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

   1 /* new.c -- as new,    list all folders with unseen messages
   2  *       -- as fnext,  move to next folder with unseen messages
   3  *       -- as fprev,  move to previous folder with unseen messages
   4  *       -- as unseen, scan all unseen messages
   5  * This code is Copyright (c) 2008, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  *
   9  * Inspired by Luke Mewburn's new: http://www.mewburn.net/luke/src/new
  10  */
  11
  12 #include <sys/types.h>
  13
  14 #include <h/mh.h>
  15 #include <h/crawl_folders.h>
  16 #include <h/utils.h>
  17 #include "sbr/lock_file.h"
  18 #include "sbr/m_maildir.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 /* What to do, based on argv[0]. */
  35 static enum {
  36     RM_NEW,
  37     RM_FNEXT,
  38     RM_FPREV,
  39     RM_UNSEEN
  40 } run_mode = RM_NEW;
  41
  42 /* check_folders uses this to maintain state with both .folders list of
  43  * folders and with crawl_folders. */
  44 struct list_state {
  45     struct node **first, **cur_node;
  46     size_t *maxlen;
  47     char *cur;
  48     char **sequences;
  49     struct node *node;
  50 };
  51
  52 /* Return the number of messages in a string list of message numbers. */
  53 static int
  54 count_messages(char *field)
  55 {
  56     int total = 0;
  57     int j, k;
  58     char *cp, **ap;
  59
  60     field = getcpy(field);
  61
  62     /* copied from seq_read.c:seq_init */
  63     for (ap = brkstring (field, " ", "\n"); *ap; ap++) {
  64         if ((cp = strchr(*ap, '-')))
  65             *cp++ = '\0';
  66         if ((j = m_atoi (*ap)) > 0) {
  67             k = cp ? m_atoi (cp) : j;
  68
  69             total += k - j + 1;
  70         }
  71     }
  72
  73     free(field);
  74
  75     return total;
  76 }
  77
  78 /* Return true if the sequence 'name' is in 'sequences'. */
  79 static bool
  80 seq_in_list(char *name, char *sequences[])
  81 {
  82     int i;
  83
  84     for (i = 0; sequences[i] != NULL; i++) {
  85         if (strcmp(name, sequences[i]) == 0) {
  86             return true;
  87         }
  88     }
  89
  90     return false;
  91 }
  92
  93 /* Return the string list of message numbers from the sequences file, or NULL
  94  * if none. */
  95 static char *
  96 get_msgnums(char *folder, char *sequences[])
  97 {
  98     char *seqfile = NULL;
  99     FILE *fp;
 100     int state;
 101     char name[NAMESZ], field[NMH_BUFSIZ];
 102     char *cp;
 103     char *msgnums = NULL, *this_msgnums, *old_msgnums;
 104     int failed_to_lock = 0;
 105     m_getfld_state_t gstate;
 106
 107     /* copied from seq_read.c:seq_public */
 108     /*
 109      * If mh_seq == NULL or if *mh_seq == '\0' (the user has defined
 110      * the "mh-sequences" profile entry, but left it empty),
 111      * then just return, and do not initialize any public sequences.
