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         w->active = wp;
 329         while (!window_pane_visible(w->active)) {
 330                 w->active = TAILQ_PREV(w->active, window_panes, entry);
 331                 if (w->active == NULL)
 332                         w->active = TAILQ_LAST(&w->panes, window_panes);
 333                 if (w->active == wp)
 334                         return;
 335         }
 336 }
 337
 338 void
 339 window_set_active_at(struct window *w, u_int x, u_int y)
 340 {
 341         struct window_pane      *wp;
 342
 343         TAILQ_FOREACH(wp, &w->panes, entry) {
 344                 if (!window_pane_visible(wp))
 345                         continue;
 346                 if (x < wp->xoff || x >= wp->xoff + wp->sx)
 347                         continue;
 348                 if (y < wp->yoff || y >= wp->yoff + wp->sy)
 349                         continue;
 350                 window_set_active_pane(w, wp);
 351                 break;
 352         }
 353 }
 354
 355 struct window_pane *
 356 window_add_pane(struct window *w, u_int hlimit)
 357 {
 358         struct window_pane      *wp;
 359
 360         wp = window_pane_create(w, w->sx, w->sy, hlimit);
 361         if (TAILQ_EMPTY(&w->panes))
 362                 TAILQ_INSERT_HEAD(&w->panes, wp, entry);
 363         else
 364                 TAILQ_INSERT_AFTER(&w->panes, w->active, wp, entry);
 365         return (wp);
 366 }
 367
 368 void
 369 window_remove_pane(struct window *w, struct window_pane *wp)
 370 {
 371         w->active = TAILQ_PREV(wp, window_panes, entry);
 372         if (w->active == NULL)
 373                 w->active = TAILQ_NEXT(wp, entry);
 374
 375         TAILQ_REMOVE(&w->panes, wp, entry);
 376         window_pane_destroy(wp);
 377 }
 378
 379 struct window_pane *
 380 window_pane_at_index(struct window *w, u_int idx)
 381 {
 382         struct window_pane      *wp;
 383         u_int                    n;
 384
 385         n = 0;
 386         TAILQ_FOREACH(wp, &w->panes, entry) {
 387                 if (n == idx)
 388                         return (wp);
 389                 n++;
 390         }
 391         return (NULL);
 392 }
 393
 394 struct window_pane *
 395 window_pane_next_by_number(struct window *w, struct window_pane *wp, u_int n)
 396 {
 397         for (; n > 0; n--) {
 398                 if ((wp = TAILQ_NEXT(wp, entry)) == NULL)
 399                         wp = TAILQ_FIRST(&w->panes);
 400         }
 401
 402         return (wp);
 403 }
 404
 405 struct window_pane *
 406 window_pane_previous_by_number(struct window *w, struct window_pane *wp,
 407     u_int n)
 408 {
 409         for (; n > 0; n--) {
 410                 if ((wp = TAILQ_PREV(wp, window_panes, entry)) == NULL)
 411                         wp = TAILQ_LAST(&w->panes, window_panes);
 412         }
 413
 414         return (wp);
 415 }
 416
 417 u_int
 418 window_pane_index(struct window *w, struct window_pane *wp)
 419 {
 420         struct window_pane      *wq;
 421         u_int                    n;
 422
 423         n = 0;
 424         TAILQ_FOREACH(wq, &w->panes, entry) {
 425                 if (wp == wq)
 426                         break;
 427                 n++;
 428         }
 429         return (n);
 430 }
 431
 432 u_int
 433 window_count_panes(struct window *w)
 434 {
 435         struct window_pane      *wp;
 436         u_int                    n;
 437
 438         n = 0;
 439         TAILQ_FOREACH(wp, &w->panes, entry)
 440                 n++;
 441         return (n);
 442 }
 443
 444 void
 445 window_destroy_panes(struct window *w)
 446 {
 447         struct window_pane      *wp;
 448
 449         while (!TAILQ_EMPTY(&w->panes)) {
 450                 wp = TAILQ_FIRST(&w->panes);
 451                 TAILQ_REMOVE(&w->panes, wp, entry);
 452                 window_pane_destroy(wp);
 453         }
 454 }
 455
 456 struct window_pane *
 457 window_pane_create(struct window *w, u_int sx, u_int sy, u_int hlimit)
 458 {
