ex.c

   1 #include <ctype.h>
   2 #include <fcntl.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <sys/stat.h>
   7 #include <unistd.h>
   8 #include "vi.h"
   9
  10 int xrow, xoff, xtop;           /* current row, column, and top row */
  11 int xleft;                      /* the first visible column */
  12 int xquit;                      /* exit if set */
  13 int xvis;                       /* visual mode */
  14 int xai = 1;                    /* autoindent option */
  15 int xic = 1;                    /* ignorecase option */
  16 int xaw;                        /* autowrite option */
  17 int xhl = 1;                    /* syntax highlight option */
  18 int xled = 1;                   /* use the line editor */
  19 int xtd = +1;                   /* current text direction */
  20 int xshape = 1;                 /* perform letter shaping */
  21 int xorder = 1;                 /* change the order of characters */
  22 int xkmap = 0;                  /* the current keymap */
  23 int xkmap_alt = 1;              /* the alternate keymap */
  24 static char xkwd[EXLEN];        /* the last searched keyword */
  25 static char xrep[EXLEN];        /* the last replacement */
  26 static int xkwddir;             /* the last search direction */
  27 static int xgdep;               /* global command recursion depth */
  28
  29 static struct buf {
  30         char ft[32];
  31         char *path;
  32         struct lbuf *lb;
  33         int row, off, top;
  34         long mtime;             /* modification time */
  35 } bufs[8];
  36
  37 static int bufs_find(char *path)
  38 {
  39         int i;
  40         for (i = 0; i < LEN(bufs); i++)
  41                 if (bufs[i].lb && !strcmp(bufs[i].path, path))
  42                         return i;
  43         return -1;
  44 }
  45
  46 static void bufs_free(int idx)
  47 {
  48         if (bufs[idx].lb) {
  49                 free(bufs[idx].path);
  50                 lbuf_free(bufs[idx].lb);
  51                 memset(&bufs[idx], 0, sizeof(bufs[idx]));
  52         }
  53 }
  54
  55 static long mtime(char *path)
  56 {
  57         struct stat st;
  58         if (!stat(path, &st))
  59                 return st.st_mtime;
  60         return -1;
  61 }
  62
  63 static int bufs_open(char *path)
  64 {
  65         int i;
  66         for (i = 0; i < LEN(bufs) - 1; i++)
  67                 if (!bufs[i].lb)
  68                         break;
  69         bufs_free(i);
  70         bufs[i].path = uc_dup(path);
  71         bufs[i].lb = lbuf_make();
  72         bufs[i].row = 0;
  73         bufs[i].off = 0;
  74         bufs[i].top = 0;
  75         bufs[i].mtime = -1;
  76         strcpy(bufs[i].ft, syn_filetype(path));
  77         return i;
  78 }
  79
  80 static void bufs_swap(int i, int j)
  81 {
  82         struct buf tmp;
  83         if (i == j)
  84                 return;
  85         memcpy(&tmp, &bufs[i], sizeof(tmp));
  86         memcpy(&bufs[i], &bufs[j], sizeof(tmp));
  87         memcpy(&bufs[j], &tmp, sizeof(tmp));
  88 }
  89
  90 static void bufs_switch(int idx)
  91 {
  92         if (idx > 1)
  93                 bufs_swap(0, 1);
  94         bufs_swap(0, idx);
  95         xrow = bufs[0].row;
  96         xoff = bufs[0].off;
  97         xtop = bufs[0].top;
  98 }
  99
 100 char *ex_path(void)
 101 {
 102         return bufs[0].path;
 103 }
 104
 105 struct lbuf *ex_lbuf(void)
 106 {
 107         return bufs[0].lb;
 108 }
 109
 110 char *ex_filetype(void)
 111 {
 112         return xhl ? bufs[0].ft : "";
 113 }
 114
 115 /* read ex command location */
 116 static char *ex_loc(char *s, char *loc)
 117 {
 118         while (*s == ':' || isspace((unsigned char) *s))
 119                 s++;
 120         while (*s && !isalpha((unsigned char) *s) && *s != '=' && *s != '!') {
 121                 if (*s == '\'')
 122                         *loc++ = *s++;
 123                 if (*s == '/' || *s == '?') {
