path: root/libemail-utils/e-signature-list.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 "e-signature-list.h"

#include <string.h>

#include <libedataserver/e-uid.h>

#define E_SIGNATURE_LIST_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_SIGNATURE_LIST, ESignatureListPrivate))

struct _ESignatureListPrivate {
    GConfClient *gconf;
    guint notify_id;
    gboolean resave;
};

enum {
    SIGNATURE_ADDED,
    SIGNATURE_CHANGED,
    SIGNATURE_REMOVED,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };

G_DEFINE_TYPE (
    ESignatureList,
    e_signature_list,
    E_TYPE_LIST)

static void
e_signature_list_dispose (GObject *object)
{
    ESignatureList *list = (ESignatureList *) object;

    if (list->priv->gconf) {
        if (list->priv->notify_id != 0)
            gconf_client_notify_remove (
                list->priv->gconf, list->priv->notify_id);
        g_object_unref (list->priv->gconf);
        list->priv->gconf = NULL;
    }

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

static void
e_signature_list_class_init (ESignatureListClass *class)
{
    GObjectClass *object_class;

    g_type_class_add_private (class, sizeof (ESignatureListPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->dispose = e_signature_list_dispose;

    signals[SIGNATURE_ADDED] = g_signal_new (
        "signature-added",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ESignatureListClass, signature_added),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_SIGNATURE);

    signals[SIGNATURE_CHANGED] = g_signal_new (
        "signature-changed",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ESignatureListClass, signature_changed),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_SIGNATURE);

    signals[SIGNATURE_REMOVED] = g_signal_new (
        "signature-removed",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ESignatureListClass, signature_removed),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_SIGNATURE);
}

static void
e_signature_list_init (ESignatureList *signature_list)
{
    signature_list->priv = E_SIGNATURE_LIST_GET_PRIVATE (signature_list);
}

static GSList *
add_autogen (ESignatureList *list,
             GSList *new_sigs)
{
    ESignature *autogen;

    autogen = e_signature_new ();
    e_signature_set_autogenerated (autogen, TRUE);

    e_list_append (E_LIST (list), autogen);

    return g_slist_prepend (new_sigs, autogen);
}

static void
gconf_signatures_changed (GConfClient *client,
                          guint cnxn_id,
                          GConfEntry *entry,
                          gpointer user_data)
{
    ESignatureList *signature_list = user_data;
    GSList *list, *l, *n, *new_sigs = NULL;
    gboolean have_autogen = FALSE;
    gboolean resave = FALSE;
    ESignature *signature;
    EList *old_sigs;
    EIterator *iter;
    gboolean found;
    gchar *uid;

    old_sigs = e_list_duplicate (E_LIST (signature_list));

    list = gconf_client_get_list (
        client, "/apps/evolution/mail/signatures",
        GCONF_VALUE_STRING, NULL);
    for (l = list; l; l = l->next) {
        found = FALSE;
        if ((uid = e_signature_uid_from_xml (l->data))) {
            /* See if this is an existing signature */
            iter = e_list_get_iterator (old_sigs);
            while (e_iterator_is_valid (iter)) {
                const gchar *signature_uid;

                signature = (ESignature *) e_iterator_get (iter);
                signature_uid = e_signature_get_uid (signature);
                if (!strcmp (signature_uid, uid)) {
                    /* The signature still exists, so remove
                     * it from "old_sigs" and update it. */
                    found = TRUE;
                    e_iterator_delete (iter);
                    if (e_signature_set_from_xml (
                            signature, l->data))
                        g_signal_emit (
                            signature_list,
                            signals[SIGNATURE_CHANGED],
                            0, signature);

                    have_autogen |=
                        e_signature_get_autogenerated (
                        signature);

                    break;
                }

                e_iterator_next (iter);
            }

            g_object_unref (iter);
        }

        if (!found) {
            resave = TRUE;

