path: root/mail/e-mail-reader-utils.c

/*
 * e-mail-reader-utils.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/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

/* Miscellaneous utility functions used by EMailReader actions. */

#include "e-mail-reader-utils.h"

#include <glib/gi18n.h>
#include <libxml/tree.h>
#include <gtkhtml/gtkhtml.h>
#include <camel/camel.h>

#include "e-util/e-alert-dialog.h"
#include "filter/e-filter-rule.h"
#include "misc/e-web-view.h"

#include "mail/e-mail-backend.h"
#include "mail/e-mail-browser.h"
#include "mail/e-mail-folder-utils.h"
#include "mail/em-composer-utils.h"
#include "mail/em-format-html-print.h"
#include "mail/em-utils.h"
#include "mail/mail-autofilter.h"
#include "mail/mail-ops.h"
#include "mail/mail-tools.h"
#include "mail/mail-vfolder.h"
#include "mail/message-list.h"

typedef struct _AsyncContext AsyncContext;

struct _AsyncContext {
    EActivity *activity;
    EMailReader *reader;
};

static void
async_context_free (AsyncContext *context)
{
    if (context->activity != NULL)
        g_object_unref (context->activity);

    if (context->reader != NULL)
        g_object_unref (context->reader);

    g_slice_free (AsyncContext, context);
}

void
e_mail_reader_activate (EMailReader *reader,
                        const gchar *action_name)
{
    GtkActionGroup *action_group;
    GtkAction *action;

    g_return_if_fail (E_IS_MAIL_READER (reader));
    g_return_if_fail (action_name != NULL);

    action_group = e_mail_reader_get_action_group (reader);
    action = gtk_action_group_get_action (action_group, action_name);
    g_return_if_fail (action != NULL);

    gtk_action_activate (action);
}

gboolean
e_mail_reader_confirm_delete (EMailReader *reader)
{
    EShell *shell;
    EMailBackend *backend;
    EShellBackend *shell_backend;
    EShellSettings *shell_settings;
    CamelFolder *folder;
    CamelStore *parent_store;
    GtkWidget *check_button;
    GtkWidget *container;
    GtkWidget *dialog;
    GtkWindow *window;
    const gchar *label;
    gboolean prompt_delete_in_vfolder;
    gint response;

    /* Remind users what deleting from a search folder does. */

    g_return_val_if_fail (E_IS_MAIL_READER (reader), FALSE);

    backend = e_mail_reader_get_backend (reader);
    folder = e_mail_reader_get_folder (reader);
    window = e_mail_reader_get_window (reader);

    shell_backend = E_SHELL_BACKEND (backend);
    shell = e_shell_backend_get_shell (shell_backend);
    shell_settings = e_shell_get_shell_settings (shell);

    prompt_delete_in_vfolder = e_shell_settings_get_boolean (
        shell_settings, "mail-prompt-delete-in-vfolder");

    parent_store = camel_folder_get_parent_store (folder);

    if (!CAMEL_IS_VEE_STORE (parent_store))
        return TRUE;

    if (!prompt_delete_in_vfolder)
        return TRUE;

    dialog = e_alert_dialog_new_for_args (
        window, "mail:ask-delete-vfolder-msg",
        camel_folder_get_full_name (folder), NULL);

    container = e_alert_dialog_get_content_area (E_ALERT_DIALOG (dialog));

    label = _("Do not warn me again");
    check_button = gtk_check_button_new_with_label (label);
    gtk_box_pack_start (GTK_BOX (container), check_button, TRUE, TRUE, 6);
    gtk_widget_show (check_button);

    response = gtk_dialog_run (GTK_DIALOG (dialog));

    if (response != GTK_RESPONSE_DELETE_EVENT)
        e_shell_settings_set_boolean (
            shell_settings,
            "mail-prompt-delete-in-vfolder",
            !gtk_toggle_button_get_active (
            GTK_TOGGLE_BUTTON (check_button)));

    gtk_widget_destroy (dialog);