 124                         int d = *s;
 125                         *loc++ = *s++;
 126                         while (*s && *s != d) {
 127                                 if (*s == '\\' && s[1])
 128                                         *loc++ = *s++;
 129                                 *loc++ = *s++;
 130                         }
 131                 }
 132                 if (*s)
 133                         *loc++ = *s++;
 134         }
 135         *loc = '\0';
 136         return s;
 137 }
 138
 139 /* read ex command name */
 140 static char *ex_cmd(char *s, char *cmd)
 141 {
 142         char *cmd0 = cmd;
 143         s = ex_loc(s, cmd);
 144         while (isspace((unsigned char) *s))
 145                 s++;
 146         while (isalpha((unsigned char) *s))
 147                 if ((*cmd++ = *s++) == 'k' && cmd == cmd0 + 1)
 148                         break;
 149         if (*s == '!' || *s == '=')
 150                 *cmd++ = *s++;
 151         *cmd = '\0';
 152         return s;
 153 }
 154
 155 /* read ex command argument */
 156 static char *ex_arg(char *s, char *arg)
 157 {
 158         s = ex_cmd(s, arg);
 159         while (isspace((unsigned char) *s))
 160                 s++;
 161         while (*s && !isspace((unsigned char) *s)) {
 162                 if (*s == '\\' && s[1])
 163                         s++;
 164                 *arg++ = *s++;
 165         }
 166         *arg = '\0';
 167         return s;
 168 }
 169
 170 static char *ex_argeol(char *ec)
 171 {
 172         char arg[EXLEN];
 173         char *s = ex_cmd(ec, arg);
 174         while (isspace((unsigned char) *s))
 175                 s++;
 176         return s;
 177 }
 178
 179 /* the previous search keyword */
 180 int ex_kwd(char **kwd, int *dir)
 181 {
 182         if (kwd)
 183                 *kwd = xkwd;
 184         if (dir)
 185                 *dir = xkwddir;
 186         return xkwddir == 0;
 187 }
 188
 189 /* set the previous search keyword */
 190 void ex_kwdset(char *kwd, int dir)
 191 {
 192         if (kwd) {
 193                 snprintf(xkwd, sizeof(xkwd), "%s", kwd);
 194                 reg_put('/', kwd, 0);
 195         }
 196         xkwddir = dir;
 197 }
 198
 199 static int ex_search(char **pat)
 200 {
 201         struct sbuf *kw;
 202         char *b = *pat;
 203         char *e = b;
 204         char *pats[1];
 205         struct rset *re;
 206         int dir, row;
 207         kw = sbuf_make();
 208         while (*++e) {
 209                 if (*e == **pat)
 210                         break;
 211                 sbuf_chr(kw, (unsigned char) *e);
 212                 if (*e == '\\' && e[1])
 213                         e++;
 214         }
 215         if (sbuf_len(kw))
 216                 ex_kwdset(sbuf_buf(kw), **pat == '/' ? 1 : -1);
 217         sbuf_free(kw);
 218         *pat = *e ? e + 1 : e;
 219         if (ex_kwd(&pats[0], &dir))
 220                 return -1;
 221         re = rset_make(1, pats, xic ? RE_ICASE : 0);
 222         if (!re)
 223                 return -1;
 224         row = xrow + dir;
 225         while (row >= 0 && row < lbuf_len(xb)) {
 226                 if (rset_find(re, lbuf_get(xb, row), 0, NULL, 0) >= 0)
 227                         break;
 228                 row += dir;
 229         }
 230         rset_free(re);
 231         return row >= 0 && row < lbuf_len(xb) ? row : -1;
 232 }
 233
 234 static int ex_lineno(char **num)
 235 {
 236         int n = xrow;
 237         switch ((unsigned char) **num) {
 238         case '.':
 239                 *num += 1;
 240                 break;
 241         case '$':
 242                 n = lbuf_len(xb) - 1;
 243                 *num += 1;
 244                 break;
 245         case '\'':
 246                 if (lbuf_jump(xb, (unsigned char) *++(*num), &n, NULL))
 247                         return -1;
 248                 *num += 1;
