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 #ifdef LOCALE
  82     setlocale(LC_ALL, "");
  83 #endif
  84     invo_name = r1bindex (argv[0], '/');
  85
  86     /* read user profile/context */
  87     context_read();
  88
  89     arguments = getarguments (invo_name, argc, argv, 1);
  90     argp = arguments;
  91
  92     while ((cp = *argp++))
  93         if (*cp == '-') {
  94             switch (smatch (++cp, switches)) {
  95                 case AMBIGSW:
  96                     ambigsw (cp, switches);
  97                     done (1);
  98                 case UNKWNSW:
  99                     adios (NULL, "-%s unknown", cp);
 100
 101                 case HELPSW:
 102                     snprintf (buffer, sizeof(buffer), "%s [switches] file",
 103                         invo_name);
 104                     print_help (buffer, switches, 1);
 105                     done (0);
 106                 case VERSIONSW:
 107                     print_version(invo_name);
 108                     done (0);
 109
 110                 case ERASESW:
 111                     if (!(erasep = *argp++) || *erasep == '-')
 112                         adios (NULL, "missing argument to %s", argp[-2]);
 113                     continue;
 114                 case KILLSW:
 115                     if (!(killp = *argp++) || *killp == '-')
 116                         adios (NULL, "missing argument to %s", argp[-2]);
 117                     continue;
 118
 119                 case PREPSW:
 120                     prepend++;
 121                     continue;
 122                 case NPREPSW:
 123                     prepend = 0;
 124                     continue;
 125
 126                 case RAPDSW:
 127                     rapid++;
 128                     continue;
 129                 case NRAPDSW:
 130                     rapid = 0;
 131                     continue;
 132
 133                 case BODYSW:
 134                     body++;
 135                     continue;
 136                 case NBODYSW:
 137                     body = 0;
 138                     continue;
 139
 140                 case DOTSW:
 141                     doteof++;
 142                     continue;
 143                 case NDOTSW:
 144                     doteof = 0;
 145                     continue;
 146             }
 147         } else {
 148             if (!drft)
 149                 drft = cp;
 150         }
 151
 152     if (!drft)
 153         adios (NULL, "usage: %s [switches] file", invo_name);
 154     if ((in = fopen (drft, "r")) == NULL)
 155         adios (drft, "unable to open");
 156
 157     tmpfil = m_mktemp2(NULL, invo_name, NULL, &out);
 158     if (tmpfil == NULL) adios("prompter", "unable to create temporary file");
 159     chmod (tmpfil, 0600);
 160
 161     /*
 162      * Are we changing the kill or erase character?
 163      */
 164     if (killp || erasep) {
 165         cc_t save_erase, save_kill;
 166
 167         /* get the current terminal attributes */
 168         tcgetattr(0, &tio);
 169
 170         /* save original kill, erase character for later */
 171         save_kill = KILL;
 172         save_erase = ERASE;
 173
 174         /* set new kill, erase character in terminal structure */
 175         KILL = killp ? chrcnv (killp) : save_kill;
 176         ERASE = erasep ? chrcnv (erasep) : save_erase;
 177
 178         /* set the new terminal attributes */
 179          tcsetattr(0, TCSADRAIN, &tio);
 180
 181         /* print out new kill erase characters */
 182         chrdsp ("erase", ERASE);
 183         chrdsp (", kill", KILL);
 184         chrdsp (", intr", INTR);
 185         putchar ('\n');
 186         fflush (stdout);
 187
 188         /*
 189          * We set the kill and erase character back to original
 190          * setup in terminal structure so we can easily
 191          * restore it upon exit.
 192          */
 193         KILL = save_kill;
 194         ERASE = save_erase;
 195     }
 196
 197     sigint = 0;
 198     SIGNAL2 (SIGINT, intrser);
 199
 200     /*
 201      * Loop through the lines of the draft skeleton.
 202      */
 203     for (;;) {
 204         int fieldsz = sizeof field;
 205         switch (state = m_getfld (&gstate, name, field, &fieldsz, in)) {
 206             case FLD:
 207             case FLDPLUS:
 208                 /*
 209                  * Check if the value of field contains anything
 210                  * other than space or tab.
