path: root/mail/em-folder-tree-model.c

/*
 * 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:
 *      Jeffrey Stedfast <fejj@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include "em-folder-tree-model.h"

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>

#include <glib/gi18n.h>

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

#include "mail-tools.h"
#include "mail-mt.h"
#include "mail-ops.h"

/* sigh, these 2 only needed for outbox total count checking - a mess */
#include "mail-folder-cache.h"

#include "em-utils.h"
#include "em-folder-utils.h"
#include "em-event.h"

#include "e-mail-folder-utils.h"
#include "shell/e-shell.h"

#define EM_FOLDER_TREE_MODEL_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), EM_TYPE_FOLDER_TREE_MODEL, EMFolderTreeModelPrivate))

#define d(x)

struct _EMFolderTreeModelPrivate {
    /* This is set by EMailShellSidebar.  It allows new EMFolderTree
     * instances to initialize their selection and expanded states to
     * mimic the sidebar. */
    GtkTreeSelection *selection;  /* weak reference */

    EMailSession *session;
    EMailAccountStore *account_store;

    /* CamelStore -> EMFolderTreeStoreInfo */
    GHashTable *store_index;

    /* URI -> GtkTreeRowReference */
    GHashTable *uri_index;
};

enum {
    PROP_0,
    PROP_SELECTION,
    PROP_SESSION
};

enum {
    LOADING_ROW,
    LOADED_ROW,
    LAST_SIGNAL
};

static gpointer parent_class;
static guint signals[LAST_SIGNAL];

G_DEFINE_TYPE (EMFolderTreeModel, em_folder_tree_model, GTK_TYPE_TREE_STORE)

static void
store_info_free (EMFolderTreeModelStoreInfo *si)
{
    g_signal_handler_disconnect (si->store, si->created_id);
    g_signal_handler_disconnect (si->store, si->deleted_id);
    g_signal_handler_disconnect (si->store, si->renamed_id);

    if (si->subscribed_id > 0)
        g_signal_handler_disconnect (si->store, si->subscribed_id);
    if (si->unsubscribed_id > 0)
        g_signal_handler_disconnect (si->store, si->unsubscribed_id);

    g_object_unref (si->store);
    gtk_tree_row_reference_free (si->row);
    g_hash_table_destroy (si->full_hash);
    g_free (si);
}

static gint
folder_tree_model_sort (GtkTreeModel *model,
                        GtkTreeIter *a,
                        GtkTreeIter *b,
                        gpointer unused)
{
    EMFolderTreeModel *folder_tree_model;
    gchar *aname, *bname;
    CamelService *service_a;
    CamelService *service_b;
    gboolean a_is_store;
    gboolean b_is_store;
    const gchar *store_uid = NULL;
    guint32 flags_a, flags_b;
    gint rv = -2;

    folder_tree_model = EM_FOLDER_TREE_MODEL (model);

    gtk_tree_model_get (
        model, a,
        COL_BOOL_IS_STORE, &a_is_store,
        COL_POINTER_CAMEL_STORE, &service_a,
        COL_STRING_DISPLAY_NAME, &aname,
        COL_UINT_FLAGS, &flags_a,
        -1);

    gtk_tree_model_get (
        model, b,
        COL_BOOL_IS_STORE, &b_is_store,
        COL_POINTER_CAMEL_STORE, &service_b,
        COL_STRING_DISPLAY_NAME, &bname,
        COL_UINT_FLAGS, &flags_b,
        -1);

    if (CAMEL_IS_SERVICE (service_a))
        store_uid = camel_service_get_uid (service_a);

    if (a_is_store && b_is_store) {
        rv = e_mail_account_store_compare_services (
            folder_tree_model->priv->account_store,
            service_a, service_b);

    } else if (g_strcmp0 (store_uid, E_MAIL_SESSION_VFOLDER_UID) == 0) {
        /* UNMATCHED is always last. */
        if (aname && !strcmp (aname, _("UNMATCHED")))
            rv = 1;
        else if (bname && !strcmp (bname, _("UNMATCHED")))
            rv = -1;

    } else {
        /* Inbox is always first. */
        if ((flags_a & CAMEL_FOLDER_TYPE_MASK) == CAMEL_FOLDER_TYPE_INBOX)
            rv = -1;
        else if ((flags_b & CAMEL_FOLDER_TYPE_MASK) == CAMEL_FOLDER_TYPE_INBOX)
            rv = 1;
    }

    if (rv == -2) {
        if (aname != NULL && bname != NULL)
            rv = g_utf8_collate (aname, bname);
        else if (aname == bname)
            rv = 0;
        else if (aname == NULL)
            rv = -1;
        else
            rv = 1;
    }

    g_free (aname);
    g_free (bname);

    return rv;
}

static void
folder_tree_model_service_removed (EMailAccountStore *account_store,
                                   CamelService *service,
                                   EMFolderTreeModel *folder_tree_model)
{
    em_folder_tree_model_remove_store (
        folder_tree_model, CAMEL_STORE (service));
}

static void
folder_tree_model_service_enabled (EMailAccountStore *account_store,
                                   CamelService *service,
                                   EMFolderTreeModel *folder_tree_model)
{
    em_folder_tree_model_add_store (
        folder_tree_model, CAMEL_STORE (service));
}

