diplodocus.org Git - nmh/blob - uip/new.c

   1
   2 /*
   3  * new.c -- as new,    list all folders with unseen messages
   4  *       -- as fnext,  move to next folder with unseen messages
   5  *       -- as fprev,  move to previous folder with unseen messages
   6  *       -- as unseen, scan all unseen messages
   7  * This code is Copyright (c) 2008, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  *
  11  * Inspired by Luke Mewburn's new: http://www.mewburn.net/luke/src/new
  12  */
  13
  14 #include <sys/types.h>
  15
  16 #include <h/mh.h>
  17 #include <h/crawl_folders.h>
  18 #include <h/utils.h>
  19
  20 #define NEW_SWITCHES \
  21     X("mode", 1, MODESW) \
  22     X("folders", 1, FOLDERSSW) \
  23     X("version", 1, VERSIONSW) \
  24     X("help", 1, HELPSW) \
  25
  26 #define X(sw, minchars, id) id,
  27 DEFINE_SWITCH_ENUM(NEW);
  28 #undef X
  29
  30 #define X(sw, minchars, id) { sw, minchars, id },
  31 DEFINE_SWITCH_ARRAY(NEW, switches);
  32 #undef X
  33
  34 static enum { NEW, FNEXT, FPREV, UNSEEN } run_mode = NEW;
  35
  36 /* check_folders uses this to maintain state with both .folders list of
  37  * folders and with crawl_folders. */
  38 struct list_state {
  39     struct node **first, **cur_node;
  40     size_t *maxlen;
  41     char *cur;
  42     char **sequences;
  43     struct node *node;
  44 };
  45
  46 /* Return the number of messages in a string list of message numbers. */
  47 static int
  48 count_messages(char *field)
  49 {
  50     int total = 0;
  51     int j, k;
  52     char *cp, **ap;
  53
  54     field = getcpy(field);
  55
  56     /* copied from seq_read.c:seq_init */
  57     for (ap = brkstring (field, " ", "\n"); *ap; ap++) {
  58         if ((cp = strchr(*ap, '-')))
  59             *cp++ = '\0';
  60         if ((j = m_atoi (*ap)) > 0) {
  61             k = cp ? m_atoi (cp) : j;
  62
  63             total += k - j + 1;
  64         }
  65     }
  66
  67     free(field);
  68
  69     return total;
  70 }
  71
  72 /* Return TRUE if the sequence 'name' is in 'sequences'. */
  73 static boolean
  74 seq_in_list(char *name, char *sequences[])
  75 {
  76     int i;
  77
  78     for (i = 0; sequences[i] != NULL; i++) {
  79         if (strcmp(name, sequences[i]) == 0) {
  80             return TRUE;
  81         }
  82     }
  83
  84     return FALSE;
  85 }
  86
  87 /* Return the string list of message numbers from the sequences file, or NULL
  88  * if none. */
  89 static char *
  90 get_msgnums(char *folder, char *sequences[])
  91 {
  92     char *seqfile = NULL;
  93     FILE *fp;
  94     int state;
  95     char name[NAMESZ], field[BUFSIZ];
  96     char *cp;
  97     char *msgnums = NULL, *this_msgnums, *old_msgnums;
  98     int failed_to_lock = 0;
  99     m_getfld_state_t gstate = 0;
 100
 101     /* copied from seq_read.c:seq_public */
 102     /*
 103      * If mh_seq == NULL or if *mh_seq == '\0' (the user has defined
 104      * the "mh-sequences" profile entry, but left it empty),
 105      * then just return, and do not initialize any public sequences.
