path: root/addressbook/gui/merging/eab-contact-merging.c

/*
 * Code for checking for duplicates when doing EContact work.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Christopher James Lahey <clahey@ximian.com>
 *      Chris Toshok <toshok@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include "eab-contact-merging.h"
#include "eab-contact-compare.h"
#include <gtk/gtk.h>
#include <string.h>
#include "addressbook/gui/widgets/eab-contact-display.h"
#include "e-util/e-util.h"
#include "e-util/e-util-private.h"
#include <glib/gi18n.h>

typedef struct dropdown_data dropdown_data;
typedef enum {
    E_CONTACT_MERGING_ADD,
    E_CONTACT_MERGING_COMMIT,
    E_CONTACT_MERGING_FIND
} EContactMergingOpType;

typedef struct {
    EContactMergingOpType op;
    EBookClient *book_client;
    /*contact is the new contact which the user has tried to add to the addressbook*/
    EContact *contact;
    /*match is the duplicate contact already existing in the addressbook*/
    EContact *match;
    GList *avoid;
    EABMergingAsyncCallback cb;
    EABMergingIdAsyncCallback id_cb;
    EABMergingContactAsyncCallback c_cb;
    gpointer closure;
} EContactMergingLookup;

struct dropdown_data {
    EContact *match;
    EContactField field;
};
static void match_query_callback (EContact *contact, EContact *match, EABContactMatchType type, gpointer closure);

#define SIMULTANEOUS_MERGING_REQUESTS 20

static GList *merging_queue = NULL;
static gint running_merge_requests = 0;

static void
add_lookup (EContactMergingLookup *lookup)
{
    if (running_merge_requests < SIMULTANEOUS_MERGING_REQUESTS) {
        running_merge_requests++;
        eab_contact_locate_match_full (lookup->book_client, lookup->contact, lookup->avoid, match_query_callback, lookup);
    }
    else {
        merging_queue = g_list_append (merging_queue, lookup);
    }
}

static void
finished_lookup (void)
{
    running_merge_requests--;

    while (running_merge_requests < SIMULTANEOUS_MERGING_REQUESTS) {
        EContactMergingLookup *lookup;

        if (!merging_queue)
            break;

        lookup = merging_queue->data;

        merging_queue = g_list_remove_link (merging_queue, merging_queue);

        running_merge_requests++;
        eab_contact_locate_match_full (
            lookup->book_client, lookup->contact,
            lookup->avoid, match_query_callback, lookup);
    }
}

static void
free_lookup (EContactMergingLookup *lookup)
{
    g_object_unref (lookup->book_client);
    g_object_unref (lookup->contact);
    g_list_free (lookup->avoid);
    if (lookup->match)
        g_object_unref (lookup->match);
    g_free (lookup);
}

static void
final_id_cb (EBookClient *book_client,
             const GError *error,
             const gchar *id,
             gpointer closure)
{
    EContactMergingLookup *lookup = closure;

    if (lookup->id_cb)
        lookup->id_cb (lookup->book_client, error, id, lookup->closure);

    free_lookup (lookup);

    finished_lookup ();
}

static void
final_cb_as_id (EBookClient *book_client,
                const GError *error,
                gpointer closure)
{
    EContactMergingLookup *lookup = closure;

    if (lookup->id_cb)
        lookup->id_cb (
            lookup->book_client, error,
            lookup->contact ?
                e_contact_get_const (
                lookup->contact, E_CONTACT_UID) : NULL,
            lookup->closure);

    free_lookup (lookup);

    finished_lookup ();
}

static void
final_cb (EBookClient *book_client,
          const GError *error,
          gpointer closure)
{
    EContactMergingLookup *lookup = closure;

    if (lookup->cb)
        lookup->cb (lookup->book_client, error, lookup->closure);

    free_lookup (lookup);

    finished_lookup ();
}

static void
modify_contact_ready_cb (GObject *source_object,
                         GAsyncResult *result,
                         gpointer user_data)
{
    EBookClient *book_client = E_BOOK_CLIENT (source_object);
    EContactMergingLookup *lookup = user_data;
    GError *error = NULL;