 249                 break;
 250         case '/':
 251         case '?':
 252                 n = ex_search(num);
 253                 break;
 254         default:
 255                 if (isdigit((unsigned char) **num)) {
 256                         n = atoi(*num) - 1;
 257                         while (isdigit((unsigned char) **num))
 258                                 *num += 1;
 259                 }
 260         }
 261         while (**num == '-' || **num == '+') {
 262                 n += atoi((*num)++);
 263                 while (isdigit((unsigned char) **num))
 264                         (*num)++;
 265         }
 266         return n;
 267 }
 268
 269 /* parse ex command location */
 270 static int ex_region(char *loc, int *beg, int *end)
 271 {
 272         int naddr = 0;
 273         if (!strcmp("%", loc)) {
 274                 *beg = 0;
 275                 *end = MAX(0, lbuf_len(xb));
 276                 return 0;
 277         }
 278         if (!*loc) {
 279                 *beg = xrow;
 280                 *end = xrow == lbuf_len(xb) ? xrow : xrow + 1;
 281                 return 0;
 282         }
 283         while (*loc) {
 284                 int end0 = *end;
 285                 *end = ex_lineno(&loc) + 1;
 286                 *beg = naddr++ ? end0 - 1 : *end - 1;
 287                 if (!naddr++)
 288                         *beg = *end - 1;
 289                 while (*loc && *loc != ';' && *loc != ',')
 290                         loc++;
 291                 if (!*loc)
 292                         break;
 293                 if (*loc == ';')
 294                         xrow = *end - 1;
 295                 loc++;
 296         }
 297         if (*beg < 0 || *beg >= lbuf_len(xb))
 298                 return 1;
 299         if (*end < *beg || *end > lbuf_len(xb))
 300                 return 1;
 301         return 0;
 302 }
 303
 304 static int ec_write(char *ec);
 305
 306 static int ex_modifiedbuffer(char *msg)
 307 {
 308         if (!lbuf_modified(xb))
 309                 return 0;
 310         if (xaw && ex_path()[0])
 311                 return ec_write("w");
 312         if (msg)
 313                 ex_show(msg);
 314         return 1;
 315 }
 316
 317 static int ec_quit(char *ec)
 318 {
 319         char cmd[EXLEN];
 320         ex_cmd(ec, cmd);
 321         if (!strchr(cmd, '!'))
 322                 if (ex_modifiedbuffer("buffer modified\n"))
 323                         return 1;
 324         xquit = 1;
 325         return 0;
 326 }
 327
 328 static int ex_expand(char *d, char *s)
 329 {
 330         while (*s) {
 331                 int c = (unsigned char) *s++;
 332                 if (c == '%') {
 333                         if (!bufs[0].path || !bufs[0].path[0]) {
 334                                 ex_show("\"%\" is unset\n");
 335                                 return 1;
 336                         }
 337                         strcpy(d, bufs[0].path);
 338                         d = strchr(d, '\0');
 339                         continue;
 340                 }
 341                 if (c == '#') {
 342                         if (!bufs[1].path || !bufs[1].path[0]) {
 343                                 ex_show("\"#\" is unset\n");
 344                                 return 1;
 345                         }
 346                         strcpy(d, bufs[1].path);
 347                         d = strchr(d, '\0');
 348                         continue;
 349                 }
 350                 if (c == '\\' && (*s == '%' || *s == '#'))
 351                         c = *s++;
 352                 *d++ = c;
 353         }
 354         *d = '\0';
 355         return 0;
 356 }
 357
 358 static int ec_edit(char *ec)
 359 {
 360         char msg[128];
 361         char arg[EXLEN], cmd[EXLEN];
 362         char path[EXLEN];
 363         int fd;
 364         ex_cmd(ec, cmd);
 365         ex_arg(ec, arg);
 366         if (!strchr(cmd, '!'))
