE);
}

static void context_rule_added(RuleContext *ctx, FilterRule *rule)
{
    CamelFolder *folder;

    d(printf("rule added: %s\n", rule->name));

    /* this always runs quickly */
    folder = camel_store_get_folder(vfolder_store, rule->name, 0, NULL);
    if (folder) {
        g_signal_connect(rule, "changed", G_CALLBACK(rule_changed), folder);

        LOCK();
        g_hash_table_insert(vfolder_hash, g_strdup(rule->name), folder);
        UNLOCK();

        mail_note_folder(folder);
        rule_changed(rule, folder);
    }
}

static void context_rule_removed(RuleContext *ctx, FilterRule *rule)
{
    char *key, *path;
    CamelFolder *folder = NULL;

    d(printf("rule removed; %s\n", rule->name));

    /* TODO: remove from folder info cache? */
    
    /* FIXME: is this even necessary? if we remove the folder from
     * the CamelStore, the tree should pick it up auto-magically
     * because it listens to CamelStore events... */
    path = g_strdup_printf("/%s", rule->name);
    mail_component_remove_folder (mail_component_peek (), vfolder_store, path);
    g_free(path);
    
    LOCK();
    if (g_hash_table_lookup_extended(vfolder_hash, rule->name, (void **)&key, (void **)&folder)) {
        g_hash_table_remove(vfolder_hash, key);
        g_free(key);
    }
    UNLOCK();

    camel_store_delete_folder(vfolder_store, rule->name, NULL);
    /* this must be unref'd after its deleted */
    if (folder)
        camel_object_unref(folder);
}

static void
store_folder_created(CamelObject *o, void *event_data, void *data)
{
    CamelStore *store = (CamelStore *)o;
    CamelFolderInfo *info = event_data;

    store = store;
    info = info;
}

static void
store_folder_deleted(CamelObject *o, void *event_data, void *data)
{
    CamelStore *store = (CamelStore *)o;
    CamelFolderInfo *info = event_data;
    FilterRule *rule;
    char *user;

    d(printf("Folder deleted: %s\n", info->name));
    store = store;

    /* Warning not thread safe, but might be enough */

    LOCK();

    /* delete it from our list */
    rule = rule_context_find_rule((RuleContext *)context, info->full_name, NULL);
    if (rule) {
        /* We need to stop listening to removed events, otherwise we'll try and remove it again */
        g_signal_handlers_disconnect_matched(context, G_SIGNAL_MATCH_FUNC|G_SIGNAL_MATCH_DATA, 0,
                             0, NULL, context_rule_removed, context);
        rule_context_remove_rule((RuleContext *)context, rule);
        g_object_unref(rule);
        g_signal_connect(context, "rule_removed", G_CALLBACK(context_rule_removed), context);
        
        user = g_strdup_printf("%s/mail/vfolders.xml", mail_component_peek_base_directory (mail_component_peek ()));
        rule_context_save((RuleContext *)context, user);
        g_free(user);
    } else {
        g_warning("Cannot find rule for deleted vfolder '%s'", info->name);
    }

    UNLOCK();
}

static void
store_folder_renamed(CamelObject *o, void *event_data, void *data)
{
    CamelStore *store = (CamelStore *)o;
    CamelRenameInfo *info = event_data;
    FilterRule *rule;
    char *user;
    char *key;
    CamelFolder *folder;
    
    /* This should be more-or-less thread-safe */

    d(printf("Folder renamed to '%s' from '%s'\n", info->new->full_name, info->old_base));

    /* Folder is already renamed? */
    LOCK();
    d(printf("Changing folder name in hash table to '%s'\n", info->new->full_name));
    if (g_hash_table_lookup_extended(vfolder_hash, info->old_base, (void **)&key, (void **)&folder)) {
        g_hash_table_remove(vfolder_hash, key);
        g_free(key);
        g_hash_table_insert(vfolder_hash, g_strdup(info->new->full_name), folder);

        rule = rule_context_find_rule((RuleContext *)context, info->old_base, NULL);
        g_assert(rule);
        g_signal_handlers_disconnect_matched(rule, G_SIGNAL_MATCH_FUNC|G_SIGNAL_MATCH_DATA, 0,
                             0, NULL, rule_changed, folder);
        filter_rule_set_name(rule, info->new->full_name);
        g_signal_connect(rule, "changed", G_CALLBACK(rule_changed), folder);

        user = g_strdup_printf("%s/mail/vfolders.xml", mail_component_peek_base_directory (mail_component_peek ()));
        rule_context_save((RuleContext *)context, user);
        g_free(user);

        UNLOCK();
    } else {
        UNLOCK();
        g_warning("couldn't find a vfolder rule in our table? %s", info->new->full_name);
    }
}

void
vfolder_load_storage(void)
{
    char *user, *storeuri;
    FilterRule *rule;

    vfolder_hash = g_hash_table_new(g_str_hash, g_str_equal);

