src/filtering.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2007 Hiroyuki Yamamoto & The Claws Mail Team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include "defs.h"
  21 #include <glib.h>
  22 #include <glib/gi18n.h>
  23 #include <ctype.h>
  24 #include <string.h>
  25 #include <stdlib.h>
  26 #include <errno.h>
  27 #include <gtk/gtk.h>
  28 #include <stdio.h>
  29
  30 #include "utils.h"
  31 #include "procheader.h"
  32 #include "matcher.h"
  33 #include "filtering.h"
  34 #include "prefs_gtk.h"
  35 #include "compose.h"
  36 #include "prefs_common.h"
  37
  38 #define PREFSBUFSIZE            1024
  39
  40 GSList * pre_global_processing = NULL;
  41 GSList * post_global_processing = NULL;
  42 GSList * filtering_rules = NULL;
  43
  44 static gboolean filtering_is_final_action(FilteringAction *filtering_action);
  45
  46 #define STRLEN_WITH_CHECK(expr) \
  47         strlen_with_check(#expr, __LINE__, expr)
  48
  49 static inline gint strlen_with_check(const gchar *expr, gint fline, const gchar *str)
  50 {
  51         if (str)
  52                 return strlen(str);
  53         else {
  54                 debug_print("%s(%d) - invalid string %s\n", __FILE__, fline, expr);
  55                 return 0;
  56         }
  57 }
  58
  59 FilteringAction * filteringaction_new(int type, int account_id,
  60                                       gchar * destination,
  61                                       gint labelcolor, gint score)
  62 {
  63         FilteringAction * action;
  64
  65         action = g_new0(FilteringAction, 1);
  66
  67         action->type = type;
  68         action->account_id = account_id;
  69         if (destination) {
  70                 action->destination       = g_strdup(destination);
  71         } else {
  72                 action->destination       = NULL;
  73         }
  74         action->labelcolor = labelcolor;
  75         action->score = score;
  76         return action;
  77 }
  78
  79 void filteringaction_free(FilteringAction * action)
  80 {
  81         g_return_if_fail(action);
  82         g_free(action->destination);
  83         g_free(action);
  84 }
  85
  86 FilteringProp * filteringprop_new(gboolean enabled,
  87                                   const gchar *name,
  88                                   gint account_id,
  89                                   MatcherList * matchers,
  90                                   GSList * action_list)
  91 {
  92         FilteringProp * filtering;
  93
  94         filtering = g_new0(FilteringProp, 1);
  95         filtering->enabled = enabled;
  96         filtering->name = name ? g_strdup(name): NULL;
  97         filtering->account_id = account_id;
  98         filtering->matchers = matchers;
  99         filtering->action_list = action_list;
 100
 101         return filtering;
 102 }
 103
 104 static FilteringAction * filteringaction_copy(FilteringAction * src)
 105 {
 106         FilteringAction * new;
 107
 108         new = g_new0(FilteringAction, 1);
 109
 110         new->type = src->type;
 111         new->account_id = src->account_id;
 112         if (src->destination)
 113                 new->destination = g_strdup(src->destination);
 114         else
 115                 new->destination = NULL;
 116         new->labelcolor = src->labelcolor;
 117         new->score = src->score;
 118
 119         return new;
 120 }
 121
 122 FilteringProp * filteringprop_copy(FilteringProp *src)
 123 {
 124         FilteringProp * new;
 125         GSList *tmp;
 126
 127         new = g_new0(FilteringProp, 1);
 128         new->matchers = g_new0(MatcherList, 1);
 129
 130         for (tmp = src->matchers->matchers; tmp != NULL && tmp->data != NULL;) {
 131                 MatcherProp *matcher = (MatcherProp *)tmp->data;
 132
 133                 new->matchers->matchers = g_slist_append(new->matchers->matchers,
 134                                                    matcherprop_copy(matcher));
 135                 tmp = tmp->next;
 136         }
 137
 138         new->matchers->bool_and = src->matchers->bool_and;
 139
 140         new->action_list = NULL;
 141
 142         for (tmp = src->action_list ; tmp != NULL ; tmp = tmp->next) {
 143                 FilteringAction *filtering_action;
 144
 145                 filtering_action = tmp->data;
 146
 147                 new->action_list = g_slist_append(new->action_list,
 148                     filteringaction_copy(filtering_action));
 149         }
 150
 151         new->enabled = src->enabled;
 152         new->name = g_strdup(src->name);
 153
 154         return new;
 155 }
 156
 157 void filteringprop_free(FilteringProp * prop)
 158 {
 159         GSList * tmp;
 160
 161         g_return_if_fail(prop);