static void
folder_tree_model_service_disabled (EMailAccountStore *account_store,
                                    CamelService *service,
                                    EMFolderTreeModel *folder_tree_model)
{
    em_folder_tree_model_remove_store (
        folder_tree_model, CAMEL_STORE (service));
}

static void
folder_tree_model_services_reordered (EMailAccountStore *account_store,
                                      gboolean default_restored,
                                      EMFolderTreeModel *folder_tree_model)
{
    /* This forces the tree store to re-sort. */
    gtk_tree_sortable_set_default_sort_func (
        GTK_TREE_SORTABLE (folder_tree_model),
        folder_tree_model_sort, NULL, NULL);
}

static void
folder_tree_model_selection_finalized_cb (EMFolderTreeModel *model)
{
    model->priv->selection = NULL;

    g_object_notify (G_OBJECT (model), "selection");
}

static void
folder_tree_model_set_property (GObject *object,
                                guint property_id,
                                const GValue *value,
                                GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_SELECTION:
            em_folder_tree_model_set_selection (
                EM_FOLDER_TREE_MODEL (object),
                g_value_get_object (value));
            return;

        case PROP_SESSION:
            em_folder_tree_model_set_session (
                EM_FOLDER_TREE_MODEL (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
folder_tree_model_get_property (GObject *object,
                                guint property_id,
                                GValue *value,
                                GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_SELECTION:
            g_value_set_object (
                value,
                em_folder_tree_model_get_selection (
                EM_FOLDER_TREE_MODEL (object)));
            return;

        case PROP_SESSION:
            g_value_set_object (
                value,
                em_folder_tree_model_get_session (
                EM_FOLDER_TREE_MODEL (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
folder_tree_model_dispose (GObject *object)
{
    EMFolderTreeModelPrivate *priv;

    priv = EM_FOLDER_TREE_MODEL_GET_PRIVATE (object);

    if (priv->selection != NULL) {
        g_object_weak_unref (
            G_OBJECT (priv->selection), (GWeakNotify)
            folder_tree_model_selection_finalized_cb, object);
        priv->selection = NULL;
    }

    if (priv->session != NULL) {
        g_object_unref (priv->session);
        priv->session = NULL;
    }

    if (priv->account_store != NULL) {
        g_signal_handlers_disconnect_matched (
            priv->account_store, G_SIGNAL_MATCH_DATA,
            0, 0, NULL, NULL, object);
        g_object_unref (priv->account_store);
        priv->account_store = NULL;
    }

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (parent_class)->dispose (object);
}

static void
folder_tree_model_finalize (GObject *object)
{
    EMFolderTreeModelPrivate *priv;

    priv = EM_FOLDER_TREE_MODEL_GET_PRIVATE (object);

    g_hash_table_destroy (priv->store_index);
    g_hash_table_destroy (priv->uri_index);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
folder_tree_model_constructed (GObject *object)
{
    GType col_types[] = {
        G_TYPE_STRING,   /* display name */
        G_TYPE_POINTER,  /* store object */
        G_TYPE_STRING,   /* full name */
        G_TYPE_STRING,   /* icon name */
        G_TYPE_STRING,   /* uri */
        G_TYPE_UINT,     /* unread count */
        G_TYPE_UINT,     /* flags */
        G_TYPE_BOOLEAN,  /* is a store node */
        G_TYPE_BOOLEAN,  /* is a folder node */
        G_TYPE_BOOLEAN,  /* has not-yet-loaded subfolders */
        G_TYPE_UINT,     /* last known unread count */
        G_TYPE_BOOLEAN,  /* folder is a draft folder */
        G_TYPE_UINT  /* user's sortorder */
    };

    gtk_tree_store_set_column_types (
        GTK_TREE_STORE (object), NUM_COLUMNS, col_types);
    gtk_tree_sortable_set_default_sort_func (
        GTK_TREE_SORTABLE (object),
        folder_tree_model_sort, NULL, NULL);
    gtk_tree_sortable_set_sort_column_id (
        GTK_TREE_SORTABLE (object),
        GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID,
        GTK_SORT_ASCENDING);

    /* Chain up to parent's constructed() method. */
    G_OBJECT_CLASS (parent_class)->constructed (object);
}

static void
em_folder_tree_model_class_init (EMFolderTreeModelClass *class)
{
    GObjectClass *object_class;

    parent_class = g_type_class_peek_parent (class);
    g_type_class_add_private (class, sizeof (EMFolderTreeModelPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = folder_tree_model_set_property;
    object_class->get_property = folder_tree_model_get_property;
    object_class->dispose = folder_tree_model_dispose;
    object_class->finalize = folder_tree_model_finalize;
    object_class->constructed = folder_tree_model_constructed;

    g_object_class_install_property (
        object_class,
        PROP_SESSION,
        g_param_spec_object (
            "session",
            NULL,
            NULL,
            E_TYPE_MAIL_SESSION,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_SELECTION,
        g_param_spec_object (
            "selection",
            "Selection",
            NULL,
            GTK_TYPE_TREE_SELECTION,
            G_PARAM_READWRITE));

    signals[LOADING_ROW] = g_signal_new (
        "loading-row",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_FIRST,
        G_STRUCT_OFFSET (EMFolderTreeModelClass, loading_row),
        NULL, NULL,
        e_marshal_VOID__POINTER_POINTER,
        G_TYPE_NONE, 2,
        G_TYPE_POINTER,
        G_TYPE_POINTER);