    /* first, create the vfolder store, and set it up */
    storeuri = g_strdup_printf("vfolder:%s/vfolder", mail_component_peek_base_directory (mail_component_peek ()));
    vfolder_store = camel_session_get_store(session, storeuri, NULL);
    if (vfolder_store == NULL) {
        g_warning("Cannot open vfolder store - no vfolders available");
        return;
    }

    camel_object_hook_event(vfolder_store, "folder_created",
                (CamelObjectEventHookFunc)store_folder_created, NULL);
    camel_object_hook_event(vfolder_store, "folder_deleted",
                (CamelObjectEventHookFunc)store_folder_deleted, NULL);
    camel_object_hook_event(vfolder_store, "folder_renamed",
                (CamelObjectEventHookFunc)store_folder_renamed, NULL);
    
    d(printf("got store '%s' = %p\n", storeuri, vfolder_store));
    mail_component_load_store_by_uri (mail_component_peek (), storeuri, _("VFolders"));
    
    /* load our rules */
    user = g_strdup_printf ("%s/mail/vfolders.xml", mail_component_peek_base_directory (mail_component_peek ()));
    context = vfolder_context_new ();
    if (rule_context_load ((RuleContext *)context,
                   EVOLUTION_PRIVDATADIR "/vfoldertypes.xml", user) != 0) {
        g_warning("cannot load vfolders: %s\n", ((RuleContext *)context)->error);
    }
    g_free (user);
    
    g_signal_connect(context, "rule_added", G_CALLBACK(context_rule_added), context);
    g_signal_connect(context, "rule_removed", G_CALLBACK(context_rule_removed), context);

    /* and setup the rules we have */
    rule = NULL;
    while ( (rule = rule_context_next_rule((RuleContext *)context, rule, NULL)) ) {
        if (rule->name)
            context_rule_added((RuleContext *)context, rule);
        else
            d(printf("invalid rule (%p) encountered: rule->name is NULL\n", rule));
    }

    g_free(storeuri);
}

static GtkWidget *vfolder_editor = NULL;

static void
vfolder_editor_response (GtkWidget *dialog, int button, void *data)
{
    char *user;

    user = g_strdup_printf ("%s/mail/vfolders.xml", mail_component_peek_base_directory (mail_component_peek ()));

    switch(button) {
    case GTK_RESPONSE_ACCEPT:
        rule_context_save((RuleContext *)context, user);
        break;
    default:
        rule_context_revert((RuleContext *)context, user);
    }

    vfolder_editor = NULL;

    gtk_widget_destroy(dialog);

    g_free (user);
}

void
vfolder_edit (void)
{
    if (vfolder_editor) {
        gdk_window_raise (GTK_WIDGET (vfolder_editor)->window);
        return;
    }
    
    vfolder_editor = GTK_WIDGET (vfolder_editor_new (context));
    gtk_window_set_title (GTK_WINDOW (vfolder_editor), _("vFolders"));
    g_signal_connect(vfolder_editor, "response", G_CALLBACK(vfolder_editor_response), NULL);
    
    gtk_widget_show (vfolder_editor);
}

static void
edit_rule_response(GtkWidget *w, int button, void *data)
{
    if (button == GTK_RESPONSE_OK) {
        char *user;
        FilterRule *rule = g_object_get_data (G_OBJECT (w), "rule");
        FilterRule *orig = g_object_get_data (G_OBJECT (w), "orig");

        filter_rule_copy(orig, rule);
        user = g_strdup_printf("%s/mail/vfolders.xml", mail_component_peek_base_directory (mail_component_peek ()));
        rule_context_save((RuleContext *)context, user);
        g_free(user);
    }

    gtk_widget_destroy(w);
}

void
vfolder_edit_rule(const char *uri)
{
    GtkWidget *w;
    GtkDialog *gd;
    FilterRule *rule, *newrule;
    CamelURL *url;

    url = camel_url_new(uri, NULL);
    if (url && url->fragment
        && (rule = rule_context_find_rule((RuleContext *)context, url->fragment, NULL))) {
        g_object_ref((GtkObject *)rule);
        newrule = filter_rule_clone(rule);

        w = filter_rule_get_widget((FilterRule *)newrule, (RuleContext *)context);

        gd = (GtkDialog *)gtk_dialog_new_with_buttons(_("Edit VFolder"), NULL,
                                  GTK_DIALOG_DESTROY_WITH_PARENT,
                                  GTK_STOCK_CANCEL,
                                  GTK_RESPONSE_CANCEL,
                                  GTK_STOCK_OK,
                                  GTK_RESPONSE_OK,
                                  NULL);
        gtk_container_set_border_width (GTK_CONTAINER (gd), 6);
        gtk_box_set_spacing ((GtkBox *) gd->vbox, 6);
        gtk_dialog_set_default_response(gd, GTK_RESPONSE_OK);
        g_object_set(gd, "allow_shrink", FALSE, "allow_grow", TRUE, NULL);
        gtk_window_set_default_size (GTK_WINDOW (gd), 500, 500);
        gtk_box_pack_start((GtkBox *)gd->vbox, w, TRUE, TRUE, 0);
        gtk_widget_show((GtkWidget *)gd);
        g_object_set_data_full(G_OBJECT(gd), "rule", newrule, (GtkDestroyNotify)g_object_unref);
        g_object_set_data_full(G_OBJECT(gd), "orig", rule, (GtkDestroyNotify)g_object_unref);
        g_signal_connect(gd, "response", G_CALLBACK(edit_rule_response), NULL);
        gtk_widget_show((GtkWidget *)gd);
    } else {
        e_notice (NULL, GTK_MESSAGE_WARNING,
              _("Trying to edit a vfolder '%s' which doesn't exist."), uri);
    }