 106      */
 107     if (mh_seq == NULL || *mh_seq == '\0')
 108         return NULL;
 109
 110     /* get filename of sequence file */
 111     seqfile = concat(m_maildir(folder), "/", mh_seq, (void *)NULL);
 112
 113     if (seqfile == NULL)
 114         return NULL;
 115
 116     if ((fp = lkfopendata (seqfile, "r", & failed_to_lock)) == NULL) {
 117
 118         if (failed_to_lock) {
 119             adios (seqfile, "failed to lock");
 120         } else {
 121             free(seqfile);
 122             return NULL;
 123         }
 124     }
 125
 126     /* Use m_getfld to scan sequence file */
 127     for (;;) {
 128         int fieldsz = sizeof field;
 129         switch (state = m_getfld (&gstate, name, field, &fieldsz, fp)) {
 130             case FLD:
 131             case FLDPLUS:
 132                 if (state == FLDPLUS) {
 133                     cp = getcpy (field);
 134                     while (state == FLDPLUS) {
 135                         fieldsz = sizeof field;
 136                         state = m_getfld (&gstate, name, field, &fieldsz, fp);
 137                         cp = add (field, cp);
 138                     }
 139
 140                     /* Here's where we differ from seq_public: if it's in a
 141                      * sequence we want, save the list of messages. */
 142                     if (seq_in_list(name, sequences)) {
 143                         this_msgnums = trimcpy(cp);
 144                         if (msgnums == NULL) {
 145                             msgnums = this_msgnums;
 146                         } else {
 147                             old_msgnums = msgnums;
 148                             msgnums = concat(old_msgnums, " ",
 149                                              this_msgnums, (void *)NULL);
 150                             free(old_msgnums);
 151                             free(this_msgnums);
 152                         }
 153                     }
 154                     free (cp);
 155                 } else {
 156                     /* and here */
 157                     if (seq_in_list(name, sequences)) {
 158                         this_msgnums = trimcpy(field);
 159                         if (msgnums == NULL) {
 160                             msgnums = this_msgnums;
 161                         } else {
 162                             old_msgnums = msgnums;
 163                             msgnums = concat(old_msgnums, " ",
 164                                              this_msgnums, (void *)NULL);
 165                             free(old_msgnums);
 166                             free(this_msgnums);
 167                         }
 168                     }
 169                 }
 170
 171                 continue;
 172
 173             case BODY:
 174                 adios (NULL, "no blank lines are permitted in %s", seqfile);
 175                 /* fall */
 176
 177             case FILEEOF:
 178                 break;
 179
 180             default:
 181                 adios (NULL, "%s is poorly formatted", seqfile);
 182         }
 183         break;  /* break from for loop */
 184     }
 185     m_getfld_state_destroy (&gstate);
 186
 187     lkfclosedata (fp, seqfile);
 188
 189     free(seqfile);
 190
 191     return msgnums;
 192 }
 193
 194 /* Check `folder' (of length `len') for interesting messages, filling in the
 195  * list in `b'. */
 196 static void
 197 check_folder(char *folder, size_t len, struct list_state *b)
 198 {
 199     char *msgnums = get_msgnums(folder, b->sequences);
 200     int is_cur = strcmp(folder, b->cur) == 0;
 201
 202     if (is_cur || msgnums != NULL) {
 203         if (*b->first == NULL) {
 204             *b->first = b->node = mh_xmalloc(sizeof(*b->node));
 205         } else {
 206             b->node->n_next = mh_xmalloc(sizeof(*b->node));
 207             b->node = b->node->n_next;
 208         }
 209         b->node->n_name = folder;
 210         b->node->n_field = msgnums;
 211
 212         if (*b->maxlen < len) {
 213             *b->maxlen = len;
 214         }
 215     }
 216
 217     /* Save the node for the current folder, so we can fall back to it. */
 218     if (is_cur) {
 219         *b->cur_node = b->node;
 220     }
 221 }
 222
 223 static boolean
 224 crawl_callback(char *folder, void *baton)
 225 {
 226     check_folder(folder, strlen(folder), baton);
 227     return TRUE;
 228 }
 229
 230 /* Scan folders, returning:
 231  * first        -- list of nodes for all folders which have desired messages;
 232  *                 if the current folder is listed in .folders, it is also in
 233  *                 the list regardless of whether it has any desired messages
 234  * last         -- last node in list
 235  * cur_node     -- node of current folder, if listed in .folders
 236  * maxlen       -- length of longest folder name
 237  *
 238  * `cur' points to the name of the current folder, `folders' points to the
 239  * name of a .folder (if NULL, crawl all folders), and `sequences' points to
 240  * the array of sequences for which to look.
 241  *
 242  * An empty list is returned as first=last=NULL.
