window.c

   1 /* $OpenBSD$ */
   2
   3 /*
   4  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  15  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  16  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <sys/types.h>
  20 #include <sys/ioctl.h>
  21
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <fnmatch.h>
  25 #include <paths.h>
  26 #include <pwd.h>
  27 #include <signal.h>
  28 #include <stdint.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <termios.h>
  32 #include <unistd.h>
  33 #include <util.h>
  34
  35 #include "tmux.h"
  36
  37 /*
  38  * Each window is attached to a number of panes, each of which is a pty. This
  39  * file contains code to handle them.
  40  *
  41  * A pane has two buffers attached, these are filled and emptied by the main
  42  * server poll loop. Output data is received from pty's in screen format,
  43  * translated and returned as a series of escape sequences and strings via
  44  * input_parse (in input.c). Input data is received as key codes and written
  45  * directly via input_key.
  46  *
  47  * Each pane also has a "virtual" screen (screen.c) which contains the current
  48  * state and is redisplayed when the window is reattached to a client.
  49  *
  50  * Windows are stored directly on a global array and wrapped in any number of
  51  * winlink structs to be linked onto local session RB trees. A reference count
  52  * is maintained and a window removed from the global list and destroyed when
  53  * it reaches zero.
  54  */
  55
  56 /* Global window list. */
  57 struct windows windows;
  58
  59 void    window_pane_read_callback(struct bufferevent *, void *);
  60 void    window_pane_error_callback(struct bufferevent *, short, void *);
  61
  62 RB_GENERATE(winlinks, winlink, entry, winlink_cmp);
  63
  64 int
  65 winlink_cmp(struct winlink *wl1, struct winlink *wl2)
  66 {
  67         return (wl1->idx - wl2->idx);
  68 }
  69
  70 struct winlink *
  71 winlink_find_by_window(struct winlinks *wwl, struct window *w)
  72 {
  73         struct winlink  *wl;
  74
  75         RB_FOREACH(wl, winlinks, wwl) {
  76                 if (wl->window == w)
  77                         return (wl);
  78         }
  79
  80         return (NULL);
  81 }
  82
  83 struct winlink *
  84 winlink_find_by_index(struct winlinks *wwl, int idx)
  85 {
  86         struct winlink  wl;
  87
  88         if (idx < 0)
  89                 fatalx("bad index");
  90
  91         wl.idx = idx;
  92         return (RB_FIND(winlinks, wwl, &wl));
  93 }
  94
  95 int
  96 winlink_next_index(struct winlinks *wwl, int idx)
  97 {
  98         int     i;
  99
 100         i = idx;
 101         do {
 102                 if (winlink_find_by_index(wwl, i) == NULL)
 103                         return (i);
 104                 if (i == INT_MAX)
 105                         i = 0;
 106                 else
 107                         i++;
 108         } while (i != idx);
 109         return (-1);
 110 }
 111
 112 u_int
 113 winlink_count(struct winlinks *wwl)
 114 {
 115         struct winlink  *wl;
 116         u_int            n;
 117
 118         n = 0;
 119         RB_FOREACH(wl, winlinks, wwl)
 120                 n++;
 121
 122         return (n);
 123 }
 124
 125 struct winlink *
 126 winlink_add(struct winlinks *wwl, struct window *w, int idx)
 127 {
 128         struct winlink  *wl;
 129
 130         if (idx < 0) {
 131                 if ((idx = winlink_next_index(wwl, -idx - 1)) == -1)
 132                         return (NULL);
 133         } else if (winlink_find_by_index(wwl, idx) != NULL)
 134                 return (NULL);