    if (url)
        camel_url_free(url);
}

static void
new_rule_clicked(GtkWidget *w, int button, void *data)
{
    if (button == GTK_RESPONSE_OK) {
        char *user;
        FilterRule *rule = g_object_get_data((GObject *)w, "rule");

        if (!filter_rule_validate(rule)) {
            /* no need to popup a dialog because the validate code does that. */
            return;
        }

        if (rule_context_find_rule ((RuleContext *)context, rule->name, rule->source)) {
            GtkWidget *dialog =
                gtk_message_dialog_new ((GtkWindow *) w, GTK_DIALOG_DESTROY_WITH_PARENT,
                            GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE,
                            _("Rule name '%s' is not unique, choose another."),
                            rule->name);

            gtk_dialog_run ((GtkDialog *) dialog);
            gtk_widget_destroy (dialog);

            return;
        }


        g_object_ref(rule);
        rule_context_add_rule((RuleContext *)context, rule);
        user = g_strdup_printf("%s/mail/vfolders.xml", mail_component_peek_base_directory (mail_component_peek ()));
        rule_context_save((RuleContext *)context, user);
        g_free(user);
    }

    gtk_widget_destroy(w);
}

FilterPart *
vfolder_create_part(const char *name)
{
    return rule_context_create_part((RuleContext *)context, name);
}

/* clones a filter/search rule into a matching vfolder rule (assuming the same system definitions) */
FilterRule *
vfolder_clone_rule(FilterRule *in)
{
    FilterRule *rule = (FilterRule *)vfolder_rule_new();
    xmlNodePtr xml;

    xml = filter_rule_xml_encode(in);
    filter_rule_xml_decode(rule, xml, (RuleContext *)context);
    xmlFreeNodeList(xml);

    return rule;
}

/* adds a rule with a gui */
void
vfolder_gui_add_rule(VfolderRule *rule)
{
    GtkWidget *w;
    GtkDialog *gd;

    w = filter_rule_get_widget((FilterRule *)rule, (RuleContext *)context);

    gd = (GtkDialog *)gtk_dialog_new_with_buttons(_("New VFolder"),
                              NULL,
                              GTK_DIALOG_DESTROY_WITH_PARENT,
                              GTK_STOCK_CANCEL,
                              GTK_RESPONSE_CANCEL,
                              GTK_STOCK_OK,
                              GTK_RESPONSE_OK,
                              NULL);
    gtk_dialog_set_default_response(gd, GTK_RESPONSE_OK);
    gtk_container_set_border_width (GTK_CONTAINER (gd), 6);
    gtk_box_set_spacing ((GtkBox *) gd->vbox, 6);
    g_object_set(gd, "allow_shrink", FALSE, "allow_grow", TRUE, NULL);
    gtk_window_set_default_size (GTK_WINDOW (gd), 500, 500);
    gtk_box_pack_start((GtkBox *)gd->vbox, w, TRUE, TRUE, 0);
    gtk_widget_show((GtkWidget *)gd);
    g_object_set_data_full(G_OBJECT(gd), "rule", rule, (GtkDestroyNotify)g_object_unref);
    g_signal_connect(gd, "response", G_CALLBACK(new_rule_clicked), NULL);
    gtk_widget_show((GtkWidget *)gd);
}

void
vfolder_gui_add_from_message(CamelMimeMessage *msg, int flags, const char *source)
{
    VfolderRule *rule;

    g_return_if_fail (msg != NULL);

    rule = (VfolderRule*)vfolder_rule_from_message(context, msg, flags, source);
    vfolder_gui_add_rule(rule);
}

static void
vfolder_foreach_cb (gpointer key, gpointer data, gpointer user_data)
{
    CamelFolder *folder = CAMEL_FOLDER (data);
    
    if (folder)
        camel_object_unref(folder);
    
    g_free (key);
}

void
mail_vfolder_shutdown (void)
{
    g_hash_table_foreach (vfolder_hash, vfolder_foreach_cb, NULL);
    g_hash_table_destroy (vfolder_hash);
    vfolder_hash = NULL;

    if (vfolder_store) {
        camel_object_unref (vfolder_store);
        vfolder_store = NULL;
    }
    
    if (context) {
        g_object_unref(context);
        context = NULL;
    }
}