    signals[LOADED_ROW] = g_signal_new (
        "loaded-row",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_FIRST,
        G_STRUCT_OFFSET (EMFolderTreeModelClass, loaded_row),
        NULL, NULL,
        e_marshal_VOID__POINTER_POINTER,
        G_TYPE_NONE, 2,
        G_TYPE_POINTER,
        G_TYPE_POINTER);
}

static void
folder_tree_model_set_unread_count (EMFolderTreeModel *model,
                                    CamelStore *store,
                                    const gchar *full,
                                    gint unread)
{
    EMFolderTreeModelStoreInfo *si;
    GtkTreeRowReference *reference;
    GtkTreeModel *tree_model;
    GtkTreePath *path;
    GtkTreeIter parent;
    GtkTreeIter iter;
    guint old_unread = 0;

    g_return_if_fail (EM_IS_FOLDER_TREE_MODEL (model));
    g_return_if_fail (CAMEL_IS_STORE (store));
    g_return_if_fail (full != NULL);

    if (unread < 0)
        return;

    si = em_folder_tree_model_lookup_store_info (model, store);
    if (si == NULL)
        return;

    reference = g_hash_table_lookup (si->full_hash, full);
    if (!gtk_tree_row_reference_valid (reference))
        return;

    tree_model = GTK_TREE_MODEL (model);

    path = gtk_tree_row_reference_get_path (reference);
    gtk_tree_model_get_iter (tree_model, &iter, path);
    gtk_tree_path_free (path);

    gtk_tree_model_get (
        tree_model, &iter,
        COL_UINT_UNREAD_LAST_SEL, &old_unread, -1);

    gtk_tree_store_set (
        GTK_TREE_STORE (model), &iter,
        COL_UINT_UNREAD, unread,
        COL_UINT_UNREAD_LAST_SEL, MIN (old_unread, unread), -1);

    /* Folders are displayed with a bold weight to indicate that
     * they contain unread messages.  We signal that parent rows
     * have changed here to update them. */
    while (gtk_tree_model_iter_parent (tree_model, &parent, &iter)) {
        path = gtk_tree_model_get_path (tree_model, &parent);
        gtk_tree_model_row_changed (tree_model, path, &parent);
        gtk_tree_path_free (path);
        iter = parent;
    }
}

static void
em_folder_tree_model_init (EMFolderTreeModel *model)
{
    GHashTable *store_index;
    GHashTable *uri_index;

    store_index = g_hash_table_new_full (
        g_direct_hash, g_direct_equal,
        (GDestroyNotify) NULL,
        (GDestroyNotify) store_info_free);

    uri_index = g_hash_table_new_full (
        g_str_hash, g_str_equal,
        (GDestroyNotify) g_free,
        (GDestroyNotify) gtk_tree_row_reference_free);

    model->priv = EM_FOLDER_TREE_MODEL_GET_PRIVATE (model);
    model->priv->store_index = store_index;
    model->priv->uri_index = uri_index;
}

EMFolderTreeModel *
em_folder_tree_model_new (void)
{
    return g_object_new (EM_TYPE_FOLDER_TREE_MODEL, NULL);
}

EMFolderTreeModel *
em_folder_tree_model_get_default (void)
{
    static EMFolderTreeModel *default_folder_tree_model;

    if (G_UNLIKELY (default_folder_tree_model == NULL))
        default_folder_tree_model = em_folder_tree_model_new ();

    return default_folder_tree_model;
}

GtkTreeSelection *
em_folder_tree_model_get_selection (EMFolderTreeModel *model)
{
    g_return_val_if_fail (EM_IS_FOLDER_TREE_MODEL (model), NULL);

    return GTK_TREE_SELECTION (model->priv->selection);
}

void
em_folder_tree_model_set_selection (EMFolderTreeModel *model,
                                    GtkTreeSelection *selection)
{
    g_return_if_fail (EM_IS_FOLDER_TREE_MODEL (model));

    if (selection != NULL)
        g_return_if_fail (GTK_IS_TREE_SELECTION (selection));

    if (model->priv->selection != NULL) {
        g_object_weak_unref (
            G_OBJECT (model->priv->selection), (GWeakNotify)
            folder_tree_model_selection_finalized_cb, model);
        model->priv->selection = NULL;
    }

    model->priv->selection = selection;

    if (model->priv->selection != NULL)
        g_object_weak_ref (
            G_OBJECT (model->priv->selection), (GWeakNotify)
            folder_tree_model_selection_finalized_cb, model);

    g_object_notify (G_OBJECT (model), "selection");
}

EMailSession *
em_folder_tree_model_get_session (EMFolderTreeModel *model)
{
    g_return_val_if_fail (EM_IS_FOLDER_TREE_MODEL (model), NULL);

    return model->priv->session;
}

void
em_folder_tree_model_set_session (EMFolderTreeModel *model,
                                  EMailSession *session)
{
    g_return_if_fail (EM_IS_FOLDER_TREE_MODEL (model));

    if (session != NULL) {
        g_return_if_fail (E_IS_MAIL_SESSION (session));
        g_object_ref (session);
    }

    if (model->priv->session != NULL)
        g_object_unref (model->priv->session);

    model->priv->session = session;

