path: root/mail/message-list.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * message-list.c: Displays the messages.
 *                 Implements CORBA's Evolution::MessageList
 *
 * Author:
 *     Miguel de Icaza (miguel@helixcode.com)
 *     Bertrand Guiheneuf (bg@aful.org)
 *     And just about everyone else in evolution ...
 *
 * (C) 2000 Helix Code, Inc.
 */

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

#include <string.h>
#include <ctype.h>

#include <gal/util/e-util.h>
#include <gal/widgets/e-gui-utils.h>
#include <gal/e-table/e-cell-text.h>
#include <gal/e-table/e-cell-toggle.h>
#include <gal/e-table/e-cell-checkbox.h>
#include <gal/e-table/e-cell-tree.h>
#include <gal/e-table/e-cell-date.h>
#include <gal/e-table/e-cell-size.h>
#include <gal/e-table/e-tree-memory.h>
#include <gal/e-table/e-tree-memory-callbacks.h>

#include <camel/camel-exception.h>
#include <camel/camel-file-utils.h>
#include <camel/camel-folder.h>
#include <camel/camel-folder-thread.h>
#include <camel/camel-vtrash-folder.h>
#include <e-util/ename/e-name-western.h>
#include <e-util/e-memory.h>

#include "mail-config.h"
#include "message-list.h"
#include "mail-mt.h"
#include "mail-tools.h"
#include "mail-ops.h"
#include "Mail.h"

#include "art/mail-new.xpm"
#include "art/mail-read.xpm"
#include "art/mail-replied.xpm"
#include "art/attachment.xpm"
#include "art/priority-high.xpm"
#include "art/empty.xpm"
#include "art/score-lowest.xpm"
#include "art/score-lower.xpm"
#include "art/score-low.xpm"
#include "art/score-normal.xpm"
#include "art/score-high.xpm"
#include "art/score-higher.xpm"
#include "art/score-highest.xpm"

/*#define TIMEIT */

#ifdef TIMEIT
#include <sys/time.h>
#include <unistd.h>
#endif

#define d(x)
#define t(x)

/*
 * Default sizes for the ETable display
 *
 */
#define N_CHARS(x) (CHAR_WIDTH * (x))

#define COL_ICON_WIDTH         (16)
#define COL_ATTACH_WIDTH       (16)
#define COL_CHECK_BOX_WIDTH    (16)
#define COL_FROM_EXPANSION     (24.0)
#define COL_FROM_WIDTH_MIN     (32)
#define COL_SUBJECT_EXPANSION  (30.0)
#define COL_SUBJECT_WIDTH_MIN  (32)
#define COL_SENT_EXPANSION     (24.0)
#define COL_SENT_WIDTH_MIN     (32)
#define COL_RECEIVED_EXPANSION (20.0)
#define COL_RECEIVED_WIDTH_MIN (32)
#define COL_TO_EXPANSION       (24.0)
#define COL_TO_WIDTH_MIN       (32)
#define COL_SIZE_EXPANSION     (6.0)
#define COL_SIZE_WIDTH_MIN     (32)

#define PARENT_TYPE (e_tree_scrolled_get_type ())

/* #define SMART_ADDRESS_COMPARE */

#ifdef SMART_ADDRESS_COMPARE
struct _EMailAddress {
    ENameWestern *wname;
    gchar *address;
};

typedef struct _EMailAddress EMailAddress;
#endif /* SMART_ADDRESS_COMPARE */

static ETreeScrolledClass *message_list_parent_class;

static void on_cursor_activated_cmd (ETree *tree, int row, ETreePath path, gpointer user_data);
static gint on_click (ETree *tree, gint row, ETreePath path, gint col, GdkEvent *event, MessageList *list);
static char *filter_date (time_t date);
static char *filter_size (int size);

static void folder_changed (CamelObject *o, gpointer event_data, gpointer user_data);
static void message_changed (CamelObject *o, gpointer event_data, gpointer user_data);

static void hide_save_state(MessageList *ml);
static void hide_load_state(MessageList *ml);

/* note: @changes is owned/freed by the caller */
/*static void mail_do_regenerate_messagelist (MessageList *list, const char *search, const char *hideexpr, CamelFolderChangeInfo *changes);*/
static void mail_regen_list(MessageList *ml, const char *search, const char *hideexpr, CamelFolderChangeInfo *changes);

static void clear_info(char *key, ETreePath *node, MessageList *ml);

enum {
    MESSAGE_SELECTED,
    LAST_SIGNAL
};

static guint message_list_signals [LAST_SIGNAL] = {0, };

static struct {
    char **image_base;
    GdkPixbuf  *pixbuf;
} states_pixmaps [] = {
    { mail_new_xpm,     NULL },
    { mail_read_xpm,    NULL },
    { mail_replied_xpm, NULL },
/* FIXME: Replace these with pixmaps for multiple_read and multiple_unread */
        { mail_new_xpm,     NULL },
        { mail_read_xpm,    NULL },
    { empty_xpm,        NULL },
    { attachment_xpm,   NULL },
    { priority_high_xpm,    NULL },
    { score_lowest_xpm,     NULL },
    { score_lower_xpm,      NULL },
    { score_low_xpm,        NULL },
    { score_normal_xpm,     NULL },
    { score_high_xpm,       NULL },
    { score_higher_xpm,     NULL },
    { score_highest_xpm,    NULL },
    { NULL,         NULL }
};

enum DndTargetTyhpe {
    DND_TARGET_LIST_TYPE_URI,
};
#define URI_LIST_TYPE "text/uri-list"
static GtkTargetEntry drag_types[] = {
    { URI_LIST_TYPE, 0, DND_TARGET_LIST_TYPE_URI },
};
static const int num_drag_types = sizeof (drag_types) / sizeof (drag_types[0]);

#ifdef SMART_ADDRESS_COMPARE
static EMailAddress *
e_mail_address_new (const char *address)
{
    CamelInternetAddress *cia;
    EMailAddress *new;
    const char *name = NULL, *addr = NULL;
    
    cia = camel_internet_address_new ();
    if (camel_address_unformat (CAMEL_ADDRESS (cia), address) == -1) {
        camel_object_unref (CAMEL_OBJECT (cia));
        return NULL;
    }
    camel_internet_address_get (cia, 0, &name, &addr);
    
    new = g_new (EMailAddress, 1);
    new->address = g_strdup (addr);
    if (name && *name) {
        new->wname = e_name_western_parse (name);
    } else {
        new->wname = NULL;
    }
    
    camel_object_unref (CAMEL_OBJECT (cia));
    
    return new;
}

static void
e_mail_address_free (EMailAddress *addr)
{
    g_return_if_fail (addr != NULL);
    
    g_free (addr->address);
    if (addr->wname)
        e_name_western_free (addr->wname);
    g_free (addr);
}

static gint
e_mail_address_compare (gconstpointer address1, gconstpointer address2)
{
    const EMailAddress *addr1 = address1;
    const EMailAddress *addr2 = address2;
    gint retval;
    
    g_return_val_if_fail (addr1 != NULL, 1);
    g_return_val_if_fail (addr2 != NULL, -1);
    
    if (!addr1->wname && !addr2->wname) {
        /* have to compare addresses, one or both don't have names */
        g_return_val_if_fail (addr1->address != NULL, 1);
        g_return_val_if_fail (addr2->address != NULL, -1);
        
        return g_strcasecmp (addr1->address, addr2->address);
    }

    if (!addr1->wname)
        return -1;
    if (!addr2->wname)
        return 1;

    if (!addr1->wname->last && !addr2->wname->last) {
        /* neither has a last name - default to address? */
        /* FIXME: what do we compare next? */
        g_return_val_if_fail (addr1->address != NULL, 1);
        g_return_val_if_fail (addr2->address != NULL, -1);
            
        return g_strcasecmp (addr1->address, addr2->address);
    } 

    if (!addr1->wname->last)
        return -1;
    if (!addr2->wname->last)
        return 1;

    retval = g_strcasecmp (addr1->wname->last, addr2->wname->last);
    if (retval) 
        return retval;

    /* last names are identical - compare first names */

    if (!addr1->wname->first && !addr2->wname->first)
        return g_strcasecmp (addr1->address, addr2->address);

    if (!addr1->wname->first)
        return -1;
    if (!addr2->wname->first)
        return 1;

    retval = g_strcasecmp (addr1->wname->first, addr2->wname->first);
    if (retval) 
        return retval;

    return g_strcasecmp (addr1->address, addr2->address);
}
#endif /* SMART_ADDRESS_COMPARE */

static gint
address_compare (gconstpointer address1, gconstpointer address2)
{
#ifdef SMART_ADDRESS_COMPARE
    EMailAddress *addr1, *addr2;
#endif /* SMART_ADDRESS_COMPARE */
    gint retval;
    
    g_return_val_if_fail (address1 != NULL, 1);
    g_return_val_if_fail (address2 != NULL, -1);
    
#ifdef SMART_ADDRESS_COMPARE
    addr1 = e_mail_address_new (address1);
    addr2 = e_mail_address_new (address2);
    retval = e_mail_address_compare (addr1, addr2);
    e_mail_address_free (addr1);
    e_mail_address_free (addr2);
#else
    retval = g_strcasecmp ((const char *) address1, (const char *) address2);
#endif /* SMART_ADDRESS_COMPARE */
    
    return retval;
}

static gint
subject_compare (gconstpointer subject1, gconstpointer subject2)
{
    char *sub1;
    char *sub2;
    
    g_return_val_if_fail (subject1 != NULL, 1);
    g_return_val_if_fail (subject2 != NULL, -1);
    
    /* trim off any "Re:"'s at the beginning of subject1 */
    sub1 = (char *) subject1;
    while (!g_strncasecmp (sub1, "Re:", 3)) {
        sub1 += 3;
        /* jump over any spaces */
        for ( ; *sub1 && isspace (*sub1); sub1++);
    }
    
    /* trim off any "Re:"'s at the beginning of subject2 */
    sub2 = (char *) subject2;
    while (!g_strncasecmp (sub2, "Re:", 3)) {
        sub2 += 3;
        /* jump over any spaces */
        for ( ; *sub2 && isspace (*sub2); sub2++);
    }
    