 135
 136         wl = xcalloc(1, sizeof *wl);
 137         wl->idx = idx;
 138         wl->window = w;
 139         RB_INSERT(winlinks, wwl, wl);
 140
 141         w->references++;
 142
 143         return (wl);
 144 }
 145
 146 void
 147 winlink_remove(struct winlinks *wwl, struct winlink *wl)
 148 {
 149         struct window   *w = wl->window;
 150
 151         RB_REMOVE(winlinks, wwl, wl);
 152         if (wl->status_text != NULL)
 153                 xfree(wl->status_text);
 154         xfree(wl);
 155
 156         if (w->references == 0)
 157                 fatal("bad reference count");
 158         w->references--;
 159         if (w->references == 0)
 160                 window_destroy(w);
 161 }
 162
 163 struct winlink *
 164 winlink_next(struct winlink *wl)
 165 {
 166         return (RB_NEXT(winlinks, wwl, wl));
 167 }
 168
 169 struct winlink *
 170 winlink_previous(struct winlink *wl)
 171 {
 172         return (RB_PREV(winlinks, wwl, wl));
 173 }
 174
 175 struct winlink *
 176 winlink_next_by_number(struct winlink *wl, struct session *s, int n)
 177 {
 178         for (; n > 0; n--) {
 179                 if ((wl = RB_NEXT(winlinks, wwl, wl)) == NULL)
 180                         wl = RB_MIN(winlinks, &s->windows);
 181         }
 182
 183         return (wl);
 184 }
 185
 186 struct winlink *
 187 winlink_previous_by_number(struct winlink *wl, struct session *s, int n)
 188 {
 189         for (; n > 0; n--) {
 190                 if ((wl = RB_PREV(winlinks, wwl, wl)) == NULL)
 191                         wl = RB_MAX(winlinks, &s->windows);
 192         }
 193
 194         return (wl);
 195 }
 196
 197 void
 198 winlink_stack_push(struct winlink_stack *stack, struct winlink *wl)
 199 {
 200         if (wl == NULL)
 201                 return;
 202
 203         winlink_stack_remove(stack, wl);
 204         TAILQ_INSERT_HEAD(stack, wl, sentry);
 205 }
 206
 207 void
 208 winlink_stack_remove(struct winlink_stack *stack, struct winlink *wl)
 209 {
 210         struct winlink  *wl2;
 211
 212         if (wl == NULL)
 213                 return;
 214
 215         TAILQ_FOREACH(wl2, stack, sentry) {
 216                 if (wl2 == wl) {
 217                         TAILQ_REMOVE(stack, wl, sentry);
 218                         return;
 219                 }
 220         }
 221 }
 222
 223 int
 224 window_index(struct window *s, u_int *i)
 225 {
 226         for (*i = 0; *i < ARRAY_LENGTH(&windows); (*i)++) {
 227                 if (s == ARRAY_ITEM(&windows, *i))
 228                         return (0);
 229         }
 230         return (-1);
 231 }
 232
 233 struct window *
 234 window_create1(u_int sx, u_int sy)
 235 {
 236         struct window   *w;
 237         u_int            i;
 238
 239         w = xcalloc(1, sizeof *w);
 240         w->name = NULL;
 241         w->flags = 0;
 242
 243         TAILQ_INIT(&w->panes);
 244         w->active = NULL;
 245
 246         w->lastlayout = -1;
 247         w->layout_root = NULL;
 248
 249         w->sx = sx;
 250         w->sy = sy;
 251
 252         queue_window_name(w);
 253
 254         options_init(&w->options, &global_w_options);
 255
 256         for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
 257                 if (ARRAY_ITEM(&windows, i) == NULL) {
 258                         ARRAY_SET(&windows, i, w);
 259                         break;
 260                 }
 261         }
 262         if (i == ARRAY_LENGTH(&windows))
 263                 ARRAY_ADD(&windows, w);
 264         w->references = 0;
 265
 266         return (w);
 267 }
 268
 269 struct window *