 162         matcherlist_free(prop->matchers);
 163
 164         for (tmp = prop->action_list ; tmp != NULL ; tmp = tmp->next) {
 165                 filteringaction_free(tmp->data);
 166         }
 167         g_free(prop->name);
 168         g_free(prop);
 169 }
 170
 171 void filtering_move_and_copy_msg(MsgInfo *msginfo)
 172 {
 173         GSList *list = g_slist_append(NULL, msginfo);
 174         filtering_move_and_copy_msgs(list);
 175         g_slist_free(list);
 176 }
 177
 178 /* move and copy messages by batches to be faster on IMAP */
 179 void filtering_move_and_copy_msgs(GSList *msgs)
 180 {
 181         GSList *messages = g_slist_copy(msgs);
 182         FolderItem *last_item = NULL;
 183         gboolean is_copy = FALSE, is_move = FALSE;
 184         debug_print("checking %d messages\n", g_slist_length(msgs));
 185         while (messages) {
 186                 GSList *batch = NULL, *cur;
 187                 gint found = 0;
 188                 for (cur = messages; cur; cur = cur->next) {
 189                         MsgInfo *info = (MsgInfo *)cur->data;
 190                         if (last_item == NULL) {
 191                                 last_item = info->to_filter_folder;
 192                         }
 193                         if (last_item == NULL)
 194                                 continue;
 195                         if (!is_copy && !is_move) {
 196                                 if (info->is_copy)
 197                                         is_copy = TRUE;
 198                                 else if (info->is_move)
 199                                         is_move = TRUE;
 200                         }
 201                         found++;
 202                         if (info->to_filter_folder == last_item
 203                         &&  info->is_copy == is_copy
 204                         &&  info->is_move == is_move) {
 205                                 batch = g_slist_prepend(batch, info);
 206                         }
 207                 }
 208                 if (found == 0) {
 209                         debug_print("no more messages to move/copy\n");
 210                         break;
 211                 } else {
 212                         debug_print("%d messages to %s in %s\n", found,
 213                                 is_copy ? "copy":"move", last_item->name ? last_item->name:"(noname)");
 214                 }
 215                 for (cur = batch; cur; cur = cur->next) {
 216                         MsgInfo *info = (MsgInfo *)cur->data;
 217                         messages = g_slist_remove(messages, info);
 218                 }
 219                 batch = g_slist_reverse(batch);
 220                 if (g_slist_length(batch)) {
 221                         MsgInfo *info = (MsgInfo *)batch->data;
 222                         if (is_copy && last_item != info->folder) {
 223                                 folder_item_copy_msgs(last_item, batch);
 224                         } else if (is_move && last_item != info->folder) {
 225                                 if (folder_item_move_msgs(last_item, batch) < 0)
 226                                         folder_item_move_msgs(
 227                                                 folder_get_default_inbox(),
 228                                                 batch);
 229                         }
 230                         /* we don't reference the msginfos, because caller will do */
 231                         g_slist_free(batch);
 232                         batch = NULL;
 233                 }
 234                 last_item = NULL;
 235                 is_copy = FALSE;
 236                 is_move = FALSE;
 237         }
 238         /* we don't reference the msginfos, because caller will do */
 239         g_slist_free(messages);
 240 }
 241
 242 /*
 243   fitleringaction_apply
 244   runs the action on one MsgInfo
 245   return value : return TRUE if the action could be applied
 246 */
 247
 248 static gboolean filteringaction_apply(FilteringAction * action, MsgInfo * info)
 249 {
 250         FolderItem * dest_folder;
 251         gint val;
 252         Compose * compose;
 253         PrefsAccount * account;
 254         gchar * cmd;
 255
 256         switch(action->type) {
 257         case MATCHACTION_MOVE:
 258                 dest_folder =
 259                         folder_find_item_from_identifier(action->destination);
 260                 if (!dest_folder) {
 261                         debug_print("*** folder not found '%s'\n",
 262                                 action->destination ?action->destination :"");
 263                         return FALSE;
 264                 }
 265
 266                 /* check if mail is set to copy already,