    return (response == GTK_RESPONSE_OK);
}

void
e_mail_reader_mark_as_read (EMailReader *reader,
                            const gchar *uid)
{
    EMailBackend *backend;
    EMailSession *session;
    EMFormatHTML *formatter;
    CamelFolder *folder;
    guint32 mask, set;
    guint32 flags;

    g_return_if_fail (E_IS_MAIL_READER (reader));
    g_return_if_fail (uid != NULL);

    folder = e_mail_reader_get_folder (reader);
    backend = e_mail_reader_get_backend (reader);
    formatter = e_mail_reader_get_formatter (reader);

    session = e_mail_backend_get_session (backend);

    flags = camel_folder_get_message_flags (folder, uid);

    if (!(flags & CAMEL_MESSAGE_SEEN)) {
        CamelMimeMessage *message;

        message = EM_FORMAT (formatter)->message;
        em_utils_handle_receipt (session, folder, uid, message);
    }

    mask = CAMEL_MESSAGE_SEEN;
    set  = CAMEL_MESSAGE_SEEN;

    camel_folder_set_message_flags (folder, uid, mask, set);
}

guint
e_mail_reader_mark_selected (EMailReader *reader,
                             guint32 mask,
                             guint32 set)
{
    CamelFolder *folder;
    GPtrArray *uids;
    guint ii;

    g_return_val_if_fail (E_IS_MAIL_READER (reader), 0);

    folder = e_mail_reader_get_folder (reader);

    if (folder == NULL)
        return 0;

    camel_folder_freeze (folder);
    uids = e_mail_reader_get_selected_uids (reader);

    for (ii = 0; ii < uids->len; ii++)
        camel_folder_set_message_flags (
            folder, uids->pdata[ii], mask, set);

    em_utils_uids_free (uids);

    camel_folder_thaw (folder);

    return ii;
}
static void
copy_tree_state (EMailReader *src_reader, EMailReader *des_reader)
{
    GtkWidget *src_mlist, *des_mlist;
    gchar *state;

    g_return_if_fail (src_reader != NULL);
    g_return_if_fail (des_reader != NULL);

    src_mlist = e_mail_reader_get_message_list (src_reader);
    if (!src_mlist)
        return;

    des_mlist = e_mail_reader_get_message_list (des_reader);
    if (!des_mlist)
        return;

    state = e_tree_get_state (E_TREE (src_mlist));
    if (state)
        e_tree_set_state (E_TREE (des_mlist), state);
    g_free (state);
}

guint
e_mail_reader_open_selected (EMailReader *reader)
{
    EMailBackend *backend;
    CamelFolder *folder;
    GtkWindow *window;
    GPtrArray *views;
    GPtrArray *uids;
    guint ii;

    g_return_val_if_fail (E_IS_MAIL_READER (reader), 0);

    backend = e_mail_reader_get_backend (reader);
    folder = e_mail_reader_get_folder (reader);
    uids = e_mail_reader_get_selected_uids (reader);
    window = e_mail_reader_get_window (reader);

    if (!em_utils_ask_open_many (window, uids->len)) {
        em_utils_uids_free (uids);
        return 0;
    }

    if (em_utils_folder_is_drafts (folder) ||
        em_utils_folder_is_outbox (folder) ||
        em_utils_folder_is_templates (folder)) {
        em_utils_edit_messages (reader, folder, uids, TRUE);
        return uids->len;
    }

    views = g_ptr_array_new ();