 367                 if (xb && ex_modifiedbuffer("buffer modified\n"))
 368                         return 1;
 369         if (ex_expand(path, arg))
 370                 return 1;
 371         bufs[0].row = xrow;
 372         bufs[0].off = xoff;
 373         bufs[0].top = xtop;
 374         if (arg[0] && bufs_find(path) >= 0) {
 375                 bufs_switch(bufs_find(path));
 376                 return 0;
 377         }
 378         if (path[0] || !bufs[0].path)
 379                 bufs_switch(bufs_open(path));
 380         fd = open(ex_path(), O_RDONLY);
 381         if (fd >= 0) {
 382                 int rd = lbuf_rd(xb, fd, 0, lbuf_len(xb));
 383                 close(fd);
 384                 snprintf(msg, sizeof(msg), "\"%s\"  %d lines  [r]\n",
 385                                 ex_path(), lbuf_len(xb));
 386                 if (rd)
 387                         ex_show("read failed\n");
 388                 else
 389                         ex_show(msg);
 390         }
 391         lbuf_saved(xb, path[0] != '\0');
 392         bufs[0].mtime = mtime(ex_path());
 393         xrow = MAX(0, MIN(xrow, lbuf_len(xb) - 1));
 394         xoff = 0;
 395         xtop = MAX(0, MIN(xtop, lbuf_len(xb) - 1));
 396         return 0;
 397 }
 398
 399 static int ec_read(char *ec)
 400 {
 401         char arg[EXLEN], loc[EXLEN];
 402         char msg[128];
 403         int beg, end;
 404         char *path;
 405         char *obuf;
 406         int n = lbuf_len(xb);
 407         ex_arg(ec, arg);
 408         ex_loc(ec, loc);
 409         path = arg[0] ? arg : ex_path();
 410         if (ex_region(loc, &beg, &end))
 411                 return 1;
 412         if (arg[0] == '!') {
 413                 int pos = MIN(xrow + 1, lbuf_len(xb));
 414                 if (ex_expand(arg, ex_argeol(ec)))
 415                         return 1;
 416                 obuf = cmd_pipe(arg + 1, NULL, 0, 1);
 417                 if (obuf)
 418                         lbuf_edit(xb, obuf, pos, pos);
 419                 free(obuf);
 420         } else {
 421                 int fd = open(path, O_RDONLY);
 422                 int pos = lbuf_len(xb) ? end : 0;
 423                 if (fd < 0) {
 424                         ex_show("read failed\n");
 425                         return 1;
 426                 }
 427                 if (lbuf_rd(xb, fd, pos, pos)) {
 428                         ex_show("read failed\n");
 429                         close(fd);
 430                         return 1;
 431                 }
 432                 close(fd);
 433         }
 434         xrow = end + lbuf_len(xb) - n - 1;
 435         snprintf(msg, sizeof(msg), "\"%s\"  %d lines  [r]\n",
 436                         path, lbuf_len(xb) - n);
 437         ex_show(msg);
 438         return 0;
 439 }
 440
 441 static int ec_write(char *ec)
 442 {
 443         char cmd[EXLEN], arg[EXLEN], loc[EXLEN];
 444         char msg[128];
 445         char *path;
 446         char *ibuf;
 447         int beg, end;
 448         ex_cmd(ec, cmd);
 449         ex_arg(ec, arg);
 450         ex_loc(ec, loc);
 451         path = arg[0] ? arg : ex_path();
 452         if (cmd[0] == 'x' && !lbuf_modified(xb))
 453                 return ec_quit(cmd);
 454         if (ex_region(loc, &beg, &end))
 455                 return 1;
 456         if (!loc[0]) {
 457                 beg = 0;
 458                 end = lbuf_len(xb);
 459         }
 460         if (arg[0] == '!') {
 461                 if (ex_expand(arg, ex_argeol(ec)))
 462                         return 1;
 463                 ibuf = lbuf_cp(xb, beg, end);
 464                 ex_print(NULL);
 465                 cmd_pipe(arg + 1, ibuf, 1, 0);
 466                 free(ibuf);
 467         } else {
 468                 int fd;
 469                 if (!strchr(cmd, '!') && bufs[0].path &&
 470                                 !strcmp(bufs[0].path, path) &&
 471                                 mtime(bufs[0].path) > bufs[0].mtime) {
 472                         ex_show("write failed: file changed\n");
 473                         return 1;
 474                 }
 475                 if (!strchr(cmd, '!') && arg[0] && mtime(arg) >= 0) {
 476                         ex_show("write failed: file exists\n");
 477                         return 1;
 478                 }
 479                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 480                 if (fd < 0) {
 481                         ex_show("write failed: cannot create file\n");
 482                         return 1;
 483                 }
 484                 if (lbuf_wr(xb, fd, beg, end)) {