    /* FIXME Technically we should be disconnecting this signal
     *       when replacing an old session with a new session,
     *       but at present this function is only called once. */
    if (session != NULL) {
        EMailAccountStore *account_store;
        MailFolderCache *folder_cache;

        folder_cache = e_mail_session_get_folder_cache (session);
        account_store = e_mail_session_get_account_store (session);

        /* Keep our own reference since we connect to its signals. */
        g_warn_if_fail (model->priv->account_store == NULL);
        model->priv->account_store = g_object_ref (account_store);

        /* No need to connect to "service-added" emissions since it's
         * always immediately followed by either "service-enabled" or
         * "service-disabled". */

        g_signal_connect (
            account_store, "service-removed",
            G_CALLBACK (folder_tree_model_service_removed),
            model);

        g_signal_connect (
            account_store, "service-enabled",
            G_CALLBACK (folder_tree_model_service_enabled),
            model);

        g_signal_connect (
            account_store, "service-disabled",
            G_CALLBACK (folder_tree_model_service_disabled),
            model);

        g_signal_connect (
            account_store, "services-reordered",
            G_CALLBACK (folder_tree_model_services_reordered),
            model);

        g_signal_connect_swapped (
            folder_cache, "folder-unread-updated",
            G_CALLBACK (folder_tree_model_set_unread_count),
            model);
    }

    g_object_notify (G_OBJECT (model), "session");
}

void
em_folder_tree_model_set_folder_info (EMFolderTreeModel *model,
                                      GtkTreeIter *iter,
                                      EMFolderTreeModelStoreInfo *si,
                                      CamelFolderInfo *fi,
                                      gint fully_loaded)
{
    GtkTreeRowReference *uri_row, *path_row;
    GtkTreeStore *tree_store;
    MailFolderCache *folder_cache;
    EMailSession *session;
    EAccount *account;
    guint unread;
    GtkTreePath *path;
    GtkTreeIter sub;
    CamelFolder *folder;
    gboolean emitted = FALSE;
    const gchar *uid;
    const gchar *icon_name;
    const gchar *display_name;
    guint32 flags, add_flags = 0;
    EMEventTargetCustomIcon *target;
    gboolean load = FALSE;
    gboolean folder_is_drafts = FALSE;
    gboolean folder_is_outbox = FALSE;
    gboolean folder_is_templates = FALSE;
    gboolean store_is_local;
    gchar *uri;

    /* Make sure we don't already know about it. */
    if (g_hash_table_lookup (si->full_hash, fi->full_name))
        return;

    tree_store = GTK_TREE_STORE (model);

    session = em_folder_tree_model_get_session (model);
    folder_cache = e_mail_session_get_folder_cache (session);

    uid = camel_service_get_uid (CAMEL_SERVICE (si->store));
    store_is_local = (g_strcmp0 (uid, E_MAIL_SESSION_LOCAL_UID) == 0);
    account = e_get_account_by_uid (uid);

    if (!fully_loaded)
        load = (fi->child == NULL) && !(fi->flags &
            (CAMEL_FOLDER_NOCHILDREN | CAMEL_FOLDER_NOINFERIORS));

    path = gtk_tree_model_get_path (GTK_TREE_MODEL (model), iter);
    uri_row = gtk_tree_row_reference_new (GTK_TREE_MODEL (model), path);
    path_row = gtk_tree_row_reference_copy (uri_row);
    gtk_tree_path_free (path);

    uri = e_mail_folder_uri_build (si->store, fi->full_name);

    /* Hash table takes ownership of the URI string. */
    g_hash_table_insert (
        model->priv->uri_index, uri, uri_row);
    g_hash_table_insert (
        si->full_hash, g_strdup (fi->full_name), path_row);

    /* XXX If we have the folder, and its the Outbox folder, we need
     *     the total count, not unread.  We do the same for Drafts. */

    /* XXX This is duplicated in mail-folder-cache too, should perhaps
     *     be functionised. */
    unread = fi->unread;
    if (mail_folder_cache_get_folder_from_uri (
        folder_cache, uri, &folder) && folder) {
        folder_is_drafts = em_utils_folder_is_drafts (folder);
        folder_is_outbox = em_utils_folder_is_outbox (folder);

        if (folder_is_drafts || folder_is_outbox) {
            gint total;

            if ((total = camel_folder_get_message_count (folder)) > 0) {
                gint deleted = camel_folder_get_deleted_message_count (folder);

                if (deleted != -1)
                    total -= deleted;
            }

            unread = total > 0 ? total : 0;
        }

        g_object_unref (folder);
    }

    flags = fi->flags;
    display_name = fi->display_name;

    if (store_is_local) {
        if (strcmp (fi->full_name, "Drafts") == 0) {
            folder_is_drafts = TRUE;
            display_name = _("Drafts");
        } else if (strcmp (fi->full_name, "Templates") == 0) {
            folder_is_templates = TRUE;
            display_name = _("Templates");
        } else if (strcmp (fi->full_name, "Inbox") == 0) {
            flags = (flags & ~CAMEL_FOLDER_TYPE_MASK) |
                CAMEL_FOLDER_TYPE_INBOX;
            display_name = _("Inbox");
        } else if (strcmp (fi->full_name, "Outbox") == 0) {
            flags = (flags & ~CAMEL_FOLDER_TYPE_MASK) |
                CAMEL_FOLDER_TYPE_OUTBOX;
            display_name = _("Outbox");
        } else if (strcmp (fi->full_name, "Sent") == 0) {
            flags = (flags & ~CAMEL_FOLDER_TYPE_MASK) |
                CAMEL_FOLDER_TYPE_SENT;
            display_name = _("Sent");
        }
    }

