aboutsummaryrefslogtreecommitdiffstats
path: root/mail/message-thread.c
blob: f199c27341d36de4914a2a0f26660c9775b30a2a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Copyright (C) 2000 Helix Code Inc.
 *
 *  Authors: Michael Zucchi <notzed@helixcode.com>
 *
 *  This program is free software; you can redistribute it and/or 
 *  modify it under the terms of the GNU General Public License as 
 *  published by the Free Software Foundation; either version 2 of the
 *  License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA
 */

#include "camel/camel.h"
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <glib.h>
#include <ctype.h>

#include "message-thread.h"

#define d(x)

int dump_tree(struct _container *c, int depth);

static void
container_add_child(struct _container *node, struct _container *child)
{
    d(printf("\nAdding child %p to parent %p \n", child, node));
    child->next = node->child;
    node->child = child;
    child->parent = node;
}

#if 0
static void
container_unparent_child(struct _container *child)
{
    struct _container *c, *node;

    /* are we unparented? */
    if (child->parent == NULL) {
        return;
    }

    /* else remove child from its existing parent, and reparent */
    node = child->parent;
    c = (struct _container *)&node->child;
    d(printf("scanning children:\n"));
    while (c->next) {
        d(printf(" %p\n", c));
            if (c->next==child) {
            d(printf("found node %p\n", child));
            c->next = c->next->next;
            child->parent = NULL;
            return;
        }
        c = c->next;
    }

    printf("DAMN, we shouldn't  be here!\n");
}
#endif

static void
container_parent_child(struct _container *parent, struct _container *child)
{
    struct _container *c, *node;

    /* are we already the right parent? */
    if (child->parent == parent)
        return;

    /* are we unparented? */
    if (child->parent == NULL) {
        container_add_child(parent, child);
        return;
    }

    /* else remove child from its existing parent, and reparent */
    node = child->parent;
    c = (struct _container *)&node->child;
    d(printf("scanning children:\n"));
    while (c->next) {
        d(printf(" %p\n", c));
            if (c->next==child) {
            d(printf("found node %p\n", child));
            c->next = c->next->next;
            child->parent = NULL;
            container_add_child(parent, child);
            return;
        }
        c = c->next;
    }

    printf("DAMN, we shouldn't  be here!\n");
}

static void
prune_empty(struct _container **cp)
{
    struct _container *child, *next, *c, *lastc;

    /* yes, this is intentional */
    lastc = (struct _container *)cp;
    while (lastc->next) {
        c = lastc->next;

        d(printf("checking message %p %p (%s)\n", c,
             c->message, c->message?c->message->message_id:"<empty>"));
        if (c->message == NULL) {
            if (c->child == NULL) {
                d(printf("removing empty node\n"));
                lastc->next = c->next;
                continue;
            }
            if (c->parent || c->child->next==0) {
                d(printf("promoting child\n"));
                lastc->next = c->next; /* remove us */
                child = c->child;
                while (child) {
                    next = child->next;

                    child->parent = c->parent;
                    child->next = lastc->next;
                    lastc->next = child;

                    child = next;
                }
                continue;
            }
        }
        prune_empty(&c->child);
        lastc = c;
    }
}

static void
hashloop(void *key, void *value, void *data)
{
    struct _container *c = value;
    struct _container *tail = data;

    if (c->parent == NULL) {
        c->next = tail->next;
        tail->next = c;
    }
}

static char *
get_root_subject(struct _container *c, int *re)
{
    char *s, *p;
    struct _container *scan;
    
    s = NULL;
    *re = FALSE;
    if (c->message)
        s = c->message->subject;
    else {
        /* one of the children will always have a message */
        scan = c->child;
        while (scan) {
            if (scan->message) {
                s = scan->message->subject;
                break;
            }
            scan = scan->next;
        }
    }
    if (s != NULL) {
        while (*s) {
            while (isspace(*s))
                s++;
            if (s[0] == 0)
                break;
            if ((s[0] == 'r' || s[0]=='R')
                && (s[1] == 'e' || s[1]=='E')) {
                p = s+2;
                while (isdigit(*p) || (ispunct(*p) && (*p != ':')))
                    p++;
                if (*p==':') {
                    *re = TRUE;
                    s = p+1;
                } else
                    break;
            } else
                break;
        }
        if (*s)
            return s;
    }
    return NULL;
}

/* this is pretty slow, but not used often */
static void
remove_node(struct _container **list, struct _container *node, struct _container **clast)
{
    struct _container *c;