 270 window_create(const char *name, const char *cmd, const char *shell,
 271     const char *cwd, struct environ *env, struct termios *tio,
 272     u_int sx, u_int sy, u_int hlimit,char **cause)
 273 {
 274         struct window           *w;
 275         struct window_pane      *wp;
 276
 277         w = window_create1(sx, sy);
 278         wp = window_add_pane(w, hlimit);
 279         layout_init(w);
 280         if (window_pane_spawn(wp, cmd, shell, cwd, env, tio, cause) != 0) {
 281                 window_destroy(w);
 282                 return (NULL);
 283         }
 284         w->active = TAILQ_FIRST(&w->panes);
 285         if (name != NULL) {
 286                 w->name = xstrdup(name);
 287                 options_set_number(&w->options, "automatic-rename", 0);
 288         } else
 289                 w->name = default_window_name(w);
 290         return (w);
 291 }
 292
 293 void
 294 window_destroy(struct window *w)
 295 {
 296         u_int   i;
 297
 298         if (window_index(w, &i) != 0)
 299                 fatalx("index not found");
 300         ARRAY_SET(&windows, i, NULL);
 301         while (!ARRAY_EMPTY(&windows) && ARRAY_LAST(&windows) == NULL)
 302                 ARRAY_TRUNC(&windows, 1);
 303
 304         if (w->layout_root != NULL)
 305                 layout_free(w);
 306
 307         evtimer_del(&w->name_timer);
 308
 309         options_free(&w->options);
 310
 311         window_destroy_panes(w);
 312
 313         if (w->name != NULL)
 314                 xfree(w->name);
 315         xfree(w);
 316 }
 317
 318 void
 319 window_resize(struct window *w, u_int sx, u_int sy)
 320 {
 321         w->sx = sx;
 322         w->sy = sy;
 323 }
 324
 325 void
 326 window_set_active_pane(struct window *w, struct window_pane *wp)
 327 {
 328         if (wp == w->active)
 329                 return;
 330         w->last = w->active;
 331         w->active = wp;
 332         while (!window_pane_visible(w->active)) {
 333                 w->active = TAILQ_PREV(w->active, window_panes, entry);
 334                 if (w->active == NULL)
 335                         w->active = TAILQ_LAST(&w->panes, window_panes);
 336                 if (w->active == wp)
 337                         return;
 338         }
 339 }
 340
 341 void
 342 window_set_active_at(struct window *w, u_int x, u_int y)
 343 {
 344         struct window_pane      *wp;
 345
 346         TAILQ_FOREACH(wp, &w->panes, entry) {
 347                 if (wp == w->active || !window_pane_visible(wp))
 348                         continue;
 349                 if (x < wp->xoff || x >= wp->xoff + wp->sx)
 350                         continue;
 351                 if (y < wp->yoff || y >= wp->yoff + wp->sy)
 352                         continue;
 353                 window_set_active_pane(w, wp);
 354                 break;
 355         }
 356 }
 357
 358 struct window_pane *
 359 window_add_pane(struct window *w, u_int hlimit)
 360 {
 361         struct window_pane      *wp;
 362
 363         wp = window_pane_create(w, w->sx, w->sy, hlimit);
 364         if (TAILQ_EMPTY(&w->panes))
 365                 TAILQ_INSERT_HEAD(&w->panes, wp, entry);
 366         else
 367                 TAILQ_INSERT_AFTER(&w->panes, w->active, wp, entry);
 368         return (wp);
 369 }
 370
 371 void
 372 window_remove_pane(struct window *w, struct window_pane *wp)
 373 {
 374         if (wp == w->active) {
 375                 w->active = w->last;
 376                 w->last = NULL;
 377                 if (w->active == NULL) {
 378                         w->active = TAILQ_PREV(wp, window_panes, entry);