 485                         ex_show("write failed\n");
 486                         close(fd);
 487                         return 1;
 488                 }
 489                 close(fd);
 490         }
 491         snprintf(msg, sizeof(msg), "\"%s\"  %d lines  [w]\n",
 492                         path, end - beg);
 493         ex_show(msg);
 494         if (!ex_path()[0]) {
 495                 free(bufs[0].path);
 496                 bufs[0].path = uc_dup(path);
 497         }
 498         if (!strcmp(ex_path(), path))
 499                 lbuf_saved(xb, 0);
 500         if (!strcmp(ex_path(), path))
 501                 bufs[0].mtime = mtime(path);
 502         if (cmd[0] == 'x' || (cmd[0] == 'w' && cmd[1] == 'q'))
 503                 ec_quit(cmd);
 504         return 0;
 505 }
 506
 507 static int ec_insert(char *ec)
 508 {
 509         char arg[EXLEN], cmd[EXLEN], loc[EXLEN];
 510         struct sbuf *sb;
 511         char *s;
 512         int beg, end;
 513         int n;
 514         ex_arg(ec, arg);
 515         ex_cmd(ec, cmd);
 516         ex_loc(ec, loc);
 517         if (ex_region(loc, &beg, &end) && (beg != 0 || end != 0))
 518                 return 1;
 519         sb = sbuf_make();
 520         while ((s = ex_read(""))) {
 521                 if (!strcmp(".", s)) {
 522                         free(s);
 523                         break;
 524                 }
 525                 sbuf_str(sb, s);
 526                 sbuf_chr(sb, '\n');
 527                 free(s);
 528         }
 529         if (cmd[0] == 'a')
 530                 if (beg + 1 <= lbuf_len(xb))
 531                         beg++;
 532         if (cmd[0] != 'c')
 533                 end = beg;
 534         n = lbuf_len(xb);
 535         lbuf_edit(xb, sbuf_buf(sb), beg, end);
 536         xrow = MIN(lbuf_len(xb) - 1, end + lbuf_len(xb) - n - 1);
 537         sbuf_free(sb);
 538         return 0;
 539 }
 540
 541 static int ec_print(char *ec)
 542 {
 543         char cmd[EXLEN], loc[EXLEN];
 544         int beg, end;
 545         int i;
 546         ex_cmd(ec, cmd);
 547         ex_loc(ec, loc);
 548         if (!cmd[0] && !loc[0]) {
 549                 if (xrow >= lbuf_len(xb) - 1)
 550                         return 1;
 551                 xrow = xrow + 1;
 552         }
 553         if (ex_region(loc, &beg, &end))
 554                 return 1;
 555         for (i = beg; i < end; i++)
 556                 ex_print(lbuf_get(xb, i));
 557         xrow = end;
 558         xoff = 0;
 559         return 0;
 560 }
 561
 562 static int ec_null(char *ec)
 563 {
 564         char loc[EXLEN];
 565         int beg, end;
 566         if (!xvis)
 567                 return ec_print(ec);
 568         ex_loc(ec, loc);
 569         if (ex_region(loc, &beg, &end))
 570                 return 1;
 571         xrow = MAX(beg, end - 1);
 572         xoff = 0;
 573         return 0;
 574 }
 575
 576 static void ex_yank(int reg, int beg, int end)
 577 {
 578         char *buf = lbuf_cp(xb, beg, end);
 579         reg_put(reg, buf, 1);
 580         free(buf);
 581 }
 582
 583 static int ec_delete(char *ec)
 584 {
 585         char loc[EXLEN];
 586         char arg[EXLEN];
 587         int beg, end;
 588         ex_loc(ec, loc);
 589         ex_arg(ec, arg);
 590         if (ex_region(loc, &beg, &end) || !lbuf_len(xb))
 591                 return 1;
 592         ex_yank(arg[0], beg, end);
 593         lbuf_edit(xb, NULL, beg, end);
 594         xrow = beg;
 595         return 0;
 596 }
 597
 598 static int ec_yank(char *ec)
 599 {
 600         char loc[EXLEN];
 601         char arg[EXLEN];
 602         int beg, end;
 603         ex_loc(ec, loc);
 604         ex_arg(ec, arg);
 605         if (ex_region(loc, &beg, &end) || !lbuf_len(xb))
 606                 return 1;
 607         ex_yank(arg[0], beg, end);
 608         return 0;
 609 }
 610
 611 static int ec_put(char *ec)
 612 {
 613         char loc[EXLEN];
 614         char arg[EXLEN];
 615         int beg, end;
 616         int lnmode;
 617         char *buf;
 618         int n = lbuf_len(xb);
 619         ex_loc(ec, loc);
 620         ex_arg(ec, arg);
 621         buf = reg_get(arg[0], &lnmode);
 622         if (!buf || ex_region(loc, &beg, &end))
 623                 return 1;
 624         lbuf_edit(xb, buf, end, end);
 625         xrow = MIN(lbuf_len(xb) - 1, end + lbuf_len(xb) - n - 1);
 626         return 0;
 627 }
 628
 629 static int ec_lnum(char *ec)
 630 {
 631         char loc[EXLEN];
 632         char msg[128];
 633         int beg, end;
 634         ex_loc(ec, loc);
 635         if (ex_region(loc, &beg, &end))
 636                 return 1;