 267                  * in which case we have to do it */
 268                 if (info->is_copy && info->to_filter_folder) {
 269                         debug_print("should cp and mv !\n");
 270                         folder_item_copy_msg(info->to_filter_folder, info);
 271                         info->is_copy = FALSE;
 272                 }
 273                 /* mark message to be moved */
 274                 info->is_move = TRUE;
 275                 info->to_filter_folder = dest_folder;
 276                 return TRUE;
 277
 278         case MATCHACTION_COPY:
 279                 dest_folder =
 280                         folder_find_item_from_identifier(action->destination);
 281
 282                 if (!dest_folder) {
 283                         debug_print("*** folder not found '%s'\n",
 284                                 action->destination ?action->destination :"");
 285                         return FALSE;
 286                 }
 287
 288                 /* check if mail is set to copy already,
 289                  * in which case we have to do it */
 290                 if (info->is_copy && info->to_filter_folder) {
 291                         debug_print("should cp and mv !\n");
 292                         folder_item_copy_msg(info->to_filter_folder, info);
 293                         info->is_copy = FALSE;
 294                 }
 295                 /* mark message to be copied */
 296                 info->is_copy = TRUE;
 297                 info->to_filter_folder = dest_folder;
 298                 return TRUE;
 299
 300         case MATCHACTION_DELETE:
 301                 if (folder_item_remove_msg(info->folder, info->msgnum) == -1)
 302                         return FALSE;
 303                 return TRUE;
 304
 305         case MATCHACTION_MARK:
 306                 procmsg_msginfo_set_flags(info, MSG_MARKED, 0);
 307                 return TRUE;
 308
 309         case MATCHACTION_UNMARK:
 310                 procmsg_msginfo_unset_flags(info, MSG_MARKED, 0);
 311                 return TRUE;
 312
 313         case MATCHACTION_LOCK:
 314                 procmsg_msginfo_set_flags(info, MSG_LOCKED, 0);
 315                 return TRUE;
 316
 317         case MATCHACTION_UNLOCK:
 318                 procmsg_msginfo_unset_flags(info, MSG_LOCKED, 0);
 319                 return TRUE;
 320
 321         case MATCHACTION_MARK_AS_READ:
 322                 procmsg_msginfo_unset_flags(info, MSG_UNREAD | MSG_NEW, 0);
 323                 return TRUE;
 324
 325         case MATCHACTION_MARK_AS_UNREAD:
 326                 procmsg_msginfo_set_flags(info, MSG_UNREAD | MSG_NEW, 0);
 327                 return TRUE;
 328
 329         case MATCHACTION_MARK_AS_SPAM:
 330                 procmsg_spam_learner_learn(info, NULL, TRUE);
 331                 procmsg_msginfo_change_flags(info, MSG_SPAM, 0, MSG_NEW|MSG_UNREAD, 0);
 332                 if (procmsg_spam_get_folder(info)) {
 333                         info->is_move = TRUE;
 334                         info->to_filter_folder = procmsg_spam_get_folder(info);
 335                 }
 336                 return TRUE;
 337
 338         case MATCHACTION_MARK_AS_HAM:
 339                 procmsg_spam_learner_learn(info, NULL, FALSE);
 340                 return TRUE;
 341
 342         case MATCHACTION_COLOR:
 343                 procmsg_msginfo_unset_flags(info, MSG_CLABEL_FLAG_MASK, 0);
 344                 procmsg_msginfo_set_flags(info, MSG_COLORLABEL_TO_FLAGS(action->labelcolor), 0);
 345                 return TRUE;
 346
 347         case MATCHACTION_FORWARD:
 348         case MATCHACTION_FORWARD_AS_ATTACHMENT:
 349                 account = account_find_from_id(action->account_id);
 350                 compose = compose_forward(account, info,
 351                         action->type == MATCHACTION_FORWARD ? FALSE : TRUE,
 352                         NULL, TRUE, TRUE);
 353                 compose_entry_append(compose, action->destination,
 354                                      compose->account->protocol == A_NNTP
 355                                             ? COMPOSE_NEWSGROUPS
 356                                             : COMPOSE_TO);
 357
 358                 val = compose_send(compose);
 359
 360                 return val == 0 ? TRUE : FALSE;
 361
 362         case MATCHACTION_REDIRECT:
 363                 account = account_find_from_id(action->account_id);
 364                 compose = compose_redirect(account, info, TRUE);
 365                 if (compose->account->protocol == A_NNTP)
 366                         break;
 367                 else
 368                         compose_entry_append(compose, action->destination,
 369                                              COMPOSE_TO);
 370
 371                 val = compose_send(compose);