 112      */
 113     if (mh_seq == NULL || *mh_seq == '\0')
 114         return NULL;
 115
 116     /* get filename of sequence file */
 117     seqfile = concat(m_maildir(folder), "/", mh_seq, (void *)NULL);
 118
 119     if (seqfile == NULL)
 120         return NULL;
 121
 122     if ((fp = lkfopendata (seqfile, "r", & failed_to_lock)) == NULL) {
 123         if (failed_to_lock)
 124             adios (seqfile, "failed to lock");
 125         free(seqfile);
 126         return NULL;
 127     }
 128
 129     /* Use m_getfld2 to scan sequence file */
 130     gstate = m_getfld_state_init(fp);
 131     for (;;) {
 132         int fieldsz = sizeof field;
 133         switch (state = m_getfld2(&gstate, name, field, &fieldsz)) {
 134             case FLD:
 135             case FLDPLUS:
 136                 if (state == FLDPLUS) {
 137                     cp = getcpy (field);
 138                     while (state == FLDPLUS) {
 139                         fieldsz = sizeof field;
 140                         state = m_getfld2(&gstate, name, field, &fieldsz);
 141                         cp = add (field, cp);
 142                     }
 143
 144                     /* Here's where we differ from seq_public: if it's in a
 145                      * sequence we want, save the list of messages. */
 146                     if (seq_in_list(name, sequences)) {
 147                         this_msgnums = trimcpy(cp);
 148                         if (msgnums == NULL) {
 149                             msgnums = this_msgnums;
 150                         } else {
 151                             old_msgnums = msgnums;
 152                             msgnums = concat(old_msgnums, " ",
 153                                              this_msgnums, (void *)NULL);
 154                             free(old_msgnums);
 155                             free(this_msgnums);
 156                         }
 157                     }
 158                     free (cp);
 159                 } else {
 160                     /* and here */
 161                     if (seq_in_list(name, sequences)) {
 162                         this_msgnums = trimcpy(field);
 163                         if (msgnums == NULL) {
 164                             msgnums = this_msgnums;
 165                         } else {
 166                             old_msgnums = msgnums;
 167                             msgnums = concat(old_msgnums, " ",
 168                                              this_msgnums, (void *)NULL);
 169                             free(old_msgnums);
 170                             free(this_msgnums);
 171                         }
 172                     }
 173                 }
 174
 175                 continue;
 176
 177             case BODY:
 178                 adios (NULL, "no blank lines are permitted in %s", seqfile);
 179                 break;
 180
 181             case FILEEOF:
 182                 break;
 183
 184             default:
 185                 adios (NULL, "%s is poorly formatted", seqfile);
 186         }
 187         break;  /* break from for loop */
 188     }
 189     m_getfld_state_destroy (&gstate);
 190
 191     lkfclosedata (fp, seqfile);
 192
 193     free(seqfile);
 194
 195     return msgnums;
 196 }
 197
 198 /* Check `folder' (of length `len') for interesting messages, filling in the
 199  * list in `b'. */
 200 static void
 201 check_folder(char *folder, size_t len, struct list_state *b)
 202 {
 203     char *msgnums = get_msgnums(folder, b->sequences);
 204     int is_cur = strcmp(folder, b->cur) == 0;
 205
 206     if (is_cur || msgnums != NULL) {
 207         if (*b->first == NULL) {
 208             NEW(b->node);
 209             *b->first = b->node;
 210         } else {
 211             NEW(b->node->n_next);
 212             b->node = b->node->n_next;
 213         }
 214         b->node->n_name = folder;
 215         b->node->n_field = msgnums;
 216
 217         if (*b->maxlen < len) {
 218             *b->maxlen = len;
 219         }
 220     }
 221
 222     /* Save the node for the current folder, so we can fall back to it. */
 223     if (is_cur) {
 224         *b->cur_node = b->node;
 225     }
 226 }
 227
 228 static bool
 229 crawl_callback(char *folder, void *baton)
 230 {
 231     check_folder(folder, strlen(folder), baton);
 232     return true;
 233 }
 234
 235 /* Scan folders, returning:
 236  * first        -- list of nodes for all folders which have desired messages;
 237  *                 if the current folder is listed in .folders, it is also in
 238  *                 the list regardless of whether it has any desired messages
 239  * last         -- last node in list
 240  * cur_node     -- node of current folder, if listed in .folders
 241  * maxlen       -- length of longest folder name
 242  *
 243  * `cur' points to the name of the current folder, `folders' points to the
 244  * name of a .folder (if NULL, crawl all folders), and `sequences' points to
 245  * the array of sequences for which to look.
 246  *
 247  * An empty list is returned as first=last=NULL.