    /* jump over any spaces */
    for ( ; *sub1 && isspace (*sub1); sub1++);
    for ( ; *sub2 && isspace (*sub2); sub2++);
    
    return g_strcasecmp (sub1, sub2);
}

static gchar *
filter_size (gint size)
{
    gfloat fsize;
    
    if (size < 1024) {
        return g_strdup_printf ("%d", size);
    } else {
        fsize = ((gfloat) size) / 1024.0;
        if (fsize < 1024.0) {
            return g_strdup_printf ("%.2f K", fsize);
        } else {
            fsize /= 1024.0;
            return g_strdup_printf ("%.2f M", fsize);
        }
    }
}

/* Gets the uid of the message displayed at a given view row */
static const char *
get_message_uid (MessageList *message_list, ETreePath node)
{
    CamelMessageInfo *info;

    g_return_val_if_fail (node != NULL, NULL);
    info = e_tree_memory_node_get_data (E_TREE_MEMORY(message_list->model), node);

    return camel_message_info_uid(info);
}

/* Gets the CamelMessageInfo for the message displayed at the given
 * view row.
 */
static CamelMessageInfo *
get_message_info (MessageList *message_list, ETreePath node)
{
    g_return_val_if_fail (node != NULL, NULL);
    return e_tree_memory_node_get_data (E_TREE_MEMORY (message_list->model), node);
}

/**
 * message_list_select:
 * @message_list: a MessageList
 * @base_row: the (model) row to start from
 * @direction: the direction to search in
 * @flags: a set of flag values
 * @mask: a mask for comparing against @flags
 *
 * This moves the message list selection to a suitable row. @base_row
 * lists the first (model) row to try, but as a special case, model
 * row -1 is mapped to the last row. @flags and @mask combine to specify
 * what constitutes a suitable row. @direction is
 * %MESSAGE_LIST_SELECT_NEXT if it should find the next matching
 * message, or %MESSAGE_LIST_SELECT_PREVIOUS if it should find the
 * previous. If no suitable row is found, the selection will be
 * unchanged.
 **/
void
message_list_select (MessageList *message_list, int base_row,
             MessageListSelectDirection direction,
             guint32 flags, guint32 mask)
{
    CamelMessageInfo *info;
    int vrow, last;
    ETree *et = message_list->tree;

    if (!GTK_WIDGET_HAS_FOCUS (message_list))
        gtk_widget_grab_focus (GTK_WIDGET (message_list));

    switch (direction) {
    case MESSAGE_LIST_SELECT_PREVIOUS:
        last = -1;
        break;
    case MESSAGE_LIST_SELECT_NEXT:
        last = e_tree_row_count (message_list->tree);
        break;
    default:
        g_warning("Invalid argument to message_list_select");
        return;
    }

    if (base_row == -1)
        base_row = e_tree_row_count(message_list->tree) - 1;

    /* model_to_view_row etc simply dont work for sorted views.  Sigh. */
    vrow = e_tree_model_to_view_row (et, base_row);

    /* This means that we'll move at least one message in 'direction'. */
    if (vrow != last)
        vrow += direction;

    /* We don't know whether to use < or > due to "direction" */
    while (vrow != last) {
        ETreePath node = e_tree_node_at_row(et, vrow);
        info = get_message_info (message_list, node);
        if (info && (info->flags & mask) == flags) {
            e_tree_set_cursor (et, node);
            gtk_signal_emit(GTK_OBJECT (message_list), message_list_signals [MESSAGE_SELECTED], camel_message_info_uid(info));
            return;
        }
        vrow += direction;
    }
}


/**
 * message_list_select_uid:
 * @message_list:
 * @uid:
 *
 * Selects the message with the given UID.
 **/
void
message_list_select_uid (MessageList *message_list, const char *uid)
{
    ETreePath node;
    
    node = g_hash_table_lookup (message_list->uid_nodemap, uid);
    if (node) {
        CamelMessageInfo *info;
        
        info = get_message_info (message_list, node);
        e_tree_set_cursor (message_list->tree, node);
        gtk_signal_emit (GTK_OBJECT (message_list), message_list_signals[MESSAGE_SELECTED],
                 camel_message_info_uid (info));
    } else {
        g_free (message_list->cursor_uid);
        message_list->cursor_uid = NULL;
        gtk_signal_emit (GTK_OBJECT (message_list), message_list_signals [MESSAGE_SELECTED], NULL);
    }
}

static void
add_uid (MessageList *ml, const char *uid, gpointer data)
{
    g_ptr_array_add ((GPtrArray *) data, g_strdup (uid));
}

static void
message_list_drag_data_get (ETree             *tree,
                int                 row,
                ETreePath           path,
                int                 col,
                GdkDragContext     *context,
                GtkSelectionData   *selection_data,
                guint               info,
                guint               time,
                gpointer            user_data)
{
    MessageList *mlist = (MessageList *) user_data;
    CamelMessageInfo *minfo;
    GPtrArray *uids = NULL;
    char *tmpl, *tmpdir, *filename, *subject;
    
    switch (info) {
    case DND_TARGET_LIST_TYPE_URI:
        /* drag & drop into nautilus */
        tmpl = g_strdup ("/tmp/evolution.XXXXXX");
#ifdef HAVE_MKDTEMP
        tmpdir = mkdtemp (tmpl);
#else
        tmpdir = mktemp (tmpl);
        if (tmpdir) {
            if (mkdir (tmpdir, S_IRWXU) == -1)
                tmpdir = NULL;
        }
#endif
        if (!tmpdir) {
            g_free (tmpl);
            return;
        }

        minfo = get_message_info (mlist, path);
        if (minfo == NULL) {
            g_warning("Row %d is invalid", row);
            g_free(tmpl);
            return;
        }
        subject = g_strdup (camel_message_info_subject (minfo));
        e_filename_make_safe (subject);
        filename = g_strdup_printf ("%s/%s.eml", tmpdir, subject);
        g_free (subject);
        
        uids = g_ptr_array_new ();
        message_list_foreach (mlist, add_uid, uids);
        
        mail_msg_wait(mail_save_messages(mlist->folder, uids, filename, NULL, NULL));
        
        gtk_selection_data_set (selection_data, selection_data->target, 8,
                    (guchar *) filename, strlen (filename));
        
        g_free (tmpl);
        g_free (filename);
        break;
    default:
        break;
    }
}

/*
 * SimpleTableModel::col_count
 */
static int
ml_column_count (ETreeModel *etm, void *data)
{
    return COL_LAST;
}

/*
 * SimpleTableModel::has_save_id
 */
static gboolean
ml_has_save_id (ETreeModel *etm, void *data)
{
    return TRUE;
}

/*
 * SimpleTableModel::get_save_id
 */
static char *
ml_get_save_id (ETreeModel *etm, ETreePath path, void *data)
{
    CamelMessageInfo *info;

    info = e_tree_memory_node_get_data (E_TREE_MEMORY(etm), path);
    if (info == NULL)
        return g_strdup("root");
    return g_strdup (camel_message_info_uid(info));
}

/*
 * SimpleTableModel::has_save_id
 */
static gboolean
ml_has_get_node_by_id (ETreeModel *etm, void *data)
{
    return TRUE;
}

/*
 * SimpleTableModel::get_save_id
 */
static ETreePath
ml_get_node_by_id (ETreeModel *etm, char *save_id, void *data)
{
    MessageList *ml;

    ml = data;

    if (!strcmp (save_id, "root"))
        return e_tree_model_get_root (etm);

    return g_hash_table_lookup(ml->uid_nodemap, save_id);
}

static void *
ml_duplicate_value (ETreeModel *etm, int col, const void *value, void *data)
{
    switch (col){
    case COL_MESSAGE_STATUS:
    case COL_FLAGGED:
    case COL_SCORE:
    case COL_ATTACHMENT:
    case COL_DELETED:
    case COL_UNREAD:
    case COL_SENT:
    case COL_RECEIVED:
    case COL_SIZE:
        return (void *) value;

    case COL_FROM:
    case COL_SUBJECT:
    case COL_TO:
        return g_strdup (value);

    default:
        g_assert_not_reached ();
    }
    return NULL;
}

static void
ml_free_value (ETreeModel *etm, int col, void *value, void *data)
{
    switch (col){
    case COL_MESSAGE_STATUS:
    case COL_FLAGGED:
    case COL_SCORE:
    case COL_ATTACHMENT:
    case COL_DELETED:
    case COL_UNREAD:
    case COL_SENT:
    case COL_RECEIVED:
    case COL_SIZE:
        break;

    case COL_FROM:
    case COL_SUBJECT:
    case COL_TO:
        g_free (value);
        break;
    default:
        g_assert_not_reached ();
    }
}

static void *
ml_initialize_value (ETreeModel *etm, int col, void *data)
{
    switch (col){
    case COL_MESSAGE_STATUS:
    case COL_FLAGGED:
    case COL_SCORE:
    case COL_ATTACHMENT:
    case COL_DELETED:
    case COL_UNREAD:
    case COL_SENT:
    case COL_RECEIVED:
    case COL_SIZE:
        return NULL;

    case COL_FROM:
    case COL_SUBJECT:
    case COL_TO:
        return g_strdup("");
    default:
        g_assert_not_reached ();
    }

    return NULL;
}

static gboolean
ml_value_is_empty (ETreeModel *etm, int col, const void *value, void *data)
{
    switch (col){
    case COL_MESSAGE_STATUS:
    case COL_FLAGGED:
    case COL_SCORE:
    case COL_ATTACHMENT:
    case COL_DELETED:
    case COL_UNREAD:
    case COL_SENT:
    case COL_RECEIVED:
    case COL_SIZE:
        return value == NULL;

    case COL_FROM:
    case COL_SUBJECT:
    case COL_TO:
        return !(value && *(char *)value);
    default:
        g_assert_not_reached ();
        return FALSE;
    }
}

static const char *status_map[] = {
    N_("Unseen"),
    N_("Seen"),
    N_("Answered"),
    N_("Multiple Unseen Messages"),
    N_("Multiple Messages"),
};

static const char *score_map[] = {
    N_("Lowest"),
    N_("Lower"),
    N_("Low"),
    N_("Normal"),
    N_("High"),
    N_("Higher"),
    N_("Highest"),
};

static char *
ml_value_to_string (ETreeModel *etm, int col, const void *value, void *data)
{
    unsigned int i;

    switch (col){
    case COL_MESSAGE_STATUS:
        i = (unsigned int)value;
        if (i > 4)
            return g_strdup("");
        return g_strdup(_(status_map[i]));

    case COL_SCORE:
        i = (unsigned int)value + 3;
        if (i > 6)
            i = 3;
        return g_strdup(_(score_map[i]));
        
    case COL_ATTACHMENT:
    case COL_FLAGGED:
    case COL_DELETED:
    case COL_UNREAD:
        return g_strdup_printf("%d", (int) value);
        
    case COL_SENT:
    case COL_RECEIVED:
        return filter_date (GPOINTER_TO_INT(value));
        
    case COL_SIZE:
        return filter_size (GPOINTER_TO_INT(value));

    case COL_FROM:
    case COL_SUBJECT:
    case COL_TO:
        return g_strdup (value);
    default:
        g_assert_not_reached ();
        return NULL;
    }
}

static GdkPixbuf *
ml_tree_icon_at (ETreeModel *etm, ETreePath path, void *model_data)
{
    /* we dont really need an icon ... */
    return NULL;
}