 379                         if (w->active == NULL)
 380                                 w->active = TAILQ_NEXT(wp, entry);
 381                 }
 382         } else if (wp == w->last)
 383                 w->last = NULL;
 384
 385         TAILQ_REMOVE(&w->panes, wp, entry);
 386         window_pane_destroy(wp);
 387 }
 388
 389 struct window_pane *
 390 window_pane_at_index(struct window *w, u_int idx)
 391 {
 392         struct window_pane      *wp;
 393         u_int                    n;
 394
 395         n = 0;
 396         TAILQ_FOREACH(wp, &w->panes, entry) {
 397                 if (n == idx)
 398                         return (wp);
 399                 n++;
 400         }
 401         return (NULL);
 402 }
 403
 404 struct window_pane *
 405 window_pane_next_by_number(struct window *w, struct window_pane *wp, u_int n)
 406 {
 407         for (; n > 0; n--) {
 408                 if ((wp = TAILQ_NEXT(wp, entry)) == NULL)
 409                         wp = TAILQ_FIRST(&w->panes);
 410         }
 411
 412         return (wp);
 413 }
 414
 415 struct window_pane *
 416 window_pane_previous_by_number(struct window *w, struct window_pane *wp,
 417     u_int n)
 418 {
 419         for (; n > 0; n--) {
 420                 if ((wp = TAILQ_PREV(wp, window_panes, entry)) == NULL)
 421                         wp = TAILQ_LAST(&w->panes, window_panes);
 422         }
 423
 424         return (wp);
 425 }
 426
 427 u_int
 428 window_pane_index(struct window *w, struct window_pane *wp)
 429 {
 430         struct window_pane      *wq;
 431         u_int                    n;
 432
 433         n = 0;
 434         TAILQ_FOREACH(wq, &w->panes, entry) {
 435                 if (wp == wq)
 436                         break;
 437                 n++;
 438         }
 439         return (n);
 440 }
 441
 442 u_int
 443 window_count_panes(struct window *w)
 444 {
 445         struct window_pane      *wp;
 446         u_int                    n;
 447
 448         n = 0;
 449         TAILQ_FOREACH(wp, &w->panes, entry)
 450                 n++;
 451         return (n);
 452 }
 453
 454 void
 455 window_destroy_panes(struct window *w)
 456 {
 457         struct window_pane      *wp;
 458
 459         while (!TAILQ_EMPTY(&w->panes)) {
 460                 wp = TAILQ_FIRST(&w->panes);
 461                 TAILQ_REMOVE(&w->panes, wp, entry);
 462                 window_pane_destroy(wp);
 463         }
 464 }
 465
 466 struct window_pane *
 467 window_pane_create(struct window *w, u_int sx, u_int sy, u_int hlimit)
 468 {
 469         struct window_pane      *wp;
 470
 471         wp = xcalloc(1, sizeof *wp);
 472         wp->window = w;
 473
 474         wp->cmd = NULL;
 475         wp->shell = NULL;
 476         wp->cwd = NULL;
 477
 478         wp->fd = -1;
 479         wp->event = NULL;
 480
 481         wp->mode = NULL;
 482
 483         wp->layout_cell = NULL;
 484
 485         wp->xoff = 0;
 486         wp->yoff = 0;
 487
 488         wp->sx = sx;
 489         wp->sy = sy;
 490
 491         wp->pipe_fd = -1;
 492         wp->pipe_off = 0;
 493         wp->pipe_event = NULL;
 494
 495         wp->saved_grid = NULL;
 496
 497         screen_init(&wp->base, sx, sy, hlimit);
 498         wp->screen = &wp->base;
 499
 500         input_init(wp);
 501
 502         return (wp);
 503 }
 504
 505 void
 506 window_pane_destroy(struct window_pane *wp)
 507 {
 508         window_pane_reset_mode(wp);
 509
 510         if (wp->fd != -1) {
 511                 close(wp->fd);
 512                 bufferevent_free(wp->event);
 513         }
 514
 515         input_free(wp);
 516
 517         screen_free(&wp->base);
