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