 372
 373                 return val == 0 ? TRUE : FALSE;
 374
 375         case MATCHACTION_EXECUTE:
 376                 cmd = matching_build_command(action->destination, info);
 377                 if (cmd == NULL)
 378                         return FALSE;
 379                 else {
 380                         system(cmd);
 381                         g_free(cmd);
 382                 }
 383                 return TRUE;
 384
 385         case MATCHACTION_SET_SCORE:
 386                 info->score = action->score;
 387                 return TRUE;
 388
 389         case MATCHACTION_CHANGE_SCORE:
 390                 info->score += action->score;
 391                 return TRUE;
 392
 393         case MATCHACTION_STOP:
 394                 return FALSE;
 395
 396         case MATCHACTION_HIDE:
 397                 info->hidden = TRUE;
 398                 return TRUE;
 399
 400         case MATCHACTION_IGNORE:
 401                 procmsg_msginfo_set_flags(info, MSG_IGNORE_THREAD, 0);
 402                 return TRUE;
 403
 404         default:
 405                 break;
 406         }
 407         return FALSE;
 408 }
 409
 410 gboolean filteringaction_apply_action_list(GSList *action_list, MsgInfo *info)
 411 {
 412         GSList *p;
 413         g_return_val_if_fail(action_list, FALSE);
 414         g_return_val_if_fail(info, FALSE);
 415         for (p = action_list; p && p->data; p = g_slist_next(p)) {
 416                 FilteringAction *a = (FilteringAction *) p->data;
 417                 if (filteringaction_apply(a, info)) {
 418                         if (filtering_is_final_action(a))
 419                                 break;
 420                 } else
 421                         return FALSE;
 422
 423         }
 424         return TRUE;
 425 }
 426
 427 static gboolean filtering_match_condition(FilteringProp *filtering, MsgInfo *info,
 428                                                         PrefsAccount *ac_prefs)
 429 {
 430         gboolean matches = FALSE;
 431
 432         if (ac_prefs != NULL) {
 433                 matches = ((filtering->account_id == 0)
 434                                         || (filtering->account_id == ac_prefs->account_id));
 435         } else {
 436                 switch (prefs_common.apply_per_account_filtering_rules) {
 437                 case FILTERING_ACCOUNT_RULES_FORCE:
 438                         /* apply filtering rules regardless to the account info */
 439                         matches = TRUE;
 440                         break;
 441                 case FILTERING_ACCOUNT_RULES_SKIP:
 442                         /* don't apply filtering rules that belong to an account */
 443                         matches = (filtering->account_id == 0);
 444                         break;
 445                 case FILTERING_ACCOUNT_RULES_USE_CURRENT:
 446                         matches = ((filtering->account_id == 0)
 447                                         || (filtering->account_id == cur_account->account_id));
 448                         break;
 449                 }
 450         }
 451
 452         return matches && matcherlist_match(filtering->matchers, info);
 453 }
 454
 455 /*!
 456  *\brief        Apply a rule on message.
 457  *
 458  *\param        filtering List of filtering rules.
 459  *\param        info Message to apply rules on.
 460  *\param        final Variable returning TRUE or FALSE if one of the
 461  *              encountered actions was final.
 462  *              See also \ref filtering_is_final_action.
 463  *
 464  *\return       gboolean TRUE to continue applying rules.
 465  */
 466 static gboolean filtering_apply_rule(FilteringProp *filtering, MsgInfo *info,
 467     gboolean * final)
 468 {
 469         gboolean result = TRUE;
 470         gchar    buf[256];
 471         GSList * tmp;
 472
 473         * final = FALSE;
 474         for (tmp = filtering->action_list ; tmp != NULL ; tmp = tmp->next) {
 475                 FilteringAction * action;
 476
 477                 action = tmp->data;
 478
 479                 if (FALSE == (result = filteringaction_apply(action, info))) {
 480                         g_warning("No further processing after rule %s\n",
 481                             filteringaction_to_string(buf, sizeof buf, action));
 482                 }
 483
 484                 if (filtering_is_final_action(action)) {
 485                         * final = TRUE;
 486                         break;
 487                 }
 488         }
 489         return result;
 490 }
 491
 492 /*!
 493  *\brief        Check if an action is "final", i.e. should break further
 494  *              processing.
 495  *
 496  *\param        filtering_action Action to check.