 518         if (wp->saved_grid != NULL)
 519                 grid_destroy(wp->saved_grid);
 520
 521         if (wp->pipe_fd != -1) {
 522                 close(wp->pipe_fd);
 523                 bufferevent_free(wp->pipe_event);
 524         }
 525
 526         if (wp->cwd != NULL)
 527                 xfree(wp->cwd);
 528         if (wp->shell != NULL)
 529                 xfree(wp->shell);
 530         if (wp->cmd != NULL)
 531                 xfree(wp->cmd);
 532         xfree(wp);
 533 }
 534
 535 int
 536 window_pane_spawn(struct window_pane *wp, const char *cmd, const char *shell,
 537     const char *cwd, struct environ *env, struct termios *tio, char **cause)
 538 {
 539         struct winsize   ws;
 540         int              mode;
 541         char            *argv0;
 542         const char      *ptr;
 543         struct termios   tio2;
 544
 545         if (wp->fd != -1) {
 546                 close(wp->fd);
 547                 bufferevent_free(wp->event);
 548         }
 549         if (cmd != NULL) {
 550                 if (wp->cmd != NULL)
 551                         xfree(wp->cmd);
 552                 wp->cmd = xstrdup(cmd);
 553         }
 554         if (shell != NULL) {
 555                 if (wp->shell != NULL)
 556                         xfree(wp->shell);
 557                 wp->shell = xstrdup(shell);
 558         }
 559         if (cwd != NULL) {
 560                 if (wp->cwd != NULL)
 561                         xfree(wp->cwd);
 562                 wp->cwd = xstrdup(cwd);
 563         }
 564
 565         memset(&ws, 0, sizeof ws);
 566         ws.ws_col = screen_size_x(&wp->base);
 567         ws.ws_row = screen_size_y(&wp->base);
 568
 569         switch (wp->pid = forkpty(&wp->fd, wp->tty, NULL, &ws)) {
 570         case -1:
 571                 wp->fd = -1;
 572                 xasprintf(cause, "%s: %s", cmd, strerror(errno));
 573                 return (-1);
 574         case 0:
 575                 if (chdir(wp->cwd) != 0)
 576                         chdir("/");
 577
 578                 if (tcgetattr(STDIN_FILENO, &tio2) != 0)
 579                         fatal("tcgetattr failed");
 580                 if (tio != NULL)
 581                         memcpy(tio2.c_cc, tio->c_cc, sizeof tio2.c_cc);
 582                 tio2.c_cc[VERASE] = '\177';
 583                 if (tcsetattr(STDIN_FILENO, TCSANOW, &tio2) != 0)
 584                         fatal("tcgetattr failed");
 585
 586                 closefrom(STDERR_FILENO + 1);
 587
 588                 environ_push(env);
 589
 590                 clear_signals(1);
 591                 log_close();
 592
 593                 if (*wp->cmd != '\0') {
 594                         /* Set SHELL but only if it is currently not useful. */
 595                         shell = getenv("SHELL");
 596                         if (shell == NULL || *shell == '\0' || areshell(shell))
 597                                 setenv("SHELL", wp->shell, 1);
 598
 599                         execl(_PATH_BSHELL, "sh", "-c", wp->cmd, (char *) NULL);
 600                         fatal("execl failed");
 601                 }
 602
 603                 /* No command; fork a login shell. */
 604                 ptr = strrchr(wp->shell, '/');
 605                 if (ptr != NULL && *(ptr + 1) != '\0')
 606                         xasprintf(&argv0, "-%s", ptr + 1);
 607                 else
 608                         xasprintf(&argv0, "-%s", wp->shell);
 609                 setenv("SHELL", wp->shell, 1);
 610                 execl(wp->shell, argv0, (char *) NULL);
 611                 fatal("execl failed");
 612         }
