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 <errno.h>
  14 #include <signal.h>
  15 #include <setjmp.h>
  16
  17 #include <termios.h>
  18
  19 #define QUOTE '\\'
  20
  21 #ifndef CKILL
  22 # define CKILL '@'
  23 #endif
  24
  25 #ifndef CERASE
  26 # define CERASE '#'
  27 #endif
  28
  29 static struct swit switches[] = {
  30 #define ERASESW 0
  31     { "erase chr", 0 },
  32 #define KILLSW  1
  33     { "kill chr", 0 },
  34 #define PREPSW  2
  35     { "prepend", 0 },
  36 #define NPREPSW 3
  37     { "noprepend", 0 },
  38 #define RAPDSW  4
  39     { "rapid", 0 },
  40 #define NRAPDSW 5
  41     { "norapid", 0 },
  42 #define BODYSW  6
  43     { "body", -4 },
  44 #define NBODYSW 7
  45     { "nobody", -6 },
  46 #define DOTSW   8
  47     { "doteof", 0 },
  48 #define NDOTSW  9
  49     { "nodoteof", 0 },
  50 #define VERSIONSW 10
  51     { "version", 0 },
  52 #define HELPSW  11
  53     { "help", 0 },
  54     { NULL, 0 }
  55 };
  56
  57
  58 static struct termios tio;
  59 #define ERASE tio.c_cc[VERASE]
  60 #define KILL  tio.c_cc[VKILL]
  61 #define INTR  tio.c_cc[VINTR]
  62
  63 static int wtuser = 0;
  64 static int sigint = 0;
  65 static jmp_buf sigenv;
  66
  67 /*
  68  * prototypes
  69  */
  70 int getln (char *, int);
  71 static int chrcnv (char *);
  72 static void chrdsp (char *, char);
  73 static void intrser (int);
  74
  75
  76 int
  77 main (int argc, char **argv)
  78 {
  79     int body = 1, prepend = 1, rapid = 0;
  80     int doteof = 0, fdi, fdo, i, state;
  81     char *cp, *drft = NULL, *erasep = NULL;
  82     char *killp = NULL, name[NAMESZ], field[BUFSIZ];
  83     char buffer[BUFSIZ], tmpfil[BUFSIZ];
  84     char **arguments, **argp;
  85     FILE *in, *out;
  86     char *tfile = NULL;
  87
  88 #ifdef LOCALE
  89     setlocale(LC_ALL, "");
  90 #endif
  91     invo_name = r1bindex (argv[0], '/');
  92
  93     /* read user profile/context */
  94     context_read();
  95
  96     arguments = getarguments (invo_name, argc, argv, 1);
  97     argp = arguments;
  98
  99     while ((cp = *argp++))
 100         if (*cp == '-') {
 101             switch (smatch (++cp, switches)) {
 102                 case AMBIGSW:
 103                     ambigsw (cp, switches);
 104                     done (1);
 105                 case UNKWNSW:
 106                     adios (NULL, "-%s unknown", cp);
 107
 108                 case HELPSW:
 109                     snprintf (buffer, sizeof(buffer), "%s [switches] file",
 110                         invo_name);
 111                     print_help (buffer, switches, 1);
 112                     done (1);
 113                 case VERSIONSW:
 114                     print_version(invo_name);
 115                     done (1);
 116
 117                 case ERASESW:
 118                     if (!(erasep = *argp++) || *erasep == '-')
 119                         adios (NULL, "missing argument to %s", argp[-2]);
 120                     continue;
 121                 case KILLSW:
 122                     if (!(killp = *argp++) || *killp == '-')
 123                         adios (NULL, "missing argument to %s", argp[-2]);
 124                     continue;
 125
 126                 case PREPSW:
 127                     prepend++;
 128                     continue;
 129                 case NPREPSW:
 130                     prepend = 0;
 131                     continue;
 132
 133                 case RAPDSW:
 134                     rapid++;
 135                     continue;
 136                 case NRAPDSW:
 137                     rapid = 0;
 138                     continue;
 139
 140                 case BODYSW:
 141                     body++;
 142                     continue;
 143                 case NBODYSW:
 144                     body = 0;
 145                     continue;
 146
 147                 case DOTSW:
 148                     doteof++;
 149                     continue;
 150                 case NDOTSW:
 151                     doteof = 0;
 152                     continue;
 153             }
 154         } else {
 155             if (!drft)
 156                 drft = cp;
 157         }
 158
 159     if (!drft)
 160         adios (NULL, "usage: %s [switches] file", invo_name);
 161     if ((in = fopen (drft, "r")) == NULL)
 162         adios (drft, "unable to open");
 163
 164     tfile = m_mktemp2(NULL, invo_name, NULL, &out);
 165     if (tfile == NULL) adios("prompter", "unable to create temporary file");
 166     chmod (tmpfil, 0600);
 167     strncpy (tmpfil, tfile, sizeof(tmpfil));
 168
 169     /*
 170      * Are we changing the kill or erase character?