    if (account != NULL && (flags & CAMEL_FOLDER_TYPE_MASK) == 0) {
        if (!folder_is_drafts && account->drafts_folder_uri != NULL) {
            folder_is_drafts = e_mail_folder_uri_equal (
                CAMEL_SESSION (session), uri,
                account->drafts_folder_uri);
        }

        if (account->sent_folder_uri != NULL) {
            if (e_mail_folder_uri_equal (
                CAMEL_SESSION (session), uri,
                account->sent_folder_uri)) {
                add_flags = CAMEL_FOLDER_TYPE_SENT;
            }
        }
    }

    /* Choose an icon name for the folder. */
    icon_name = em_folder_utils_get_icon_name (flags | add_flags);

    if (g_str_equal (icon_name, "folder")) {
        if (folder_is_drafts)
            icon_name = "accessories-text-editor";
        else if (folder_is_templates)
            icon_name = "text-x-generic-template";
    }

    gtk_tree_store_set (
        tree_store, iter,
        COL_STRING_DISPLAY_NAME, display_name,
        COL_POINTER_CAMEL_STORE, si->store,
        COL_STRING_FULL_NAME, fi->full_name,
        COL_STRING_ICON_NAME, icon_name,
        COL_STRING_URI, uri,
        COL_UINT_FLAGS, flags,
        COL_BOOL_IS_STORE, FALSE,
        COL_BOOL_IS_FOLDER, TRUE,
        COL_BOOL_LOAD_SUBDIRS, load,
        COL_UINT_UNREAD_LAST_SEL, 0,
        COL_BOOL_IS_DRAFT, folder_is_drafts,
        -1);

    target = em_event_target_new_custom_icon (
        em_event_peek (), tree_store, iter,
        fi->full_name, EM_EVENT_CUSTOM_ICON);
    e_event_emit (
        (EEvent *) em_event_peek (), "folder.customicon",
        (EEventTarget *) target);

    if (unread != ~0)
        gtk_tree_store_set (
            tree_store, iter, COL_UINT_UNREAD, unread,
            COL_UINT_UNREAD_LAST_SEL, unread, -1);

    if (load) {
        /* create a placeholder node for our subfolders... */
        gtk_tree_store_append (tree_store, &sub, iter);
        gtk_tree_store_set (
            tree_store, &sub,
            COL_STRING_DISPLAY_NAME, _("Loading..."),
            COL_POINTER_CAMEL_STORE, si->store,
            COL_STRING_FULL_NAME, NULL,
            COL_STRING_ICON_NAME, NULL,
            COL_BOOL_LOAD_SUBDIRS, FALSE,
            COL_BOOL_IS_STORE, FALSE,
            COL_BOOL_IS_FOLDER, FALSE,
            COL_STRING_URI, NULL,
            COL_UINT_UNREAD, 0,
            COL_UINT_UNREAD_LAST_SEL, 0,
            COL_BOOL_IS_DRAFT, FALSE,
            -1);

        path = gtk_tree_model_get_path (GTK_TREE_MODEL (model), iter);
        g_signal_emit (model, signals[LOADING_ROW], 0, path, iter);
        gtk_tree_path_free (path);
        return;
    }

    if (fi->child) {
        fi = fi->child;

        do {
            gtk_tree_store_append (tree_store, &sub, iter);

            if (!emitted) {
                path = gtk_tree_model_get_path (
                    GTK_TREE_MODEL (model), iter);
                g_signal_emit (
                    model, signals[LOADED_ROW],
                    0, path, iter);
                gtk_tree_path_free (path);
                emitted = TRUE;
            }

            em_folder_tree_model_set_folder_info (
                model, &sub, si, fi, fully_loaded);
            fi = fi->next;
        } while (fi);
    }

    if (!emitted) {
        path = gtk_tree_model_get_path (GTK_TREE_MODEL (model), iter);
        g_signal_emit (model, signals[LOADED_ROW], 0, path, iter);
        gtk_tree_path_free (path);
    }
}

static void
folder_subscribed_cb (CamelStore *store,
                      CamelFolderInfo *fi,
                      EMFolderTreeModel *model)
{
    EMFolderTreeModelStoreInfo *si;
    GtkTreeRowReference *reference;
    GtkTreeIter parent, iter;
    GtkTreePath *path;
    gboolean load;
    gchar *dirname, *p;

    si = em_folder_tree_model_lookup_store_info (model, store);
    if (si == NULL)
        return;

    /* Make sure we don't already know about it? */
    if (g_hash_table_lookup (si->full_hash, fi->full_name))
        return;

    /* Get our parent folder's path. */
    dirname = g_alloca (strlen (fi->full_name) + 1);
    strcpy (dirname, fi->full_name);
    p = strrchr (dirname, '/');
    if (p == NULL) {
        /* User subscribed to a toplevel folder. */
        reference = si->row;
    } else {
        *p = 0;
        reference = g_hash_table_lookup (si->full_hash, dirname);
    }

    if (!gtk_tree_row_reference_valid (reference))
        return;

    path = gtk_tree_row_reference_get_path (reference);
    gtk_tree_model_get_iter (GTK_TREE_MODEL (model), &parent, path);
    gtk_tree_path_free (path);

