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     if (nmh_init(argv[0], 2)) { return 1; }
  82
  83     arguments = getarguments (invo_name, argc, argv, 1);
  84     argp = arguments;
  85
  86     while ((cp = *argp++))
  87         if (*cp == '-') {
  88             switch (smatch (++cp, switches)) {
  89                 case AMBIGSW:
  90                     ambigsw (cp, switches);
  91                     done (1);
  92                 case UNKWNSW:
  93                     adios (NULL, "-%s unknown", cp);
  94
  95                 case HELPSW:
  96                     snprintf (buffer, sizeof(buffer), "%s [switches] file",
  97                         invo_name);
  98                     print_help (buffer, switches, 1);
  99                     done (0);
 100                 case VERSIONSW:
 101                     print_version(invo_name);
 102                     done (0);
 103
 104                 case ERASESW:
 105                     if (!(erasep = *argp++) || *erasep == '-')
 106                         adios (NULL, "missing argument to %s", argp[-2]);
 107                     continue;
 108                 case KILLSW:
 109                     if (!(killp = *argp++) || *killp == '-')
 110                         adios (NULL, "missing argument to %s", argp[-2]);
 111                     continue;
 112
 113                 case PREPSW:
 114                     prepend++;
 115                     continue;
 116                 case NPREPSW:
 117                     prepend = 0;
 118                     continue;
 119
 120                 case RAPDSW:
 121                     rapid++;
 122                     continue;
 123                 case NRAPDSW:
 124                     rapid = 0;
 125                     continue;
 126
 127                 case BODYSW:
 128                     body++;
 129                     continue;
 130                 case NBODYSW:
 131                     body = 0;
 132                     continue;
 133
 134                 case DOTSW:
 135                     doteof++;
 136                     continue;
 137                 case NDOTSW:
 138                     doteof = 0;
 139                     continue;
 140             }
 141         } else {
 142             if (!drft)
 143                 drft = cp;
 144         }
 145
 146     if (!drft)
 147         adios (NULL, "usage: %s [switches] file", invo_name);
 148     if ((in = fopen (drft, "r")) == NULL)
 149         adios (drft, "unable to open");
 150
 151     if ((tmpfil = m_mktemp2(NULL, invo_name, NULL, &out)) == NULL) {
 152         adios(NULL, "unable to create temporary file in %s", get_temp_dir());
 153     }
 154
 155     /*
 156      * Are we changing the kill or erase character?
 157      */
 158     if (killp || erasep) {
 159         cc_t save_erase, save_kill;
 160
 161         /* get the current terminal attributes */
 162         tcgetattr(0, &tio);
 163
 164         /* save original kill, erase character for later */
 165         save_kill = KILL;
 166         save_erase = ERASE;
 167
 168         /* set new kill, erase character in terminal structure */
 169         KILL = killp ? chrcnv (killp) : save_kill;
 170         ERASE = erasep ? chrcnv (erasep) : save_erase;
 171
 172         /* set the new terminal attributes */
 173          tcsetattr(0, TCSADRAIN, &tio);
 174
 175         /* print out new kill erase characters */
 176         chrdsp ("erase", ERASE);
 177         chrdsp (", kill", KILL);
 178         chrdsp (", intr", INTR);
 179         putchar ('\n');
 180         fflush (stdout);
 181
 182         /*
 183          * We set the kill and erase character back to original
 184          * setup in terminal structure so we can easily
 185          * restore it upon exit.
 186          */
 187         KILL = save_kill;
 188         ERASE = save_erase;
 189     }
 190
 191     sigint = 0;
 192     SIGNAL2 (SIGINT, intrser);
 193
 194     /*
 195      * Loop through the lines of the draft skeleton.
 196      */
 197     for (;;) {
 198         int fieldsz = sizeof field;
 199         switch (state = m_getfld (&gstate, name, field, &fieldsz, in)) {
 200             case FLD:
 201             case FLDPLUS:
 202                 /*
 203                  * Check if the value of field contains anything
 204                  * other than space or tab.