            /* Must be a new signature */
            signature = e_signature_new_from_xml (l->data);
            if (signature) {
                have_autogen |=
                    e_signature_get_autogenerated (signature);

                e_list_append (E_LIST (signature_list), signature);
                new_sigs = g_slist_prepend (new_sigs, signature);
            }
        }

        g_free (uid);
    }

    g_slist_foreach (list, (GFunc) g_free, NULL);
    g_slist_free (list);

    if (!have_autogen) {
        new_sigs = add_autogen (signature_list, new_sigs);
        resave = TRUE;
    }

    if (new_sigs != NULL) {
        /* Now emit signals for each added signature. */
        l = g_slist_reverse (new_sigs);
        while (l != NULL) {
            n = l->next;
            signature = l->data;
            g_signal_emit (
                signature_list,
                signals[SIGNATURE_ADDED], 0,
                signature);
            g_object_unref (signature);
            g_slist_free_1 (l);
            l = n;
        }
    }

    /* Anything left in old_sigs must have been deleted */
    iter = e_list_get_iterator (old_sigs);
    while (e_iterator_is_valid (iter)) {
        signature = (ESignature *) e_iterator_get (iter);
        e_list_remove (E_LIST (signature_list), signature);
        g_signal_emit (
            signature_list, signals[SIGNATURE_REMOVED], 0,
            signature);
        e_iterator_next (iter);
    }

    g_object_unref (iter);
    g_object_unref (old_sigs);

    signature_list->priv->resave = resave;
}

static gpointer
copy_func (gconstpointer data,
           gpointer closure)
{
    GObject *object = (GObject *) data;

    g_object_ref (object);

    return object;
}

static void
free_func (gpointer data,
           gpointer closure)
{
    g_object_unref (data);
}

/**
 * e_signature_list_new:
 *
 * Reads the list of signaturess from @gconf and listens for changes.
 * Will emit #signature_added, #signature_changed, and #signature_removed
 * signals according to notifications from GConf.
 *
 * You can modify the list using e_list_append(), e_list_remove(), and
 * e_iterator_delete(). After adding, removing, or changing accounts,
 * you must call e_signature_list_save() to push the changes back to
 * GConf.
 *
 * Return value: the list of signatures
 **/
ESignatureList *
e_signature_list_new (void)
{
    ESignatureList *signature_list;
    GConfClient *client;

    signature_list = g_object_new (E_TYPE_SIGNATURE_LIST, NULL);

    client = gconf_client_get_default ();
    e_signature_list_construct (signature_list, client);
    g_object_unref (client);

    return signature_list;
}

void
e_signature_list_construct (ESignatureList *signature_list,
                            GConfClient *gconf)
{
    g_return_if_fail (GCONF_IS_CLIENT (gconf));

    e_list_construct (E_LIST (signature_list), copy_func, free_func, NULL);
    signature_list->priv->gconf = gconf;
    g_object_ref (gconf);

    gconf_client_add_dir (signature_list->priv->gconf,
                  "/apps/evolution/mail/signatures",
                  GCONF_CLIENT_PRELOAD_ONELEVEL, NULL);

    signature_list->priv->notify_id =
        gconf_client_notify_add (signature_list->priv->gconf,
                     "/apps/evolution/mail/signatures",
                     gconf_signatures_changed, signature_list,
                     NULL, NULL);

    gconf_signatures_changed (signature_list->priv->gconf,
                  signature_list->priv->notify_id,
                  NULL, signature_list);

    if (signature_list->priv->resave) {
        e_signature_list_save (signature_list);
        signature_list->priv->resave = FALSE;
    }
}

/**
 * e_signature_list_save:
 * @signature_list: an #ESignatureList
 *
 * Saves @signature_list to GConf. Signals will be emitted for changes.
 **/
void
e_signature_list_save (ESignatureList *signature_list)
{
    GSList *list = NULL;
    ESignature *signature;
    EIterator *iter;
    gchar *xmlbuf;

    for (iter = e_list_get_iterator (E_LIST (signature_list));
         e_iterator_is_valid (iter);
         e_iterator_next (iter)) {
        signature = (ESignature *) e_iterator_get (iter);

        if ((xmlbuf = e_signature_to_xml (signature)))
            list = g_slist_append (list, xmlbuf);
    }