    g_return_if_fail (book_client != NULL);
    g_return_if_fail (lookup != NULL);

    e_book_client_modify_contact_finish (book_client, result, &error);

    if (lookup->op == E_CONTACT_MERGING_ADD)
        final_cb_as_id (book_client, error, lookup);
    else
        final_cb (book_client, error, lookup);

    if (error)
        g_error_free (error);
}

static void
add_contact_ready_cb (GObject *source_object,
                      GAsyncResult *result,
                      gpointer user_data)
{
    EBookClient *book_client = E_BOOK_CLIENT (source_object);
    EContactMergingLookup *lookup = user_data;
    gchar *uid = NULL;
    GError *error = NULL;

    g_return_if_fail (book_client != NULL);
    g_return_if_fail (lookup != NULL);

    if (!e_book_client_add_contact_finish (book_client, result, &uid, &error))
        uid = NULL;

    final_id_cb (book_client, error, uid, lookup);

    if (error)
        g_error_free (error);
}

static void
doit (EContactMergingLookup *lookup,
      gboolean force_modify)
{
    if (lookup->op == E_CONTACT_MERGING_ADD) {
        if (force_modify)
            e_book_client_modify_contact (lookup->book_client, lookup->contact, NULL, modify_contact_ready_cb, lookup);
        else
            e_book_client_add_contact (lookup->book_client, lookup->contact, NULL, add_contact_ready_cb, lookup);
    } else if (lookup->op == E_CONTACT_MERGING_COMMIT)
        e_book_client_modify_contact (lookup->book_client, lookup->contact, NULL, modify_contact_ready_cb, lookup);
}

static void
cancelit (EContactMergingLookup *lookup)
{
    GError *error = e_client_error_create (E_CLIENT_ERROR_CANCELLED, NULL);

    if (lookup->op == E_CONTACT_MERGING_ADD) {
        final_id_cb (lookup->book_client, error, NULL, lookup);
    } else if (lookup->op == E_CONTACT_MERGING_COMMIT) {
        final_cb (lookup->book_client, error, lookup);
    }

    g_error_free (error);
}

static void
dialog_map (GtkWidget *window,
            GdkEvent *event,
            GtkWidget *table)
{
    GtkAllocation allocation;
    gint h, w;

    gtk_widget_get_allocation (table, &allocation);

    /* Spacing around the table */
    w = allocation.width + 30;
    /* buttons and outer spacing */
    h = allocation.height + 60;
    if (w > 400)
        w = 400;
    if (h > 450)
        h = 450;

    gtk_widget_set_size_request (window, w, h);
}

static void
dropdown_changed (GtkWidget *dropdown,
                  dropdown_data *data)
{
    gchar *str;
    str = gtk_combo_box_text_get_active_text (GTK_COMBO_BOX_TEXT (dropdown));

    if (g_ascii_strcasecmp(str, ""))
        e_contact_set (data->match, data->field, str);
    else
        e_contact_set (data->match, data->field, NULL);
    return;
}

static void
remove_contact_ready_cb (GObject *source_object,
                         GAsyncResult *result,
                         gpointer user_data)
{
    EBookClient *book_client = E_BOOK_CLIENT (source_object);
    EContactMergingLookup *lookup = user_data;
    GError *error = NULL;

    g_return_if_fail (book_client != NULL);
    g_return_if_fail (lookup != NULL);

    e_book_client_remove_contact_finish (book_client, result, &error);

    if (error != NULL) {
        g_warning (
            "%s: Failed to remove contact: %s",
            G_STRFUNC, error->message);
        g_error_free (error);
    }

    e_book_client_add_contact (
        book_client, lookup->contact, NULL,
        add_contact_ready_cb, lookup);
}

static gint
mergeit (EContactMergingLookup *lookup)
{
    GtkWidget *scrolled_window, *label, *hbox, *dropdown;
    GtkWidget *content_area;
    GtkDialog *dialog;
    GtkTable *table;
    EContactField field;
    gchar *str = NULL, *string = NULL, *string1 = NULL;
    gint num_of_email;
    GList *email_attr_list;
    gint row = -1;
    gint value = 0, result;