    /* For vfolders we need to edit the original, not the vfolder copy. */
    for (ii = 0; ii < uids->len; ii++) {
        const gchar *uid = uids->pdata[ii];
        CamelFolder *real_folder;
        CamelMessageInfo *info;
        gchar *real_uid;

        if (!CAMEL_IS_VEE_FOLDER (folder)) {
            g_ptr_array_add (views, g_strdup (uid));
            continue;
        }

        info = camel_folder_get_message_info (folder, uid);
        if (info == NULL)
            continue;

        real_folder = camel_vee_folder_get_location (
            CAMEL_VEE_FOLDER (folder),
            (CamelVeeMessageInfo *) info, &real_uid);

        if (em_utils_folder_is_drafts (real_folder) ||
            em_utils_folder_is_outbox (real_folder)) {
            GPtrArray *edits;

            edits = g_ptr_array_new ();
            g_ptr_array_add (edits, real_uid);
            em_utils_edit_messages (
                reader, real_folder, edits, TRUE);
        } else {
            g_free (real_uid);
            g_ptr_array_add (views, g_strdup (uid));
        }

        camel_folder_free_message_info (folder, info);
    }

    for (ii = 0; ii < views->len; ii++) {
        const gchar *uid = views->pdata[ii];
        GtkWidget *browser;

        browser = e_mail_browser_new (backend);
        e_mail_reader_set_folder (E_MAIL_READER (browser), folder);
        e_mail_reader_set_message (E_MAIL_READER (browser), uid);
        copy_tree_state (reader, E_MAIL_READER (browser));
        e_mail_reader_set_group_by_threads (
            E_MAIL_READER (browser),
            e_mail_reader_get_group_by_threads (reader));
        gtk_widget_show (browser);
    }

    g_ptr_array_foreach (views, (GFunc) g_free, NULL);
    g_ptr_array_free (views, TRUE);

    em_utils_uids_free (uids);

    return ii;
}

void
e_mail_reader_print (EMailReader *reader,
                     GtkPrintOperationAction action)
{
    EMFormatHTML *formatter;
    EMFormatHTMLPrint *html_print;
    CamelFolder *folder;
    GPtrArray *uids;

    g_return_if_fail (E_IS_MAIL_READER (reader));

    folder = e_mail_reader_get_folder (reader);
    g_return_if_fail (folder != NULL);

    /* XXX Learn to handle len > 1. */
    uids = e_mail_reader_get_selected_uids (reader);
    if (uids->len != 1)
        goto exit;

    formatter = e_mail_reader_get_formatter (reader);

    html_print = em_format_html_print_new (formatter, action);
    em_format_merge_handler (
        EM_FORMAT (html_print), EM_FORMAT (formatter));
    em_format_html_print_message (html_print, folder, uids->pdata[0]);
    g_object_unref (html_print);

exit:
    em_utils_uids_free (uids);
}

static void
mail_reader_remove_duplicates_cb (CamelFolder *folder,
                                  GAsyncResult *result,
                                  AsyncContext *context)
{
    EAlertSink *alert_sink;
    GHashTable *duplicates;
    GtkWindow *parent_window;
    guint n_duplicates;
    GError *error = NULL;

    alert_sink = e_mail_reader_get_alert_sink (context->reader);
    parent_window = e_mail_reader_get_window (context->reader);

    duplicates = e_mail_folder_find_duplicate_messages_finish (
        folder, result, &error);

    if (e_activity_handle_cancellation (context->activity, error)) {
        g_warn_if_fail (duplicates == NULL);
        async_context_free (context);
        g_error_free (error);
        return;

    } else if (error != NULL) {
        g_warn_if_fail (duplicates == NULL);
        e_alert_submit (
            alert_sink,
            "mail:find-duplicate-messages",
            error->message, NULL);
        async_context_free (context);
        g_error_free (error);
        return;
    }

    g_return_if_fail (duplicates != NULL);

    /* Finalize the activity here so we don't leave a message in
     * the task bar while prompting the user for confirmation. */
    e_activity_set_state (context->activity, E_ACTIVITY_COMPLETED);
    g_object_unref (context->activity);
    context->activity = NULL;

    n_duplicates = g_hash_table_size (duplicates);

    if (n_duplicates == 0) {
        em_utils_prompt_user (
            parent_window, NULL,
            "mail:info-no-remove-duplicates",
            camel_folder_get_display_name (folder), NULL);
    } else {
        gchar *confirmation;
        gboolean proceed;

