vi.c

   1 /*
   2  * neatvi editor
   3  *
   4  * Copyright (C) 2015 Ali Gholami Rudi <ali at rudi dot ir>
   5  *
   6  * This program is released under the Modified BSD license.
   7  */
   8 #include <ctype.h>
   9 #include <fcntl.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include "vi.h"
  14
  15 char vi_msg[512];               /* current message */
  16 static char vi_findlast[256];   /* the last searched keyword */
  17 static int vi_finddir;          /* the last search direction */
  18 static char vi_charlast[8];     /* the last character searched via f, t, F, or T */
  19 static int vi_charcmd;          /* the character finding command */
  20 static int vi_arg1, vi_arg2;    /* the first and second arguments */
  21 static int vi_ybuf;             /* current yank buffer */
  22 static char *vi_kmap;           /* current insertion keymap */
  23 static int vi_pcol;             /* the column requested by | command */
  24
  25 static void vi_drawmsg(void)
  26 {
  27         led_print(vi_msg, xrows);
  28         vi_msg[0] = '\0';
  29 }
  30
  31 static void vi_draw(int xcol)
  32 {
  33         int i;
  34         term_record();
  35         for (i = xtop; i < xtop + xrows; i++) {
  36                 char *s = lbuf_get(xb, i);
  37                 led_print(s ? s : (i ? "~" : ""), i - xtop);
  38         }
  39         vi_drawmsg();
  40         term_pos(xrow, led_pos(lbuf_get(xb, i), xcol));
  41         term_commit();
  42 }
  43
  44 static int vi_buf[128];
  45 static int vi_buflen;
  46
  47 static int vi_read(void)
  48 {
  49         return vi_buflen ? vi_buf[--vi_buflen] : term_read(1000);
  50 }
  51
  52 static void vi_back(int c)
  53 {
  54         if (vi_buflen < sizeof(vi_buf))
  55                 vi_buf[vi_buflen++] = c;
  56 }
  57
  58 static char *vi_char(void)
  59 {
  60         return led_read(&vi_kmap);
  61 }
  62
  63 static char *vi_prompt(char *msg, char **kmap)
  64 {
  65         term_pos(xrows, led_pos(msg, 0));
  66         term_kill();
  67         return led_prompt(msg, "", kmap);
  68 }
  69
  70 char *ex_read(char *msg)
  71 {
  72         struct sbuf *sb;
  73         char c;
  74         if (xled) {
  75                 char *s = led_prompt(msg, "", &vi_kmap);
  76                 if (s)
  77                         term_chr('\n');
  78                 return s;
  79         }
  80         sb = sbuf_make();
  81         while ((c = getchar()) != EOF && c != '\n')
  82                 sbuf_chr(sb, c);
  83         if (c == EOF) {
  84                 sbuf_free(sb);
  85                 return NULL;
  86         }
  87         return sbuf_done(sb);
  88 }
  89
  90 void ex_show(char *msg)
  91 {
  92         if (xvis) {
  93                 snprintf(vi_msg, sizeof(vi_msg), "%s", msg);
  94         } else if (xled) {
  95                 led_print(msg, -1);
  96                 term_chr('\n');
  97         } else {
  98                 printf("%s", msg);
  99         }
 100 }
 101
 102 static int vi_yankbuf(void)
 103 {
 104         int c = vi_read();
 105         if (c == '"')
 106                 return vi_read();
 107         vi_back(c);
 108         return 0;
 109 }
 110
 111 static int vi_prefix(void)
 112 {
 113         int n = 0;
 114         int c = vi_read();
 115         if ((c >= '1' && c <= '9')) {
 116                 while (isdigit(c)) {
 117                         n = n * 10 + c - '0';
 118                         c = vi_read();
 119                 }
 120         }
 121         vi_back(c);
 122         return n;
 123 }
 124
 125 static int vi_col2off(struct lbuf *lb, int row, int col)
 126 {
 127         char *ln = lbuf_get(lb, row);
 128         return ln ? ren_off(ln, col) : 0;
 129 }
 130
 131 static int vi_off2col(struct lbuf *lb, int row, int off)
 132 {
 133         char *ln = lbuf_get(lb, row);
 134         return ln ? ren_pos(ln, off) : 0;
 135 }
 136
 137 static int vi_nextoff(struct lbuf *lb, int dir, int *row, int *off)
 138 {
 139         int o = *off + dir;
 140         if (o < 0 || !lbuf_get(lb, *row) || o >= uc_slen(lbuf_get(lb, *row)))
 141                 return 1;
 142         *off = o;
 143         return 0;
 144 }
 145
 146 static int vi_nextcol(struct lbuf *lb, int dir, int *row, int *off)
 147 {
 148         char *ln = lbuf_get(lb, *row);
 149         int col = ln ? ren_pos(ln, *off) : 0;
 150         int o = ln ? ren_next(ln, col, dir) : -1;
 151         if (o < 0)
 152                 return -1;
 153         *off = ren_off(ln, o);
 154         return 0;
 155 }
 156
 157 static int vi_findchar(struct lbuf *lb, char *cs, int cmd, int n, int *row, int *off)
 158 {
 159         strcpy(vi_charlast, cs);
 160         vi_charcmd = cmd;
 161         return lbuf_findchar(lb, cs, cmd, n, row, off);
 162 }
 163
 164 static int vi_search(int cmd, int cnt, int *row, int *off)
 165 {
 166         int r = *row;
 167         int o = *off;
 168         int failed = 0;
 169         int len = 0;
 170         int i, dir;
 171         char *soff = "";
 172         if (cmd == '/' || cmd == '?') {
 173                 char sign[4] = {cmd};
 174                 char *kw = vi_prompt(sign, &vi_kmap);