 637         sprintf(msg, "%d\n", end);
 638         ex_print(msg);
 639         return 0;
 640 }
 641
 642 static int ec_undo(char *ec)
 643 {
 644         return lbuf_undo(xb);
 645 }
 646
 647 static int ec_redo(char *ec)
 648 {
 649         return lbuf_redo(xb);
 650 }
 651
 652 static int ec_mark(char *ec)
 653 {
 654         char loc[EXLEN], arg[EXLEN];
 655         int beg, end;
 656         ex_arg(ec, arg);
 657         ex_loc(ec, loc);
 658         if (ex_region(loc, &beg, &end))
 659                 return 1;
 660         lbuf_mark(xb, arg[0], end - 1, 0);
 661         return 0;
 662 }
 663
 664 static void replace(struct sbuf *dst, char *rep, char *ln, int *offs)
 665 {
 666         while (rep[0]) {
 667                 if (rep[0] == '\\' && rep[1]) {
 668                         if (rep[1] >= '0' && rep[1] <= '9') {
 669                                 int grp = (rep[1] - '0') * 2;
 670                                 int len = offs[grp + 1] - offs[grp];
 671                                 sbuf_mem(dst, ln + offs[grp], len);
 672                         } else {
 673                                 sbuf_chr(dst, (unsigned char) rep[1]);
 674                         }
 675                         rep++;
 676                 } else {
 677                         sbuf_chr(dst, (unsigned char) rep[0]);
 678                 }
 679                 rep++;
 680         }
 681 }
 682
 683 static int ec_substitute(char *ec)
 684 {
 685         char loc[EXLEN];
 686         struct rset *re;
 687         int offs[32];
 688         int beg, end;
 689         char *pats[1];
 690         char *pat = NULL, *rep = NULL;
 691         char *s;
 692         int i;
 693         ex_loc(ec, loc);
 694         if (ex_region(loc, &beg, &end))
 695                 return 1;
 696         s = ex_argeol(ec);
 697         pat = re_read(&s);
 698         if (pat && pat[0])
 699                 ex_kwdset(pat, +1);
 700         if (pat && *s) {
 701                 s--;
 702                 rep = re_read(&s);
 703         }
 704         if (!rep)
 705                 rep = uc_dup(pat ? "" : xrep);
 706         snprintf(xrep, sizeof(xrep), "%s", rep);
 707         free(pat);
 708         if (ex_kwd(&pats[0], NULL))
 709                 return 1;
 710         re = rset_make(1, pats, xic ? RE_ICASE : 0);
 711         if (!re) {
 712                 free(rep);
 713                 return 1;
 714         }
 715         for (i = beg; i < end; i++) {
 716                 char *ln = lbuf_get(xb, i);
 717                 struct sbuf *r = sbuf_make();
 718                 while (rset_find(re, ln, LEN(offs) / 2, offs, 0) >= 0) {
 719                         sbuf_mem(r, ln, offs[0]);
 720                         replace(r, rep, ln, offs);
 721                         ln += offs[1];
 722                         if (offs[1] <= 0)
 723                                 sbuf_chr(r, (unsigned char) *ln++);
 724                         if (!strchr(s, 'g'))
 725                                 break;
 726                 }
 727                 sbuf_str(r, ln);
 728                 lbuf_edit(xb, sbuf_buf(r), i, i + 1);
 729                 sbuf_free(r);
 730         }
 731         rset_free(re);
 732         free(rep);
 733         return 0;
 734 }
 735
 736 static int ec_exec(char *ec)
 737 {
 738         char arg[EXLEN];
 739         ex_modifiedbuffer(NULL);
 740         if (ex_expand(arg, ex_argeol(ec)))
 741                 return 1;
 742         ex_print(NULL);
 743         if (cmd_exec(arg))
 744                 return 1;
 745         return 0;
 746 }
 747
 748 static int ec_make(char *ec)
 749 {
 750         char arg[EXLEN];
 751         char make[EXLEN];
 752         ex_modifiedbuffer(NULL);
 753         if (ex_expand(arg, ex_argeol(ec)))
 754                 return 1;
 755         sprintf(make, "make %s", arg);
 756         ex_print(NULL);
 757         if (cmd_exec(make))
 758                 return 1;
 759         return 0;
 760 }
 761
 762 static int ec_ft(char *ec)
 763 {
 764         char arg[EXLEN];
 765         ex_arg(ec, arg);
 766         if (arg[0])
 767                 snprintf(bufs[0].ft, sizeof(bufs[0].ft), "%s", arg);
 768         else
 769                 ex_print(ex_filetype());
 770         return 0;
 771 }
 772
 773 static int ec_cmap(char *ec)
 774 {
 775         char cmd[EXLEN];
 776         char arg[EXLEN];
 777         ex_cmd(ec, cmd);
 778         ex_arg(ec, arg);
 779         if (arg[0])
 780                 xkmap_alt = conf_kmapfind(arg);
 781         else
 782                 ex_print(conf_kmap(xkmap)[0]);
 783         if (arg[0] && !strchr(cmd, '!'))