 613
 614         if ((mode = fcntl(wp->fd, F_GETFL)) == -1)
 615                 fatal("fcntl failed");
 616         if (fcntl(wp->fd, F_SETFL, mode|O_NONBLOCK) == -1)
 617                 fatal("fcntl failed");
 618         wp->event = bufferevent_new(wp->fd,
 619             window_pane_read_callback, NULL, window_pane_error_callback, wp);
 620         bufferevent_enable(wp->event, EV_READ|EV_WRITE);
 621
 622         return (0);
 623 }
 624
 625 /* ARGSUSED */
 626 void
 627 window_pane_read_callback(unused struct bufferevent *bufev, void *data)
 628 {
 629         struct window_pane     *wp = data;
 630         char                   *new_data;
 631         size_t                  new_size;
 632
 633         new_size = EVBUFFER_LENGTH(wp->event->input) - wp->pipe_off;
 634         if (wp->pipe_fd != -1 && new_size > 0) {
 635                 new_data = EVBUFFER_DATA(wp->event->input);
 636                 bufferevent_write(wp->pipe_event, new_data, new_size);
 637         }
 638
 639         input_parse(wp);
 640
 641         wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
 642 }
 643
 644 /* ARGSUSED */
 645 void
 646 window_pane_error_callback(
 647     unused struct bufferevent *bufev, unused short what, void *data)
 648 {
 649         struct window_pane *wp = data;
 650
 651         server_destroy_pane(wp);
 652 }
 653
 654 void
 655 window_pane_resize(struct window_pane *wp, u_int sx, u_int sy)
 656 {
 657         struct winsize  ws;
 658
 659         if (sx == wp->sx && sy == wp->sy)
 660                 return;
 661         wp->sx = sx;
 662         wp->sy = sy;
 663
 664         memset(&ws, 0, sizeof ws);
 665         ws.ws_col = sx;
 666         ws.ws_row = sy;
 667
 668         screen_resize(&wp->base, sx, sy);
 669         if (wp->mode != NULL)
 670                 wp->mode->resize(wp, sx, sy);
 671
 672         if (wp->fd != -1 && ioctl(wp->fd, TIOCSWINSZ, &ws) == -1)
 673                 fatal("ioctl failed");
 674 }
 675
 676 /*
 677  * Enter alternative screen mode. A copy of the visible screen is saved and the
 678  * history is not updated
 679  */
 680 void
 681 window_pane_alternate_on(struct window_pane *wp, struct grid_cell *gc)
 682 {
 683         struct screen   *s = &wp->base;
 684         u_int            sx, sy;
 685
 686         if (wp->saved_grid != NULL)
 687                 return;
 688         if (!options_get_number(&wp->window->options, "alternate-screen"))
 689                 return;
 690         sx = screen_size_x(s);
 691         sy = screen_size_y(s);
 692
 693         wp->saved_grid = grid_create(sx, sy, 0);
 694         grid_duplicate_lines(wp->saved_grid, 0, s->grid, screen_hsize(s), sy);
 695         wp->saved_cx = s->cx;
 696         wp->saved_cy = s->cy;
 697         memcpy(&wp->saved_cell, gc, sizeof wp->saved_cell);
 698
 699         grid_view_clear(s->grid, 0, 0, sx, sy);
 700
 701         wp->base.grid->flags &= ~GRID_HISTORY;
 702
 703         wp->flags |= PANE_REDRAW;
 704 }
 705
 706 /* Exit alternate screen mode and restore the copied grid. */
 707 void
 708 window_pane_alternate_off(struct window_pane *wp, struct grid_cell *gc)
 709 {
 710         struct screen   *s = &wp->base;
 711         u_int            sx, sy;
 712
 713         if (wp->saved_grid == NULL)
 714                 return;
 715         if (!options_get_number(&wp->window->options, "alternate-screen"))
 716                 return;
 717         sx = screen_size_x(s);
 718         sy = screen_size_y(s);
 719
 720         /*
 721          * If the current size is bigger, temporarily resize to the old size
 722          * before copying back.