 175                 if (!kw)
 176                         return 1;
 177                 vi_finddir = cmd == '/' ? +1 : -1;
 178                 if (kw[0])
 179                         snprintf(vi_findlast, sizeof(vi_findlast), "%s", kw);
 180                 if (strchr(vi_findlast, cmd)) {
 181                         soff = strchr(vi_findlast, cmd) + 1;
 182                         *strchr(vi_findlast, cmd) = '\0';
 183                 }
 184                 free(kw);
 185         }
 186         dir = cmd == 'N' ? -vi_finddir : vi_finddir;
 187         if (!vi_findlast[0] || !lbuf_len(xb))
 188                 return 1;
 189         o = *off;
 190         for (i = 0; i < cnt; i++) {
 191                 if (lbuf_search(xb, vi_findlast, dir, &r, &o, &len)) {
 192                         failed = 1;
 193                         break;
 194                 }
 195                 if (i + 1 < cnt && cmd == '/')
 196                         o += len;
 197         }
 198         if (!failed) {
 199                 *row = r;
 200                 *off = o;
 201                 while (soff[0] && isspace((unsigned char) soff[0]))
 202                         soff++;
 203                 if (soff[0]) {
 204                         *off = -1;
 205                         if (*row + atoi(soff) < 0 || *row + atoi(soff) >= lbuf_len(xb))
 206                                 failed = 1;
 207                         else
 208                                 *row += atoi(soff);
 209                 }
 210         }
 211         if (failed)
 212                 snprintf(vi_msg, sizeof(vi_msg), "\"%s\" not found\n", vi_findlast);
 213         return failed;
 214 }
 215
 216 /* read a line motion */
 217 static int vi_motionln(int *row, int cmd)
 218 {
 219         int cnt = (vi_arg1 ? vi_arg1 : 1) * (vi_arg2 ? vi_arg2 : 1);
 220         int c = vi_read();
 221         int mark, mark_row, mark_off;
 222         switch (c) {
 223         case '\n':
 224         case '+':
 225                 *row = MIN(*row + cnt, lbuf_len(xb) - 1);
 226                 break;
 227         case '-':
 228                 *row = MAX(*row - cnt, 0);
 229                 break;
 230         case '_':
 231                 *row = MIN(*row + cnt - 1, lbuf_len(xb) - 1);
 232                 break;
 233         case '\'':
 234                 if ((mark = vi_read()) <= 0)
 235                         return -1;
 236                 if (lbuf_jump(xb, mark, &mark_row, &mark_off))
 237                         return -1;
 238                 *row = mark_row;
 239                 break;
 240         case 'j':
 241                 *row = MIN(*row + cnt, lbuf_len(xb) - 1);
 242                 break;
 243         case 'k':
 244                 *row = MAX(*row - cnt, 0);
 245                 break;
 246         case 'G':
 247                 *row = (vi_arg1 || vi_arg2) ? cnt - 1 : lbuf_len(xb) - 1;
 248                 break;
 249         case 'H':
 250                 if (lbuf_len(xb))
 251                         *row = MIN(xtop + cnt - 1, lbuf_len(xb) - 1);
 252                 else
 253                         *row = 0;
 254                 break;
 255         case 'L':
 256                 if (lbuf_len(xb))
 257                         *row = MIN(xtop + xrows - 1 - cnt + 1, lbuf_len(xb) - 1);
 258                 else
 259                         *row = 0;
 260                 break;
 261         case 'M':
 262                 if (lbuf_len(xb))
 263                         *row = MIN(xtop + xrows / 2, lbuf_len(xb) - 1);
 264                 else
 265                         *row = 0;
 266                 break;
 267         default:
 268                 if (c == cmd) {
 269                         *row = MAX(0, MIN(*row + cnt - 1, lbuf_len(xb) - 1));
 270                         break;
 271                 }
 272                 vi_back(c);
 273                 return 0;
 274         }
 275         return c;
 276 }
 277
 278 static char *vi_curword(struct lbuf *lb, int row, int off)
 279 {
 280         struct sbuf *sb;
 281         char *ln = lbuf_get(lb, row);
 282         char *beg, *end;
 283         if (!ln)
 284                 return NULL;
 285         beg = uc_chr(ln, ren_noeol(ln, off));
 286         end = beg;
 287         while (*end && uc_kind(end) == 1)
 288                 end = uc_next(end);
 289         while (beg > ln && uc_kind(uc_beg(ln, beg - 1)) == 1)
 290                 beg = uc_beg(ln, beg - 1);
 291         if (beg >= end)
 292                 return NULL;
 293         sb = sbuf_make();
 294         sbuf_str(sb, "\\<");
 295         sbuf_mem(sb, beg, end - beg);
 296         sbuf_str(sb, "\\>");
 297         return sbuf_done(sb);
 298 }
 299
 300 /* read a motion */
 301 static int vi_motion(int *row, int *off)
 302 {
 303         int cnt = (vi_arg1 ? vi_arg1 : 1) * (vi_arg2 ? vi_arg2 : 1);
 304         char *ln = lbuf_get(xb, *row);
 305         int dir = dir_context(ln ? ln : "");
 306         int mark, mark_row, mark_off;
 307         char *cs;
 308         int mv;
 309         int i;
 310         if ((mv = vi_motionln(row, 0))) {
 311                 *off = -1;
 312                 return mv;