 497  *
 498  *\return       gboolean TRUE if \a filtering_action is final.
 499  */
 500 static gboolean filtering_is_final_action(FilteringAction *filtering_action)
 501 {
 502         switch(filtering_action->type) {
 503         case MATCHACTION_MOVE:
 504         case MATCHACTION_DELETE:
 505         case MATCHACTION_STOP:
 506         case MATCHACTION_MARK_AS_SPAM:
 507                 return TRUE; /* MsgInfo invalid for message */
 508         default:
 509                 return FALSE;
 510         }
 511 }
 512
 513 static gboolean filter_msginfo(GSList * filtering_list, MsgInfo * info, PrefsAccount* ac_prefs)
 514 {
 515         GSList  *l;
 516         gboolean final;
 517         gboolean apply_next;
 518
 519         g_return_val_if_fail(info != NULL, TRUE);
 520
 521         for (l = filtering_list, final = FALSE, apply_next = FALSE; l != NULL; l = g_slist_next(l)) {
 522                 FilteringProp * filtering = (FilteringProp *) l->data;
 523
 524                 if (filtering->enabled && filtering_match_condition(filtering, info, ac_prefs)) {
 525                         apply_next = filtering_apply_rule(filtering, info, &final);
 526                         if (final)
 527                                 break;
 528                 }
 529         }
 530
 531         /* put in inbox if a final rule could not be applied, or
 532          * the last rule was not a final one. */
 533         if ((final && !apply_next) || !final) {
 534                 return FALSE;
 535         }
 536
 537         return TRUE;
 538 }
 539
 540 /*!
 541  *\brief        Filter a message against a list of rules.
 542  *
 543  *\param        flist List of filter rules.
 544  *\param        info Message.
 545  *
 546  *\return       gboolean TRUE if filter rules handled the message.
 547  *
 548  *\note         Returning FALSE means the message was not handled,
 549  *              and that the calling code should do the default
 550  *              processing. E.g. \ref inc.c::inc_start moves the
 551  *              message to the inbox.
 552  */
 553 gboolean filter_message_by_msginfo(GSList *flist, MsgInfo *info, PrefsAccount* ac_prefs)
 554 {
 555         return filter_msginfo(flist, info, ac_prefs);
 556 }
 557
 558 gchar *filteringaction_to_string(gchar *dest, gint destlen, FilteringAction *action)
 559 {
 560         const gchar *command_str;
 561         gchar * quoted_dest;
 562
 563         command_str = get_matchparser_tab_str(action->type);
 564
 565         if (command_str == NULL)
 566                 return NULL;
 567
 568         switch(action->type) {
 569         case MATCHACTION_MOVE:
 570         case MATCHACTION_COPY:
 571         case MATCHACTION_EXECUTE:
 572                 quoted_dest = matcher_quote_str(action->destination);
 573                 g_snprintf(dest, destlen, "%s \"%s\"", command_str, quoted_dest);
 574                 g_free(quoted_dest);
 575                 return dest;
 576
 577         case MATCHACTION_DELETE:
 578         case MATCHACTION_MARK:
 579         case MATCHACTION_UNMARK:
 580         case MATCHACTION_LOCK:
 581         case MATCHACTION_UNLOCK:
 582         case MATCHACTION_MARK_AS_READ:
 583         case MATCHACTION_MARK_AS_UNREAD:
 584         case MATCHACTION_MARK_AS_SPAM:
 585         case MATCHACTION_MARK_AS_HAM:
 586         case MATCHACTION_STOP:
 587         case MATCHACTION_HIDE:
 588         case MATCHACTION_IGNORE:
 589                 g_snprintf(dest, destlen, "%s", command_str);
 590                 return dest;
 591
 592         case MATCHACTION_REDIRECT:
 593         case MATCHACTION_FORWARD:
 594         case MATCHACTION_FORWARD_AS_ATTACHMENT:
 595                 quoted_dest = matcher_quote_str(action->destination);
 596                 g_snprintf(dest, destlen, "%s %d \"%s\"", command_str, action->account_id, quoted_dest);
 597                 g_free(quoted_dest);
 598                 return dest;
 599
 600         case MATCHACTION_COLOR:
 601                 g_snprintf(dest, destlen, "%s %d", command_str, action->labelcolor);
 602                 return dest;
 603
 604         case MATCHACTION_CHANGE_SCORE:
 605         case MATCHACTION_SET_SCORE:
 606                 g_snprintf(dest, destlen, "%s %d", command_str, action->score);
 607                 return dest;