 171      */
 172     if (killp || erasep) {
 173         cc_t save_erase, save_kill;
 174
 175         /* get the current terminal attributes */
 176         tcgetattr(0, &tio);
 177
 178         /* save original kill, erase character for later */
 179         save_kill = KILL;
 180         save_erase = ERASE;
 181
 182         /* set new kill, erase character in terminal structure */
 183         KILL = killp ? chrcnv (killp) : save_kill;
 184         ERASE = erasep ? chrcnv (erasep) : save_erase;
 185
 186         /* set the new terminal attributes */
 187          tcsetattr(0, TCSADRAIN, &tio);
 188
 189         /* print out new kill erase characters */
 190         chrdsp ("erase", ERASE);
 191         chrdsp (", kill", KILL);
 192         chrdsp (", intr", INTR);
 193         putchar ('\n');
 194         fflush (stdout);
 195
 196         /*
 197          * We set the kill and erase character back to original
 198          * setup in terminal structure so we can easily
 199          * restore it upon exit.
 200          */
 201         KILL = save_kill;
 202         ERASE = save_erase;
 203     }
 204
 205     sigint = 0;
 206     SIGNAL2 (SIGINT, intrser);
 207
 208     /*
 209      * Loop through the lines of the draft skeleton.
 210      */
 211     for (state = FLD;;) {
 212         switch (state = m_getfld (state, name, field, sizeof(field), in)) {
 213             case FLD:
 214             case FLDEOF:
 215             case FLDPLUS:
 216                 /*
 217                  * Check if the value of field contains anything
 218                  * other than space or tab.
 219                  */
 220                 for (cp = field; *cp; cp++)
 221                     if (*cp != ' ' && *cp != '\t')
 222                         break;
 223
 224                 /* If so, just add header line to draft */
 225                 if (*cp++ != '\n' || *cp != 0) {
 226                     printf ("%s:%s", name, field);
 227                     fprintf (out, "%s:%s", name, field);
 228                     while (state == FLDPLUS) {
 229                         state =
 230                             m_getfld (state, name, field, sizeof(field), in);
 231                         printf ("%s", field);
 232                         fprintf (out, "%s", field);
 233                     }
 234                 } else {
 235                     /* Else, get value of header field */
 236                     printf ("%s: ", name);
 237                     fflush (stdout);
 238                     i = getln (field, sizeof(field));
 239                     if (i == -1) {
 240 abort:
 241                         if (killp || erasep) {
 242                             tcsetattr(0, TCSADRAIN, &tio);
 243                         }
 244                         unlink (tmpfil);
 245                         done (1);
 246                     }
 247                     if (i != 0 || (field[0] != '\n' && field[0] != 0)) {
 248                         fprintf (out, "%s:", name);
 249                         do {
 250                             if (field[0] != ' ' && field[0] != '\t')
 251                                 putc (' ', out);
 252                             fprintf (out, "%s", field);
 253                         } while (i == 1
 254                                     && (i = getln (field, sizeof(field))) >= 0);
 255                         if (i == -1)
 256                             goto abort;
 257                     }
 258                 }
 259
 260                 if (state == FLDEOF) {  /* moby hack */
 261                     fprintf (out, "--------\n");
 262                     printf ("--------\n");
 263                     if (!body)
 264                         break;
 265                     goto no_body;
 266                 }
 267                 continue;
 268
 269             case BODY:
 270             case BODYEOF:
 271             case FILEEOF:
 272                 if (!body)
 273                     break;
 274                 fprintf (out, "--------\n");
 275                 if (field[0] == 0 || !prepend)
 276                     printf ("--------\n");