    dialog = (GtkDialog *)(gtk_dialog_new_with_buttons (_("Merge Contact"), NULL, 0, NULL));
    gtk_container_set_border_width (GTK_CONTAINER (dialog), 5);

    content_area = gtk_dialog_get_content_area (dialog);

    scrolled_window = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_window),
                    GTK_POLICY_AUTOMATIC,
                    GTK_POLICY_AUTOMATIC);

    table = (GtkTable *) gtk_table_new (20, 2, FALSE);
    gtk_container_set_border_width ((GtkContainer *) table, 12);
    gtk_table_set_row_spacings (table, 6);
    gtk_table_set_col_spacings (table, 2);

    gtk_dialog_add_buttons ((GtkDialog *) dialog,
                GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
                _("_Merge"), GTK_RESPONSE_OK,
                NULL);

    email_attr_list = e_contact_get_attributes (lookup->match, E_CONTACT_EMAIL);
    num_of_email = g_list_length (email_attr_list);

    /*we match all the string fields of the already existing contact and the new contact.*/
    for (field = E_CONTACT_FULL_NAME; field != (E_CONTACT_LAST_SIMPLE_STRING -1); field++) {
        dropdown_data *data = NULL;
        string = (gchar *) e_contact_get_const (lookup->contact, field);
        string1 = (gchar *) e_contact_get_const (lookup->match, field);

        /*the field must exist in the new as well as the duplicate contact*/
        if (string && *string) {
            /*Four email id's present, should be compared with all email id's in duplicate contact */
            /*Merge only if number of email id's in existing contact is less than 4 */
            if ((field == E_CONTACT_EMAIL_1 || field == E_CONTACT_EMAIL_2
                || field == E_CONTACT_EMAIL_3 || field == E_CONTACT_EMAIL_4) && (num_of_email < 4)) {
                EContactField use_field = field;
                row++;
                str = (gchar *) e_contact_get_const (lookup->contact, use_field);
                switch (num_of_email)
                {
                case 0:
                    use_field = E_CONTACT_EMAIL_1;
                    break;
                case 1:
                    /*New contact has email that is NOT equal to email in duplicate contact*/
                    if ((str && *str) && (g_ascii_strcasecmp (e_contact_get_const (lookup->match, E_CONTACT_EMAIL_1),str))) {
                        use_field = E_CONTACT_EMAIL_2;
                        break;
                    }
                    else/*Either the new contact has no email OR the email already exist in the duplicate contact */
                        continue;
                case 2:
                    /*New contact has email and it is equal to neither of the 2 emails in the duplicate contact*/
                    if ((str && *str) &&
                            (g_ascii_strcasecmp (str,e_contact_get_const (lookup->match, E_CONTACT_EMAIL_1))) &&
                            (g_ascii_strcasecmp (e_contact_get_const (lookup->match, E_CONTACT_EMAIL_2),str))) {
                        use_field = E_CONTACT_EMAIL_3;
                        break;
                    }
                    else
                        continue;
                case 3:
                    /*New contact has email and it is equal to none of the 3 emails in the duplicate contact*/
                    if ((str && *str) &&
                            (g_ascii_strcasecmp (e_contact_get_const (lookup->match, E_CONTACT_EMAIL_1),str)) &&
                            (g_ascii_strcasecmp (e_contact_get_const (lookup->match, E_CONTACT_EMAIL_2),str)) &&
                            (g_ascii_strcasecmp (e_contact_get_const (lookup->match, E_CONTACT_EMAIL_3),str)))
                        use_field = E_CONTACT_EMAIL_4;
                    else
                        continue;
                }
                label = gtk_label_new (_("Email"));
                hbox = gtk_hbox_new (FALSE, 0);
                gtk_box_pack_start (GTK_BOX (hbox), (GtkWidget *) label, FALSE, FALSE, 0);
                gtk_table_attach_defaults (table, (GtkWidget *) hbox, 0, 1, row, row + 1);

                dropdown = gtk_combo_box_text_new ();
                gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (dropdown), string);

                data = g_new0 (dropdown_data, 1);

                gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (dropdown), "");

                gtk_combo_box_set_active (GTK_COMBO_BOX (dropdown), 0);
                data->field = use_field;
                data->match = lookup->match;
                e_contact_set (lookup->match, use_field, string);
                g_signal_connect (dropdown, "changed", G_CALLBACK(dropdown_changed), data);

                hbox = gtk_hbox_new (FALSE, 0);
                gtk_box_pack_start (GTK_BOX (hbox), (GtkWidget *) dropdown, FALSE, FALSE, 0);
                gtk_table_attach_defaults (table, (GtkWidget *) hbox, 1, 2, row, row + 1);
                gtk_widget_show ((GtkWidget *) dropdown);
                continue;
            }
            if (((field == E_CONTACT_FULL_NAME) && (!g_ascii_strcasecmp (string, string1)))) {
                row++;
                label = gtk_label_new (e_contact_pretty_name (field));
                hbox = gtk_hbox_new (FALSE, 0);
                gtk_box_pack_start (GTK_BOX (hbox), (GtkWidget *) label, FALSE, FALSE, 0);
                gtk_table_attach_defaults (table, (GtkWidget *) hbox, 0, 1, row, row + 1);

                label = gtk_label_new (string);
                hbox = gtk_hbox_new (FALSE, 0);
                gtk_box_pack_start (GTK_BOX (hbox), (GtkWidget *) label, FALSE, FALSE, 0);
                gtk_table_attach_defaults (table, (GtkWidget *) hbox, 1, 2, row, row + 1);
                continue;
            }

            /*for all string fields except name and email*/
            if (!(string1 && *string1) || (g_ascii_strcasecmp (string, string1))) {
                row++;
                label = gtk_label_new (e_contact_pretty_name (field));
                hbox = gtk_hbox_new (FALSE, 0);
                gtk_box_pack_start (GTK_BOX (hbox), (GtkWidget *) label, FALSE, FALSE, 0);
                gtk_table_attach_defaults (table, (GtkWidget *) hbox, 0, 1, row, row + 1);
                data = g_new0 (dropdown_data, 1);
                dropdown = gtk_combo_box_text_new ();
                gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (dropdown), string);
                e_contact_set (lookup->match, field, string);

                if (string1 && *string1)
                    gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (dropdown), string1);
                else
                    gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (dropdown), "");

                gtk_combo_box_set_active (GTK_COMBO_BOX (dropdown), 0);
                data->field = field;
                data->match = lookup->match;

                if (field == E_CONTACT_NICKNAME || field == E_CONTACT_GIVEN_NAME)
                    gtk_widget_set_sensitive ((GtkWidget *) dropdown, FALSE);

                g_signal_connect (dropdown, "changed", G_CALLBACK(dropdown_changed), data);
                hbox = gtk_hbox_new (FALSE, 0);
                gtk_box_pack_start (GTK_BOX (hbox), (GtkWidget *) dropdown, FALSE, FALSE, 0);
                gtk_table_attach_defaults (table, (GtkWidget *) hbox, 1, 2, row, row + 1);
                gtk_widget_show_all ((GtkWidget *) dropdown);
            }
        }
    }

    gtk_window_set_default_size (GTK_WINDOW (dialog), 420, 300);
    gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (scrolled_window), GTK_WIDGET (table));
    gtk_box_pack_start (GTK_BOX (content_area), GTK_WIDGET (scrolled_window), TRUE, TRUE, 0);
    gtk_widget_show (scrolled_window);
    g_signal_connect (dialog, "map-event", G_CALLBACK (dialog_map), table);
    gtk_widget_show_all ((GtkWidget *) table);
    result = gtk_dialog_run (dialog);

    switch (result) {
    case GTK_RESPONSE_OK:
             g_object_unref (lookup->contact);
             lookup->contact = g_object_ref (lookup->match);
             e_book_client_remove_contact (lookup->book_client, lookup->match, NULL, remove_contact_ready_cb, lookup);
             value = 1;
             break;
    case GTK_RESPONSE_CANCEL:
    default:
             value = 0;
             break;
    }
    gtk_widget_destroy (GTK_WIDGET (dialog));
    g_list_free (email_attr_list);
    return value;
}