    /* this is intentional, even if it looks funny */
    c = (struct _container *)list;
    while (c->next) {
        if (c->next == node) {
            if (clast && *clast == c->next)
                *clast = c;
            c->next = c->next->next;
            break;
        }
        c = c->next;
    }
}

static void
group_root_set(struct _container **cp)
{
    GHashTable *subject_table = g_hash_table_new(g_str_hash, g_str_equal);
    struct _container *c, *clast, *scan, *container;

    /* gather subject lines */ 
    d(printf("gathering subject lines\n"));
    clast = (struct _container *)cp;
    c = clast->next;
    while (c) {
        c->root_subject = get_root_subject(c, &c->re);
        if (c->root_subject) {
            container = g_hash_table_lookup(subject_table, c->root_subject);
            if (container == NULL
                || (container->message == NULL && c->message)
                || (container->re == TRUE && !c->re)) {
                g_hash_table_insert(subject_table, c->root_subject, c);
            }
        }
        c = c->next;
    }

    /* merge common subjects? */
    clast = (struct _container *)cp;
    while (clast->next) {
        c = clast->next;
        d(printf("checking %p %s\n", c, c->root_subject));
        if (c->root_subject
            && (container = g_hash_table_lookup(subject_table, c->root_subject))
            && (container != c)) {
            d(printf(" matching %p %s\n", container, container->root_subject));
            if (c->message == NULL && container->message == NULL) {
                d(printf("merge containers children\n"));
                /* steal the children from c onto container, and unlink c */
                scan = (struct _container *)&container->child;
                while (scan->next)
                    scan = scan->next;
                scan->next = c->child;
                clast->next = c->next;
                continue;
            } if (c->message == NULL && container->message != NULL) {
                d(printf("container is non-empty parent\n"));
                remove_node(cp, container, &clast);
                container_add_child(c, container);
            } else if (c->message != NULL && container->message == NULL) {
                d(printf("container is empty child\n"));
                clast->next = c->next;
                container_add_child(container, c);
                continue;
            } else if (c->re && !container->re) {
                d(printf("container is re\n"));
                clast->next = c->next;
                container_add_child(container, c);
                continue;
            } else if (!c->re && container->re) {
                d(printf("container is not re\n"));
                remove_node(cp, container, &clast);
                container_add_child(c, container);
            } else if (c->re && container->re) {
                d(printf("subjects are common %p and %p\n", c, container));

                remove_node(cp, container, &clast);
                remove_node(cp, c, &clast);

                scan = g_malloc0(sizeof(*scan));
                scan->root_subject = c->root_subject;
                scan->re = c->re && container->re;
                scan->next = c->next;
                clast->next = scan;
                container_add_child(scan, c);
                container_add_child(scan, container);
                clast = scan;
                g_hash_table_insert(subject_table, scan->root_subject, scan);
                continue;
            }
        }
        clast = c;
    }
    g_hash_table_destroy(subject_table);
}

int
dump_tree(struct _container *c, int depth)
{
    char *p;
    int count=0;

    p = alloca(depth*2+1);
    memset(p, ' ', depth*2);
    p[depth*2] = 0;

    while (c) {
        if (c->message) {
            printf("%s %p Subject: %s <%s>\n", p, c, c->message->subject, c->message->message_id);
            count += 1;
        } else {
            printf("%s %p <empty>\n", p, c);
        }
        if (c->child)
            count += dump_tree(c->child, depth+1);
        c = c->next;
    }
    return count;
}

void thread_messages_free(struct _container *c)
{
    struct _container *n;

    return;

    /* FIXME: ok, for some reason this doesn't work .. investigate later ... */

    while (c) {
        n = c->next;
        if (c->child)
            thread_messages_free(c->child); /* free's children first */
        g_free(c);
        c = n;
    }
}

static int
sort_node(const void *a, const void *b)
{
    const struct _container *a1 = ((struct _container **)a)[0];
    const struct _container *b1 = ((struct _container **)b)[0];

    /* if we have no message, it must be a dummy node, which 
       also means it must have a child, just use that as the
       sort data (close enough?) */
    if (a1->message == NULL)
        a1 = a1->child;
    if (b1->message == NULL)
        b1 = b1->child;
    if (a1->order == b1->order)
        return 0;
    if (a1->order < b1->order)
        return 1;
    else
        return -1;
}

static void
sort_thread(struct _container **cp)
{
    struct _container *c, *head, **carray;
    int size=0;

    c = *cp;
    while (c) {
        /* sort the children while we're at it */
        if (c->child)
            sort_thread(&c->child);
        size++;
        c = c->next;
    }
    if (size<2)
        return;
    carray = alloca(size*sizeof(struct _container *));
    c = *cp;
    size=0;
    while (c) {
        carray[size] = c;
        c = c->next;
        size++;
    }
    qsort(carray, size, sizeof(struct _container *), sort_node);
    size--;
    head = carray[size];
    head->next = NULL;
    size--;
    do {
        c = carray[size];
        c->next = head;
        head = c;
        size--;
    } while (size>=0);
    *cp = head;
}