 723          */
 724         if (sy > wp->saved_grid->sy)
 725                 screen_resize(s, sx, wp->saved_grid->sy);
 726
 727         /* Restore the grid, cursor position and cell. */
 728         grid_duplicate_lines(s->grid, screen_hsize(s), wp->saved_grid, 0, sy);
 729         s->cx = wp->saved_cx;
 730         if (s->cx > screen_size_x(s) - 1)
 731                 s->cx = screen_size_x(s) - 1;
 732         s->cy = wp->saved_cy;
 733         if (s->cy > screen_size_y(s) - 1)
 734                 s->cy = screen_size_y(s) - 1;
 735         memcpy(gc, &wp->saved_cell, sizeof *gc);
 736
 737         /*
 738          * Turn history back on (so resize can use it) and then resize back to
 739          * the current size.
 740          */
 741         wp->base.grid->flags |= GRID_HISTORY;
 742         if (sy > wp->saved_grid->sy)
 743                 screen_resize(s, sx, sy);
 744
 745         grid_destroy(wp->saved_grid);
 746         wp->saved_grid = NULL;
 747
 748         wp->flags |= PANE_REDRAW;
 749 }
 750
 751 int
 752 window_pane_set_mode(struct window_pane *wp, const struct window_mode *mode)
 753 {
 754         struct screen   *s;
 755
 756         if (wp->mode != NULL)
 757                 return (1);
 758         wp->mode = mode;
 759
 760         if ((s = wp->mode->init(wp)) != NULL)
 761                 wp->screen = s;
 762         wp->flags |= PANE_REDRAW;
 763         return (0);
 764 }
 765
 766 void
 767 window_pane_reset_mode(struct window_pane *wp)
 768 {
 769         if (wp->mode == NULL)
 770                 return;
 771
 772         wp->mode->free(wp);
 773         wp->mode = NULL;
 774
 775         wp->screen = &wp->base;
 776         wp->flags |= PANE_REDRAW;
 777 }
 778
 779 void
 780 window_pane_key(struct window_pane *wp, struct session *sess, int key)
 781 {
 782         struct window_pane      *wp2;
 783
 784         if (!window_pane_visible(wp))
 785                 return;
 786
 787         if (wp->mode != NULL) {
 788                 if (wp->mode->key != NULL)
 789                         wp->mode->key(wp, sess, key);
 790                 return;
 791         }
 792
 793         if (wp->fd == -1)
 794                 return;
 795         input_key(wp, key);
 796         if (options_get_number(&wp->window->options, "synchronize-panes")) {
 797                 TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 798                         if (wp2 == wp || wp2->mode != NULL)
 799                                 continue;
 800                         if (wp2->fd != -1 && window_pane_visible(wp2))
 801                                 input_key(wp2, key);
 802                 }
 803         }
 804 }
 805
 806 void
 807 window_pane_mouse(
 808     struct window_pane *wp, struct session *sess, struct mouse_event *m)
 809 {
 810         if (!window_pane_visible(wp))
 811                 return;
 812
 813         if (m->x < wp->xoff || m->x >= wp->xoff + wp->sx)
 814                 return;
 815         if (m->y < wp->yoff || m->y >= wp->yoff + wp->sy)
 816                 return;
 817         m->x -= wp->xoff;
 818         m->y -= wp->yoff;
 819
 820         if (wp->mode != NULL) {
 821                 if (wp->mode->mouse != NULL)
 822                         wp->mode->mouse(wp, sess, m);
 823         } else if (wp->fd != -1)
 824                 input_mouse(wp, m);
 825 }
 826
 827 int
 828 window_pane_visible(struct window_pane *wp)
 829 {
 830         struct window   *w = wp->window;
 831
 832         if (wp->xoff >= w->sx || wp->yoff >= w->sy)
 833                 return (0);
 834         if (wp->xoff + wp->sx > w->sx || wp->yoff + wp->sy > w->sy)
 835                 return (0);
 836         return (1);
 837 }
 838
 839 char *
 840 window_pane_search(struct window_pane *wp, const char *searchstr, u_int *lineno)
 841 {
 842         struct screen   *s = &wp->base;
 843         char            *newsearchstr, *line, *msg;
 844         u_int            i;
 845
 846         msg = NULL;
 847         xasprintf(&newsearchstr, "*%s*", searchstr);
 848
 849         for (i = 0; i < screen_size_y(s); i++) {
 850                 line = grid_view_string_cells(s->grid, 0, i, screen_size_x(s));