 784                 xkmap = xkmap_alt;
 785         return 0;
 786 }
 787
 788 static int ex_exec(char *ln);
 789
 790 static int ec_glob(char *ec)
 791 {
 792         char loc[EXLEN], cmd[EXLEN];
 793         struct rset *re;
 794         int offs[32];
 795         int beg, end, not;
 796         char *pats[1];
 797         char *pat, *s;
 798         int i;
 799         ex_cmd(ec, cmd);
 800         ex_loc(ec, loc);
 801         if (!loc[0] && !xgdep)
 802                 strcpy(loc, "%");
 803         if (ex_region(loc, &beg, &end))
 804                 return 1;
 805         not = strchr(cmd, '!') || cmd[0] == 'v';
 806         s = ex_argeol(ec);
 807         pat = re_read(&s);
 808         if (pat && pat[0])
 809                 ex_kwdset(pat, +1);
 810         free(pat);
 811         if (ex_kwd(&pats[0], NULL))
 812                 return 1;
 813         if (!(re = rset_make(1, pats, xic ? RE_ICASE : 0)))
 814                 return 1;
 815         xgdep++;
 816         for (i = beg + 1; i < end; i++)
 817                 lbuf_globset(xb, i, xgdep);
 818         i = beg;
 819         while (i < lbuf_len(xb)) {
 820                 char *ln = lbuf_get(xb, i);
 821                 if ((rset_find(re, ln, LEN(offs) / 2, offs, 0) < 0) == not) {
 822                         xrow = i;
 823                         if (ex_exec(s))
 824                                 break;
 825                         i = MIN(i, xrow);
 826                 }
 827                 while (i < lbuf_len(xb) && !lbuf_globget(xb, i, xgdep))
 828                         i++;
 829         }
 830         for (i = 0; i < lbuf_len(xb); i++)
 831                 lbuf_globget(xb, i, xgdep);
 832         xgdep--;
 833         rset_free(re);
 834         return 0;
 835 }
 836
 837 static struct option {
 838         char *abbr;
 839         char *name;
 840         int *var;
 841 } options[] = {
 842         {"ai", "autoindent", &xai},
 843         {"aw", "autowrite", &xaw},
 844         {"ic", "ignorecase", &xic},
 845         {"td", "textdirection", &xtd},
 846         {"shape", "shape", &xshape},
 847         {"order", "xorder", &xorder},
 848         {"hl", "highlight", &xhl},
 849 };
 850
 851 static char *cutword(char *s, char *d)
 852 {
 853         while (isspace(*s))
 854                 s++;
 855         while (*s && !isspace(*s))
 856                 *d++ = *s++;
 857         while (isspace(*s))
 858                 s++;
 859         *d = '\0';
 860         return s;
 861 }
 862
 863 static int ec_set(char *ec)
 864 {
 865         char arg[EXLEN];
 866         char tok[EXLEN];
 867         char opt[EXLEN];
 868         char *s = arg;
 869         int val = 0;
 870         int i;
 871         ex_arg(ec, arg);
 872         if (*s) {
 873                 s = cutword(s, tok);
 874                 if (tok[0] == 'n' && tok[1] == 'o') {
 875                         strcpy(opt, tok + 2);
 876                         val = 0;
 877                 } else {
 878                         char *r = strchr(tok, '=');
 879                         if (r) {
 880                                 *r = '\0';
 881                                 strcpy(opt, tok);
 882                                 val = atoi(r + 1);
 883                         } else {
 884                                 strcpy(opt, tok);
 885                                 val = 1;
 886                         }
 887                 }
 888                 for (i = 0; i < LEN(options); i++) {
 889                         struct option *o = &options[i];
 890                         if (!strcmp(o->abbr, opt) || !strcmp(o->name, opt)) {
 891                                 *o->var = val;
 892                                 return 0;
 893                         }
 894                 }
 895                 ex_show("unknown option");
 896                 return 1;
 897         }
 898         return 0;
 899 }
 900
 901 static struct excmd {
 902         char *abbr;
 903         char *name;