 248  */
 249 static void
 250 check_folders(struct node **first, struct node **last,
 251               struct node **cur_node, size_t *maxlen,
 252               char *cur, char *folders, char *sequences[])
 253 {
 254     struct list_state b;
 255     FILE *fp;
 256     char *line;
 257     size_t len;
 258
 259     *first = *last = *cur_node = NULL;
 260     *maxlen = 0;
 261
 262     b.first = first;
 263     b.cur_node = cur_node;
 264     b.maxlen = maxlen;
 265     b.cur = cur;
 266     b.sequences = sequences;
 267
 268     if (folders == NULL) {
 269         if (chdir(m_maildir("")) < 0) {
 270             advise (m_maildir(""), "chdir");
 271         }
 272         crawl_folders(".", crawl_callback, &b);
 273     } else {
 274         fp = fopen(folders, "r");
 275         if (fp  == NULL) {
 276             adios(NULL, "failed to read %s", folders);
 277         }
 278         while (vfgets(fp, &line) == OK) {
 279             len = strlen(line) - 1;
 280             line[len] = '\0';
 281             check_folder(mh_xstrdup(line), len, &b);
 282         }
 283         fclose(fp);
 284     }
 285
 286     if (*first != NULL) {
 287         b.node->n_next = NULL;
 288         *last = b.node;
 289     }
 290 }
 291
 292 /* Return a single string of the `sequences' joined by a space (' '). */
 293 static char *
 294 join_sequences(char *sequences[])
 295 {
 296     int i;
 297     size_t len = 0;
 298     char *result, *cp;
 299
 300     for (i = 0; sequences[i] != NULL; i++) {
 301         len += strlen(sequences[i]) + 1;
 302     }
 303     result = mh_xmalloc(len + 1);
 304
 305     for (i = 0, cp = result; sequences[i] != NULL; i++, cp += len + 1) {
 306         len = strlen(sequences[i]);
 307         memcpy(cp, sequences[i], len);
 308         cp[len] = ' ';
 309     }
 310     /* -1 to overwrite the last delimiter */
 311     *--cp = '\0';
 312
 313     return result;
 314 }
 315
 316 /* Return a struct node for the folder to change to.  This is the next
 317  * (previous, if RM_FPREV mode) folder with desired messages, or the current
 318  * folder if no folders have desired.  If RM_NEW or RM_UNSEEN mode, print the
 319  * output but don't change folders.
 320  *
 321  * n_name is the folder to change to, and n_field is the string list of
 322  * desired message numbers.
 323  */
 324 static struct node *
 325 doit(char *cur, char *folders, char *sequences[])
 326 {
 327     struct node *first, *cur_node, *node, *last, *prev;
 328     size_t folder_len;
 329     int count, total = 0;
 330     char *command = NULL, *sequences_s = NULL;
 331
 332     if (cur == NULL || cur[0] == '\0') {
 333         cur = "inbox";
 334     }
 335
 336     check_folders(&first, &last, &cur_node, &folder_len, cur,
 337                   folders, sequences);
 338
 339     if (run_mode == RM_FNEXT || run_mode == RM_FPREV) {
 340         if (first == NULL) {
 341             /* No folders at all... */
 342             return NULL;
 343         }
 344         if (first->n_next == NULL) {
 345             /* We have only one node; any desired messages in it? */
 346             if (first->n_field == NULL) {
 347                 return NULL;
 348             }
 349             return first;
 350         }
 351         if (cur_node == NULL) {
 352             /* Current folder is not listed in .folders, return first. */
 353             return first;
 354         }
 355     } else if (run_mode == RM_UNSEEN) {
 356         sequences_s = join_sequences(sequences);
 357     }
 358
 359     for (node = first, prev = NULL;
 360          node != NULL;
 361          prev = node, node = node->n_next) {
 362         if (run_mode == RM_FNEXT) {
 363             /* If we have a previous node and it is the current
 364              * folder, return this node. */
 365             if (prev != NULL && strcmp(prev->n_name, cur) == 0) {
 366                 return node;
 367             }
 368         } else if (run_mode == RM_FPREV) {
 369             if (strcmp(node->n_name, cur) == 0) {
 370                 /* Found current folder in fprev mode; if we have a
 371                  * previous node in the list, return it; else return
 372                  * the last node. */
 373                 if (prev == NULL) {
 374                     return last;
 375                 }
 376                 return prev;
 377             }
 378         } else if (run_mode == RM_UNSEEN) {
 379             int status;
 380
 381             if (node->n_field == NULL) {
 382                 continue;
 383             }
 384
 385             printf("\n%d %s messages in %s",
 386                    count_messages(node->n_field),
 387                    sequences_s,
 388                    node->n_name);
 389             if (strcmp(node->n_name, cur) == 0) {
 390                 puts(" (*: current folder)");
 391             } else {
 392                 putchar('\n');
 393             }
 394             fflush(stdout);
 395
 396             /* TODO: Split enough of scan.c out so that we can call it here. */