struct _container *
thread_messages(CamelFolder *folder, GPtrArray *uids)
{
    GHashTable *id_table, *no_id_table;
    int i;
    struct _container *c, *p, *child, *head, *container;
    struct _header_references *ref;

    id_table = g_hash_table_new(g_str_hash, g_str_equal);
    no_id_table = g_hash_table_new(NULL, NULL);
    for (i=0;i<uids->len;i++) {
        const CamelMessageInfo *mi;
        mi = camel_folder_get_message_info (folder, uids->pdata[i]);

        if (mi == NULL) {
            g_warning("Folder doesn't contain uid %s", (char *)uids->pdata[i]);
            continue;
        }

        if (mi->message_id) {
            d(printf("doing : %s\n", mi->message_id));
            c = g_hash_table_lookup(id_table, mi->message_id);
            if (!c) {
                c = g_malloc0(sizeof(*c));
                g_hash_table_insert(id_table, mi->message_id, c);
            }
        } else {
            d(printf("doing : (no message id)\n"));
            c = g_malloc0(sizeof(*c));
            g_hash_table_insert(no_id_table, (void *)mi, c);
        }

        c->message = mi;
        c->order = i;
        container = c;
        ref = mi->references;
        p = NULL;
        child = container;
        head = NULL;
        d(printf("references:\n"));
        while (ref) {
            if (ref->id == NULL) {
                printf("ref missing id!?\n");
                ref = ref->next;
                continue;
            }

            d(printf("looking up reference: %s\n", ref->id));
            c = g_hash_table_lookup(id_table, ref->id);
            if (c == NULL) {
                d(printf("not found\n"));
                c = g_malloc0(sizeof(*c));
                g_hash_table_insert(id_table, ref->id, c);
            }
            if (c!=child)
                container_parent_child(c, child);
            child = c;
            if (head == NULL)
                head = c;
            ref = ref->next;
        }
    }

    d(printf("\n\n"));
    /* build a list of root messages (no parent) */
    head = NULL;
    g_hash_table_foreach(id_table, hashloop, &head);
    g_hash_table_foreach(no_id_table, hashloop, &head);

    g_hash_table_destroy(id_table);
    g_hash_table_destroy(no_id_table);

    /* remove empty parent nodes */
    prune_empty(&head);

    /* find any siblings which missed out */
    group_root_set(&head);

#if 0
    printf("finished\n");
    i = dump_tree(head, 0);
    printf("%d count, %d items in tree\n", uids->len, i);
#endif

    sort_thread(&head);
    return head;
}

#ifdef STANDALONE

static char *
auth_callback(char *prompt, gboolean secret,
          CamelService *service, char *item,
          CamelException *ex)
{
    printf ("auth_callback called: %s\n", prompt);
    return NULL;
}

int
main (int argc, char**argv)
{
    CamelSession *session;
    CamelException *ex;
    CamelStore *store;
    gchar *store_url = "mbox:///home/notzed/evolution/local/Inbox";
    CamelFolder *folder;
    CamelMimeMessage *message;
    GList *uid_list;
    GPtrArray *summary;

    gtk_init (&argc, &argv);
    camel_init ();      
    ex = camel_exception_new ();
    
    session = camel_session_new (auth_callback);
    store = camel_session_get_store (session, store_url, ex);
    if (camel_exception_get_id (ex)) {
        printf ("Exception caught in camel_session_get_store\n"
            "Full description : %s\n", camel_exception_get_description (ex));
        return -1;
    }

    folder = camel_store_get_folder (store, "mbox", TRUE, ex);
    if (camel_exception_get_id (ex)) {
        printf ("Exception caught in camel_store_get_folder\n"
            "Full description : %s\n", camel_exception_get_description (ex));
        return -1;
    }

#if 0
    camel_folder_open (folder, FOLDER_OPEN_RW, ex);
    if (camel_exception_get_id (ex)) {
        printf ("Exception caught when trying to open the folder\n"
            "Full description : %s\n", camel_exception_get_description (ex));
        return -1;
    }
#endif

    summary = camel_folder_get_summary(folder, ex);
    thread_messages((CamelMessageInfo **)summary->pdata, summary->len);

    return 0;
}

#endif

/*

  msgid: d
  references: a b c

  msgid: f
  references: c d

  msgid: e
  references: c

  a
   \
    b
     \
      c
       \
        d
        |\
        e f
 */
/*
  lookup d
    create new node d
  child = d
  loop on c b a
    lookup node?
    if no node, create node
    add child to node
    child = node
  endloop

 */