 313         }
 314         mv = vi_read();
 315         switch (mv) {
 316         case 'f':
 317                 if (!(cs = vi_char()))
 318                         return -1;
 319                 if (vi_findchar(xb, cs, mv, cnt, row, off))
 320                         return -1;
 321                 break;
 322         case 'F':
 323                 if (!(cs = vi_char()))
 324                         return -1;
 325                 if (vi_findchar(xb, cs, mv, cnt, row, off))
 326                         return -1;
 327                 break;
 328         case ';':
 329                 if (!vi_charlast[0])
 330                         return -1;
 331                 if (vi_findchar(xb, vi_charlast, vi_charcmd, cnt, row, off))
 332                         return -1;
 333                 break;
 334         case ',':
 335                 if (!vi_charlast[0])
 336                         return -1;
 337                 if (vi_findchar(xb, vi_charlast, vi_charcmd, -cnt, row, off))
 338                         return -1;
 339                 break;
 340         case 'h':
 341                 for (i = 0; i < cnt; i++)
 342                         if (vi_nextcol(xb, -1 * dir, row, off))
 343                                 break;
 344                 break;
 345         case 'l':
 346                 for (i = 0; i < cnt; i++)
 347                         if (vi_nextcol(xb, +1 * dir, row, off))
 348                                 break;
 349                 break;
 350         case 't':
 351                 if (!(cs = vi_char()))
 352                         return -1;
 353                 if (vi_findchar(xb, cs, mv, cnt, row, off))
 354                         return -1;
 355                 break;
 356         case 'T':
 357                 if (!(cs = vi_char()))
 358                         return -1;
 359                 if (vi_findchar(xb, cs, mv, cnt, row, off))
 360                         return -1;
 361                 break;
 362         case 'B':
 363                 for (i = 0; i < cnt; i++)
 364                         if (lbuf_wordend(xb, 1, -1, row, off))
 365                                 break;
 366                 break;
 367         case 'E':
 368                 for (i = 0; i < cnt; i++)
 369                         if (lbuf_wordend(xb, 1, +1, row, off))
 370                                 break;
 371                 break;
 372         case 'W':
 373                 for (i = 0; i < cnt; i++)
 374                         if (lbuf_wordbeg(xb, 1, +1, row, off))
 375                                 break;
 376                 break;
 377         case 'b':
 378                 for (i = 0; i < cnt; i++)
 379                         if (lbuf_wordend(xb, 0, -1, row, off))
 380                                 break;
 381                 break;
 382         case 'e':
 383                 for (i = 0; i < cnt; i++)
 384                         if (lbuf_wordend(xb, 0, +1, row, off))
 385                                 break;
 386                 break;
 387         case 'w':
 388                 for (i = 0; i < cnt; i++)
 389                         if (lbuf_wordbeg(xb, 0, +1, row, off))
 390                                 break;
 391                 break;
 392         case '{':
 393                 for (i = 0; i < cnt; i++)
 394                         if (lbuf_paragraphbeg(xb, -1, row, off))
 395                                 break;
 396                 break;
 397         case '}':
 398                 for (i = 0; i < cnt; i++)
 399                         if (lbuf_paragraphbeg(xb, +1, row, off))
 400                                 break;
 401                 break;
 402         case '[':
 403                 if (vi_read() != '[')
 404                         return -1;
 405                 for (i = 0; i < cnt; i++)
 406                         if (lbuf_sectionbeg(xb, -1, row, off))
 407                                 break;
 408                 break;
 409         case ']':
 410                 if (vi_read() != ']')
 411                         return -1;
 412                 for (i = 0; i < cnt; i++)
 413                         if (lbuf_sectionbeg(xb, +1, row, off))
 414                                 break;
 415                 break;
 416         case '0':
 417                 *off = 0;
 418                 break;
 419         case '^':
 420                 *off = lbuf_indents(xb, *row);
 421                 break;
 422         case '$':
 423                 *off = lbuf_eol(xb, *row);
 424                 break;
 425         case '|':
 426                 *off = vi_col2off(xb, *row, cnt - 1);
 427                 vi_pcol = cnt - 1;
 428                 break;
 429         case '/':
 430                 if (vi_search(mv, cnt, row, off))
 431                         return -1;
 432                 break;
 433         case '?':
 434                 if (vi_search(mv, cnt, row, off))
 435                         return -1;
 436                 break;
 437         case 'n':
 438                 if (vi_search(mv, cnt, row, off))
 439                         return -1;
 440                 break;
 441         case 'N':
 442                 if (vi_search(mv, cnt, row, off))
