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

   1
   2 /*
   3  * prompter.c -- simple prompting editor front-end
   4  *
   5  * This code is Copyright (c) 2002, 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
  10 #include <h/mh.h>
  11 #include <fcntl.h>
  12 #include <h/signals.h>
  13 #include <setjmp.h>
  14
  15 #include <termios.h>
  16
  17 #define QUOTE '\\'
  18
  19 #ifndef CKILL
  20 # define CKILL '@'
  21 #endif
  22
  23 #ifndef CERASE
  24 # define CERASE '#'
  25 #endif
  26
  27 #define PROMPTER_SWITCHES \
  28     X("erase chr", 0, ERASESW) \
  29     X("kill chr", 0, KILLSW) \
  30     X("prepend", 0, PREPSW) \
  31     X("noprepend", 0, NPREPSW) \
  32     X("rapid", 0, RAPDSW) \
  33     X("norapid", 0, NRAPDSW) \
  34     X("body", -4, BODYSW) \
  35     X("nobody", -6, NBODYSW) \
  36     X("doteof", 0, DOTSW) \
  37     X("nodoteof", 0, NDOTSW) \
  38     X("version", 0, VERSIONSW) \
  39     X("help", 0, HELPSW) \
  40
  41 #define X(sw, minchars, id) id,
  42 DEFINE_SWITCH_ENUM(PROMPTER);
  43 #undef X
  44
  45 #define X(sw, minchars, id) { sw, minchars, id },
  46 DEFINE_SWITCH_ARRAY(PROMPTER, switches);
  47 #undef X
  48
  49
  50 static struct termios tio;
  51 #define ERASE tio.c_cc[VERASE]
  52 #define KILL  tio.c_cc[VKILL]
  53 #define INTR  tio.c_cc[VINTR]
  54
  55 static int wtuser = 0;
  56 static int sigint = 0;
  57 static jmp_buf sigenv;
  58
  59 /*
  60  * prototypes
  61  */
  62 int getln (char *, int);
  63 static int chrcnv (char *);
  64 static void chrdsp (char *, char);
  65 static void intrser (int);
  66
  67
  68 int
  69 main (int argc, char **argv)
  70 {
  71     int body = 1, prepend = 1, rapid = 0;
  72     int doteof = 0, fdi, fdo, i, state;
  73     char *cp, *drft = NULL, *erasep = NULL;
  74     char *killp = NULL, name[NAMESZ], field[BUFSIZ];
  75     char buffer[BUFSIZ];
  76     char **arguments, **argp;
  77     FILE *in, *out;
  78     char *tmpfil;
  79     m_getfld_state_t gstate = 0;
  80
  81     setlocale(LC_ALL, "");
  82     invo_name = r1bindex (argv[0], '/');
  83
  84     /* read user profile/context */
  85     context_read();
  86
  87     arguments = getarguments (invo_name, argc, argv, 1);
  88     argp = arguments;
  89
  90     while ((cp = *argp++))
  91         if (*cp == '-') {
  92             switch (smatch (++cp, switches)) {
  93                 case AMBIGSW:
  94                     ambigsw (cp, switches);
  95                     done (1);
  96                 case UNKWNSW:
  97                     adios (NULL, "-%s unknown", cp);
  98
  99                 case HELPSW:
 100                     snprintf (buffer, sizeof(buffer), "%s [switches] file",
 101                         invo_name);
 102                     print_help (buffer, switches, 1);
 103                     done (0);
 104                 case VERSIONSW:
 105                     print_version(invo_name);
 106                     done (0);
 107
 108                 case ERASESW:
 109                     if (!(erasep = *argp++) || *erasep == '-')
 110                         adios (NULL, "missing argument to %s", argp[-2]);
 111                     continue;
 112                 case KILLSW:
 113                     if (!(killp = *argp++) || *killp == '-')
 114                         adios (NULL, "missing argument to %s", argp[-2]);
 115                     continue;
 116
 117                 case PREPSW:
 118                     prepend++;
 119                     continue;
 120                 case NPREPSW:
 121                     prepend = 0;
 122                     continue;
 123
 124                 case RAPDSW:
 125                     rapid++;
 126                     continue;
 127                 case NRAPDSW:
 128                     rapid = 0;
 129                     continue;
 130
 131                 case BODYSW:
 132                     body++;
 133                     continue;
 134                 case NBODYSW:
 135                     body = 0;
 136                     continue;
 137
 138                 case DOTSW:
 139                     doteof++;
 140                     continue;
 141                 case NDOTSW:
 142                     doteof = 0;
 143                     continue;
 144             }
 145         } else {
 146             if (!drft)
 147                 drft = cp;
 148         }
 149
 150     if (!drft)
 151         adios (NULL, "usage: %s [switches] file", invo_name);
 152     if ((in = fopen (drft, "r")) == NULL)
 153         adios (drft, "unable to open");
 154
 155     tmpfil = m_mktemp2(NULL, invo_name, NULL, &out);
 156     if (tmpfil == NULL) adios("prompter", "unable to create temporary file");
 157     chmod (tmpfil, 0600);
 158
 159     /*
 160      * Are we changing the kill or erase character?