 459         struct window_pane      *wp;
 460
 461         wp = xcalloc(1, sizeof *wp);
 462         wp->window = w;
 463
 464         wp->cmd = NULL;
 465         wp->shell = NULL;
 466         wp->cwd = NULL;
 467
 468         wp->fd = -1;
 469         wp->event = NULL;
 470
 471         wp->mode = NULL;
 472
 473         wp->layout_cell = NULL;
 474
 475         wp->xoff = 0;
 476         wp->yoff = 0;
 477
 478         wp->sx = sx;
 479         wp->sy = sy;
 480
 481         wp->pipe_fd = -1;
 482         wp->pipe_off = 0;
 483         wp->pipe_event = NULL;
 484
 485         wp->saved_grid = NULL;
 486
 487         screen_init(&wp->base, sx, sy, hlimit);
 488         wp->screen = &wp->base;
 489
 490         input_init(wp);
 491
 492         return (wp);
 493 }
 494
 495 void
 496 window_pane_destroy(struct window_pane *wp)
 497 {
 498         window_pane_reset_mode(wp);
 499
 500         if (wp->fd != -1) {
 501                 close(wp->fd);
 502                 bufferevent_free(wp->event);
 503         }
 504
 505         input_free(wp);
 506
 507         screen_free(&wp->base);
 508         if (wp->saved_grid != NULL)
 509                 grid_destroy(wp->saved_grid);
 510
 511         if (wp->pipe_fd != -1) {
 512                 close(wp->pipe_fd);
 513                 bufferevent_free(wp->pipe_event);
 514         }
 515
 516         if (wp->cwd != NULL)
 517                 xfree(wp->cwd);
 518         if (wp->shell != NULL)
 519                 xfree(wp->shell);
 520         if (wp->cmd != NULL)
 521                 xfree(wp->cmd);
 522         xfree(wp);
 523 }
 524
 525 int
 526 window_pane_spawn(struct window_pane *wp, const char *cmd, const char *shell,
 527     const char *cwd, struct environ *env, struct termios *tio, char **cause)
 528 {
 529         struct winsize   ws;
 530         int              mode;
 531         char            *argv0;
 532         const char      *ptr;
 533         struct termios   tio2;
 534
 535         if (wp->fd != -1) {
 536                 close(wp->fd);
 537                 bufferevent_free(wp->event);
 538         }
 539         if (cmd != NULL) {
 540                 if (wp->cmd != NULL)
 541                         xfree(wp->cmd);
 542                 wp->cmd = xstrdup(cmd);
 543         }
 544         if (shell != NULL) {
 545                 if (wp->shell != NULL)
 546                         xfree(wp->shell);
 547                 wp->shell = xstrdup(shell);
 548         }
 549         if (cwd != NULL) {
 550                 if (wp->cwd != NULL)
 551                         xfree(wp->cwd);
 552                 wp->cwd = xstrdup(cwd);
 553         }
 554
 555         memset(&ws, 0, sizeof ws);
 556         ws.ws_col = screen_size_x(&wp->base);
 557         ws.ws_row = screen_size_y(&wp->base);
 558
 559         switch (wp->pid = forkpty(&wp->fd, wp->tty, NULL, &ws)) {
 560         case -1:
 561                 wp->fd = -1;
 562                 xasprintf(cause, "%s: %s", cmd, strerror(errno));
 563                 return (-1);
 564         case 0:
 565                 if (chdir(wp->cwd) != 0)
 566                         chdir("/");
 567
 568                 if (tcgetattr(STDIN_FILENO, &tio2) != 0)
 569                         fatal("tcgetattr failed");
 570                 if (tio != NULL)
 571                         memcpy(tio2.c_cc, tio->c_cc, sizeof tio2.c_cc);
 572                 tio2.c_cc[VERASE] = '\177';
 573                 if (tcsetattr(STDIN_FILENO, TCSANOW, &tio2) != 0)
 574                         fatal("tcgetattr failed");
 575
 576                 closefrom(STDERR_FILENO + 1);
 577
 578                 environ_push(env);
 579
 580                 clear_signals(1);
 581                 log_close();
 582
 583                 if (*wp->cmd != '\0') {
 584                         /* Set SHELL but only if it is currently not useful. */
 585                         shell = getenv("SHELL");
 586                         if (shell == NULL || *shell == '\0' || areshell(shell))