    /* Make sure parent's subfolders have already been loaded. */
    gtk_tree_model_get (
        GTK_TREE_MODEL (model), &parent,
        COL_BOOL_LOAD_SUBDIRS, &load, -1);
    if (load)
        return;

    gtk_tree_store_append (GTK_TREE_STORE (model), &iter, &parent);

    em_folder_tree_model_set_folder_info (model, &iter, si, fi, TRUE);
}

static void
folder_unsubscribed_cb (CamelStore *store,
                        CamelFolderInfo *fi,
                        EMFolderTreeModel *model)
{
    EMFolderTreeModelStoreInfo *si;
    GtkTreeRowReference *reference;
    GtkTreePath *path;
    GtkTreeIter iter;

    si = em_folder_tree_model_lookup_store_info (model, store);
    if (si == NULL)
        return;

    reference = g_hash_table_lookup (si->full_hash, fi->full_name);
    if (!gtk_tree_row_reference_valid (reference))
        return;

    path = gtk_tree_row_reference_get_path (reference);
    gtk_tree_model_get_iter (GTK_TREE_MODEL (model), &iter, path);
    gtk_tree_path_free (path);

    em_folder_tree_model_remove_folders (model, si, &iter);
}

static void
folder_created_cb (CamelStore *store,
                   CamelFolderInfo *fi,
                   EMFolderTreeModel *model)
{
    EMFolderTreeModelStoreInfo *si;

    /* We only want created events to do more
     * work if we don't support subscriptions. */
    if (CAMEL_IS_SUBSCRIBABLE (store))
        return;

    /* process "folder-created" event only when store already loaded */
    si = em_folder_tree_model_lookup_store_info (model, store);
    if (si == NULL || g_hash_table_size (si->full_hash) == 0)
        return;

    folder_subscribed_cb (store, fi, model);
}

static void
folder_deleted_cb (CamelStore *store,
                   CamelFolderInfo *fi,
                   EMFolderTreeModel *model)
{
    /* We only want deleted events to do more
     * work if we don't support subscriptions. */
    if (CAMEL_IS_SUBSCRIBABLE (store))
        return;

    folder_unsubscribed_cb (store, fi, model);
}

typedef struct {
    gchar *old_base;
    CamelFolderInfo *new;
} RenameInfo;

static void
folder_renamed_cb (CamelStore *store,
                   const gchar *old_name,
                   CamelFolderInfo *info,
                   EMFolderTreeModel *model)
{
    EMFolderTreeModelStoreInfo *si;
    GtkTreeRowReference *reference;
    GtkTreeIter root, iter;
    GtkTreePath *path;
    gchar *parent, *p;

    si = em_folder_tree_model_lookup_store_info (model, store);
    if (si == NULL)
        return;

    reference = g_hash_table_lookup (si->full_hash, old_name);
    if (!gtk_tree_row_reference_valid (reference))
        return;

    path = gtk_tree_row_reference_get_path (reference);
    gtk_tree_model_get_iter (GTK_TREE_MODEL (model), &iter, path);
    gtk_tree_path_free (path);

    em_folder_tree_model_remove_folders (model, si, &iter);

    parent = g_strdup (info->full_name);
    p = strrchr (parent, '/');
    if (p)
        *p = 0;
    if (p == NULL || parent == p)
        /* renamed to a toplevel folder on the store */
        reference = si->row;
    else
        reference = g_hash_table_lookup (si->full_hash, parent);

    g_free (parent);

    if (!gtk_tree_row_reference_valid (reference))
        return;

    path = gtk_tree_row_reference_get_path (reference);
    gtk_tree_model_get_iter (GTK_TREE_MODEL (model), &root, path);
    gtk_tree_path_free (path);

    gtk_tree_store_append (GTK_TREE_STORE (model), &iter, &root);
    em_folder_tree_model_set_folder_info (model, &iter, si, info, TRUE);
}

void
em_folder_tree_model_add_store (EMFolderTreeModel *model,
                                CamelStore *store)
{
    EMFolderTreeModelStoreInfo *si;
    GtkTreeRowReference *reference;
    GtkTreeStore *tree_store;
    GtkTreeIter root, iter;
    GtkTreePath *path;
    CamelService *service;
    CamelProvider *provider;
    CamelURL *service_url;
    const gchar *display_name;
    gchar *uri;

    g_return_if_fail (EM_IS_FOLDER_TREE_MODEL (model));
    g_return_if_fail (CAMEL_IS_STORE (store));

    tree_store = GTK_TREE_STORE (model);

    service = CAMEL_SERVICE (store);
    provider = camel_service_get_provider (service);
    display_name = camel_service_get_display_name (service);

    /* Ignore stores that should not be added to the tree model. */

    if (provider == NULL)
        return;

    if ((provider->flags & CAMEL_PROVIDER_IS_STORAGE) == 0)
        return;

    service_url = camel_service_new_camel_url (service);
    if (em_utils_is_local_delivery_mbox_file (service_url)) {
        camel_url_free (service_url);
        return;
    }
    uri = camel_url_to_string (service_url, CAMEL_URL_HIDE_ALL);
    camel_url_free (service_url);

    si = em_folder_tree_model_lookup_store_info (model, store);
    if (si != NULL)
        em_folder_tree_model_remove_store (model, store);