        confirmation = g_strdup_printf (ngettext (
            /* Translators: %s is replaced with a folder
             * name %u with count of duplicate messages. */
            "Folder '%s' contains %u duplicate message. "
            "Are you sure you want to delete it?",
            "Folder '%s' contains %u duplicate messages. "
            "Are you sure you want to delete them?",
            n_duplicates),
            camel_folder_get_display_name (folder),
            n_duplicates);

        proceed = em_utils_prompt_user (
            parent_window, NULL,
            "mail:ask-remove-duplicates",
            confirmation, NULL);

        if (proceed) {
            GHashTableIter iter;
            gpointer key;

            camel_folder_freeze (folder);

            g_hash_table_iter_init (&iter, duplicates);

            /* Mark duplicate messages for deletion. */
            while (g_hash_table_iter_next (&iter, &key, NULL))
                camel_folder_delete_message (folder, key);

            camel_folder_thaw (folder);
        }

        g_free (confirmation);
    }

    g_hash_table_destroy (duplicates);

    async_context_free (context);
}

void
e_mail_reader_remove_duplicates (EMailReader *reader)
{
    AsyncContext *context;
    GCancellable *cancellable;
    EMailBackend *backend;
    CamelFolder *folder;
    GPtrArray *uids;

    g_return_if_fail (E_IS_MAIL_READER (reader));

    folder = e_mail_reader_get_folder (reader);
    uids = e_mail_reader_get_selected_uids (reader);
    g_return_if_fail (uids != NULL);

    /* XXX Either e_mail_reader_get_selected_uids()
     *     or MessageList should do this itself. */
    g_ptr_array_set_free_func (uids, (GDestroyNotify) g_free);

    /* Find duplicate messages asynchronously. */

    context = g_slice_new0 (AsyncContext);
    context->activity = e_activity_new ();
    context->reader = g_object_ref (reader);

    cancellable = camel_operation_new ();
    e_activity_set_cancellable (context->activity, cancellable);

    backend = e_mail_reader_get_backend (reader);
    e_shell_backend_add_activity (
        E_SHELL_BACKEND (backend), context->activity);

    e_mail_folder_find_duplicate_messages (
        folder, uids, G_PRIORITY_DEFAULT,
        cancellable, (GAsyncReadyCallback)
        mail_reader_remove_duplicates_cb,
        context);

    g_object_unref (cancellable);

    g_ptr_array_unref (uids);
}

/* Helper for e_mail_reader_reply_to_message()
 * XXX This function belongs in e-html-utils.c */
static gboolean
html_contains_nonwhitespace (const gchar *html,
                             gint len)
{
    const gchar *cp;
    gunichar uc = 0;

    if (html == NULL || len <= 0)
        return FALSE;

    cp = html;

    while (cp != NULL && cp - html < len) {
        uc = g_utf8_get_char (cp);
        if (uc == 0)
            break;

        if (uc == '<') {
            /* skip until next '>' */
            uc = g_utf8_get_char (cp);
            while (uc != 0 && uc != '>' && cp - html < len) {
                cp = g_utf8_next_char (cp);
                uc = g_utf8_get_char (cp);
            }
            if (uc == 0)
                break;
        } else if (uc == '&') {
            /* sequence '&nbsp;' is a space */
            if (g_ascii_strncasecmp (cp, "&nbsp;", 6) == 0)
                cp = cp + 5;
            else
                break;
        } else if (!g_unichar_isspace (uc))
            break;

        cp = g_utf8_next_char (cp);
    }

    return cp - html < len - 1 && uc != 0;
}

void
e_mail_reader_reply_to_message (EMailReader *reader,
                                CamelMimeMessage *src_message,
                                EMailReplyType reply_type)
{
    EShell *shell;
    EMailBackend *backend;
    EShellBackend *shell_backend;
    EMFormatHTML *formatter;
    GtkWidget *message_list;
    CamelMimeMessage *new_message;
    CamelFolder *folder;
    EMailReplyStyle reply_style;
    EWebView *web_view;
    struct _camel_header_raw *header;
    const gchar *uid;
    gchar *selection = NULL;
    gint length;