 608
 609         default:
 610                 return NULL;
 611         }
 612 }
 613
 614 gchar * filteringaction_list_to_string(GSList * action_list)
 615 {
 616         gchar *action_list_str;
 617         gchar  buf[256];
 618         GSList * tmp;
 619         gchar *list_str;
 620
 621         action_list_str = NULL;
 622         for (tmp = action_list ; tmp != NULL ; tmp = tmp->next) {
 623                 gchar *action_str;
 624                 FilteringAction * action;
 625
 626                 action = tmp->data;
 627
 628                 action_str = filteringaction_to_string(buf,
 629                     sizeof buf, action);
 630
 631                 if (action_list_str != NULL) {
 632                         list_str = g_strconcat(action_list_str, " ", action_str, NULL);
 633                         g_free(action_list_str);
 634                 }
 635                 else {
 636                         list_str = g_strdup(action_str);
 637                 }
 638                 action_list_str = list_str;
 639         }
 640
 641         return action_list_str;
 642 }
 643
 644 gchar * filteringprop_to_string(FilteringProp * prop)
 645 {
 646         gchar *list_str;
 647         gchar *action_list_str;
 648         gchar *filtering_str;
 649
 650         action_list_str = filteringaction_list_to_string(prop->action_list);
 651
 652         if (action_list_str == NULL)
 653                 return NULL;
 654
 655         list_str = matcherlist_to_string(prop->matchers);
 656
 657         if (list_str == NULL) {
 658                 g_free(action_list_str);
 659                 return NULL;
 660         }
 661
 662         filtering_str = g_strconcat(list_str, " ", action_list_str, NULL);
 663         g_free(action_list_str);
 664         g_free(list_str);
 665
 666         return filtering_str;
 667 }
 668
 669 void prefs_filtering_free(GSList * prefs_filtering)
 670 {
 671         while (prefs_filtering != NULL) {
 672                 FilteringProp * filtering = (FilteringProp *)
 673                         prefs_filtering->data;
 674                 filteringprop_free(filtering);
 675                 prefs_filtering = g_slist_remove(prefs_filtering, filtering);
 676         }
 677 }
 678
 679 static gboolean prefs_filtering_free_func(GNode *node, gpointer data)
 680 {
 681         FolderItem *item = node->data;
 682
 683         g_return_val_if_fail(item, FALSE);
 684         g_return_val_if_fail(item->prefs, FALSE);
 685
 686         prefs_filtering_free(item->prefs->processing);
 687         item->prefs->processing = NULL;
 688
 689         return FALSE;
 690 }
 691
 692 void prefs_filtering_clear(void)
 693 {
 694         GList * cur;
 695
 696         for (cur = folder_get_list() ; cur != NULL ; cur = g_list_next(cur)) {
 697                 Folder *folder;
 698
 699                 folder = (Folder *) cur->data;
 700                 g_node_traverse(folder->node, G_PRE_ORDER, G_TRAVERSE_ALL, -1,
 701                                 prefs_filtering_free_func, NULL);
 702         }
 703
 704         prefs_filtering_free(filtering_rules);
 705         filtering_rules = NULL;
 706         prefs_filtering_free(pre_global_processing);
 707         pre_global_processing = NULL;
 708         prefs_filtering_free(post_global_processing);
 709         post_global_processing = NULL;
 710 }
 711
 712 void prefs_filtering_clear_folder(Folder *folder)
 713 {
 714         g_return_if_fail(folder);
 715         g_return_if_fail(folder->node);
 716
 717         g_node_traverse(folder->node, G_PRE_ORDER, G_TRAVERSE_ALL, -1,
 718                         prefs_filtering_free_func, NULL);
 719         /* FIXME: Note folder settings were changed, where the updates? */
 720 }
 721
 722 gboolean filtering_peek_per_account_rules(GSList *filtering_list)
 723 /* return TRUE if there's at least one per-account filtering rule */
 724 {
 725         GSList *l;
 726
 727         for (l = filtering_list; l != NULL; l = g_slist_next(l)) {
 728                 FilteringProp * filtering = (FilteringProp *) l->data;
 729
 730                 if (filtering->enabled && (filtering->account_id != 0)) {
 731                         return TRUE;
 732                 }
 733         }
 734
 735         return FALSE;
 736 }