 211                  */
 212                 for (cp = field; *cp; cp++)
 213                     if (*cp != ' ' && *cp != '\t')
 214                         break;
 215
 216                 /* If so, just add header line to draft */
 217                 if (*cp++ != '\n' || *cp != 0) {
 218                     printf ("%s:%s", name, field);
 219                     fprintf (out, "%s:%s", name, field);
 220                     while (state == FLDPLUS) {
 221                         fieldsz = sizeof field;
 222                         state = m_getfld (&gstate, name, field, &fieldsz, in);
 223                         printf ("%s", field);
 224                         fprintf (out, "%s", field);
 225                     }
 226                 } else {
 227                     /* Else, get value of header field */
 228                     printf ("%s: ", name);
 229                     fflush (stdout);
 230                     i = getln (field, sizeof(field));
 231                     if (i == -1) {
 232 abort:
 233                         if (killp || erasep) {
 234                             tcsetattr(0, TCSADRAIN, &tio);
 235                         }
 236                         unlink (tmpfil);
 237                         done (1);
 238                     }
 239                     if (i != 0 || (field[0] != '\n' && field[0] != 0)) {
 240                         fprintf (out, "%s:", name);
 241                         do {
 242                             if (field[0] != ' ' && field[0] != '\t')
 243                                 putc (' ', out);
 244                             fprintf (out, "%s", field);
 245                         } while (i == 1
 246                                     && (i = getln (field, sizeof(field))) >= 0);
 247                         if (i == -1)
 248                             goto abort;
 249                     }
 250                 }
 251
 252                 continue;
 253
 254             case BODY:
 255             case FILEEOF:
 256                 if (!body)
 257                     break;
 258                 fprintf (out, "--------\n");
 259                 if (field[0] == 0 || !prepend)
 260                     printf ("--------\n");
 261                 if (field[0]) {
 262                     if (prepend && body) {
 263                         printf ("\n--------Enter initial text\n\n");
 264                         fflush (stdout);
 265                         for (;;) {
 266                             getln (buffer, sizeof(buffer));
 267                             if (doteof && buffer[0] == '.' && buffer[1] == '\n')
 268                                 break;
 269                             if (buffer[0] == 0)
 270                                 break;
 271                             fprintf (out, "%s", buffer);
 272                         }
 273                     }
 274
 275                     do {
 276                         fprintf (out, "%s", field);
 277                         if (!rapid && !sigint)
 278                             printf ("%s", field);
 279                     } while (state == BODY &&
 280                             (fieldsz = sizeof field,
 281                              state = m_getfld (&gstate, name, field, &fieldsz, in)));
 282                     if (prepend || !body)
 283                         break;
 284                     else
 285                         printf ("\n--------Enter additional text\n\n");
 286                 }
 287
 288                 fflush (stdout);
 289                 for (;;) {
 290                     getln (field, sizeof(field));
 291                     if (doteof && field[0] == '.' && field[1] == '\n')
 292                         break;
 293                     if (field[0] == 0)
 294                         break;
 295                     fprintf (out, "%s", field);
 296                 }
 297                 break;
 298
 299             default:
 300                 adios (NULL, "skeleton is poorly formatted");
 301         }
 302         break;
 303     }
 304     m_getfld_state_destroy (&gstate);
 305
 306     if (body)
 307         printf ("--------\n");
 308
 309     fflush (stdout);
 310     fclose (in);
 311     fclose (out);
 312     SIGNAL (SIGINT, SIG_IGN);
 313
 314     if (killp || erasep) {
 315          tcsetattr(0, TCSADRAIN, &tio);
 316     }
 317
 318     if ((fdi = open (tmpfil, O_RDONLY)) == NOTOK)
 319         adios (tmpfil, "unable to re-open");
 320     if ((fdo = creat (drft, m_gmprot ())) == NOTOK)
 321         adios (drft, "unable to write");
 322     cpydata (fdi, fdo, tmpfil, drft);
 323     close (fdi);
 324     close (fdo);
 325     unlink (tmpfil);
 326
 327     context_save ();    /* save the context file */
 328     done (0);
 329     return 1;
 330 }
 331
 332
 333 int
 334 getln (char *buffer, int n)
 335 {
 336     int c;
 337     char *cp;
 338
 339     cp = buffer;
 340     *cp = 0;
 341
 342     switch (setjmp (sigenv)) {
 343         case OK:
 344             wtuser = 1;
 345             break;
 346
 347         case DONE:
 348             wtuser = 0;
 349             return 0;
 350
 351         default:
 352             wtuser = 0;
 353             return NOTOK;
 354     }
 355
 356     for (;;) {
 357         switch (c = getchar ()) {
 358             case EOF:
 359                 clearerr (stdin);
 360                 longjmp (sigenv, DONE);
 361
 362             case '\n':
 363                 if (cp[-1] == QUOTE) {
 364                     cp[-1] = c;
 365                     wtuser = 0;
 366                     return 1;
 367                 }
 368                 *cp++ = c;
 369                 *cp = 0;
 370                 wtuser = 0;
 371                 return 0;
 372
 373             default:
 374                 if (cp < buffer + n)
 375                     *cp++ = c;
 376                 *cp = 0;
 377         }
 378     }
 379 }
 380
 381
 382 static void
 383 intrser (int i)
 384 {
 385     NMH_UNUSED (i);
 386
 387     if (wtuser)
 388         longjmp (sigenv, NOTOK);
 389     sigint++;
 390 }
 391
 392
 393 static int
 394 chrcnv (char *cp)
 395 {
 396     return (*cp != QUOTE ? *cp : m_atoi (++cp));
 397 }
 398
 399
 400 static void
 401 chrdsp (char *s, char c)
 402 {
 403     printf ("%s ", s);
 404     if (c < ' ' || c == 0177)
 405         printf ("^%c", c ^ 0100);
 406     else
 407         printf ("%c", c);
 408 }