 851                 if (fnmatch(newsearchstr, line, 0) == 0) {
 852                         msg = line;
 853                         if (lineno != NULL)
 854                                 *lineno = i;
 855                         break;
 856                 }
 857                 xfree(line);
 858         }
 859
 860         xfree(newsearchstr);
 861         return (msg);
 862 }
 863
 864 /* Find the pane directly above another. */
 865 struct window_pane *
 866 window_pane_find_up(struct window_pane *wp)
 867 {
 868         struct window_pane     *wp2;
 869         u_int                   left, top;
 870
 871         if (wp == NULL || !window_pane_visible(wp))
 872                 return (NULL);
 873
 874         top = wp->yoff;
 875         if (top == 0)
 876                 top = wp->window->sy + 1;
 877         left = wp->xoff;
 878
 879         TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 880                 if (!window_pane_visible(wp2))
 881                         continue;
 882                 if (wp2->yoff + wp2->sy + 1 != top)
 883                         continue;
 884                 if (left >= wp2->xoff && left <= wp2->xoff + wp2->sx)
 885                         return (wp2);
 886         }
 887         return (NULL);
 888 }
 889
 890 /* Find the pane directly below another. */
 891 struct window_pane *
 892 window_pane_find_down(struct window_pane *wp)
 893 {
 894         struct window_pane     *wp2;
 895         u_int                   left, bottom;
 896
 897         if (wp == NULL || !window_pane_visible(wp))
 898                 return (NULL);
 899
 900         bottom = wp->yoff + wp->sy + 1;
 901         if (bottom >= wp->window->sy)
 902                 bottom = 0;
 903         left = wp->xoff;
 904
 905         TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 906                 if (!window_pane_visible(wp2))
 907                         continue;
 908                 if (wp2->yoff != bottom)
 909                         continue;
 910                 if (left >= wp2->xoff && left <= wp2->xoff + wp2->sx)
 911                         return (wp2);
 912         }
 913         return (NULL);
 914 }
 915
 916 /*
 917  * Find the pane directly to the left of another, adjacent to the left side and
 918  * containing the top edge.
 919  */
 920 struct window_pane *
 921 window_pane_find_left(struct window_pane *wp)
 922 {
 923         struct window_pane     *wp2;
 924         u_int                   left, top;
 925
 926         if (wp == NULL || !window_pane_visible(wp))
 927                 return (NULL);
 928
 929         left = wp->xoff;
 930         if (left == 0)
 931                 left = wp->window->sx + 1;
 932         top = wp->yoff;
 933
 934         TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 935                 if (!window_pane_visible(wp2))
 936                         continue;
 937                 if (wp2->xoff + wp2->sx + 1 != left)
 938                         continue;
 939                 if (top >= wp2->yoff && top <= wp2->yoff + wp2->sy)
 940                         return (wp2);
 941         }
 942         return (NULL);
 943 }
 944
 945 /*
 946  * Find the pane directly to the right of another, that is adjacent to the
 947  * right edge and including the top edge.
 948  */
 949 struct window_pane *
 950 window_pane_find_right(struct window_pane *wp)
 951 {
 952         struct window_pane     *wp2;
 953         u_int                   right, top;
 954
 955         if (wp == NULL || !window_pane_visible(wp))
 956                 return (NULL);
 957
 958         right = wp->xoff + wp->sx + 1;
 959         if (right >= wp->window->sx)
 960                 right = 0;
 961         top = wp->yoff;
 962
 963         TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 964                 if (!window_pane_visible(wp2))
 965                         continue;
 966                 if (wp2->xoff != right)
 967                         continue;
 968                 if (top >= wp2->yoff && top <= wp2->yoff + wp2->sy)
 969                         return (wp2);
 970         }
 971         return (NULL);
 972 }