/* return true if there are any unread messages in the subtree */
static int
subtree_unread(MessageList *ml, ETreePath node)
{
    CamelMessageInfo *info;
    ETreePath child;

    while (node) {
        info = e_tree_memory_node_get_data((ETreeMemory *)ml->model, node);
        g_assert(info);

        if (!(info->flags & CAMEL_MESSAGE_SEEN))
            return TRUE;

        if ((child = e_tree_model_node_get_first_child (E_TREE_MODEL (ml->model), node)))
            if (subtree_unread(ml, child))
                return TRUE;
        node = e_tree_model_node_get_next (ml->model, node);
    }
    return FALSE;
}

static int
subtree_size(MessageList *ml, ETreePath node)
{
    CamelMessageInfo *info;
    int size = 0;
    ETreePath child;

    while (node) {
        info = e_tree_memory_node_get_data((ETreeMemory *)ml->model, node);
        g_assert(info);

        size += info->size;
        if ((child = e_tree_model_node_get_first_child (E_TREE_MODEL (ml->model), node)))
            size += subtree_size(ml, child);

        node = e_tree_model_node_get_next (ml->model, node);
    }
    return size;
}

static time_t
subtree_earliest(MessageList *ml, ETreePath node, int sent)
{
    CamelMessageInfo *info;
    time_t earliest = 0, date;
    ETreePath *child;

    while (node) {
        info = e_tree_memory_node_get_data((ETreeMemory *)ml->model, node);
        g_assert(info);

        if (sent)
            date = info->date_sent;
        else
            date = info->date_received;

        if (earliest == 0 || date < earliest)
            earliest = date;

        if ((child = e_tree_model_node_get_first_child (ml->model, node))) {
            date = subtree_earliest(ml, child, sent);
            if (earliest == 0 || (date != 0 && date < earliest))
                earliest = date;
        }

        node = e_tree_model_node_get_next (ml->model, node);
    }

    return earliest;
}

static void *
ml_tree_value_at (ETreeModel *etm, ETreePath path, int col, void *model_data)
{
    MessageList *message_list = model_data;
    CamelMessageInfo *msg_info;

    /* retrieve the message information array */
    msg_info = e_tree_memory_node_get_data (E_TREE_MEMORY(etm), path);
    g_assert(msg_info);

    switch (col){
    case COL_MESSAGE_STATUS: {
        ETreePath child;

        /* if a tree is collapsed, then scan its insides for details */
        child = e_tree_model_node_get_first_child(etm, path);
        if (child && !e_tree_node_is_expanded(message_list->tree, path)) {
            if (subtree_unread(message_list, child))
                return (void *)3;
            else
                return (void *)4;
        }

        if (msg_info->flags & CAMEL_MESSAGE_ANSWERED)
            return GINT_TO_POINTER (2);
        else if (msg_info->flags & CAMEL_MESSAGE_SEEN)
            return GINT_TO_POINTER (1);
        else
            return GINT_TO_POINTER (0);
        break;
    }
    case COL_FLAGGED:
        return GINT_TO_POINTER ((msg_info->flags & CAMEL_MESSAGE_FLAGGED) != 0);
    case COL_SCORE: {
        const char *tag;
        int score = 0;
        
        tag = camel_tag_get ((CamelTag **) &msg_info->user_tags, "score");
        if (tag)
            score = atoi (tag);
        
        return GINT_TO_POINTER (score);
    }
    case COL_ATTACHMENT:
        return GINT_TO_POINTER ((msg_info->flags & CAMEL_MESSAGE_ATTACHMENTS) != 0);
    case COL_FROM:
        return (void *)camel_message_info_from(msg_info);
    case COL_SUBJECT:
        return (void *)camel_message_info_subject(msg_info);
    case COL_SENT:
        return GINT_TO_POINTER (msg_info->date_sent);
    case COL_RECEIVED:
        return GINT_TO_POINTER (msg_info->date_received);
    case COL_TO:
        return (void *)camel_message_info_to(msg_info);
    case COL_SIZE:
        return GINT_TO_POINTER (msg_info->size);
    case COL_DELETED:
        return GINT_TO_POINTER ((msg_info->flags & CAMEL_MESSAGE_DELETED) != 0);
    case COL_UNREAD: {
        ETreePath child;

        child = e_tree_model_node_get_first_child(etm, path);
        if (child && !e_tree_node_is_expanded(message_list->tree, path)
            && (msg_info->flags & CAMEL_MESSAGE_SEEN)) {
            return (void *)subtree_unread(message_list, child);
        }

        return GINT_TO_POINTER (!(msg_info->flags & CAMEL_MESSAGE_SEEN));
    }
    case COL_COLOUR: {
        const char *colour;

        colour = camel_tag_get ((CamelTag **) &msg_info->user_tags, "colour");
        if (colour == NULL && msg_info->flags & CAMEL_MESSAGE_FLAGGED)
            /* FIXME: extract from the xpm somehow. */
            colour = "#A7453E";
        return (void *)colour;
    }
    }

    g_assert_not_reached ();

    return NULL;
}

static void
ml_tree_set_value_at (ETreeModel *etm, ETreePath path, int col,
              const void *val, void *model_data)
{
    g_assert_not_reached ();
}

static gboolean
ml_tree_is_cell_editable (ETreeModel *etm, ETreePath path, int col, void *model_data)
{
    return FALSE;
}

static void
message_list_init_images (void)
{
    int i;
    
    /*
     * Only load once, and share
     */
    if (states_pixmaps [0].pixbuf)
        return;
    
    for (i = 0; states_pixmaps [i].image_base; i++){
        states_pixmaps [i].pixbuf = gdk_pixbuf_new_from_xpm_data (
            (const char **) states_pixmaps [i].image_base);
    }
}

static char *
filter_date (time_t date)
{
    time_t nowdate = time(NULL);
    time_t yesdate;
    struct tm then, now, yesterday;
    char buf[26];
    gboolean done = FALSE;

    if (date == 0)
        return g_strdup (_("?"));

    localtime_r (&date, &then);
    localtime_r (&nowdate, &now);
    if (then.tm_mday == now.tm_mday &&
        then.tm_mon == now.tm_mon &&
        then.tm_year == now.tm_year) {
        strftime (buf, 26, _("Today %l:%M %p"), &then);
        done = TRUE;
    }
    if (!done) {
        yesdate = nowdate - 60 * 60 * 24;
        localtime_r (&yesdate, &yesterday);
        if (then.tm_mday == yesterday.tm_mday &&
            then.tm_mon == yesterday.tm_mon &&
            then.tm_year == yesterday.tm_year) {
            strftime (buf, 26, _("Yesterday %l:%M %p"), &then);
            done = TRUE;
        }
    }
    if (!done) {
        int i;
        for (i = 2; i < 7; i++) {
            yesdate = nowdate - 60 * 60 * 24 * i;
            localtime_r (&yesdate, &yesterday);
            if (then.tm_mday == yesterday.tm_mday &&
                then.tm_mon == yesterday.tm_mon &&
                then.tm_year == yesterday.tm_year) {
                strftime (buf, 26, _("%a %l:%M %p"), &then);
                done = TRUE;
                break;
            }
        }
    }
    if (!done) {
        if (then.tm_year == now.tm_year) {
            strftime (buf, 26, _("%b %d %l:%M %p"), &then);
        } else {
            strftime (buf, 26, _("%b %d %Y"), &then);
        }
    }
#if 0
#ifdef CTIME_R_THREE_ARGS
    ctime_r (&date, buf, 26);
#else
    ctime_r (&date, buf);
#endif
#endif

    return g_strdup (buf);
}

static ETableExtras *
message_list_create_extras (void)
{
    int i;
    GdkPixbuf *images [7];
    ETableExtras *extras;
    ECell *cell;

    extras = e_table_extras_new();
    e_table_extras_add_pixbuf(extras, "status", states_pixmaps [0].pixbuf);
    e_table_extras_add_pixbuf(extras, "score", states_pixmaps [13].pixbuf);
    e_table_extras_add_pixbuf(extras, "attachment", states_pixmaps [6].pixbuf);
    e_table_extras_add_pixbuf(extras, "flagged", states_pixmaps [7].pixbuf);
    
    e_table_extras_add_compare(extras, "address_compare", address_compare);
    e_table_extras_add_compare(extras, "subject_compare", subject_compare);
    
    for (i = 0; i < 5; i++)
        images [i] = states_pixmaps [i].pixbuf;

    e_table_extras_add_cell(extras, "render_message_status", e_cell_toggle_new (0, 5, images));

    for (i = 0; i < 2; i++)
        images [i] = states_pixmaps [i + 5].pixbuf;
    
    e_table_extras_add_cell(extras, "render_attachment", e_cell_toggle_new (0, 2, images));
    
    images [1] = states_pixmaps [7].pixbuf;
    e_table_extras_add_cell(extras, "render_flagged", e_cell_toggle_new (0, 2, images));

    for (i = 0; i < 7; i++)
        images[i] = states_pixmaps [i + 7].pixbuf;
    
    e_table_extras_add_cell(extras, "render_score", e_cell_toggle_new (0, 7, images));
    
    /* date cell */
    cell = e_cell_date_new (NULL, GTK_JUSTIFY_LEFT);
    gtk_object_set (GTK_OBJECT (cell),
            "strikeout_column", COL_DELETED,
            "bold_column", COL_UNREAD,
            "color_column", COL_COLOUR,
            NULL);
    e_table_extras_add_cell(extras, "render_date", cell);
    