 397             command = concat("scan +", node->n_name, " ", sequences_s,
 398                              (void *)NULL);
 399             status = system(command);
 400             if (! WIFEXITED (status)) {
 401                 adios (command, "system");
 402             }
 403             free(command);
 404         } else {
 405             if (node->n_field == NULL) {
 406                 continue;
 407             }
 408
 409             count = count_messages(node->n_field);
 410             total += count;
 411
 412             printf("%-*s %6d.%c %s\n",
 413                    (int) folder_len, node->n_name,
 414                    count,
 415                    (strcmp(node->n_name, cur) == 0 ? '*' : ' '),
 416                    node->n_field);
 417         }
 418     }
 419
 420     /* If we're fnext, we haven't checked the last node yet.  If it's the
 421      * current folder, return the first node. */
 422     if (run_mode == RM_FNEXT) {
 423         assert(last != NULL);
 424         if (strcmp(last->n_name, cur) == 0) {
 425             return first;
 426         }
 427     }
 428
 429     if (run_mode == RM_NEW) {
 430         printf("%-*s %6d.\n", (int) folder_len, " total", total);
 431     }
 432
 433     return cur_node;
 434 }
 435
 436 int
 437 main(int argc, char **argv)
 438 {
 439     char **ap, *cp, **argp, **arguments;
 440     char help[BUFSIZ];
 441     char *folders = NULL;
 442     svector_t sequences = svector_create (0);
 443     int i = 0;
 444     char *unseen;
 445     struct node *folder;
 446
 447     if (nmh_init(argv[0], 1)) { return 1; }
 448
 449     arguments = getarguments (invo_name, argc, argv, 1);
 450     argp = arguments;
 451
 452     /*
 453      * Parse arguments
 454      */
 455     while ((cp = *argp++)) {
 456         if (*cp == '-') {
 457             switch (smatch (++cp, switches)) {
 458             case AMBIGSW:
 459                 ambigsw (cp, switches);
 460                 done (1);
 461             case UNKWNSW:
 462                 adios (NULL, "-%s unknown", cp);
 463
 464             case HELPSW:
 465                 snprintf (help, sizeof(help), "%s [switches] [sequences]",
 466                           invo_name);
 467                 print_help (help, switches, 1);
 468                 done (0);
 469             case VERSIONSW:
 470                 print_version(invo_name);
 471                 done (0);
 472
 473             case FOLDERSSW:
 474                 if (!(folders = *argp++) || *folders == '-')
 475                     adios(NULL, "missing argument to %s", argp[-2]);
 476                 continue;
 477             case MODESW:
 478                 if (!(invo_name = *argp++) || *invo_name == '-')
 479                     adios(NULL, "missing argument to %s", argp[-2]);
 480                 invo_name = r1bindex(invo_name, '/');
 481                 continue;
 482             }
 483         }
 484         /* have a sequence argument */
 485         if (!seq_in_list(cp, svector_strs (sequences))) {
 486             svector_push_back (sequences, cp);
 487             ++i;
 488         }
 489     }
 490
 491     if (strcmp(invo_name, "fnext") == 0) {
 492         run_mode = RM_FNEXT;
 493     } else if (strcmp(invo_name, "fprev") == 0) {
 494         run_mode = RM_FPREV;
 495     } else if (strcmp(invo_name, "unseen") == 0) {
 496         run_mode = RM_UNSEEN;
 497     }
 498
 499     if (folders == NULL) {
 500         /* will flists */
 501     } else {
 502         if (folders[0] != '/') {
 503             folders = m_maildir(folders);
 504         }
 505     }
 506
 507     if (i == 0) {
 508         /* no sequence arguments; use unseen */
 509         unseen = context_find(usequence);
 510         if (unseen == NULL || unseen[0] == '\0') {
 511             adios(NULL, "must specify sequences or set %s", usequence);
 512         }
 513         for (ap = brkstring(unseen, " ", "\n"); *ap; ap++) {
 514             svector_push_back (sequences, *ap);
 515             ++i;
 516         }
 517     }
 518
 519     folder = doit(context_find(pfolder), folders, svector_strs (sequences));
 520     if (folder == NULL) {
 521         done(0);
 522         return 1;
 523     }
 524
 525     if (run_mode == RM_UNSEEN) {
 526         /* All the scan(1)s it runs change the current folder, so we
 527          * need to put it back.  Unfortunately, context_replace lamely
 528          * ignores the new value you give it if it is the same one it
 529          * has in memory.  So, we'll be lame, too.  I'm not sure if i
 530          * should just change context_replace... */
 531         context_replace(pfolder, "defeat_context_replace_optimization");
 532     }
 533
 534     /* update current folder */
 535     context_replace(pfolder, folder->n_name);
 536
 537     if (run_mode == RM_FNEXT || run_mode == RM_FPREV) {
 538         printf("%s  %s\n", folder->n_name, folder->n_field);
 539     }
 540
 541     context_save();
 542
 543     svector_free (sequences);
 544     done (0);
 545     return 1;
 546 }