 443                         return -1;
 444                 break;
 445         case TK_CTL('a'):
 446                 if (!(cs = vi_curword(xb, *row, *off)))
 447                         return -1;
 448                 strcpy(vi_findlast, cs);
 449                 free(cs);
 450                 vi_finddir = +1;
 451                 if (vi_search('n', cnt, row, off))
 452                         return -1;
 453                 break;
 454         case ' ':
 455                 for (i = 0; i < cnt; i++)
 456                         if (vi_nextoff(xb, +1, row, off))
 457                                 break;
 458                 break;
 459         case 127:
 460         case TK_CTL('h'):
 461                 for (i = 0; i < cnt; i++)
 462                         if (vi_nextoff(xb, -1, row, off))
 463                                 break;
 464                 break;
 465         case '`':
 466                 if ((mark = vi_read()) <= 0)
 467                         return -1;
 468                 if (lbuf_jump(xb, mark, &mark_row, &mark_off))
 469                         return -1;
 470                 *row = mark_row;
 471                 *off = mark_off;
 472                 break;
 473         default:
 474                 vi_back(mv);
 475                 return 0;
 476         }
 477         return mv;
 478 }
 479
 480 static void swap(int *a, int *b)
 481 {
 482         int t = *a;
 483         *a = *b;
 484         *b = t;
 485 }
 486
 487 static char *lbuf_region(struct lbuf *lb, int r1, int o1, int r2, int o2)
 488 {
 489         struct sbuf *sb;
 490         char *s1, *s2, *s3;
 491         if (r1 == r2)
 492                 return uc_sub(lbuf_get(lb, r1), o1, o2);
 493         sb = sbuf_make();
 494         s1 = uc_sub(lbuf_get(lb, r1), o1, -1);
 495         s3 = uc_sub(lbuf_get(lb, r2), 0, o2);
 496         s2 = lbuf_cp(lb, r1 + 1, r2);
 497         sbuf_str(sb, s1);
 498         sbuf_str(sb, s2);
 499         sbuf_str(sb, s3);
 500         free(s1);
 501         free(s2);
 502         free(s3);
 503         return sbuf_done(sb);
 504 }
 505
 506 static void vi_yank(int r1, int o1, int r2, int o2, int lnmode)
 507 {
 508         char *region;
 509         region = lbuf_region(xb, r1, lnmode ? 0 : o1, r2, lnmode ? -1 : o2);
 510         reg_put(vi_ybuf, region, lnmode);
 511         free(region);
 512         xrow = r1;
 513         xoff = lnmode ? xoff : o1;
 514 }
 515
 516 static void vi_delete(int r1, int o1, int r2, int o2, int lnmode)
 517 {
 518         char *pref, *post;
 519         char *region;
 520         region = lbuf_region(xb, r1, lnmode ? 0 : o1, r2, lnmode ? -1 : o2);
 521         reg_put(vi_ybuf, region, lnmode);
 522         free(region);
 523         pref = lnmode ? uc_dup("") : uc_sub(lbuf_get(xb, r1), 0, o1);
 524         post = lnmode ? uc_dup("\n") : uc_sub(lbuf_get(xb, r2), o2, -1);
 525         lbuf_rm(xb, r1, r2 + 1);
 526         if (!lnmode) {
 527                 struct sbuf *sb = sbuf_make();
 528                 sbuf_str(sb, pref);
 529                 sbuf_str(sb, post);
 530                 lbuf_put(xb, r1, sbuf_buf(sb));
 531                 sbuf_free(sb);
 532         }
 533         xrow = r1;
 534         xoff = lnmode ? lbuf_indents(xb, xrow) : o1;
 535         free(pref);
 536         free(post);
 537 }
 538
 539 static int linecount(char *s)
 540 {
 541         int n;
 542         for (n = 0; s; n++)
 543                 if ((s = strchr(s, '\n')))
 544                         s++;
 545         return n;
 546 }
 547
 548 static int indentscopy(char *d, char *s, int len)
 549 {
 550         int i;
 551         for (i = 0; i < len - 1 && (s[i] == ' ' || s[i] == '\t'); i++)
 552                 d[i] = s[i];
 553         d[i] = '\0';
 554         return i;
 555 }
 556
 557 static char *vi_input(char *pref, char *post, int *row, int *off)
 558 {
 559         char ai[64] = "";
 560         char *rep, *s;
 561         struct sbuf *sb;
 562         int last;
 563         if (xai)
 564                 pref += indentscopy(ai, pref, sizeof(ai));
 565         rep = led_input(pref, post, ai, xai ? sizeof(ai) - 1 : 0, &vi_kmap);
 566         if (!rep)
 567                 return NULL;
 568         sb = sbuf_make();
 569         sbuf_str(sb, ai);
 570         sbuf_str(sb, pref);
 571         sbuf_str(sb, rep);
 572         s = sbuf_buf(sb);
 573         last = uc_lastline(s) - s;
 574         *off = MAX(0, uc_slen(sbuf_buf(sb) + last) - 1);
 575         if (last)
 576                 while (xai && (post[0] == ' ' || post[0] == '\t'))
 577                         post++;
 578         sbuf_str(sb, post);
 579         *row = linecount(sbuf_buf(sb)) - 1;
 580         free(rep);
 581         return sbuf_done(sb);
 582 }
 583
 584 static char *vi_indents(char *ln)
 585 {
 586         struct sbuf *sb = sbuf_make();
 587         while (xai && ln && (*ln == ' ' || *ln == '\t'))
 588                 sbuf_chr(sb, *ln++);
 589         return sbuf_done(sb);
 590 }
 591
 592 static void vi_change(int r1, int o1, int r2, int o2, int lnmode)
 593 {
 594         char *region;
 595         int row, off;
 596         char *rep;