    /* text cell */
    cell = e_cell_text_new (NULL, GTK_JUSTIFY_LEFT);
    gtk_object_set (GTK_OBJECT (cell),
            "strikeout_column", COL_DELETED,
            "bold_column", COL_UNREAD,
            "color_column", COL_COLOUR,
            NULL);
    e_table_extras_add_cell(extras, "render_text", cell);
    
    e_table_extras_add_cell(extras, "render_tree", 
                e_cell_tree_new (NULL, NULL, /* let the tree renderer default the pixmaps */
                         TRUE, cell));

    /* size cell */
    cell = e_cell_size_new (NULL, GTK_JUSTIFY_RIGHT);
    gtk_object_set (GTK_OBJECT (cell),
            "strikeout_column", COL_DELETED,
            "bold_column", COL_UNREAD,
            "color_column", COL_COLOUR,
            NULL);
    e_table_extras_add_cell(extras, "render_size", cell);

    return extras;
}

static void
save_tree_state(MessageList *ml)
{
    char *filename;

    if (ml->folder == NULL || ml->tree == NULL)
        return;

    filename = mail_config_folder_to_cachename(ml->folder, "et-header-");
    e_tree_save_state(ml->tree, filename);
    g_free(filename);

    filename = mail_config_folder_to_cachename(ml->folder, "et-expanded-");
    e_tree_save_expanded_state(ml->tree, filename);
    g_free(filename);
}

#ifdef JUST_FOR_TRANSLATORS
static char *list [] = {
    N_("Status"), N_("Flagged"), N_("Score"), N_("Attachment"),
    N_("From"),   N_("Subject"), N_("Date"),  N_("Received"),
    N_("To"),     N_("Size")
};
#endif

char *
message_list_get_layout (MessageList *message_list)
{
    /* Default: Status, Attachments, Priority, From, Subject, Date */
    return g_strdup ("<ETableSpecification cursor-mode=\"line\" draw-grid=\"false\" draw-focus=\"true\" selection-mode=\"browse\">"
             "<ETableColumn model_col= \"0\" _title=\"Status\" pixbuf=\"status\" expansion=\"0.0\" minimum_width=\"18\" resizable=\"false\" cell=\"render_message_status\" compare=\"integer\" sortable=\"false\"/>"
             "<ETableColumn model_col= \"1\" _title=\"Flagged\" pixbuf=\"flagged\" expansion=\"0.0\" minimum_width=\"18\" resizable=\"false\" cell=\"render_flagged\" compare=\"integer\"/>"
             "<ETableColumn model_col= \"2\" _title=\"Score\" pixbuf=\"score\" expansion=\"0.0\" minimum_width=\"18\" resizable=\"false\" cell=\"render_score\" compare=\"integer\"/>"
             "<ETableColumn model_col= \"3\" _title=\"Attachment\" pixbuf=\"attachment\" expansion=\"0.0\" minimum_width=\"18\" resizable=\"false\" cell=\"render_attachment\" compare=\"integer\" sortable=\"false\"/>"
             "<ETableColumn model_col= \"4\" _title=\"From\" expansion=\"24.0\" minimum_width=\"32\" resizable=\"true\" cell=\"render_text\" compare=\"address_compare\"/>"
             "<ETableColumn model_col= \"5\" _title=\"Subject\" expansion=\"30.0\" minimum_width=\"32\" resizable=\"true\" cell=\"render_tree\" compare=\"subject_compare\"/>"
             "<ETableColumn model_col= \"6\" _title=\"Date\" expansion=\"24.0\" minimum_width=\"32\" resizable=\"true\" cell=\"render_date\" compare=\"integer\"/>"
             "<ETableColumn model_col= \"7\" _title=\"Received\" expansion=\"20.0\" minimum_width=\"32\" resizable=\"true\" cell=\"render_date\" compare=\"integer\"/>"
             "<ETableColumn model_col= \"8\" _title=\"To\" expansion=\"24.0\" minimum_width=\"32\" resizable=\"true\" cell=\"render_text\" compare=\"address_compare\"/>"
             "<ETableColumn model_col= \"9\" _title=\"Size\" expansion=\"6.0\" minimum_width=\"32\" resizable=\"true\" cell=\"render_size\" compare=\"integer\"/>"
             "<ETableState> <column source=\"0\"/> <column source=\"3\"/> <column source=\"1\"/>"
             "<column source=\"4\"/> <column source=\"5\"/> <column source=\"6\"/>"
             "<grouping> </grouping> </ETableState>"
             "</ETableSpecification>");
}

static void
message_list_setup_etree(MessageList *message_list, gboolean outgoing)
{
    /* build the spec based on the folder, and possibly from a saved file */
    /* otherwise, leave default */
    if (message_list->folder) {
        char *path;
        char *name;
        struct stat st;
        
        name = camel_service_get_name (CAMEL_SERVICE (message_list->folder->parent_store), TRUE);
        printf ("folder name is '%s'\n", name);

        path = mail_config_folder_to_cachename (message_list->folder, "et-header-");
        if (path && stat (path, &st) == 0 && st.st_size > 0 && S_ISREG (st.st_mode)) {
            /* build based on saved file */
            e_tree_load_state (message_list->tree, path);
        } else if (outgoing) {
            /* Swap From/To for Drafts, Sent, Outbox */
            char *state = "<ETableState>"
                "<column source=\"0\"/> <column source=\"1\"/> "
                "<column source=\"8\"/> <column source=\"5\"/> "
                "<column source=\"6\"/> <grouping> </grouping> </ETableState>";
            
            e_tree_set_state (message_list->tree, state);
        }
        g_free (path);
        
        path = mail_config_folder_to_cachename (message_list->folder, "et-expanded-");
        if (path && stat (path, &st) == 0 && st.st_size > 0 && S_ISREG (st.st_mode)) {
            /* build based on saved file */
            e_tree_load_expanded_state (message_list->tree, path);
        }
        g_free (path);

        g_free (name);
    }
}

/*
 * GtkObject::init
 */
static void
message_list_init (GtkObject *object)
{
    MessageList *message_list = MESSAGE_LIST (object);

    e_scroll_frame_set_policy (E_SCROLL_FRAME (message_list),
                   GTK_POLICY_AUTOMATIC, GTK_POLICY_ALWAYS);

    message_list->hidden = NULL;
    message_list->hidden_pool = NULL;
    message_list->hide_before = ML_HIDE_NONE_START;
    message_list->hide_after = ML_HIDE_NONE_END;

    message_list->hide_lock = g_mutex_new();

    message_list->uid_nodemap = g_hash_table_new (g_str_hash, g_str_equal);
}

static void
message_list_destroy (GtkObject *object)
{
    MessageList *message_list = MESSAGE_LIST (object);

    if (message_list->folder) {
        save_tree_state(message_list);
        hide_save_state(message_list);
    }

    gtk_object_unref (GTK_OBJECT (message_list->model));

    if (message_list->idle_id != 0)
        g_source_remove(message_list->idle_id);
    
    if (message_list->seen_id)
        gtk_timeout_remove (message_list->seen_id);
    
    if (message_list->folder) {
        camel_object_unhook_event((CamelObject *)message_list->folder, "folder_changed",
                      folder_changed, message_list);
        camel_object_unhook_event((CamelObject *)message_list->folder, "message_changed",
                      message_changed, message_list);
        camel_object_unref (CAMEL_OBJECT (message_list->folder));
    }

    if (message_list->hidden) {
        g_hash_table_destroy(message_list->hidden);
        e_mempool_destroy(message_list->hidden_pool);
        message_list->hidden = NULL;
        message_list->hidden_pool = NULL;
    }

    if (message_list->uid_nodemap) {
        g_hash_table_foreach(message_list->uid_nodemap, (GHFunc)clear_info, message_list);
        g_hash_table_destroy (message_list->uid_nodemap);
    }

    g_free(message_list->cursor_uid);

    g_mutex_free(message_list->hide_lock);

    GTK_OBJECT_CLASS (message_list_parent_class)->destroy (object);
}

/*
 * GtkObjectClass::init
 */
static void
message_list_class_init (GtkObjectClass *object_class)
{
    message_list_parent_class = gtk_type_class (PARENT_TYPE);

    object_class->destroy = message_list_destroy;

    message_list_signals[MESSAGE_SELECTED] =
        gtk_signal_new ("message_selected",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (MessageListClass, message_selected),
                gtk_marshal_NONE__STRING,
                GTK_TYPE_NONE, 1, GTK_TYPE_STRING);

    gtk_object_class_add_signals(object_class, message_list_signals, LAST_SIGNAL);

    message_list_init_images ();
}

static void
message_list_construct (MessageList *message_list)
{
    ETableExtras *extras;
    char *spec;

    message_list->model =
        e_tree_memory_callbacks_new (ml_tree_icon_at,

                         ml_column_count,

                         ml_has_save_id,
                         ml_get_save_id,

                         ml_has_get_node_by_id,
                         ml_get_node_by_id,

                         ml_tree_value_at,
                         ml_tree_set_value_at,
                         ml_tree_is_cell_editable,

                         ml_duplicate_value,
                         ml_free_value,
                         ml_initialize_value,
                         ml_value_is_empty,
                         ml_value_to_string,

                         message_list);
    gtk_object_ref (GTK_OBJECT (message_list->model));
    gtk_object_sink (GTK_OBJECT (message_list->model));

    e_tree_memory_set_expanded_default(E_TREE_MEMORY(message_list->model), TRUE);
    
    /*
     * The etree
     */
    spec = message_list_get_layout (message_list);
    extras = message_list_create_extras ();
    e_tree_scrolled_construct (E_TREE_SCROLLED (message_list),
                   message_list->model,
                   extras, spec, NULL);

    message_list->tree = e_tree_scrolled_get_tree(E_TREE_SCROLLED (message_list));
    e_tree_root_node_set_visible (message_list->tree, FALSE);

    g_free (spec);
    gtk_object_sink (GTK_OBJECT (extras));

    gtk_signal_connect (GTK_OBJECT (message_list->tree), "cursor_activated",
                GTK_SIGNAL_FUNC (on_cursor_activated_cmd),
                message_list);

    gtk_signal_connect (GTK_OBJECT (message_list->tree), "click",
                GTK_SIGNAL_FUNC (on_click), message_list);
    
    /* drag & drop */
    e_tree_drag_source_set (message_list->tree, GDK_BUTTON1_MASK,
                 drag_types, num_drag_types, GDK_ACTION_MOVE);
    
    gtk_signal_connect (GTK_OBJECT (message_list->tree), "drag_data_get",
                GTK_SIGNAL_FUNC (message_list_drag_data_get),
                message_list);
}