    /* This handles quoting only selected text in the reply.  If
     * nothing is selected or only whitespace is selected, fall
     * back to the normal em_utils_reply_to_message(). */

    g_return_if_fail (E_IS_MAIL_READER (reader));

    backend = e_mail_reader_get_backend (reader);
    folder = e_mail_reader_get_folder (reader);
    formatter = e_mail_reader_get_formatter (reader);
    message_list = e_mail_reader_get_message_list (reader);
    reply_style = e_mail_reader_get_reply_style (reader);

    shell_backend = E_SHELL_BACKEND (backend);
    shell = e_shell_backend_get_shell (shell_backend);

    web_view = em_format_html_get_web_view (formatter);

    uid = MESSAGE_LIST (message_list)->cursor_uid;
    g_return_if_fail (uid != NULL);

    if (!gtk_widget_get_mapped (GTK_WIDGET (web_view)))
        goto whole_message;

    if (src_message == NULL) {
        src_message = EM_FORMAT (formatter)->message;
        if (src_message != NULL)
            g_object_ref (src_message);
    }

    if (!e_web_view_is_selection_active (web_view))
        goto whole_message;

    selection = gtk_html_get_selection_html (GTK_HTML (web_view), &length);
    if (selection == NULL || *selection == '\0')
        goto whole_message;

    if (!html_contains_nonwhitespace (selection, length))
        goto whole_message;

    new_message = camel_mime_message_new ();

    /* Filter out "content-*" headers. */
    header = CAMEL_MIME_PART (src_message)->headers;
    while (header != NULL) {
        if (g_ascii_strncasecmp (header->name, "content-", 8) != 0)
            camel_medium_add_header (
                CAMEL_MEDIUM (new_message),
                header->name, header->value);

        header = header->next;
    }

    camel_mime_part_set_encoding (
        CAMEL_MIME_PART (new_message),
        CAMEL_TRANSFER_ENCODING_8BIT);

    camel_mime_part_set_content (
        CAMEL_MIME_PART (new_message),
        selection, length, "text/html");

    g_object_unref (src_message);

    em_utils_reply_to_message (
        shell, folder, uid, new_message,
        reply_type, reply_style, NULL);

    g_free (selection);

    return;

whole_message:
    em_utils_reply_to_message (
        shell, folder, uid, src_message,
        reply_type, reply_style, EM_FORMAT (formatter));
}

void
e_mail_reader_select_next_message (EMailReader *reader,
                                   gboolean or_else_previous)
{
    GtkWidget *message_list;
    gboolean hide_deleted;
    gboolean success;

    g_return_if_fail (E_IS_MAIL_READER (reader));

    hide_deleted = e_mail_reader_get_hide_deleted (reader);
    message_list = e_mail_reader_get_message_list (reader);

    success = message_list_select (
        MESSAGE_LIST (message_list),
        MESSAGE_LIST_SELECT_NEXT, 0, 0);

    if (!success && (hide_deleted || or_else_previous))
        message_list_select (
            MESSAGE_LIST (message_list),
            MESSAGE_LIST_SELECT_PREVIOUS, 0, 0);
}

/* Helper for e_mail_reader_create_filter_from_selected() */
static void
mail_reader_create_filter_cb (CamelFolder *folder,
                              const gchar *uid,
                              CamelMimeMessage *message,
                              gpointer user_data)
{
    struct {
        EMailSession *session;
        const gchar *source;
        gint type;
    } *filter_data = user_data;

    if (message != NULL)
        filter_gui_add_from_message (
            filter_data->session,
            message,
            filter_data->source,
            filter_data->type);

    g_object_unref (filter_data->session);
    g_free (filter_data);
}

void
e_mail_reader_create_filter_from_selected (EMailReader *reader,
                                           gint filter_type)
{
    EMailBackend *backend;
    EMailSession *session;
    CamelFolder *folder;
    const gchar *filter_source;
    GPtrArray *uids;

    struct {
        EMailSession *session;
        const gchar *source;
        gint type;
    } *filter_data;