 597         char *pref, *post;
 598         region = lbuf_region(xb, r1, lnmode ? 0 : o1, r2, lnmode ? -1 : o2);
 599         reg_put(vi_ybuf, region, lnmode);
 600         free(region);
 601         pref = lnmode ? vi_indents(lbuf_get(xb, r1)) : uc_sub(lbuf_get(xb, r1), 0, o1);
 602         post = lnmode ? uc_dup("\n") : uc_sub(lbuf_get(xb, r2), o2, -1);
 603         rep = vi_input(pref, post, &row, &off);
 604         if (rep) {
 605                 lbuf_rm(xb, r1, r2 + 1);
 606                 lbuf_put(xb, r1, rep);
 607                 xrow = r1 + row - 1;
 608                 xoff = off;
 609                 free(rep);
 610         }
 611         free(pref);
 612         free(post);
 613 }
 614
 615 static void vi_case(int r1, int o1, int r2, int o2, int lnmode, int cmd)
 616 {
 617         char *pref, *post;
 618         char *region, *s;
 619         region = lbuf_region(xb, r1, lnmode ? 0 : o1, r2, lnmode ? -1 : o2);
 620         s = region;
 621         while (*s) {
 622                 int c = (unsigned char) s[0];
 623                 if (c <= 0x7f) {
 624                         if (cmd == 'u')
 625                                 s[0] = tolower(c);
 626                         if (cmd == 'U')
 627                                 s[0] = toupper(c);
 628                         if (cmd == '~')
 629                                 s[0] = islower(c) ? toupper(c) : tolower(c);
 630                 }
 631                 s = uc_next(s);
 632         }
 633         pref = lnmode ? uc_dup("") : uc_sub(lbuf_get(xb, r1), 0, o1);
 634         post = lnmode ? uc_dup("\n") : uc_sub(lbuf_get(xb, r2), o2, -1);
 635         lbuf_rm(xb, r1, r2 + 1);
 636         if (!lnmode) {
 637                 struct sbuf *sb = sbuf_make();
 638                 sbuf_str(sb, pref);
 639                 sbuf_str(sb, region);
 640                 sbuf_str(sb, post);
 641                 lbuf_put(xb, r1, sbuf_buf(sb));
 642                 sbuf_free(sb);
 643         } else {
 644                 lbuf_put(xb, r1, region);
 645         }
 646         xrow = r2;
 647         xoff = lnmode ? lbuf_indents(xb, r2) : o2;
 648         free(region);
 649         free(pref);
 650         free(post);
 651 }
 652
 653 static void vi_pipe(int r1, int r2)
 654 {
 655         char *text;
 656         char *rep;
 657         char *kmap = NULL;
 658         char *cmd = vi_prompt("!", &kmap);
 659         if (!cmd)
 660                 return;
 661         text = lbuf_cp(xb, r1, r2 + 1);
 662         rep = cmd_pipe(cmd, text);
 663         if (rep) {
 664                 lbuf_rm(xb, r1, r2 + 1);
 665                 lbuf_put(xb, r1, rep);
 666         }
 667         free(cmd);
 668         free(text);
 669         free(rep);
 670 }
 671
 672 static void vi_shift(int r1, int r2, int dir)
 673 {
 674         struct sbuf *sb;
 675         char *ln;
 676         int i;
 677         for (i = r1; i <= r2; i++) {
 678                 if (!(ln = lbuf_get(xb, i)))
 679                         continue;
 680                 sb = sbuf_make();
 681                 if (dir > 0)
 682                         sbuf_chr(sb, '\t');
 683                 else
 684                         ln = ln[0] == ' ' || ln[0] == '\t' ? ln + 1 : ln;
 685                 sbuf_str(sb, ln);
 686                 lbuf_rm(xb, i, i + 1);
 687                 lbuf_put(xb, i, sbuf_buf(sb));
 688                 sbuf_free(sb);
 689         }
 690         xrow = r1;
 691         xoff = lbuf_indents(xb, xrow);
 692 }
 693
 694 static int vc_motion(int cmd)
 695 {
 696         int r1 = xrow, r2 = xrow;       /* region rows */
 697         int o1 = xoff, o2 = xoff;       /* visual region columns */
 698         int lnmode = 0;                 /* line-based region */
 699         int mv;
 700         vi_arg2 = vi_prefix();
 701         if (vi_arg2 < 0)
 702                 return 1;
 703         o1 = ren_noeol(lbuf_get(xb, r1), o1);
 704         o2 = o1;
 705         if ((mv = vi_motionln(&r2, cmd))) {
 706                 o2 = -1;
 707         } else if (!(mv = vi_motion(&r2, &o2))) {
 708                 vi_read();
 709                 return 1;
 710         }
 711         if (mv < 0)
 712                 return 1;
 713         lnmode = o2 < 0;
 714         if (lnmode) {
 715                 o1 = 0;
 716                 o2 = lbuf_eol(xb, r2);
 717         }
 718         if (r1 > r2) {
 719                 swap(&r1, &r2);
 720                 swap(&o1, &o2);
 721         }
 722         if (r1 == r2 && o1 > o2)
 723                 swap(&o1, &o2);
 724         o1 = ren_noeol(lbuf_get(xb, r1), o1);
 725         if (!lnmode && strchr("fFtTeE", mv))
 726                 if (o2 < lbuf_eol(xb, r2))
 727                         o2 = ren_noeol(lbuf_get(xb, r2), o2) + 1;
 728         if (cmd == 'y')
 729                 vi_yank(r1, o1, r2, o2, lnmode);
 730         if (cmd == 'd')
 731                 vi_delete(r1, o1, r2, o2, lnmode);
 732         if (cmd == 'c')
 733                 vi_change(r1, o1, r2, o2, lnmode);
 734         if (cmd == '~' || cmd == 'u' || cmd == 'U')
 735                 vi_case(r1, o1, r2, o2, lnmode, cmd);
 736         if (cmd == '!')