static gboolean
check_if_same (EContact *contact,
               EContact *match)
{
    EContactField field;
    GList *email_attr_list;
    gint num_of_email;
    gchar *str = NULL, *string = NULL, *string1 = NULL;

    for (field = E_CONTACT_FULL_NAME; field != (E_CONTACT_LAST_SIMPLE_STRING -1); field++) {
        email_attr_list = e_contact_get_attributes (match, E_CONTACT_EMAIL);
        num_of_email = g_list_length (email_attr_list);

        if ((field == E_CONTACT_EMAIL_1 || field == E_CONTACT_EMAIL_2
             || field == E_CONTACT_EMAIL_3 || field == E_CONTACT_EMAIL_4) && (num_of_email < 4)) {
            str = (gchar *) e_contact_get_const (contact, field);
            switch (num_of_email)
            {
            case 0:
                return FALSE;
            case 1:
                if ((str && *str) && (g_ascii_strcasecmp (e_contact_get_const (match, E_CONTACT_EMAIL_1),str)))
                    return FALSE;
            case 2:
                if ((str && *str) && (g_ascii_strcasecmp (str,e_contact_get_const (match, E_CONTACT_EMAIL_1))) &&
                        (g_ascii_strcasecmp (e_contact_get_const (match, E_CONTACT_EMAIL_2),str)))
                    return FALSE;
            case 3:
                if ((str && *str) && (g_ascii_strcasecmp (e_contact_get_const (match, E_CONTACT_EMAIL_1),str)) &&
                        (g_ascii_strcasecmp (e_contact_get_const (match, E_CONTACT_EMAIL_2),str)) &&
                        (g_ascii_strcasecmp (e_contact_get_const (match, E_CONTACT_EMAIL_3),str)))
                    return FALSE;
            }
        }
        else {
            string = (gchar *) e_contact_get_const (contact, field);
            string1 = (gchar *) e_contact_get_const (match, field);
            if ((string && *string) && (string1 && *string1) && (g_ascii_strcasecmp (string1,string)))
                return FALSE;
            /*if the field entry exist in either of the contacts,we'll have to give the choice and thus merge button should be sensitive*/
            else if ((string && *string) && !(string1 && *string1))
                return FALSE;
        }
    }
    g_list_free (email_attr_list);
    return TRUE;
}

static void
response (GtkWidget *dialog,
          gint response,
          EContactMergingLookup *lookup)
{
    static gint merge_response;

    switch (response) {
    case 0:
        doit (lookup, FALSE);
        break;
    case 1:
        cancelit (lookup);
        break;
    case 2:
        merge_response = mergeit (lookup);
        if (merge_response)
            break;
        return;
    case GTK_RESPONSE_DELETE_EVENT:
        cancelit (lookup);
        break;
    }

    gtk_widget_destroy (dialog);
}

static void
match_query_callback (EContact *contact,
                      EContact *match,
                      EABContactMatchType type,
                      gpointer closure)
{
    EContactMergingLookup *lookup = closure;
    gint flag;
    gboolean same_uids;

    if (lookup->op == E_CONTACT_MERGING_FIND) {
        if (lookup->c_cb)
            lookup->c_cb (lookup->book_client, NULL, (gint) type <= (gint) EAB_CONTACT_MATCH_VAGUE ? NULL : match, lookup->closure);

        free_lookup (lookup);
        finished_lookup ();
        return;
    }

    /* if had same UID, then we are editing old contact, thus force commit change to it */
    same_uids = contact && match
        && e_contact_get_const (contact, E_CONTACT_UID)
        && e_contact_get_const (match, E_CONTACT_UID)
        && g_str_equal (e_contact_get_const (contact, E_CONTACT_UID), e_contact_get_const (match, E_CONTACT_UID));

    if ((gint) type <= (gint) EAB_CONTACT_MATCH_VAGUE || same_uids) {
        doit (lookup, same_uids);
    } else {
        GtkBuilder *builder;
        GtkWidget *container;
        GtkWidget *merge_button;
        GtkWidget *widget;