    g_return_if_fail (E_IS_MAIL_READER (reader));

    folder = e_mail_reader_get_folder (reader);
    backend = e_mail_reader_get_backend (reader);
    session = e_mail_backend_get_session (backend);

    if (em_utils_folder_is_sent (folder))
        filter_source = E_FILTER_SOURCE_OUTGOING;
    else if (em_utils_folder_is_outbox (folder))
        filter_source = E_FILTER_SOURCE_OUTGOING;
    else
        filter_source = E_FILTER_SOURCE_INCOMING;

    uids = e_mail_reader_get_selected_uids (reader);

    if (uids->len == 1) {
        filter_data = g_malloc (sizeof (*filter_data));
        filter_data->session = g_object_ref (session);
        filter_data->source = filter_source;
        filter_data->type = filter_type;

        mail_get_message (
            folder, uids->pdata[0],
            mail_reader_create_filter_cb,
            filter_data, mail_msg_unordered_push);
    }

    em_utils_uids_free (uids);
}

/* Helper for e_mail_reader_create_vfolder_from_selected() */
static void
mail_reader_create_vfolder_cb (CamelFolder *folder,
                               const gchar *uid,
                               CamelMimeMessage *message,
                               gpointer user_data)
{
    struct {
        EMailSession *session;
        gint type;
    } *vfolder_data = user_data;

    if (message != NULL)
        vfolder_gui_add_from_message (
            vfolder_data->session, message,
            vfolder_data->type, folder);

    g_object_unref (vfolder_data->session);
    g_free (vfolder_data);
}

void
e_mail_reader_create_vfolder_from_selected (EMailReader *reader,
                                            gint vfolder_type)
{
    EMailBackend *backend;
    EMailSession *session;
    CamelFolder *folder;
    GPtrArray *uids;

    struct {
        EMailSession *session;
        gint type;
    } *vfolder_data;

    g_return_if_fail (E_IS_MAIL_READER (reader));

    backend = e_mail_reader_get_backend (reader);
    session = e_mail_backend_get_session (backend);

    folder = e_mail_reader_get_folder (reader);
    uids = e_mail_reader_get_selected_uids (reader);

    if (uids->len == 1) {
        vfolder_data = g_malloc (sizeof (*vfolder_data));
        vfolder_data->session = g_object_ref (session);
        vfolder_data->type = vfolder_type;

        mail_get_message (
            folder, uids->pdata[0],
            mail_reader_create_vfolder_cb,
            vfolder_data, mail_msg_unordered_push);
    }

    em_utils_uids_free (uids);
}

static EMailReaderHeader *
emr_header_from_xmldoc (xmlDocPtr doc)
{
    EMailReaderHeader *h;
    xmlNodePtr root;
    xmlChar *name;

    if (doc == NULL)
        return NULL;

    root = doc->children;
    if (strcmp ((gchar *)root->name, "header") != 0)
        return NULL;

    name = xmlGetProp (root, (const guchar *)"name");
    if (name == NULL)
        return NULL;

    h = g_malloc0 (sizeof (EMailReaderHeader));
    h->name = g_strdup ((gchar *) name);
    xmlFree (name);

    if (xmlHasProp (root, (const guchar *)"enabled"))
        h->enabled = 1;
    else
        h->enabled = 0;

    return h;
}

/**
 * e_mail_reader_header_from_xml
 * @xml: XML configuration data
 *
 * Parses passed XML data, which should be of
 * the format <header name="foo" enabled />, and
 * returns a EMailReaderHeader structure, or NULL if there
 * is an error.
 **/
EMailReaderHeader *
e_mail_reader_header_from_xml (const gchar *xml)
{
    EMailReaderHeader *header;
    xmlDocPtr doc;

    if (!(doc = xmlParseDoc ((guchar *) xml)))
        return NULL;

    header = emr_header_from_xmldoc (doc);
    xmlFreeDoc (doc);