GtkWidget *
message_list_new (void)
{
    MessageList *message_list;

    message_list = MESSAGE_LIST (gtk_widget_new (message_list_get_type (),
                             "hadjustment", NULL,
                             "vadjustment", NULL,
                             NULL));
    message_list_construct (message_list);

    return GTK_WIDGET (message_list);
}

static void
clear_info(char *key, ETreePath *node, MessageList *ml)
{
    CamelMessageInfo *info;

    info = e_tree_memory_node_get_data((ETreeMemory *)ml->model, node);
    camel_folder_free_message_info(ml->folder, info);
}

static void
clear_tree (MessageList *ml)
{
    ETreeModel *etm = ml->model;

#ifdef TIMEIT
    struct timeval start, end;
    unsigned long diff;

    printf("Clearing tree\n");
    gettimeofday(&start, NULL);
#endif

    /* we also reset the uid_rowmap since it is no longer useful/valid anyway */
    if (ml->folder)
        g_hash_table_foreach(ml->uid_nodemap, (GHFunc)clear_info, ml);
    g_hash_table_destroy (ml->uid_nodemap);
    ml->uid_nodemap = g_hash_table_new(g_str_hash, g_str_equal);
    
    if (ml->tree_root) {
        /* we should be frozen already */
        e_tree_memory_node_remove (E_TREE_MEMORY(etm), ml->tree_root);
    }

    ml->tree_root = e_tree_memory_node_insert (E_TREE_MEMORY(etm), NULL, 0, NULL);

#ifdef TIMEIT
    gettimeofday(&end, NULL);
    diff = end.tv_sec * 1000 + end.tv_usec/1000;
    diff -= start.tv_sec * 1000 + start.tv_usec/1000;
    printf("Clearing tree took %ld.%03ld seconds\n", diff / 1000, diff % 1000);
#endif

}

/* we try and find something that isn't deleted in our tree
   there is actually no assurance that we'll find somethign that will
   still be there next time, but its probably going to work most of the time */
static char *find_next_undeleted(MessageList *ml)
{
    ETreePath node;
    int last;
    int vrow;
    ETree *et = ml->tree;
    CamelMessageInfo *info;

    node = g_hash_table_lookup(ml->uid_nodemap, ml->cursor_uid);
    if (node == NULL)
        return NULL;

    info = get_message_info (ml, node);
    if (info && (info->flags & CAMEL_MESSAGE_DELETED) == 0) {
        return NULL;
    }

    last = e_tree_row_count (ml->tree);

    /* model_to_view_row etc simply dont work for sorted views.  Sigh. */
    vrow = e_tree_row_of_node (et, node);

    /* We already checked this node. */
    vrow ++;

    while (vrow < last) {
        CamelMessageInfo *info;

        node = e_tree_node_at_row (et, vrow);
        info = get_message_info (ml, node);
        if (info && (info->flags & CAMEL_MESSAGE_DELETED) == 0) {
            return g_strdup (camel_message_info_uid(info));
        }
        vrow ++;
    }

    return NULL;
}

/* only call if we have a tree model */
/* builds the tree structure */
static void build_subtree (MessageList *ml, ETreePath parent, CamelFolderThreadNode *c, int *row);

static void build_subtree_diff (MessageList *ml, ETreePath parent, ETreePath path, CamelFolderThreadNode *c, int *row);

static void
build_tree (MessageList *ml, CamelFolderThread *thread, CamelFolderChangeInfo *changes)
{
    int row = 0;
    ETreeModel *etm = ml->model;
    ETreePath *top;
    char *saveuid = NULL;

#ifdef TIMEIT
    struct timeval start, end;
    unsigned long diff;

    printf("Building tree\n");
    gettimeofday(&start, NULL);
#endif

#ifdef TIMEIT
    gettimeofday(&end, NULL);
    diff = end.tv_sec * 1000 + end.tv_usec/1000;
    diff -= start.tv_sec * 1000 + start.tv_usec/1000;
    printf("Loading tree state took %ld.%03ld seconds\n", diff / 1000, diff % 1000);
#endif

    if (ml->tree_root == NULL) {
        ml->tree_root = e_tree_memory_node_insert(E_TREE_MEMORY(etm), NULL, 0, NULL);
    }

    if (ml->cursor_uid) {
        if (ml->hidedeleted) {
            saveuid = find_next_undeleted(ml);
        }
    }

#define BROKEN_ETREE    /* avoid some broken code in etree(?) by not using the incremental update */

    top = e_tree_model_node_get_first_child(etm, ml->tree_root);
#ifndef BROKEN_ETREE
    if (top == NULL || changes == NULL) {
#endif
        e_tree_memory_freeze(E_TREE_MEMORY(etm));
        clear_tree (ml);

        build_subtree(ml, ml->tree_root, thread->tree, &row);

        e_tree_memory_thaw(E_TREE_MEMORY(etm));
#ifndef BROKEN_ETREE
    } else {
        static int tree_equal(ETreeModel *etm, ETreePath ap, CamelFolderThreadNode *bp);

        build_subtree_diff(ml, ml->tree_root, top,  thread->tree, &row);
        top = e_tree_model_node_get_first_child(etm, ml->tree_root);
        tree_equal(ml->model, top, thread->tree);
    }
#endif

    if (saveuid) {
        ETreePath *node = g_hash_table_lookup(ml->uid_nodemap, saveuid);
        if (node == NULL) {
            g_free(ml->cursor_uid);
            ml->cursor_uid = NULL;
            gtk_signal_emit((GtkObject *)ml, message_list_signals[MESSAGE_SELECTED], NULL);
        } else {
            e_tree_set_cursor(ml->tree, node);
        }
        g_free(saveuid);
    } else if (ml->cursor_uid && !g_hash_table_lookup(ml->uid_nodemap, ml->cursor_uid)) {
        g_free(ml->cursor_uid);
        ml->cursor_uid = NULL;
        gtk_signal_emit((GtkObject *)ml, message_list_signals[MESSAGE_SELECTED], NULL);
    }
    
#ifdef TIMEIT
    gettimeofday(&end, NULL);
    diff = end.tv_sec * 1000 + end.tv_usec/1000;
    diff -= start.tv_sec * 1000 + start.tv_usec/1000;
    printf("Building tree took %ld.%03ld seconds\n", diff / 1000, diff % 1000);
#endif

}

/* this is about 20% faster than build_subtree_diff,
   entirely because e_tree_model_node_insert(xx, -1 xx)
   is faster than inserting to the right row :( */
/* Otherwise, this code would probably go as it does the same thing essentially */
static void
build_subtree (MessageList *ml, ETreePath parent, CamelFolderThreadNode *c, int *row)
{
    ETreeModel *tree = ml->model;
    ETreePath node;

    while (c) {
        /* phantom nodes no longer allowed */
        g_assert(c->message);

        node = e_tree_memory_node_insert(E_TREE_MEMORY(tree), parent, -1, (void *)c->message);
        g_hash_table_insert(ml->uid_nodemap, (void *)camel_message_info_uid(c->message), node);
        camel_folder_ref_message_info(ml->folder, (CamelMessageInfo *)c->message);

        if (c->child) {
            build_subtree(ml, node, c->child, row);
        }
        c = c->next;
    }
}

/* compares a thread tree node with the etable tree node to see if they point to
   the same object */
static int
node_equal(ETreeModel *etm, ETreePath ap, CamelFolderThreadNode *bp)
{
    CamelMessageInfo *info;

    info = e_tree_memory_node_get_data(E_TREE_MEMORY(etm), ap);

    if (bp->message && strcmp(camel_message_info_uid(info), camel_message_info_uid(bp->message))==0)
        return 1;

    return 0;
}

#ifndef BROKEN_ETREE
/* debug function - compare the two trees to see if they are the same */
static int
tree_equal(ETreeModel *etm, ETreePath ap, CamelFolderThreadNode *bp)
{
    CamelMessageInfo *info;

    while (ap && bp) {
        if (!node_equal(etm, ap, bp)) {
            g_warning("Nodes in tree differ");
            info = e_tree_memory_node_get_data(E_TREE_MEMORY(etm), ap);
            printf("table uid = %s\n", camel_message_info_uid(info));
            printf("camel uid = %s\n", camel_message_info_uid(bp->message));
            return FALSE;
        } else {
            if (!tree_equal(etm, e_tree_model_node_get_first_child(etm, ap), bp->child))
                return FALSE;
        }
        bp = bp->next;
        ap = e_tree_model_node_get_next(etm, ap);
    }

    if (ap || bp) {
        g_warning("Tree differs, out of nodes in one branch");
        if (ap) {
            info = e_tree_memory_node_get_data(E_TREE_MEMORY(etm), ap);
            if (info)
                printf("table uid = %s\n", camel_message_info_uid(info));
            else
                printf("info is empty?\n");
        }
        if (bp) {
            printf("camel uid = %s\n", camel_message_info_uid(bp->message));
            return FALSE;
        }
        return FALSE;
    }
    return TRUE;
}
#endif

/* adds a single node, retains save state, and handles adding children if required */
static void
add_node_diff(MessageList *ml, ETreePath parent, ETreePath path, CamelFolderThreadNode *c, int *row, int myrow)
{
    ETreeModel *etm = ml->model;
    ETreePath node;

    g_assert(c->message);
 
    /* we just update the hashtable key, umm, does this leak the info on the message node? */
    g_hash_table_remove(ml->uid_nodemap, camel_message_info_uid(c->message));
    node = e_tree_memory_node_insert(E_TREE_MEMORY(etm), parent, myrow, (void *)c->message);
    g_hash_table_insert(ml->uid_nodemap, (void *)camel_message_info_uid(c->message), node);
    camel_folder_ref_message_info(ml->folder, (CamelMessageInfo *)c->message);
    (*row)++;

    if (c->child) {
        build_subtree_diff(ml, node, NULL, c->child, row);
    }
}

/* removes node, children recursively and all associated data */
static void
remove_node_diff(MessageList *ml, ETreePath node, int depth)
{
    ETreeModel *etm = ml->model;
    ETreePath cp, cn;
    CamelMessageInfo *info;

    t(printf("Removing node: %s\n", (char *)e_tree_memory_node_get_data(etm, node)));

    /* we depth-first remove all node data's ... */
    cp = e_tree_model_node_get_first_child(etm, node);
    while (cp) {
        cn = e_tree_model_node_get_next(etm, cp);
        remove_node_diff(ml, cp, depth+1);
        cp = cn;
    }