    /* Add the store to the tree. */
    gtk_tree_store_append (tree_store, &iter, NULL);
    gtk_tree_store_set (
        tree_store, &iter,
        COL_STRING_DISPLAY_NAME, display_name,
        COL_POINTER_CAMEL_STORE, store,
        COL_STRING_FULL_NAME, NULL,
        COL_BOOL_LOAD_SUBDIRS, TRUE,
        COL_BOOL_IS_STORE, TRUE,
        COL_STRING_URI, uri,
        -1);

    path = gtk_tree_model_get_path (GTK_TREE_MODEL (model), &iter);
    reference = gtk_tree_row_reference_new (GTK_TREE_MODEL (model), path);

    si = g_new0 (EMFolderTreeModelStoreInfo, 1);
    si->store = g_object_ref (store);
    si->row = gtk_tree_row_reference_copy (reference);
    si->full_hash = g_hash_table_new_full (
        g_str_hash, g_str_equal,
        (GDestroyNotify) g_free,
        (GDestroyNotify) gtk_tree_row_reference_free);
    g_hash_table_insert (model->priv->store_index, store, si);

    /* Transfer ownership of the URI and GtkTreeRowReference. */
    g_hash_table_insert (model->priv->uri_index, uri, reference);

    /* Each store has folders, but we don't load them until
     * the user demands them. */
    root = iter;
    gtk_tree_store_append (tree_store, &iter, &root);
    gtk_tree_store_set (
        tree_store, &iter,
        COL_STRING_DISPLAY_NAME, _("Loading..."),
        COL_POINTER_CAMEL_STORE, store,
        COL_STRING_FULL_NAME, NULL,
        COL_BOOL_LOAD_SUBDIRS, FALSE,
        COL_BOOL_IS_STORE, FALSE,
        COL_BOOL_IS_FOLDER, FALSE,
        COL_STRING_URI, NULL,
        COL_UINT_UNREAD, 0,
        COL_UINT_UNREAD_LAST_SEL, 0,
        COL_BOOL_IS_DRAFT, FALSE,
        -1);

    /* Listen to store events. */
    si->created_id = g_signal_connect (
        store, "folder-created",
        G_CALLBACK (folder_created_cb), model);
    si->deleted_id = g_signal_connect (
        store, "folder-deleted",
        G_CALLBACK (folder_deleted_cb), model);
    si->renamed_id = g_signal_connect (
        store, "folder_renamed",
        G_CALLBACK (folder_renamed_cb), model);
    if (CAMEL_IS_SUBSCRIBABLE (store)) {
        si->subscribed_id = g_signal_connect (
            store, "folder_subscribed",
            G_CALLBACK (folder_subscribed_cb), model);
        si->unsubscribed_id = g_signal_connect (
            store, "folder_unsubscribed",
            G_CALLBACK (folder_unsubscribed_cb), model);
    }

    g_signal_emit (model, signals[LOADED_ROW], 0, path, &root);
    gtk_tree_path_free (path);
}

void
em_folder_tree_model_remove_store (EMFolderTreeModel *model,
                                   CamelStore *store)
{
    EMFolderTreeModelStoreInfo *si;
    GtkTreePath *path;
    GtkTreeIter iter;

    g_return_if_fail (EM_IS_FOLDER_TREE_MODEL (model));
    g_return_if_fail (CAMEL_IS_STORE (store));

    si = em_folder_tree_model_lookup_store_info (model, store);
    if (si == NULL)
        return;

    path = gtk_tree_row_reference_get_path (si->row);
    gtk_tree_model_get_iter (GTK_TREE_MODEL (model), &iter, path);
    gtk_tree_path_free (path);

    /* recursively remove subfolders and finally the toplevel store */
    em_folder_tree_model_remove_folders (model, si, &iter);
}

GList *
em_folder_tree_model_list_stores (EMFolderTreeModel *model)
{
    g_return_val_if_fail (EM_IS_FOLDER_TREE_MODEL (model), NULL);

    return g_hash_table_get_keys (model->priv->store_index);
}

void
em_folder_tree_model_remove_folders (EMFolderTreeModel *model,
                                     EMFolderTreeModelStoreInfo *si,
                                     GtkTreeIter *toplevel)
{
    gchar *uri, *full_name;
    gboolean is_store, go;
    GtkTreeIter iter;

    if (gtk_tree_model_iter_children (GTK_TREE_MODEL (model), &iter, toplevel)) {
        do {
            GtkTreeIter next = iter;

            go = gtk_tree_model_iter_next (GTK_TREE_MODEL (model), &next);
            em_folder_tree_model_remove_folders (model, si, &iter);
            iter = next;
        } while (go);
    }

    gtk_tree_model_get (
        GTK_TREE_MODEL (model), toplevel,
        COL_STRING_URI, &uri,
        COL_STRING_FULL_NAME, &full_name,
        COL_BOOL_IS_STORE, &is_store, -1);

    if (full_name != NULL)
        g_hash_table_remove (si->full_hash, full_name);

    if (uri != NULL)
        g_hash_table_remove (model->priv->uri_index, uri);

    gtk_tree_store_remove ((GtkTreeStore *) model, toplevel);