 161      */
 162     if (killp || erasep) {
 163         cc_t save_erase, save_kill;
 164
 165         /* get the current terminal attributes */
 166         tcgetattr(0, &tio);
 167
 168         /* save original kill, erase character for later */
 169         save_kill = KILL;
 170         save_erase = ERASE;
 171
 172         /* set new kill, erase character in terminal structure */
 173         KILL = killp ? chrcnv (killp) : save_kill;
 174         ERASE = erasep ? chrcnv (erasep) : save_erase;
 175
 176         /* set the new terminal attributes */
 177          tcsetattr(0, TCSADRAIN, &tio);
 178
 179         /* print out new kill erase characters */
 180         chrdsp ("erase", ERASE);
 181         chrdsp (", kill", KILL);
 182         chrdsp (", intr", INTR);
 183         putchar ('\n');
 184         fflush (stdout);
 185
 186         /*
 187          * We set the kill and erase character back to original
 188          * setup in terminal structure so we can easily
 189          * restore it upon exit.
 190          */
 191         KILL = save_kill;
 192         ERASE = save_erase;
 193     }
 194
 195     sigint = 0;
 196     SIGNAL2 (SIGINT, intrser);
 197
 198     /*
 199      * Loop through the lines of the draft skeleton.
 200      */
 201     for (;;) {
 202         int fieldsz = sizeof field;
 203         switch (state = m_getfld (&gstate, name, field, &fieldsz, in)) {
 204             case FLD:
 205             case FLDPLUS:
 206                 /*
 207                  * Check if the value of field contains anything
 208                  * other than space or tab.
 209                  */
 210                 for (cp = field; *cp; cp++)
 211                     if (*cp != ' ' && *cp != '\t')
 212                         break;
 213
 214                 /* If so, just add header line to draft */
 215                 if (*cp++ != '\n' || *cp != 0) {
 216                     printf ("%s:%s", name, field);
 217                     fprintf (out, "%s:%s", name, field);
 218                     while (state == FLDPLUS) {
 219                         fieldsz = sizeof field;
 220                         state = m_getfld (&gstate, name, field, &fieldsz, in);
 221                         printf ("%s", field);
 222                         fprintf (out, "%s", field);
 223                     }
 224                 } else {
 225                     /* Else, get value of header field */
 226                     printf ("%s: ", name);
 227                     fflush (stdout);
 228                     i = getln (field, sizeof(field));
 229                     if (i == -1) {
 230 abort:
 231                         if (killp || erasep) {
 232                             tcsetattr(0, TCSADRAIN, &tio);
 233                         }
 234                         unlink (tmpfil);
 235                         done (1);
 236                     }
 237                     if (i != 0 || (field[0] != '\n' && field[0] != 0)) {
 238                         fprintf (out, "%s:", name);
 239                         do {
 240                             if (field[0] != ' ' && field[0] != '\t')
 241                                 putc (' ', out);
 242                             fprintf (out, "%s", field);
 243                         } while (i == 1
 244                                     && (i = getln (field, sizeof(field))) >= 0);
 245                         if (i == -1)
 246                             goto abort;
 247                     }
 248                 }
 249
 250                 continue;
 251
 252             case BODY:
 253             case FILEEOF:
 254                 if (!body)
 255                     break;
 256                 fprintf (out, "--------\n");
 257                 if (field[0] == 0 || !prepend)
 258                     printf ("--------\n");
 259                 if (field[0]) {
 260                     if (prepend && body) {
 261                         printf ("\n--------Enter initial text\n\n");
 262                         fflush (stdout);