        /* XXX I think we're leaking the GtkBuilder. */
        builder = gtk_builder_new ();

        lookup->match = g_object_ref (match);
        if (lookup->op == E_CONTACT_MERGING_ADD) {
            /* Compares all the values of contacts and return true, if they match */
            flag = check_if_same (contact, match);
            e_load_ui_builder_definition (
                builder, "eab-contact-duplicate-detected.ui");
            merge_button = e_builder_get_widget (builder, "button5");
            /* Merge Button not sensitive when all values are same */
            if (flag)
                gtk_widget_set_sensitive (GTK_WIDGET (merge_button), FALSE);
        } else if (lookup->op == E_CONTACT_MERGING_COMMIT) {
            e_load_ui_builder_definition (
                builder, "eab-contact-commit-duplicate-detected.ui");
        } else {
            doit (lookup, FALSE);
            return;
        }

        widget = e_builder_get_widget (builder, "custom-old-contact");
        eab_contact_display_set_mode (
            EAB_CONTACT_DISPLAY (widget),
            EAB_CONTACT_DISPLAY_RENDER_COMPACT);
        eab_contact_display_set_contact (
            EAB_CONTACT_DISPLAY (widget), match);

        widget = e_builder_get_widget (builder, "custom-new-contact");
        eab_contact_display_set_mode (
            EAB_CONTACT_DISPLAY (widget),
            EAB_CONTACT_DISPLAY_RENDER_COMPACT);
        eab_contact_display_set_contact (
            EAB_CONTACT_DISPLAY (widget), contact);

        widget = e_builder_get_widget (builder, "dialog-duplicate-contact");

        gtk_widget_ensure_style (widget);

        container = gtk_dialog_get_action_area (GTK_DIALOG (widget));
        gtk_container_set_border_width (GTK_CONTAINER (container), 12);

        container = gtk_dialog_get_content_area (GTK_DIALOG (widget));
        gtk_container_set_border_width (GTK_CONTAINER (container), 0);

        g_signal_connect (
            widget, "response",
            G_CALLBACK (response), lookup);

        gtk_widget_show_all (widget);
    }
}

gboolean
eab_merging_book_add_contact (EBookClient *book_client,
                              EContact *contact,
                              EABMergingIdAsyncCallback cb,
                              gpointer closure)
{
    EContactMergingLookup *lookup;

    lookup = g_new (EContactMergingLookup, 1);

    lookup->op = E_CONTACT_MERGING_ADD;
    lookup->book_client = g_object_ref (book_client);
    lookup->contact = g_object_ref (contact);
    lookup->id_cb = cb;
    lookup->closure = closure;
    lookup->avoid = NULL;
    lookup->match = NULL;

    add_lookup (lookup);

    return TRUE;
}

gboolean
eab_merging_book_modify_contact (EBookClient *book_client,
                                 EContact *contact,
                                 EABMergingAsyncCallback cb,
                                 gpointer closure)
{
    EContactMergingLookup *lookup;

    lookup = g_new (EContactMergingLookup, 1);

    lookup->op = E_CONTACT_MERGING_COMMIT;
    lookup->book_client = g_object_ref (book_client);
    lookup->contact = g_object_ref (contact);
    lookup->cb = cb;
    lookup->closure = closure;
    lookup->avoid = g_list_append (NULL, contact);
    lookup->match = NULL;

    add_lookup (lookup);

    return TRUE;
}

gboolean
eab_merging_book_find_contact (EBookClient *book_client,
                               EContact *contact,
                               EABMergingContactAsyncCallback cb,
                               gpointer closure)
{
    EContactMergingLookup *lookup;

    lookup = g_new (EContactMergingLookup, 1);

    lookup->op = E_CONTACT_MERGING_FIND;
    lookup->book_client = g_object_ref (book_client);
    lookup->contact = g_object_ref (contact);
    lookup->c_cb = cb;
    lookup->closure = closure;
    lookup->avoid = g_list_append (NULL, contact);
    lookup->match = NULL;

    add_lookup (lookup);

    return TRUE;
}