    return header;
}

/**
 * e_mail_reader_header_to_xml
 * @header: header from which to generate XML
 *
 * Returns the passed header as a XML structure,
 * or NULL on error
 */
gchar *
e_mail_reader_header_to_xml (EMailReaderHeader *header)
{
    xmlDocPtr doc;
    xmlNodePtr root;
    xmlChar *xml;
    gchar *out;
    gint size;

    g_return_val_if_fail (header != NULL, NULL);
    g_return_val_if_fail (header->name != NULL, NULL);

    doc = xmlNewDoc ((const guchar *)"1.0");

    root = xmlNewDocNode (doc, NULL, (const guchar *)"header", NULL);
    xmlSetProp (root, (const guchar *)"name", (guchar *)header->name);
    if (header->enabled)
        xmlSetProp (root, (const guchar *)"enabled", NULL);

    xmlDocSetRootElement (doc, root);
    xmlDocDumpMemory (doc, &xml, &size);
    xmlFreeDoc (doc);

    out = g_malloc (size + 1);
    memcpy (out, xml, size);
    out[size] = '\0';
    xmlFree (xml);

    return out;
}

/**
 * e_mail_reader_header_free
 * @header: header to free
 *
 * Frees the memory associated with the passed header
 * structure.
 */
void
e_mail_reader_header_free (EMailReaderHeader *header)
{
    if (header == NULL)
        return;

    g_free (header->name);
    g_free (header);
}

static void
headers_changed_cb (GConfClient *client,
                    guint cnxn_id,
                    GConfEntry *entry,
                    EMailReader *reader)
{
    EMFormatHTML *formatter;
    GSList *header_config_list, *p;

    g_return_if_fail (client != NULL);
    g_return_if_fail (reader != NULL);

    formatter = e_mail_reader_get_formatter (reader);

    header_config_list = gconf_client_get_list (
        client, "/apps/evolution/mail/display/headers",
        GCONF_VALUE_STRING, NULL);
    em_format_clear_headers (EM_FORMAT (formatter));
    for (p = header_config_list; p; p = g_slist_next (p)) {
        EMailReaderHeader *h;
        gchar *xml = (gchar *) p->data;

        h = e_mail_reader_header_from_xml (xml);
        if (h && h->enabled)
            em_format_add_header (
                EM_FORMAT (formatter),
                h->name, EM_FORMAT_HEADER_BOLD);

        e_mail_reader_header_free (h);
    }

    if (!header_config_list)
        em_format_default_headers (EM_FORMAT (formatter));

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

    /* force a redraw */
    if (EM_FORMAT (formatter)->message)
        em_format_queue_redraw (EM_FORMAT (formatter));
}

static void
remove_header_notify_cb (gpointer data)
{
    GConfClient *client;
    guint notify_id;

    notify_id = GPOINTER_TO_INT (data);
    g_return_if_fail (notify_id != 0);

    client = gconf_client_get_default ();
    gconf_client_notify_remove (client, notify_id);
    gconf_client_remove_dir (client, "/apps/evolution/mail/display", NULL);
    g_object_unref (client);
}

/**
 * e_mail_reader_connect_headers
 * @reader: an #EMailReader
 *
 * Connects @reader to listening for changes in headers and
 * updates the EMFormat whenever it changes and on this call too.
 **/
void
e_mail_reader_connect_headers (EMailReader *reader)
{
    GConfClient *client;
    guint notify_id;

    client = gconf_client_get_default ();

    gconf_client_add_dir (
        client, "/apps/evolution/mail/display",
        GCONF_CLIENT_PRELOAD_NONE, NULL);
    notify_id = gconf_client_notify_add (
        client, "/apps/evolution/mail/display/headers",
        (GConfClientNotifyFunc) headers_changed_cb,
        reader, NULL, NULL);

    g_object_set_data_full (
        G_OBJECT (reader), "reader-header-notify-id",
        GINT_TO_POINTER (notify_id), remove_header_notify_cb);

    headers_changed_cb (client, 0, NULL, reader);

    g_object_unref (client);
}