    g_object_unref (iter);

    gconf_client_set_list (signature_list->priv->gconf,
                   "/apps/evolution/mail/signatures",
                   GCONF_VALUE_STRING, list, NULL);

    while (list) {
        g_free (list->data);
        list = g_slist_remove (list, list->data);
    }

    gconf_client_suggest_sync (signature_list->priv->gconf, NULL);
}

/**
 * e_signature_list_add:
 * @signature_list: signature list
 * @signature: signature to add
 *
 * Add an signature to the signature list.  Will emit the signature-changed
 * event.
 **/
void
e_signature_list_add (ESignatureList *signature_list,
                      ESignature *signature)
{
    e_list_append ((EList *) signature_list, signature);
    g_signal_emit (signature_list, signals[SIGNATURE_ADDED], 0, signature);
}

/**
 * e_signature_list_change:
 * @signature_list: signature list
 * @signature: signature to change
 *
 * Signal that the details of an signature have changed.
 **/
void
e_signature_list_change (ESignatureList *signature_list,
                         ESignature *signature)
{
    /* maybe the signature should do this itself ... */
    g_signal_emit (signature_list, signals[SIGNATURE_CHANGED], 0, signature);
}

/**
 * e_signature_list_remove:
 * @signature_list: signature list
 * @signature: signature
 *
 * Remove an signature from the signature list, and emit the
 * signature-removed signal.  If the signature was the default signature,
 * then reset the default to the first signature.
 **/
void
e_signature_list_remove (ESignatureList *signature_list,
                         ESignature *signature)
{
    /* not sure if need to ref but no harm */
    g_object_ref (signature);
    e_list_remove ((EList *) signature_list, signature);
    g_signal_emit (signature_list, signals[SIGNATURE_REMOVED], 0, signature);
    g_object_unref (signature);
}

/**
 * e_signature_list_find_by_name:
 * @signature_list: an #ESignatureList
 * @name: the signature name to find
 *
 * Searches @signature_list for the given signature name.
 *
 * Returns: the matching signature or %NULL if it doesn't exist
 **/
ESignature *
e_signature_list_find_by_name (ESignatureList *signature_list,
                               const gchar *signature_name)
{
    ESignature *signature = NULL;
    EIterator *it;

    g_return_val_if_fail (E_IS_SIGNATURE_LIST (signature_list), NULL);

    /* this could use a callback for more flexibility ...
     * ... but this makes the common cases easier */

    if (signature_name == NULL)
        return NULL;

    for (it = e_list_get_iterator (E_LIST (signature_list));
         e_iterator_is_valid (it);
         e_iterator_next (it)) {
        const gchar *value;

        /* XXX EIterator misuses const. */
        signature = (ESignature *) e_iterator_get (it);
        value = e_signature_get_name (signature);

        if (g_strcmp0 (value, signature_name) == 0)
            break;

        signature = NULL;
    }

    g_object_unref (it);

    return signature;
}

/**
 * e_signature_list_find_by_uid:
 * @signature_list: an #ESignatureList
 * @name: the signature UID to find
 *
 * Searches @signature_list for the given signature UID.
 *
 * Returns: the matching signature or %NULL if it doesn't exist
 **/
ESignature *
e_signature_list_find_by_uid (ESignatureList *signature_list,
                              const gchar *signature_uid)
{
    ESignature *signature = NULL;
    EIterator *it;

    g_return_val_if_fail (E_IS_SIGNATURE_LIST (signature_list), NULL);

    /* this could use a callback for more flexibility ...
     * ... but this makes the common cases easier */

    if (signature_uid == NULL)
        return NULL;

    for (it = e_list_get_iterator (E_LIST (signature_list));
         e_iterator_is_valid (it);
         e_iterator_next (it)) {
        const gchar *value = NULL;

        /* XXX EIterator misuses const. */
        signature = (ESignature *) e_iterator_get (it);
        value = e_signature_get_uid (signature);

        if (g_strcmp0 (value, signature_uid) == 0)
            break;

        signature = NULL;
    }

    g_object_unref (it);

    return signature;
}