    /* and the rowid entry - if and only if it is referencing this node */
    info = e_tree_memory_node_get_data(E_TREE_MEMORY (etm), node);

    /* and only at the toplevel, remove the node (etree should optimise this remove somewhat) */
    if (depth == 0)
        e_tree_memory_node_remove(E_TREE_MEMORY(etm), node);

    g_assert(info);
    g_hash_table_remove(ml->uid_nodemap, camel_message_info_uid(info));
    camel_folder_free_message_info(ml->folder, info);
}

/* applies a new tree structure to an existing tree, but only by changing things
   that have changed */
static void
build_subtree_diff(MessageList *ml, ETreePath parent, ETreePath path, CamelFolderThreadNode *c, int *row)
{
    ETreeModel *etm = ml->model;
    ETreePath ap, *ai, *at, *tmp;
    CamelFolderThreadNode *bp, *bi, *bt;
    int i, j, myrow = 0;

    ap = path;
    bp = c;

    while (ap || bp) {
        t(printf("Processing row: %d (subtree row %d)\n", *row, myrow));
        if (ap == NULL) {
            t(printf("out of old nodes\n"));
            /* ran out of old nodes - remaining nodes are added */
            add_node_diff(ml, parent, ap, bp, row, myrow);
            myrow++;
            bp = bp->next;
        } else if (bp == NULL) {
            t(printf("out of new nodes\n"));
            /* ran out of new nodes - remaining nodes are removed */
            tmp = e_tree_model_node_get_next(etm, ap);
            remove_node_diff(ml, ap, 0);
            ap = tmp;
        } else if (node_equal(etm, ap, bp)) {
            /*t(printf("nodes match, verify\n"));*/
            /* matching nodes, verify details/children */
#if 0
            if (bp->message) {
                char *olduid;
                int oldrow;
                /* if this is a message row, check/update the row id map */
                if (g_hash_table_lookup_extended(ml->uid_rowmap, camel_message_info_uid(bp->message), (void *)&olduid, (void *)&oldrow)) {
                    if (oldrow != (*row)) {
                        g_hash_table_insert(ml->uid_rowmap, olduid, (void *)(*row));
                    }
                } else {
                    g_warning("Cannot find uid %s in table?", camel_message_info_uid(bp->message));
                    /*g_assert_not_reached();*/
                }
            }
#endif
            *row = (*row)+1;
            myrow++;
            tmp = e_tree_model_node_get_first_child(etm, ap);
            /* make child lists match (if either has one) */
            if (bp->child || tmp) {
                build_subtree_diff(ml, ap, tmp, bp->child, row);
            }
            ap = e_tree_model_node_get_next(etm, ap);
            bp = bp->next;
        } else {
            t(printf("searching for matches\n"));
            /* we have to scan each side for a match */
            bi = bp->next;
            ai = e_tree_model_node_get_next(etm, ap);
            for (i=1;bi!=NULL;i++,bi=bi->next) {
                if (node_equal(etm, ap, bi))
                    break;
            }
            for (j=1;ai!=NULL;j++,ai=e_tree_model_node_get_next(etm, ai)) {
                if (node_equal(etm, ai, bp))
                    break;
            }
            if (i<j) {
                /* smaller run of new nodes - must be nodes to add */
                if (bi) {
                    bt = bp;
                    while (bt != bi) {
                        t(printf("adding new node 0\n"));
                        add_node_diff(ml, parent, NULL, bt, row, myrow);
                        myrow++;
                        bt = bt->next;
                    }
                    bp = bi;
                } else {
                    t(printf("adding new node 1\n"));
                    /* no match in new nodes, add one, try next */
                    add_node_diff(ml, parent, NULL, bp, row, myrow);
                    myrow++;
                    bp = bp->next;
                }
            } else {
                /* bigger run of old nodes - must be nodes to remove */
                if (ai) {
                    at = ap;
                    while (at != ai) {
                        t(printf("removing old node 0\n"));
                        tmp = e_tree_model_node_get_next(etm, at);
                        remove_node_diff(ml, at, 0);
                        at = tmp;
                    }
                    ap = ai;
                } else {
                    t(printf("adding new node 2\n"));
                    /* didn't find match in old nodes, must be new node? */
                    add_node_diff(ml, parent, NULL, bp, row, myrow);
                    myrow++;
                    bp = bp->next;
#if 0
                    tmp = e_tree_model_node_get_next(etm, ap);
                    remove_node_diff(etm, ap, 0);
                    ap = tmp;
#endif
                }
            }
        }
    }
}

#ifndef BROKEN_ETREE
static void build_flat_diff(MessageList *ml, CamelFolderChangeInfo *changes);
#endif

static void
build_flat (MessageList *ml, GPtrArray *summary, CamelFolderChangeInfo *changes)
{
    ETreeModel *etm = ml->model;
    ETreePath node;
    char *saveuid = NULL;
    int i;

#ifdef TIMEIT
    struct timeval start, end;
    unsigned long diff;

    printf("Building flat\n");
    gettimeofday(&start, NULL);
#endif

    if (ml->cursor_uid) {
        if (ml->hidedeleted) {
            saveuid = find_next_undeleted(ml);
        }
    }

#ifndef BROKEN_ETREE
    if (changes) {
        build_flat_diff(ml, changes);
    } else {
#endif
        e_tree_memory_freeze(E_TREE_MEMORY(etm));
        clear_tree (ml);
        for (i = 0; i < summary->len; i++) {
            CamelMessageInfo *info = summary->pdata[i];

            node = e_tree_memory_node_insert(E_TREE_MEMORY(etm), ml->tree_root, -1, info);
            g_hash_table_insert(ml->uid_nodemap, (void *)camel_message_info_uid(info), node);
            camel_folder_ref_message_info(ml->folder, info);
        }
        e_tree_memory_thaw(E_TREE_MEMORY(etm));

#ifndef BROKEN_ETREE
    }
#endif

    if (saveuid) {
        ETreePath *node = g_hash_table_lookup(ml->uid_nodemap, saveuid);
        if (node == NULL) {
            g_free(ml->cursor_uid);
            ml->cursor_uid = NULL;
            gtk_signal_emit((GtkObject *)ml, message_list_signals[MESSAGE_SELECTED], NULL);
        } else {
            e_tree_set_cursor(ml->tree, node);
        }
        g_free(saveuid);
    }

#ifdef TIMEIT
    gettimeofday(&end, NULL);
    diff = end.tv_sec * 1000 + end.tv_usec/1000;
    diff -= start.tv_sec * 1000 + start.tv_usec/1000;
    printf("Building flat took %ld.%03ld seconds\n", diff / 1000, diff % 1000);
#endif

}

#ifndef BROKEN_ETREE

static void
build_flat_diff(MessageList *ml, CamelFolderChangeInfo *changes)
{
    int i;
    ETreePath node;
    CamelMessageInfo *info;

#ifdef TIMEIT
    struct timeval start, end;
    unsigned long diff;
        
    gettimeofday(&start, NULL);
#endif

    printf("updating changes to display\n");

    /* remove individual nodes? */
    d(printf("Removing messages from view:\n"));
    for (i=0;i<changes->uid_removed->len;i++) {
        node = g_hash_table_lookup(ml->uid_nodemap, changes->uid_removed->pdata[i]);
        if (node) {
            info = e_tree_memory_node_get_data(E_TREE_MEMORY(ml->model), node);
            e_tree_memory_node_remove(E_TREE_MEMORY(ml->model), node);
            camel_folder_free_message_info(ml->folder, info);
            g_hash_table_remove(ml->uid_nodemap, changes->uid_removed->pdata[i]);
        }
    }

    /* add new nodes? - just append to the end */
    d(printf("Adding messages to view:\n"));
    for (i=0;i<changes->uid_added->len;i++) {
        info = camel_folder_get_message_info(ml->folder, changes->uid_added->pdata[i]);
        if (info) {
            d(printf(" %s\n", (char *)changes->uid_added->pdata[i]));
            node = e_tree_memory_node_insert(E_TREE_MEMORY(ml->model), ml->tree_root, -1, info);
            g_hash_table_insert(ml->uid_nodemap, (void *)camel_message_info_uid(info), node);
        }
    }

    /* and update changes too */
    d(printf("Changing messages to view:\n"));
    for (i=0;i<changes->uid_changed->len;i++) {
        ETreePath *node = g_hash_table_lookup(ml->uid_nodemap, changes->uid_changed->pdata[i]);
        if (node)
            e_tree_model_node_data_changed(ml->model, node);
    }

#ifdef TIMEIT
    gettimeofday(&end, NULL);
    diff = end.tv_sec * 1000 + end.tv_usec/1000;
    diff -= start.tv_sec * 1000 + start.tv_usec/1000;
    printf("Inserting changes took %ld.%03ld seconds\n", diff / 1000, diff % 1000);
#endif

}
#endif /* ! BROKEN_ETREE */

static void
main_folder_changed (CamelObject *o, gpointer event_data, gpointer user_data)
{
    MessageList *ml = MESSAGE_LIST (user_data);
    CamelFolderChangeInfo *changes = (CamelFolderChangeInfo *)event_data, *newchanges;
    CamelMessageInfo *info;
    CamelFolder *folder = (CamelFolder *)o;
    int i;

    printf("folder changed event, changes = %p\n", changes);
    if (changes) {
        printf("changed = %d added = %d removed = %d\n",
               changes->uid_changed->len, changes->uid_added->len, changes->uid_removed->len);