 737                 vi_pipe(r1, r2);
 738         if (cmd == '>' || cmd == '<')
 739                 vi_shift(r1, r2, cmd == '>' ? +1 : -1);
 740         return 0;
 741 }
 742
 743 static int vc_insert(int cmd)
 744 {
 745         char *pref, *post;
 746         char *ln = lbuf_get(xb, xrow);
 747         int row, off = 0;
 748         char *rep;
 749         if (cmd == 'I')
 750                 xoff = lbuf_indents(xb, xrow);
 751         if (cmd == 'A')
 752                 xoff = lbuf_eol(xb, xrow);
 753         xoff = ren_noeol(ln, xoff);
 754         if (cmd == 'o')
 755                 xrow += 1;
 756         if (cmd == 'i' || cmd == 'I')
 757                 off = xoff;
 758         if (cmd == 'a' || cmd == 'A')
 759                 off = xoff + 1;
 760         pref = ln && cmd != 'o' && cmd != 'O' ? uc_sub(ln, 0, off) : vi_indents(ln);
 761         post = ln && cmd != 'o' && cmd != 'O' ? uc_sub(ln, off, -1) : uc_dup("\n");
 762         rep = vi_input(pref, post, &row, &off);
 763         if ((cmd == 'o' || cmd == 'O') && !lbuf_len(xb))
 764                 lbuf_put(xb, 0, "\n");
 765         if (rep) {
 766                 if (cmd != 'o' && cmd != 'O')
 767                         lbuf_rm(xb, xrow, xrow + 1);
 768                 lbuf_put(xb, xrow, rep);
 769                 xrow += row - 1;
 770                 xoff = off;
 771                 free(rep);
 772         }
 773         free(pref);
 774         free(post);
 775         return !rep;
 776 }
 777
 778 static int vc_put(int cmd)
 779 {
 780         int cnt = MAX(1, vi_arg1);
 781         int lnmode;
 782         char *buf = reg_get(vi_ybuf, &lnmode);
 783         int i;
 784         if (!buf)
 785                 return 1;
 786         if (lnmode) {
 787                 struct sbuf *sb = sbuf_make();
 788                 for (i = 0; i < cnt; i++)
 789                         sbuf_str(sb, buf);
 790                 if (!lbuf_len(xb))
 791                         lbuf_put(xb, 0, "\n");
 792                 if (cmd == 'p')
 793                         xrow++;
 794                 lbuf_put(xb, xrow, sbuf_buf(sb));
 795                 xoff = lbuf_indents(xb, xrow);
 796                 sbuf_free(sb);
 797         } else {
 798                 struct sbuf *sb = sbuf_make();
 799                 char *ln = xrow < lbuf_len(xb) ? lbuf_get(xb, xrow) : "\n";
 800                 int off = ren_noeol(ln, xoff) + (ln[0] != '\n' && cmd == 'p');
 801                 char *s = uc_sub(ln, 0, off);
 802                 sbuf_str(sb, s);
 803                 free(s);
 804                 for (i = 0; i < cnt; i++)
 805                         sbuf_str(sb, buf);
 806                 s = uc_sub(ln, off, -1);
 807                 sbuf_str(sb, s);
 808                 free(s);
 809                 lbuf_rm(xb, xrow, xrow + 1);
 810                 lbuf_put(xb, xrow, sbuf_buf(sb));
 811                 xoff = off + uc_slen(buf) * cnt - 1;
 812                 sbuf_free(sb);
 813         }
 814         return 0;
 815 }
 816
 817 static int join_spaces(char *prev, char *next)
 818 {
 819         int prevlen = strlen(prev);
 820         if (!prev[0])
 821                 return 0;
 822         if (prev[prevlen - 1] == ' ' || next[0] == ')')
 823                 return 0;
 824         return prev[prevlen - 1] == '.' ? 2 : 1;
 825 }
 826
 827 static int vc_join(void)
 828 {
 829         struct sbuf *sb;
 830         int cnt = vi_arg1 <= 1 ? 2 : vi_arg1;
 831         int beg = xrow;
 832         int end = xrow + cnt;
 833         int off = 0;
 834         int i;
 835         if (!lbuf_get(xb, beg) || !lbuf_get(xb, end - 1))
 836                 return 1;
 837         sb = sbuf_make();
 838         for (i = beg; i < end; i++) {
 839                 char *ln = lbuf_get(xb, i);
 840                 char *lnend = strchr(ln, '\n');
 841                 int spaces;
 842                 if (i > beg)
 843                         while (ln[0] == ' ' || ln[0] == '\t')
 844                                 ln++;
 845                 spaces = i > beg ? join_spaces(sbuf_buf(sb), ln) : 0;
 846                 off = uc_slen(sbuf_buf(sb));
 847                 while (spaces--)
 848                         sbuf_chr(sb, ' ');
 849                 sbuf_mem(sb, ln, lnend - ln);
 850         }
 851         sbuf_chr(sb, '\n');
 852         lbuf_rm(xb, beg, end);
 853         lbuf_put(xb, beg, sbuf_buf(sb));
 854         xoff = off;
 855         sbuf_free(sb);
 856         return 0;
 857 }
 858
 859 static int vi_scrollforeward(int cnt)
 860 {
 861         if (xtop >= lbuf_len(xb) - 1)
 862                 return 1;
 863         xtop = MIN(lbuf_len(xb) - 1, xtop + cnt);
 864         xrow = MAX(xrow, xtop);
 865         return 0;
 866 }
 867
 868 static int vi_scrollbackward(int cnt)
 869 {
 870         if (xtop == 0)
 871                 return 1;
 872         xtop = MAX(0, xtop - cnt);
 873         xrow = MIN(xrow, xtop + xrows - 1);
 874         return 0;
 875 }
 876
 877 static void vc_status(void)
 878 {
 879         int col = vi_off2col(xb, xrow, xoff);
 880         snprintf(vi_msg, sizeof(vi_msg),
 881                 "\"%s\"%c %d lines  L%d C%d\n",
 882                 xpath[0] ? xpath : "unnamed",
 883                 lbuf_modified(xb) ? '*' : ' ',
 884                 lbuf_len(xb), xrow + 1,
 885                 ren_cursor(lbuf_get(xb, xrow), col) + 1);
 886 }
 887
 888 static int vc_replace(void)
 889 {
 890         int cnt = MAX(1, vi_arg1);
 891         char *cs = vi_char();
 892         char *ln = lbuf_get(xb, xrow);
 893         struct sbuf *sb;
 894         char *pref, *post;
 895         char *s;
 896         int off, i;
 897         if (!ln || !cs)
 898                 return 1;
 899         off = ren_noeol(ln, xoff);
 900         s = uc_chr(ln, off);
 901         for (i = 0; s[0] != '\n' && i < cnt; i++)
 902                 s = uc_next(s);
 903         if (i < cnt)
 904                 return 1;
 905         pref = uc_sub(ln, 0, off);
 906         post = uc_sub(ln, off + cnt, -1);
 907         sb = sbuf_make();
 908         sbuf_str(sb, pref);
 909         for (i = 0; i < cnt; i++)
 910                 sbuf_str(sb, cs);
 911         sbuf_str(sb, post);
 912         lbuf_rm(xb, xrow, xrow + 1);
 913         lbuf_put(xb, xrow, sbuf_buf(sb));
 914         off += cnt - 1;
 915         xoff = off;
 916         sbuf_free(sb);
 917         free(pref);
 918         free(post);
 919         return 0;
 920 }
 921
 922 static char rep_cmd[4096];      /* the last command */
 923 static int rep_len;
 924
 925 static void vc_repeat(void)
 926 {
 927         term_push(rep_cmd, rep_len);
 928 }
 929
 930 static void vc_execute(void)
 931 {
 932         static int exec_buf;
 933         int lnmode;
 934         int c = vi_read();
 935         char *buf;
 936         if (TK_INT(c))
 937                 return;
 938         if (c == '@')