 277                 if (field[0]) {
 278                     if (prepend && body) {
 279                         printf ("\n--------Enter initial text\n\n");
 280                         fflush (stdout);
 281                         for (;;) {
 282                             getln (buffer, sizeof(buffer));
 283                             if (doteof && buffer[0] == '.' && buffer[1] == '\n')
 284                                 break;
 285                             if (buffer[0] == 0)
 286                                 break;
 287                             fprintf (out, "%s", buffer);
 288                         }
 289                     }
 290
 291                     do {
 292                         fprintf (out, "%s", field);
 293                         if (!rapid && !sigint)
 294                             printf ("%s", field);
 295                     } while (state == BODY &&
 296                             (state = m_getfld (state, name, field, sizeof(field), in)));
 297                     if (prepend || !body)
 298                         break;
 299                     else
 300                         printf ("\n--------Enter additional text\n\n");
 301                 }
 302 no_body:
 303                 fflush (stdout);
 304                 for (;;) {
 305                     getln (field, sizeof(field));
 306                     if (doteof && field[0] == '.' && field[1] == '\n')
 307                         break;
 308                     if (field[0] == 0)
 309                         break;
 310                     fprintf (out, "%s", field);
 311                 }
 312                 break;
 313
 314             default:
 315                 adios (NULL, "skeleton is poorly formatted");
 316         }
 317         break;
 318     }
 319
 320     if (body)
 321         printf ("--------\n");
 322
 323     fflush (stdout);
 324     fclose (in);
 325     fclose (out);
 326     SIGNAL (SIGINT, SIG_IGN);
 327
 328     if (killp || erasep) {
 329          tcsetattr(0, TCSADRAIN, &tio);
 330     }
 331
 332     if ((fdi = open (tmpfil, O_RDONLY)) == NOTOK)
 333         adios (tmpfil, "unable to re-open");
 334     if ((fdo = creat (drft, m_gmprot ())) == NOTOK)
 335         adios (drft, "unable to write");
 336     cpydata (fdi, fdo, tmpfil, drft);
 337     close (fdi);
 338     close (fdo);
 339     unlink (tmpfil);
 340
 341     context_save ();    /* save the context file */
 342     done (0);
 343     return 1;
 344 }
 345
 346
 347 int
 348 getln (char *buffer, int n)
 349 {
 350     int c;
 351     char *cp;
 352
 353     cp = buffer;
 354     *cp = 0;
 355
 356     switch (setjmp (sigenv)) {
 357         case OK:
 358             wtuser = 1;
 359             break;
 360
 361         case DONE:
 362             wtuser = 0;
 363             return 0;
 364
 365         default:
 366             wtuser = 0;
 367             return NOTOK;
 368     }
 369
 370     for (;;) {
 371         switch (c = getchar ()) {
 372             case EOF:
 373                 clearerr (stdin);
 374                 longjmp (sigenv, DONE);
 375
 376             case '\n':
 377                 if (cp[-1] == QUOTE) {
 378                     cp[-1] = c;
 379                     wtuser = 0;
 380                     return 1;
 381                 }
 382                 *cp++ = c;
 383                 *cp = 0;
 384                 wtuser = 0;
 385                 return 0;
 386
 387             default:
 388                 if (cp < buffer + n)
 389                     *cp++ = c;
 390                 *cp = 0;
 391         }
 392     }
 393 }
 394
 395
 396 static void
 397 intrser (int i)
 398 {
 399     NMH_UNUSED (i);
 400
 401     if (wtuser)
 402         longjmp (sigenv, NOTOK);
 403     sigint++;
 404 }
 405
 406
 407 static int
 408 chrcnv (char *cp)
 409 {
 410     return (*cp != QUOTE ? *cp : m_atoi (++cp));
 411 }
 412
 413
 414 static void
 415 chrdsp (char *s, char c)
 416 {
 417     printf ("%s ", s);
 418     if (c < ' ' || c == 0177)
 419         printf ("^%c", c ^ 0100);
 420     else
 421         printf ("%c", c);
 422 }