        /* check if the hidden state has changed, if so modify accordingly, then regenerate */
        if (ml->hidedeleted) {
            newchanges = camel_folder_change_info_new();
            
            for (i=0;i<changes->uid_changed->len;i++) {
                ETreePath node = g_hash_table_lookup (ml->uid_nodemap, changes->uid_changed->pdata[i]);

                info = camel_folder_get_message_info(folder, changes->uid_changed->pdata[i]);
                if (node != NULL && info != NULL && (info->flags & CAMEL_MESSAGE_DELETED) != 0) {
                    camel_folder_change_info_remove_uid(newchanges, changes->uid_changed->pdata[i]);
                } else if (node == NULL && info != NULL && (info->flags & CAMEL_MESSAGE_DELETED) == 0) {
                    camel_folder_change_info_add_uid(newchanges, changes->uid_changed->pdata[i]);
                } else {
                    camel_folder_change_info_change_uid(newchanges, changes->uid_changed->pdata[i]);
                }
                camel_folder_free_message_info(folder, info);
            }
            
            if (newchanges->uid_added->len > 0 || newchanges->uid_removed->len > 0) {
                for (i=0;i<changes->uid_added->len;i++)
                    camel_folder_change_info_add_uid(newchanges, changes->uid_added->pdata[i]);
                for (i=0;i<changes->uid_removed->len;i++)
                    camel_folder_change_info_remove_uid(newchanges, changes->uid_removed->pdata[i]);
                camel_folder_change_info_free(changes);
                changes = newchanges;
            } else {
                camel_folder_change_info_free(newchanges);
            }
        }

        if (changes->uid_added->len == 0 && changes->uid_removed->len == 0 && changes->uid_changed->len < 100) {
            for (i=0;i<changes->uid_changed->len;i++) {
                ETreePath node = g_hash_table_lookup (ml->uid_nodemap, changes->uid_changed->pdata[i]);
                if (node)
                    e_tree_model_node_data_changed(ml->model, node);
            }

            camel_folder_change_info_free(changes);
            return;
        }
    }

    mail_regen_list(ml, ml->search, NULL, changes);
}

static void
folder_changed (CamelObject *o, gpointer event_data, gpointer user_data)
{
    /* similarly to message_changed, copy the change list and propagate it to
       the main thread and free it */
    CamelFolderChangeInfo *changes;

    if (event_data) {
        changes = camel_folder_change_info_new();
        camel_folder_change_info_cat(changes, (CamelFolderChangeInfo *)event_data);
    } else {
        changes = NULL;
    }
    mail_proxy_event (main_folder_changed, o, changes, user_data);
}

static void
main_message_changed (CamelObject *o, gpointer uid, gpointer user_data)
{
    MessageList *ml = MESSAGE_LIST (user_data);
    CamelFolderChangeInfo *changes;

    changes = camel_folder_change_info_new();
    camel_folder_change_info_change_uid(changes, uid);
    main_folder_changed(o, changes, ml);
    g_free(uid);
}

static void
message_changed (CamelObject *o, gpointer event_data, gpointer user_data)
{
    /* Here we copy the data because our thread may free the copy that we would reference.
     * The other thread would be passed a uid parameter that pointed to freed data.
     * We copy it and free it in the handler. 
     */
    mail_proxy_event (main_message_changed, o, g_strdup ((gchar *)event_data), user_data);
}

void
message_list_set_folder (MessageList *message_list, CamelFolder *camel_folder, gboolean outgoing)
{
    CamelException ex;

    g_return_if_fail (message_list != NULL);
    g_return_if_fail (IS_MESSAGE_LIST (message_list));

    if (message_list->folder == camel_folder)
        return;

    camel_exception_init (&ex);

    clear_tree(message_list);
    
    if (message_list->folder) {
        hide_save_state(message_list);
        camel_object_unhook_event((CamelObject *)message_list->folder, "folder_changed",
                      folder_changed, message_list);
        camel_object_unhook_event((CamelObject *)message_list->folder, "message_changed",
                      message_changed, message_list);
        camel_object_unref (CAMEL_OBJECT (message_list->folder));
    }

    message_list->folder = camel_folder;

    if (message_list->cursor_uid) {
        g_free(message_list->cursor_uid);
        message_list->cursor_uid = NULL;
        gtk_signal_emit((GtkObject *)message_list, message_list_signals[MESSAGE_SELECTED], NULL);
    }

    if (camel_folder) {
        /* build the etree suitable for this folder */
        message_list_setup_etree(message_list, outgoing);
        
        camel_object_hook_event(CAMEL_OBJECT (camel_folder), "folder_changed",
                    folder_changed, message_list);
        camel_object_hook_event(CAMEL_OBJECT (camel_folder), "message_changed",
                    message_changed, message_list);
        
        camel_object_ref (CAMEL_OBJECT (camel_folder));

        message_list->hidedeleted = !(CAMEL_IS_VTRASH_FOLDER(camel_folder));

        hide_load_state(message_list);
        mail_regen_list(message_list, message_list->search, NULL, NULL);
    }
}

E_MAKE_TYPE (message_list, "MessageList", MessageList, message_list_class_init, message_list_init, PARENT_TYPE);

static gboolean
on_cursor_activated_idle (gpointer data)
{
    MessageList *message_list = data;

    printf("emitting cursor changed signal, for uid %s\n", message_list->cursor_uid);
    gtk_signal_emit(GTK_OBJECT (message_list), message_list_signals [MESSAGE_SELECTED], message_list->cursor_uid);

    message_list->idle_id = 0;
    return FALSE;
}

static void
on_cursor_activated_cmd (ETree *tree, int row, ETreePath path, gpointer user_data)
{
    MessageList *message_list;
    const char *new_uid;
    
    message_list = MESSAGE_LIST (user_data);

    if (path == NULL)
        new_uid = NULL;
    else
        new_uid = get_message_uid(message_list, path);

    if (message_list->cursor_uid != NULL && !strcmp (message_list->cursor_uid, new_uid))
        return;

    message_list->cursor_row = row;
    g_free(message_list->cursor_uid);
    message_list->cursor_uid = g_strdup (new_uid);

    if (!message_list->idle_id) {
        message_list->idle_id =
            g_idle_add_full (G_PRIORITY_LOW, on_cursor_activated_idle,
                     message_list, NULL);
    }
}

static gint
on_click (ETree *tree, gint row, ETreePath path, gint col, GdkEvent *event, MessageList *list)
{
    int flag;
    CamelMessageInfo *info;

    if (col == COL_MESSAGE_STATUS)
        flag = CAMEL_MESSAGE_SEEN;
    else if (col == COL_FLAGGED)
        flag = CAMEL_MESSAGE_FLAGGED;
    else
        return FALSE;

    info = get_message_info(list, path);
    if (info == NULL) {
        return FALSE;
    }
    
    camel_folder_set_message_flags(list->folder, camel_message_info_uid(info), flag, ~info->flags);

    if (flag == CAMEL_MESSAGE_SEEN && list->seen_id) {
        gtk_timeout_remove (list->seen_id);
        list->seen_id = 0;
    }

    return TRUE;
}

struct message_list_foreach_data {
    MessageList *message_list;
    MessageListForeachFunc callback;
    gpointer user_data;
};

static void
mlfe_callback (int row, gpointer user_data)
{
    struct message_list_foreach_data *mlfe_data = user_data;
    const char *uid;

    uid = get_message_uid (mlfe_data->message_list, e_tree_node_at_row(mlfe_data->message_list->tree, row));
    if (uid) {
        mlfe_data->callback (mlfe_data->message_list,
                     uid,
                     mlfe_data->user_data);
    }
}

void
message_list_foreach (MessageList *message_list,
              MessageListForeachFunc callback,
              gpointer user_data)
{
    struct message_list_foreach_data mlfe_data;

    mlfe_data.message_list = message_list;
    mlfe_data.callback = callback;
    mlfe_data.user_data = user_data;
    e_tree_selected_row_foreach (message_list->tree,
                     mlfe_callback, &mlfe_data);
}

/* set whether we are in threaded view or flat view */
void
message_list_set_threaded(MessageList *ml, gboolean threaded)
{
    if (ml->threaded ^ threaded) {
        ml->threaded = threaded;

        mail_regen_list(ml, ml->search, NULL, NULL);
    }
}

void
message_list_set_hidedeleted(MessageList *ml, gboolean hidedeleted)
{
    if (ml->folder && CAMEL_IS_VTRASH_FOLDER(ml->folder))
        hidedeleted = FALSE;

    if (ml->hidedeleted ^ hidedeleted) {
        ml->hidedeleted = hidedeleted;

        mail_regen_list(ml, ml->search, NULL, NULL);
    }
}

void
message_list_set_search(MessageList *ml, const char *search)
{
    if (search == NULL || search[0] == '\0')
        if (ml->search == NULL || ml->search[0]=='\0')
            return;

    if (search != NULL && ml->search !=NULL && strcmp(search, ml->search)==0)
        return;

    mail_regen_list(ml, search, NULL, NULL);
}

/* returns the number of messages displayable *after* expression hiding has taken place */
unsigned int
message_list_length(MessageList *ml)
{
    return ml->hide_unhidden;
}

/* add a new expression to hide, or set the range.
   @expr: A new search expression - all matching messages will be hidden.  May be %NULL.
   @lower: Use ML_HIDE_NONE_START to specify no messages hidden from the start of the list.
   @upper: Use ML_HIDE_NONE_END to specify no message hidden from the end of the list.

   For either @upper or @lower, use ML_HIDE_SAME, to keep the previously set hide range.
   If either range is negative, then the range is taken from the end of the available list
   of messages, once other hiding has been performed.  Use message_list_length() to find out
   how many messages are available for hiding.

   Example: hide_add(ml, NULL, -100, ML_HIDE_NONE_END) -> hide all but the last (most recent)
   100 messages.
*/
void
message_list_hide_add(MessageList *ml, const char *expr, unsigned int lower, unsigned int upper)
{
    MESSAGE_LIST_LOCK(ml, hide_lock);

    if (lower != ML_HIDE_SAME)
        ml->hide_before = lower;
    if (upper != ML_HIDE_SAME)
        ml->hide_after = upper;

    MESSAGE_LIST_UNLOCK(ml, hide_lock);

    mail_regen_list(ml, ml->search, expr, NULL);
}

/* hide specific uid's */
void
message_list_hide_uids(MessageList *ml, GPtrArray *uids)
{
    int i;
    char *uid;

    /* first see if we need to do any work, if so, then do it all at once */
    for (i=0;i<uids->len;i++) {
        if (g_hash_table_lookup(ml->uid_nodemap, uids->pdata[i])) {
            MESSAGE_LIST_LOCK(ml, hide_lock);
            if (ml->hidden == NULL) {
                ml->hidden = g_hash_table_new(g_str_hash, g_str_equal);
                ml->hidden_pool = e_mempool_new(512, 256, E_MEMPOOL_ALIGN_BYTE);
            }
    
            uid =  e_mempool_strdup(ml->hidden_pool, uids->pdata[i]);
            g_hash_table_insert(ml->hidden, uid, uid);
            for (;i<uids->len;i++) {
                if (g_hash_table_lookup(ml->uid_nodemap, uids->pdata[i])) {
                    uid =  e_mempool_strdup(ml->hidden_pool, uids->pdata[i]);
                    g_hash_table_insert(ml->hidden, uid, uid);
                }
            }
            MESSAGE_LIST_UNLOCK(ml, hide_lock);
            mail_regen_list(ml, ml->search, NULL, NULL);
            break;
        }
    }
}