    /* Freeing the GtkTreeRowReference in the store info may finalize
     * the model.  Keep the model alive until the store info is fully
     * removed from the hash table. */
    if (is_store) {
        g_object_ref (model);
        g_hash_table_remove (model->priv->store_index, si->store);
        g_object_unref (model);
    }

    g_free (full_name);
    g_free (uri);
}

gboolean
em_folder_tree_model_is_type_inbox (EMFolderTreeModel *model,
                                    CamelStore *store,
                                    const gchar *full)
{
    EMFolderTreeModelStoreInfo *si;
    GtkTreeRowReference *reference;
    GtkTreePath *path;
    GtkTreeIter iter;
    guint32 flags;

    g_return_val_if_fail (EM_IS_FOLDER_TREE_MODEL (model), FALSE);
    g_return_val_if_fail (CAMEL_IS_STORE (store), FALSE);
    g_return_val_if_fail (full != NULL, FALSE);

    si = em_folder_tree_model_lookup_store_info (model, store);
    if (si == NULL)
        return FALSE;

    reference = g_hash_table_lookup (si->full_hash, full);
    if (!gtk_tree_row_reference_valid (reference))
        return FALSE;

    path = gtk_tree_row_reference_get_path (reference);
    gtk_tree_model_get_iter (GTK_TREE_MODEL (model), &iter, path);
    gtk_tree_path_free (path);

    gtk_tree_model_get (
        GTK_TREE_MODEL (model), &iter,
        COL_UINT_FLAGS, &flags, -1);

    return ((flags & CAMEL_FOLDER_TYPE_MASK) == CAMEL_FOLDER_TYPE_INBOX);
}

gchar *
em_folder_tree_model_get_folder_name (EMFolderTreeModel *model,
                                      CamelStore *store,
                                      const gchar *full)
{
    EMFolderTreeModelStoreInfo *si;
    GtkTreeRowReference *reference;
    GtkTreePath *path;
    GtkTreeIter iter;
    gchar *name = NULL;

    g_return_val_if_fail (EM_IS_FOLDER_TREE_MODEL (model), NULL);
    g_return_val_if_fail (CAMEL_IS_STORE (store), NULL);
    g_return_val_if_fail (full != NULL, NULL);

    si = em_folder_tree_model_lookup_store_info (model, store);
    if (si == NULL)
        return NULL;

    reference = g_hash_table_lookup (si->full_hash, full);
    if (!gtk_tree_row_reference_valid (reference))
        return NULL;

    path = gtk_tree_row_reference_get_path (reference);
    gtk_tree_model_get_iter (GTK_TREE_MODEL (model), &iter, path);
    gtk_tree_path_free (path);

    gtk_tree_model_get (
        GTK_TREE_MODEL (model), &iter,
        COL_STRING_DISPLAY_NAME, &name, -1);

    return name;
}

EMFolderTreeModelStoreInfo *
em_folder_tree_model_lookup_store_info (EMFolderTreeModel *model,
                                        CamelStore *store)
{
    g_return_val_if_fail (EM_IS_FOLDER_TREE_MODEL (model), NULL);
    g_return_val_if_fail (CAMEL_IS_STORE (store), NULL);

    return g_hash_table_lookup (model->priv->store_index, store);
}

GtkTreeRowReference *
em_folder_tree_model_lookup_uri (EMFolderTreeModel *model,
                                 const gchar *folder_uri)
{
    GtkTreeRowReference *reference;

    g_return_val_if_fail (EM_IS_FOLDER_TREE_MODEL (model), NULL);
    g_return_val_if_fail (folder_uri != NULL, NULL);

    reference = g_hash_table_lookup (model->priv->uri_index, folder_uri);

    return gtk_tree_row_reference_valid (reference) ? reference : NULL;
}

void
em_folder_tree_model_user_marked_unread (EMFolderTreeModel *model,
                                         CamelFolder *folder,
                                         guint n_marked)
{
    GtkTreeRowReference *reference;
    GtkTreePath *path;
    GtkTreeIter iter;
    gchar *folder_uri;
    guint unread;

    /* The user marked messages in the given folder as unread.
     * Update our unread counts so we don't misinterpret this
     * event as new mail arriving. */

    g_return_if_fail (EM_IS_FOLDER_TREE_MODEL (model));
    g_return_if_fail (CAMEL_IS_FOLDER (folder));

    folder_uri = e_mail_folder_uri_from_folder (folder);
    reference = em_folder_tree_model_lookup_uri (model, folder_uri);
    g_free (folder_uri);

    g_return_if_fail (gtk_tree_row_reference_valid (reference));

    path = gtk_tree_row_reference_get_path (reference);
    gtk_tree_model_get_iter (GTK_TREE_MODEL (model), &iter, path);
    gtk_tree_path_free (path);

    gtk_tree_model_get (
        GTK_TREE_MODEL (model), &iter,
        COL_UINT_UNREAD, &unread, -1);

    unread += n_marked;

    gtk_tree_store_set (
        GTK_TREE_STORE (model), &iter,
        COL_UINT_UNREAD_LAST_SEL, unread,
        COL_UINT_UNREAD, unread, -1);
}