 205                  */
 206                 for (cp = field; *cp; cp++)
 207                     if (*cp != ' ' && *cp != '\t')
 208                         break;
 209
 210                 /* If so, just add header line to draft */
 211                 if (*cp++ != '\n' || *cp != 0) {
 212                     printf ("%s:%s", name, field);
 213                     fprintf (out, "%s:%s", name, field);
 214                     while (state == FLDPLUS) {
 215                         fieldsz = sizeof field;
 216                         state = m_getfld (&gstate, name, field, &fieldsz, in);
 217                         fputs(field, stdout);
 218                         fputs(field, out);
 219                     }
 220                 } else {
 221                     /* Else, get value of header field */
 222                     printf ("%s: ", name);
 223                     fflush (stdout);
 224                     i = getln (field, sizeof(field));
 225                     if (i == -1) {
 226 abort:
 227                         if (killp || erasep) {
 228                             tcsetattr(0, TCSADRAIN, &tio);
 229                         }
 230                         (void) m_unlink (tmpfil);
 231                         done (1);
 232                     }
 233                     if (i != 0 || (field[0] != '\n' && field[0] != 0)) {
 234                         fprintf (out, "%s:", name);
 235                         do {
 236                             if (field[0] != ' ' && field[0] != '\t')
 237                                 putc (' ', out);
 238                             fputs(field, out);
 239                         } while (i == 1
 240                                     && (i = getln (field, sizeof(field))) >= 0);
 241                         if (i == -1)
 242                             goto abort;
 243                     }
 244                 }
 245
 246                 continue;
 247
 248             case BODY:
 249             case FILEEOF:
 250                 if (!body)
 251                     break;
 252                 fprintf (out, "--------\n");
 253                 if (field[0] == 0 || !prepend)
 254                     puts("--------");
 255                 if (field[0]) {
 256                     if (prepend && body) {
 257                         printf ("\n--------Enter initial text\n\n");
 258                         fflush (stdout);
 259                         for (;;) {
 260                             getln (buffer, sizeof(buffer));
 261                             if (doteof && buffer[0] == '.' && buffer[1] == '\n')
 262                                 break;
 263                             if (buffer[0] == 0)
 264                                 break;
 265                             fputs(buffer, out);
 266                         }
 267                     }
 268
 269                     do {
 270                         fputs(field, out);
 271                         if (!rapid && !sigint)
 272                             fputs(field, stdout);
 273                     } while (state == BODY &&
 274                             (fieldsz = sizeof field,
 275                              state = m_getfld (&gstate, name, field, &fieldsz, in)));
 276                     if (prepend || !body)
 277                         break;
 278                     else
 279                         printf ("\n--------Enter additional text\n\n");
 280                 }
 281
 282                 fflush (stdout);
 283                 for (;;) {
 284                     getln (field, sizeof(field));
 285                     if (doteof && field[0] == '.' && field[1] == '\n')
 286                         break;
 287                     if (field[0] == 0)
 288                         break;
 289                     fputs(field, out);
 290                 }
 291                 break;
 292
 293             default:
 294                 adios (NULL, "skeleton is poorly formatted");
 295         }
 296         break;
 297     }
 298     m_getfld_state_destroy (&gstate);
 299
 300     if (body)
 301         puts("--------");
 302
 303     fflush (stdout);
 304     fclose (in);
 305     fclose (out);
 306     SIGNAL (SIGINT, SIG_IGN);
 307
 308     if (killp || erasep) {
 309          tcsetattr(0, TCSADRAIN, &tio);
 310     }
 311
 312     if ((fdi = open (tmpfil, O_RDONLY)) == NOTOK)
 313         adios (tmpfil, "unable to re-open");
 314     if ((fdo = creat (drft, m_gmprot ())) == NOTOK)
 315         adios (drft, "unable to write");
 316     cpydata (fdi, fdo, tmpfil, drft);
 317     close (fdi);
 318     close (fdo);
 319     (void) m_unlink (tmpfil);
 320
 321     context_save ();    /* save the context file */
 322     done (0);
 323     return 1;
 324 }
 325
 326
 327 int
 328 getln (char *buffer, int n)
 329 {
 330     int c;
 331     char *cp;
 332     static int quoting = 0;
 333
 334     *buffer = 0;
 335
 336     switch (setjmp (sigenv)) {
 337         case OK:
 338             wtuser = 1;
 339             break;
 340
 341         case DONE:
 342             wtuser = 0;
 343             return 0;
 344
 345         default:
 346             wtuser = 0;
 347             return NOTOK;
 348     }
 349
 350     cp = buffer;
 351     *cp = 0;
 352
 353     for (;;) {
 354         switch (c = getchar ()) {
 355             case EOF:
 356                 quoting = 0;
 357                 clearerr (stdin);
 358                 longjmp (sigenv, DONE);
 359
 360             case '\n':
 361                 if (quoting) {
 362                     *(cp - 1) = c;
 363                     quoting = 0;
 364                     wtuser = 0;
 365                     return 1;
 366                 }
 367                 *cp++ = c;
 368                 *cp = 0;
 369                 wtuser = 0;
 370                 return 0;
 371
 372             default:
 373                 if (c == QUOTE) {
 374                     quoting = 1;
 375                 } else {
 376                     quoting = 0;
 377                 }
 378                 if (cp < buffer + n)
 379                     *cp++ = c;
 380                 *cp = 0;
 381         }
 382     }
 383 }
 384
 385
 386 static void
 387 intrser (int i)
 388 {
 389     NMH_UNUSED (i);
 390
 391     if (wtuser)
 392         longjmp (sigenv, NOTOK);
 393     sigint++;
 394 }
 395
 396
 397 static int
 398 chrcnv (char *cp)
 399 {
 400     return (*cp != QUOTE ? *cp : m_atoi (++cp));
 401 }
 402
 403
 404 static void
 405 chrdsp (char *s, char c)
 406 {
 407     printf ("%s ", s);
 408     if (c < ' ' || c == 0177)
 409         printf ("^%c", c ^ 0100);
 410     else
 411         printf ("%c", c);
 412 }