 263                         for (;;) {
 264                             getln (buffer, sizeof(buffer));
 265                             if (doteof && buffer[0] == '.' && buffer[1] == '\n')
 266                                 break;
 267                             if (buffer[0] == 0)
 268                                 break;
 269                             fprintf (out, "%s", buffer);
 270                         }
 271                     }
 272
 273                     do {
 274                         fprintf (out, "%s", field);
 275                         if (!rapid && !sigint)
 276                             printf ("%s", field);
 277                     } while (state == BODY &&
 278                             (fieldsz = sizeof field,
 279                              state = m_getfld (&gstate, name, field, &fieldsz, in)));
 280                     if (prepend || !body)
 281                         break;
 282                     else
 283                         printf ("\n--------Enter additional text\n\n");
 284                 }
 285
 286                 fflush (stdout);
 287                 for (;;) {
 288                     getln (field, sizeof(field));
 289                     if (doteof && field[0] == '.' && field[1] == '\n')
 290                         break;
 291                     if (field[0] == 0)
 292                         break;
 293                     fprintf (out, "%s", field);
 294                 }
 295                 break;
 296
 297             default:
 298                 adios (NULL, "skeleton is poorly formatted");
 299         }
 300         break;
 301     }
 302     m_getfld_state_destroy (&gstate);
 303
 304     if (body)
 305         printf ("--------\n");
 306
 307     fflush (stdout);
 308     fclose (in);
 309     fclose (out);
 310     SIGNAL (SIGINT, SIG_IGN);
 311
 312     if (killp || erasep) {
 313          tcsetattr(0, TCSADRAIN, &tio);
 314     }
 315
 316     if ((fdi = open (tmpfil, O_RDONLY)) == NOTOK)
 317         adios (tmpfil, "unable to re-open");
 318     if ((fdo = creat (drft, m_gmprot ())) == NOTOK)
 319         adios (drft, "unable to write");
 320     cpydata (fdi, fdo, tmpfil, drft);
 321     close (fdi);
 322     close (fdo);
 323     unlink (tmpfil);
 324
 325     context_save ();    /* save the context file */
 326     done (0);
 327     return 1;
 328 }
 329
 330
 331 int
 332 getln (char *buffer, int n)
 333 {
 334     int c;
 335     char *cp;
 336
 337     cp = buffer;
 338     *cp = 0;
 339
 340     switch (setjmp (sigenv)) {
 341         case OK:
 342             wtuser = 1;
 343             break;
 344
 345         case DONE:
 346             wtuser = 0;
 347             return 0;
 348
 349         default:
 350             wtuser = 0;
 351             return NOTOK;
 352     }
 353
 354     for (;;) {
 355         switch (c = getchar ()) {
 356             case EOF:
 357                 clearerr (stdin);
 358                 longjmp (sigenv, DONE);
 359
 360             case '\n':
 361                 if (cp[-1] == QUOTE) {
 362                     cp[-1] = c;
 363                     wtuser = 0;
 364                     return 1;
 365                 }
 366                 *cp++ = c;
 367                 *cp = 0;
 368                 wtuser = 0;
 369                 return 0;
 370
 371             default:
 372                 if (cp < buffer + n)
 373                     *cp++ = c;
 374                 *cp = 0;
 375         }
 376     }
 377 }
 378
 379
 380 static void
 381 intrser (int i)
 382 {
 383     NMH_UNUSED (i);
 384
 385     if (wtuser)
 386         longjmp (sigenv, NOTOK);
 387     sigint++;
 388 }
 389
 390
 391 static int
 392 chrcnv (char *cp)
 393 {
 394     return (*cp != QUOTE ? *cp : m_atoi (++cp));
 395 }
 396
 397
 398 static void
 399 chrdsp (char *s, char c)
 400 {
 401     printf ("%s ", s);
 402     if (c < ' ' || c == 0177)
 403         printf ("^%c", c ^ 0100);
 404     else
 405         printf ("%c", c);
 406 }