 243  */
 244 static void
 245 check_folders(struct node **first, struct node **last,
 246               struct node **cur_node, size_t *maxlen,
 247               char *cur, char *folders, char *sequences[])
 248 {
 249     struct list_state b;
 250     FILE *fp;
 251     char *line;
 252     size_t len;
 253
 254     *first = *last = *cur_node = NULL;
 255     *maxlen = 0;
 256
 257     b.first = first;
 258     b.cur_node = cur_node;
 259     b.maxlen = maxlen;
 260     b.cur = cur;
 261     b.sequences = sequences;
 262
 263     if (folders == NULL) {
 264         chdir(m_maildir(""));
 265         crawl_folders(".", crawl_callback, &b);
 266     } else {
 267         fp = fopen(folders, "r");
 268         if (fp  == NULL) {
 269             adios(NULL, "failed to read %s", folders);
 270         }
 271         while (vfgets(fp, &line) == OK) {
 272             len = strlen(line) - 1;
 273             line[len] = '\0';
 274             check_folder(getcpy(line), len, &b);
 275         }
 276         fclose(fp);
 277     }
 278
 279     if (*first != NULL) {
 280         b.node->n_next = NULL;
 281         *last = b.node;
 282     }
 283 }
 284
 285 /* Return a single string of the `sequences' joined by a space (' '). */
 286 static char *
 287 join_sequences(char *sequences[])
 288 {
 289     int i;
 290     size_t len = 0;
 291     char *result, *cp;
 292
 293     for (i = 0; sequences[i] != NULL; i++) {
 294         len += strlen(sequences[i]) + 1;
 295     }
 296     result = mh_xmalloc(len + 1);
 297
 298     for (i = 0, cp = result; sequences[i] != NULL; i++, cp += len + 1) {
 299         len = strlen(sequences[i]);
 300         memcpy(cp, sequences[i], len);
 301         cp[len] = ' ';
 302     }
 303     /* -1 to overwrite the last delimiter */
 304     *--cp = '\0';
 305
 306     return result;
 307 }
 308
 309 /* Return a struct node for the folder to change to.  This is the next
 310  * (previous, if FPREV mode) folder with desired messages, or the current
 311  * folder if no folders have desired.  If NEW or UNSEEN mode, print the
 312  * output but don't change folders.
 313  *
 314  * n_name is the folder to change to, and n_field is the string list of
 315  * desired message numbers.
 316  */
 317 static struct node *
 318 doit(char *cur, char *folders, char *sequences[])
 319 {
 320     struct node *first, *cur_node, *node, *last, *prev;
 321     size_t folder_len;
 322     int count, total = 0;
 323     char *command = NULL, *sequences_s = NULL;
 324
 325     if (cur == NULL || cur[0] == '\0') {
 326         cur = "inbox";
 327     }
 328
 329     check_folders(&first, &last, &cur_node, &folder_len, cur,
 330                   folders, sequences);
 331
 332     if (run_mode == FNEXT || run_mode == FPREV) {
 333         if (first == NULL) {
 334             /* No folders at all... */
 335             return NULL;
 336         } else if (first->n_next == NULL) {
 337             /* We have only one node; any desired messages in it? */
 338             if (first->n_field == NULL) {
 339                 return NULL;
 340             } else {
 341                 return first;
 342             }
 343         } else if (cur_node == NULL) {
 344             /* Current folder is not listed in .folders, return first. */
 345             return first;
 346         }
 347     } else if (run_mode == UNSEEN) {
 348         sequences_s = join_sequences(sequences);
 349     }
 350
 351     for (node = first, prev = NULL;
 352          node != NULL;
 353          prev = node, node = node->n_next) {
 354         if (run_mode == FNEXT) {
 355             /* If we have a previous node and it is the current
 356              * folder, return this node. */
 357             if (prev != NULL && strcmp(prev->n_name, cur) == 0) {
 358                 return node;
 359             }
 360         } else if (run_mode == FPREV) {
 361             if (strcmp(node->n_name, cur) == 0) {
 362                 /* Found current folder in fprev mode; if we have a
 363                  * previous node in the list, return it; else return
 364                  * the last node. */
 365                 if (prev == NULL) {
 366                     return last;
 367                 }
 368                 return prev;
 369             }
 370         } else if (run_mode == UNSEEN) {
 371             if (node->n_field == NULL) {
 372                 continue;
 373             }
 374
 375             printf("\n%d %s messages in %s",
 376                    count_messages(node->n_field),
 377                    sequences_s,
 378                    node->n_name);
 379             if (strcmp(node->n_name, cur) == 0) {
 380                 puts(" (*: current folder)");
 381             } else {
 382                 puts("");
 383             }
 384             fflush(stdout);
 385
 386             /* TODO: Split enough of scan.c out so that we can call it here. */