 939                 c = exec_buf;
 940         exec_buf = c;
 941         buf = reg_get(exec_buf, &lnmode);
 942         if (buf)
 943                 term_push(buf, strlen(buf));
 944 }
 945
 946 static void vi(void)
 947 {
 948         int xcol;
 949         int mark;
 950         char *ln;
 951         char *kmap = NULL;
 952         term_init();
 953         xtop = 0;
 954         xrow = 0;
 955         xoff = 0;
 956         xcol = vi_off2col(xb, xrow, xoff);
 957         vi_draw(xcol);
 958         term_pos(xrow, led_pos(lbuf_get(xb, xrow), xcol));
 959         while (!xquit) {
 960                 int redraw = 0;
 961                 int nrow = xrow;
 962                 int noff = ren_noeol(lbuf_get(xb, xrow), xoff);
 963                 int otop = xtop;
 964                 int mv, n;
 965                 term_cmd(&n);
 966                 vi_arg2 = 0;
 967                 vi_ybuf = vi_yankbuf();
 968                 vi_arg1 = vi_prefix();
 969                 if (!vi_ybuf)
 970                         vi_ybuf = vi_yankbuf();
 971                 mv = vi_motion(&nrow, &noff);
 972                 if (mv > 0) {
 973                         if (strchr("\'`GHML/?{}[]nN", mv)) {
 974                                 lbuf_mark(xb, '\'', xrow, xoff);
 975                                 lbuf_mark(xb, '`', xrow, xoff);
 976                         }
 977                         xrow = nrow;
 978                         if (noff < 0 && !strchr("jk", mv))
 979                                 noff = lbuf_indents(xb, xrow);
 980                         if (strchr("jk", mv))
 981                                 noff = vi_col2off(xb, xrow, xcol);
 982                         xoff = ren_noeol(lbuf_get(xb, xrow), noff);
 983                         if (!strchr("|jk", mv))
 984                                 xcol = vi_off2col(xb, xrow, xoff);
 985                         if (mv == '|')
 986                                 xcol = vi_pcol;
 987                 } else if (mv == 0) {
 988                         char *cmd;
 989                         int c = vi_read();
 990                         int z, g;
 991                         if (c <= 0)
 992                                 continue;
 993                         lbuf_mark(xb, '*', xrow, xoff);
 994                         switch (c) {
 995                         case TK_CTL('b'):
 996                                 if (vi_scrollbackward(MAX(1, vi_arg1) * (xrows - 1)))
 997                                         break;
 998                                 xoff = lbuf_indents(xb, xrow);
 999                                 redraw = 1;
1000                                 break;
1001                         case TK_CTL('f'):
1002                                 if (vi_scrollforeward(MAX(1, vi_arg1) * (xrows - 1)))
1003                                         break;
1004                                 xoff = lbuf_indents(xb, xrow);
1005                                 redraw = 1;
1006                                 break;
1007                         case TK_CTL('e'):
1008                                 if (vi_scrollforeward(MAX(1, vi_arg1)))
1009                                         break;
1010                                 redraw = 1;
1011                                 break;
1012                         case TK_CTL('y'):
1013                                 if (vi_scrollbackward(MAX(1, vi_arg1)))
1014                                         break;
1015                                 redraw = 1;
1016                                 break;
1017                         case TK_CTL('z'):
1018                                 term_pos(xrows, 0);
1019                                 term_suspend();
1020                                 redraw = 1;
1021                                 break;
1022                         case 'u':
1023                                 if (!lbuf_undo(xb)) {
1024                                         lbuf_jump(xb, '*', &xrow, &xoff);
1025                                         redraw = 1;
1026                                 } else {
1027                                         snprintf(vi_msg, sizeof(vi_msg), "undo failed\n");
1028                                 }
1029                                 break;
1030                         case TK_CTL('r'):
1031                                 if (!lbuf_redo(xb)) {
1032                                         lbuf_jump(xb, '*', &xrow, &xoff);
1033                                         redraw = 1;
1034                                 } else {
1035                                         snprintf(vi_msg, sizeof(vi_msg), "redo failed\n");
1036                                 }
1037                                 break;
1038                         case TK_CTL('g'):
1039                                 vc_status();
1040                                 break;
1041                         case TK_CTL('^'):
1042                                 ex_command("e #");
1043                                 redraw = 1;
1044                                 break;
1045                         case ':':
1046                                 ln = vi_prompt(":", &kmap);
1047                                 if (ln && ln[0]) {
1048                                         ex_command(ln);
1049                                         redraw = 1;
1050                                 }
1051                                 free(ln);
1052                                 if (xquit)
1053                                         continue;
1054                                 break;
1055                         case 'c':
1056                         case 'd':
1057                         case 'y':
1058                         case '!':
1059                         case '>':
1060                         case '<':
1061                                 if (!vc_motion(c))
1062                                         redraw = 1;
1063                                 break;
1064                         case 'i':
1065                         case 'I':
1066                         case 'a':
1067                         case 'A':
1068                         case 'o':
1069                         case 'O':
1070                                 if (!vc_insert(c))
1071                                         redraw = 1;
1072                                 break;
1073                         case 'J':
1074                                 if (!vc_join())
1075                                         redraw = 1;
1076                                 break;
1077                         case 'm':
1078                                 if ((mark = vi_read()) > 0 && islower(mark))
1079                                         lbuf_mark(xb, mark, xrow, xoff);
1080                                 break;
1081                         case 'p':
1082                         case 'P':