/* no longer hide any messages */
void
message_list_hide_clear (MessageList *ml)
{
    MESSAGE_LIST_LOCK(ml, hide_lock);
    if (ml->hidden) {
        g_hash_table_destroy(ml->hidden);
        e_mempool_destroy(ml->hidden_pool);
        ml->hidden = NULL;
        ml->hidden_pool = NULL;
    }
    ml->hide_before = ML_HIDE_NONE_START;
    ml->hide_after = ML_HIDE_NONE_END;
    MESSAGE_LIST_UNLOCK(ml, hide_lock);

    mail_regen_list(ml, ml->search, NULL, NULL);
}

#define HIDE_STATE_VERSION (1)

/* version 1 file is:
   uintf    1
   uintf    hide_before
   uintf        hide_after
   string*  uids
*/

static void
hide_load_state (MessageList *ml)
{
    char *filename;
    FILE *in;
    guint32 version, lower, upper;

    filename = mail_config_folder_to_cachename(ml->folder, "hidestate-");
    in = fopen(filename, "r");
    if (in) {
        camel_file_util_decode_fixed_int32 (in, &version);
        if (version == HIDE_STATE_VERSION) {
            MESSAGE_LIST_LOCK(ml, hide_lock);
            if (ml->hidden == NULL) {
                ml->hidden = g_hash_table_new(g_str_hash, g_str_equal);
                ml->hidden_pool = e_mempool_new(512, 256, E_MEMPOOL_ALIGN_BYTE);
            }
            camel_file_util_decode_fixed_int32 (in, &lower);
            ml->hide_before = lower;
            camel_file_util_decode_fixed_int32 (in, &upper);
            ml->hide_after = upper;
            while (!feof(in)) {
                char *olduid, *uid;
                
                if (camel_file_util_decode_string (in, &olduid) != -1) {
                    uid =  e_mempool_strdup(ml->hidden_pool, olduid);
                    g_free (olduid);
                    g_hash_table_insert(ml->hidden, uid, uid);
                }
            }
            MESSAGE_LIST_UNLOCK(ml, hide_lock);
        }
        fclose(in);
    }
    g_free(filename);
}

static void
hide_save_1 (char *uid, char *keydata, FILE *out)
{
    camel_file_util_encode_string (out, uid);
}

/* save the hide state.  Note that messages are hidden by uid, if the uid's change, then
   this will become invalid, but is easy to reset in the ui */
static void
hide_save_state (MessageList *ml)
{
    char *filename;
    FILE *out;

    MESSAGE_LIST_LOCK(ml, hide_lock);

    filename = mail_config_folder_to_cachename(ml->folder, "hidestate-");
    if (ml->hidden == NULL && ml->hide_before == ML_HIDE_NONE_START && ml->hide_after == ML_HIDE_NONE_END) {
        unlink(filename);
    } else if ((out = fopen (filename, "w"))) {
        camel_file_util_encode_fixed_int32 (out, HIDE_STATE_VERSION);
        camel_file_util_encode_fixed_int32 (out, ml->hide_before);
        camel_file_util_encode_fixed_int32 (out, ml->hide_after);
        if (ml->hidden)
            g_hash_table_foreach(ml->hidden, (GHFunc)hide_save_1, out);
        fclose(out);
    }
    g_free (filename);

    MESSAGE_LIST_UNLOCK(ml, hide_lock);
}

/* ** REGENERATE MESSAGELIST ********************************************** */
struct _regen_list_msg {
    struct _mail_msg msg;

    MessageList *ml;
    char *search;
    char *hideexpr;
    CamelFolderChangeInfo *changes;
    gboolean dotree;    /* we are building a tree */
    gboolean hidedel;   /* we want to/dont want to show deleted messages */
    CamelFolderThread *tree;

    CamelFolder *folder;
    GPtrArray *summary;
};

/*
  maintain copy of summary

  any new messages added
  any removed removed, etc.

  use vfolder to implement searches ???

 */
static void regen_list_regen(struct _mail_msg *mm)
{
    struct _regen_list_msg *m = (struct _regen_list_msg *)mm;
    int i;
    GPtrArray *uids, *uidnew, *showuids;
    CamelMessageInfo *info;

    if (m->search)
        uids = camel_folder_search_by_expression(m->folder, m->search, &mm->ex);
    else
        uids = camel_folder_get_uids(m->folder);

    if (camel_exception_is_set(&mm->ex))
        return;

    /* perform hiding */
    if (m->hideexpr) {
        uidnew = camel_folder_search_by_expression(m->ml->folder, m->hideexpr, &mm->ex);
        /* well, lets not abort just because this faileld ... */
        camel_exception_clear(&mm->ex);

        if (uidnew) {
            MESSAGE_LIST_LOCK(m->ml, hide_lock);

            if (m->ml->hidden == NULL) {
                m->ml->hidden = g_hash_table_new(g_str_hash, g_str_equal);
                m->ml->hidden_pool = e_mempool_new(512, 256, E_MEMPOOL_ALIGN_BYTE);
            }
            
            for (i=0;i<uidnew->len;i++) {
                if (g_hash_table_lookup(m->ml->hidden, uidnew->pdata[i]) == 0) {
                    char *uid = e_mempool_strdup(m->ml->hidden_pool, uidnew->pdata[i]);
                    g_hash_table_insert(m->ml->hidden, uid, uid);
                }
            }

            MESSAGE_LIST_UNLOCK(m->ml, hide_lock);

            camel_folder_search_free(m->ml->folder, uidnew);
        }
    }

    MESSAGE_LIST_LOCK(m->ml, hide_lock);

    m->ml->hide_unhidden = uids->len;

    /* what semantics do we want from hide_before, hide_after?
       probably <0 means measure from the end of the list */

    /* perform uid hiding */
    if (m->ml->hidden || m->ml->hide_before != ML_HIDE_NONE_START || m->ml->hide_after != ML_HIDE_NONE_END) {
        int start, end;
        uidnew = g_ptr_array_new();

        /* first, hide matches */
        if (m->ml->hidden) {
            for (i=0;i<uids->len;i++) {
                if (g_hash_table_lookup(m->ml->hidden, uids->pdata[i]) == 0)
                    g_ptr_array_add(uidnew, uids->pdata[i]);
            }
        }

        /* then calculate the subrange visible and chop it out */
        m->ml->hide_unhidden = uidnew->len;

        if (m->ml->hide_before != ML_HIDE_NONE_START || m->ml->hide_after != ML_HIDE_NONE_END) {
            GPtrArray *uid2 = g_ptr_array_new();

            start = m->ml->hide_before;
            if (start < 0)
                start += m->ml->hide_unhidden;
            end = m->ml->hide_after;
            if (end < 0)
                end += m->ml->hide_unhidden;

            start = MAX(start, 0);
            end = MIN(end, uidnew->len);
            for (i=start;i<end;i++) {
                g_ptr_array_add(uid2, uidnew->pdata[i]);
            }

            g_ptr_array_free(uidnew, TRUE);
            uidnew = uid2;
        }
        showuids = uidnew;
    } else {
        uidnew = NULL;
        showuids = uids;
    }

    MESSAGE_LIST_UNLOCK(m->ml, hide_lock);

    m->summary = g_ptr_array_new();
    for (i=0;i<showuids->len;i++) {
        info = camel_folder_get_message_info(m->folder, showuids->pdata[i]);
        if (info) {
            /* FIXME: should this be taken account of in above processing? */
            if (m->hidedel && (info->flags & CAMEL_MESSAGE_DELETED) != 0)
                camel_folder_free_message_info(m->folder, info);
            else
                g_ptr_array_add(m->summary, info);
        }
    }

    if (uidnew)
        g_ptr_array_free(uidnew, TRUE);

    if (m->search)
        camel_folder_search_free(m->folder, uids);
    else
        camel_folder_free_uids(m->folder, uids);

    if (m->dotree)
        m->tree = camel_folder_thread_messages_new_summary(m->summary);
    else
        m->tree = NULL;
}

static void regen_list_regened(struct _mail_msg *mm)
{
    struct _regen_list_msg *m = (struct _regen_list_msg *)mm;

    if (m->summary == NULL)
        return;

    if (m->dotree)
        build_tree(m->ml, m->tree, m->changes);
    else
        build_flat(m->ml, m->summary, m->changes);
}

static void regen_list_free(struct _mail_msg *mm)
{
    struct _regen_list_msg *m = (struct _regen_list_msg *)mm;
    int i;

    if (m->summary) {
        for (i=0;i<m->summary->len;i++)
            camel_folder_free_message_info(m->folder, m->summary->pdata[i]);
        g_ptr_array_free(m->summary, TRUE);
    }

    if (m->tree)
        camel_folder_thread_messages_destroy(m->tree);

        if (m->ml->search && m->ml->search != m->search)
                g_free(m->ml->search);
    m->ml->search = m->search;

    g_free(m->hideexpr);

    camel_object_unref((CamelObject *)m->folder);

    if (m->changes)
        camel_folder_change_info_free(m->changes);

    gtk_object_unref((GtkObject *)m->ml);
}

static struct _mail_msg_op regen_list_op = {
    NULL,
    regen_list_regen,
    regen_list_regened,
    regen_list_free,
};

static void
mail_regen_list(MessageList *ml, const char *search, const char *hideexpr, CamelFolderChangeInfo *changes)
{
    struct _regen_list_msg *m;

    if (ml->folder == NULL)
        return;

#ifndef BROKEN_ETREE
    /* this can sometimes crash,so ... */

    /* see if we need to goto the child thread at all anyway */
    /* currently the only case is the flat view with updates and no search */
    if (hideexpr == NULL && search == NULL && changes != NULL && !ml->threaded) {
        build_flat_diff(ml, changes);
        camel_folder_change_info_free(changes);
        return;
    }
#endif

    m = mail_msg_new(&regen_list_op, NULL, sizeof(*m));
    m->ml = ml;
    m->search = g_strdup(search);
    m->hideexpr = g_strdup(hideexpr);
    m->changes = changes;
    m->dotree = ml->threaded;
    m->hidedel = ml->hidedeleted;
    gtk_object_ref((GtkObject *)ml);
    m->folder = ml->folder;
    camel_object_ref((CamelObject *)m->folder);

    e_thread_put(mail_thread_new, (EMsg *)m);
}