 387             command = concat("scan +", node->n_name, " ", sequences_s,
 388                              (void *)NULL);
 389             system(command);
 390             free(command);
 391         } else {
 392             if (node->n_field == NULL) {
 393                 continue;
 394             }
 395
 396             count = count_messages(node->n_field);
 397             total += count;
 398
 399             printf("%-*s %6d.%c %s\n",
 400                    (int) folder_len, node->n_name,
 401                    count,
 402                    (strcmp(node->n_name, cur) == 0 ? '*' : ' '),
 403                    node->n_field);
 404         }
 405     }
 406
 407     /* If we're fnext, we haven't checked the last node yet.  If it's the
 408      * current folder, return the first node. */
 409     if (run_mode == FNEXT) {
 410         assert(last != NULL);
 411         if (strcmp(last->n_name, cur) == 0) {
 412             return first;
 413         }
 414     }
 415
 416     if (run_mode == NEW) {
 417         printf("%-*s %6d.\n", (int) folder_len, " total", total);
 418     }
 419
 420     return cur_node;
 421 }
 422
 423 int
 424 main(int argc, char **argv)
 425 {
 426     char **ap, *cp, **argp, **arguments;
 427     char help[BUFSIZ];
 428     char *folders = NULL;
 429     svector_t sequences = svector_create (0);
 430     int i = 0;
 431     char *unseen;
 432     struct node *folder;
 433
 434     if (nmh_init(argv[0], 1)) { return 1; }
 435
 436     arguments = getarguments (invo_name, argc, argv, 1);
 437     argp = arguments;
 438
 439     /*
 440      * Parse arguments
 441      */
 442     while ((cp = *argp++)) {
 443         if (*cp == '-') {
 444             switch (smatch (++cp, switches)) {
 445             case AMBIGSW:
 446                 ambigsw (cp, switches);
 447                 done (1);
 448             case UNKWNSW:
 449                 adios (NULL, "-%s unknown", cp);
 450
 451             case HELPSW:
 452                 snprintf (help, sizeof(help), "%s [switches] [sequences]",
 453                           invo_name);
 454                 print_help (help, switches, 1);
 455                 done (0);
 456             case VERSIONSW:
 457                 print_version(invo_name);
 458                 done (0);
 459
 460             case FOLDERSSW:
 461                 if (!(folders = *argp++) || *folders == '-')
 462                     adios(NULL, "missing argument to %s", argp[-2]);
 463                 continue;
 464             case MODESW:
 465                 if (!(invo_name = *argp++) || *invo_name == '-')
 466                     adios(NULL, "missing argument to %s", argp[-2]);
 467                 invo_name = r1bindex(invo_name, '/');
 468                 continue;
 469             }
 470         }
 471         /* have a sequence argument */
 472         if (!seq_in_list(cp, svector_strs (sequences))) {
 473             svector_push_back (sequences, cp);
 474             ++i;
 475         }
 476     }
 477
 478     if (strcmp(invo_name, "fnext") == 0) {
 479         run_mode = FNEXT;
 480     } else if (strcmp(invo_name, "fprev") == 0) {
 481         run_mode = FPREV;
 482     } else if (strcmp(invo_name, "unseen") == 0) {
 483         run_mode = UNSEEN;
 484     }
 485
 486     if (folders == NULL) {
 487         /* will flists */
 488     } else {
 489         if (folders[0] != '/') {
 490             folders = m_maildir(folders);
 491         }
 492     }
 493
 494     if (i == 0) {
 495         /* no sequence arguments; use unseen */
 496         unseen = context_find(usequence);
 497         if (unseen == NULL || unseen[0] == '\0') {
 498             adios(NULL, "must specify sequences or set %s", usequence);
 499         }
 500         for (ap = brkstring(unseen, " ", "\n"); *ap; ap++) {
 501             svector_push_back (sequences, *ap);
 502             ++i;
 503         }
 504     }
 505
 506     folder = doit(context_find(pfolder), folders, svector_strs (sequences));
 507     if (folder == NULL) {
 508         done(0);
 509         return 1;
 510     }
 511
 512     if (run_mode == UNSEEN) {
 513         /* All the scan(1)s it runs change the current folder, so we
 514          * need to put it back.  Unfortunately, context_replace lamely
 515          * ignores the new value you give it if it is the same one it
 516          * has in memory.  So, we'll be lame, too.  I'm not sure if i
 517          * should just change context_replace... */
 518         context_replace(pfolder, "defeat_context_replace_optimization");
 519     }
 520
 521     /* update current folder */
 522     context_replace(pfolder, folder->n_name);
 523
 524     if (run_mode == FNEXT || run_mode == FPREV) {
 525         printf("%s  %s\n", folder->n_name, folder->n_field);
 526     }
 527
 528     context_save();
 529
 530     svector_free (sequences);
 531     done (0);
 532     return 1;
 533 }