1083                                 if (!vc_put(c))
1084                                         redraw = 1;
1085                                 break;
1086                         case 'z':
1087                                 z = vi_read();
1088                                 switch (z) {
1089                                 case '\n':
1090                                         xtop = vi_arg1 ? vi_arg1 : xrow;
1091                                         break;
1092                                 case '.':
1093                                         n = vi_arg1 ? vi_arg1 : xrow;
1094                                         xtop = MAX(0, n - xrows / 2);
1095                                         break;
1096                                 case '-':
1097                                         n = vi_arg1 ? vi_arg1 : xrow;
1098                                         xtop = MAX(0, n - xrows + 1);
1099                                         break;
1100                                 case 'l':
1101                                 case 'r':
1102                                         xdir = z == 'r' ? -1 : +1;
1103                                         break;
1104                                 case 'L':
1105                                 case 'R':
1106                                         xdir = z == 'R' ? -2 : +2;
1107                                         break;
1108                                 }
1109                                 redraw = 1;
1110                                 break;
1111                         case 'g':
1112                                 g = vi_read();
1113                                 if (g == '~' || g == 'u' || g == 'U')
1114                                         if (!vc_motion(g))
1115                                                 redraw = 1;
1116                                 break;
1117                         case 'x':
1118                                 vi_back(' ');
1119                                 if (!vc_motion('d'))
1120                                         redraw = 1;
1121                                 break;
1122                         case 'X':
1123                                 vi_back(TK_CTL('h'));
1124                                 if (!vc_motion('d'))
1125                                         redraw = 1;
1126                                 break;
1127                         case 'C':
1128                                 vi_back('$');
1129                                 if (!vc_motion('c'))
1130                                         redraw = 1;
1131                                 break;
1132                         case 'D':
1133                                 vi_back('$');
1134                                 if (!vc_motion('d'))
1135                                         redraw = 1;
1136                                 break;
1137                         case 'r':
1138                                 if (!vc_replace())
1139                                         redraw = 1;
1140                                 break;
1141                         case 's':
1142                                 vi_back(' ');
1143                                 if (!vc_motion('c'))
1144                                         redraw = 1;
1145                                 break;
1146                         case 'S':
1147                                 vi_back('c');
1148                                 if (!vc_motion('c'))
1149                                         redraw = 1;
1150                                 break;
1151                         case 'Y':
1152                                 vi_back('y');
1153                                 if (!vc_motion('y'))
1154                                         redraw = 1;
1155                                 break;
1156                         case '~':
1157                                 vi_back(' ');
1158                                 if (!vc_motion('~'))
1159                                         redraw = 1;
1160                                 break;
1161                         case '.':
1162                                 vc_repeat();
1163                                 break;
1164                         case '@':
1165                                 vc_execute();
1166                                 break;
1167                         default:
1168                                 continue;
1169                         }
1170                         cmd = term_cmd(&n);
1171                         if (strchr("!<>ACDIJOPRSXYacdioprsxy~", c)) {
1172                                 if (n < sizeof(rep_cmd)) {
1173                                         memcpy(rep_cmd, cmd, n);
1174                                         rep_len = n;
1175                                 }
1176                         }
1177                 }
1178                 if (xrow < 0 || xrow >= lbuf_len(xb))
1179                         xrow = lbuf_len(xb) ? lbuf_len(xb) - 1 : 0;
1180                 if (xtop > xrow)
1181                         xtop = xtop - xrows / 2 > xrow ?
1182                                         MAX(0, xrow - xrows / 2) : xrow;
1183                 if (xtop + xrows <= xrow)
1184                         xtop = xtop + xrows + xrows / 2 <= xrow ?
1185                                         xrow - xrows / 2 : xrow - xrows + 1;
1186                 xoff = ren_noeol(lbuf_get(xb, xrow), xoff);
1187                 if (redraw)
1188                         xcol = vi_off2col(xb, xrow, xoff);
1189                 if (redraw || xtop != otop)
1190                         vi_draw(xcol);
1191                 if (vi_msg[0])
1192                         vi_drawmsg();
1193                 term_pos(xrow - xtop, led_pos(lbuf_get(xb, xrow),
1194                                 ren_cursor(lbuf_get(xb, xrow), xcol)));
1195                 lbuf_modified(xb);
1196         }
1197         term_pos(xrows, 0);
1198         term_kill();
1199         term_done();
1200 }
1201
1202 int main(int argc, char *argv[])
1203 {
1204         char ecmd[PATHLEN];
1205         int i;
1206         xb = lbuf_make();
1207         xvis = 1;
1208         for (i = 1; i < argc && argv[i][0] == '-'; i++) {
1209                 if (argv[i][1] == 's')
1210                         xled = 0;
1211                 if (argv[i][1] == 'e')
1212                         xvis = 0;
1213                 if (argv[i][1] == 'v')
1214                         xvis = 1;
1215         }
1216         dir_init();
1217         syn_init();
1218         if (i < argc) {
1219                 snprintf(ecmd, PATHLEN, "e %s", argv[i]);
1220                 ex_command(ecmd);
1221         }
1222         if (xvis)
1223                 vi();
1224         else
1225                 ex();
1226         lbuf_free(xb);
1227         reg_done();
1228         syn_done();
1229         dir_done();
1230         return 0;
1231 }