 904         int (*ec)(char *s);
 905 } excmds[] = {
 906         {"p", "print", ec_print},
 907         {"a", "append", ec_insert},
 908         {"i", "insert", ec_insert},
 909         {"d", "delete", ec_delete},
 910         {"c", "change", ec_insert},
 911         {"e", "edit", ec_edit},
 912         {"e!", "edit!", ec_edit},
 913         {"g", "global", ec_glob},
 914         {"g!", "global!", ec_glob},
 915         {"=", "=", ec_lnum},
 916         {"k", "mark", ec_mark},
 917         {"pu", "put", ec_put},
 918         {"q", "quit", ec_quit},
 919         {"q!", "quit!", ec_quit},
 920         {"r", "read", ec_read},
 921         {"v", "vglobal", ec_glob},
 922         {"w", "write", ec_write},
 923         {"w!", "write!", ec_write},
 924         {"wq", "wq", ec_write},
 925         {"wq!", "wq!", ec_write},
 926         {"u", "undo", ec_undo},
 927         {"r", "redo", ec_redo},
 928         {"se", "set", ec_set},
 929         {"s", "substitute", ec_substitute},
 930         {"x", "xit", ec_write},
 931         {"x!", "xit!", ec_write},
 932         {"ya", "yank", ec_yank},
 933         {"!", "!", ec_exec},
 934         {"make", "make", ec_make},
 935         {"ft", "filetype", ec_ft},
 936         {"cm", "cmap", ec_cmap},
 937         {"cm!", "cmap!", ec_cmap},
 938         {"", "", ec_null},
 939 };
 940
 941 /* read an ex command and its arguments from src into dst */
 942 static void ex_line(int (*ec)(char *s), char *dst, char **src)
 943 {
 944         if (!ec || ec != ec_glob) {
 945                 while (**src && **src != '|' && **src != '\n')
 946                         *dst++ = *(*src)++;
 947                 *dst = '\0';
 948                 if (**src)
 949                         (*src)++;
 950         } else {        /* the rest of the line for :g */
 951                 strcpy(dst, *src);
 952                 *src = strchr(*src, '\0');
 953         }
 954 }
 955
 956 /* execute a single ex command */
 957 static int ex_exec(char *ln)
 958 {
 959         char ec[EXLEN];
 960         char cmd[EXLEN];
 961         int i;
 962         int ret = 0;
 963         while (*ln) {
 964                 ex_cmd(ln, cmd);
 965                 for (i = 0; i < LEN(excmds); i++) {
 966                         if (!strcmp(excmds[i].abbr, cmd) ||
 967                                         !strcmp(excmds[i].name, cmd)) {
 968                                 ex_line(excmds[i].ec, ec, &ln);
 969                                 ret = excmds[i].ec(ec);
 970                                 break;
 971                         }
 972                 }
 973                 if (!xvis && !cmd[0])
 974                         ret = ec_print(ec);
 975                 if (i == LEN(excmds))
 976                         ex_line(NULL, ec, &ln);
 977         }
 978         return ret;
 979 }
 980
 981 /* execute a single ex command */
 982 void ex_command(char *ln)
 983 {
 984         ex_exec(ln);
 985         lbuf_modified(xb);
 986         reg_put(':', ln, 0);
 987 }
 988
 989 /* ex main loop */
 990 void ex(void)
 991 {
 992         while (!xquit) {
 993                 char *ln = ex_read(":");
 994                 if (ln)
 995                         ex_command(ln);
 996                 free(ln);
 997         }
 998 }
 999
1000 int ex_init(char **files)
1001 {
1002         char cmd[EXLEN];
1003         char *s = cmd;
1004         char *r = files[0] ? files[0] : "";
1005         *s++ = 'e';
1006         *s++ = ' ';
1007         while (*r && s + 2 < cmd + sizeof(cmd)) {
1008                 if (*r == ' ')
1009                         *s++ = '\\';
1010                 *s++ = *r++;
1011         }
1012         *s = '\0';
1013         if (ec_edit(cmd))
1014                 return 1;
1015         if (getenv("EXINIT"))
1016                 ex_command(getenv("EXINIT"));
1017         return 0;
1018 }
1019
1020 void ex_done(void)
1021 {
1022         int i;
1023         for (i = 0; i < LEN(bufs); i++)
1024                 bufs_free(i);
1025 }