 587                                 setenv("SHELL", wp->shell, 1);
 588
 589                         execl(_PATH_BSHELL, "sh", "-c", wp->cmd, (char *) NULL);
 590                         fatal("execl failed");
 591                 }
 592
 593                 /* No command; fork a login shell. */
 594                 ptr = strrchr(wp->shell, '/');
 595                 if (ptr != NULL && *(ptr + 1) != '\0')
 596                         xasprintf(&argv0, "-%s", ptr + 1);
 597                 else
 598                         xasprintf(&argv0, "-%s", wp->shell);
 599                 setenv("SHELL", wp->shell, 1);
 600                 execl(wp->shell, argv0, (char *) NULL);
 601                 fatal("execl failed");
 602         }
 603
 604         if ((mode = fcntl(wp->fd, F_GETFL)) == -1)
 605                 fatal("fcntl failed");
 606         if (fcntl(wp->fd, F_SETFL, mode|O_NONBLOCK) == -1)
 607                 fatal("fcntl failed");
 608         wp->event = bufferevent_new(wp->fd,
 609             window_pane_read_callback, NULL, window_pane_error_callback, wp);
 610         bufferevent_enable(wp->event, EV_READ|EV_WRITE);
 611
 612         return (0);
 613 }
 614
 615 /* ARGSUSED */
 616 void
 617 window_pane_read_callback(unused struct bufferevent *bufev, void *data)
 618 {
 619         struct window_pane     *wp = data;
 620         char                   *new_data;
 621         size_t                  new_size;
 622
 623         new_size = EVBUFFER_LENGTH(wp->event->input) - wp->pipe_off;
 624         if (wp->pipe_fd != -1 && new_size > 0) {
 625                 new_data = EVBUFFER_DATA(wp->event->input);
 626                 bufferevent_write(wp->pipe_event, new_data, new_size);
 627         }
 628
 629         input_parse(wp);
 630
 631         wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
 632 }
 633
 634 /* ARGSUSED */
 635 void
 636 window_pane_error_callback(
 637     unused struct bufferevent *bufev, unused short what, void *data)
 638 {
 639         struct window_pane *wp = data;
 640
 641         server_destroy_pane(wp);
 642 }
 643
 644 void
 645 window_pane_resize(struct window_pane *wp, u_int sx, u_int sy)
 646 {
 647         struct winsize  ws;
 648
 649         if (sx == wp->sx && sy == wp->sy)
 650                 return;
 651         wp->sx = sx;
 652         wp->sy = sy;
 653
 654         memset(&ws, 0, sizeof ws);
 655         ws.ws_col = sx;
 656         ws.ws_row = sy;
 657
 658         screen_resize(&wp->base, sx, sy);
 659         if (wp->mode != NULL)
 660                 wp->mode->resize(wp, sx, sy);
 661
 662         if (wp->fd != -1 && ioctl(wp->fd, TIOCSWINSZ, &ws) == -1)
 663                 fatal("ioctl failed");
 664 }
 665
 666 /*
 667  * Enter alternative screen mode. A copy of the visible screen is saved and the
 668  * history is not updated
 669  */
 670 void
 671 window_pane_alternate_on(struct window_pane *wp, struct grid_cell *gc)
 672 {
 673         struct screen   *s = &wp->base;
 674         u_int            sx, sy;
 675
 676         if (wp->saved_grid != NULL)
 677                 return;
 678         if (!options_get_number(&wp->window->options, "alternate-screen"))
 679                 return;
 680         sx = screen_size_x(s);
 681         sy = screen_size_y(s);
 682
 683         wp->saved_grid = grid_create(sx, sy, 0);
 684         grid_duplicate_lines(wp->saved_grid, 0, s->grid, screen_hsize(s), sy);
 685         wp->saved_cx = s->cx;
 686         wp->saved_cy = s->cy;
 687         memcpy(&wp->saved_cell, gc, sizeof wp->saved_cell);
 688
 689         grid_view_clear(s->grid, 0, 0, sx, sy);
 690
 691         wp->base.grid->flags &= ~GRID_HISTORY;
 692
 693         wp->flags |= PANE_REDRAW;
 694 }
 695
 696 /* Exit alternate screen mode and restore the copied grid. */
 697 void
 698 window_pane_alternate_off(struct window_pane *wp, struct grid_cell *gc)
 699 {
 700         struct screen   *s = &wp->base;
 701         u_int            sx, sy;
 702
 703         if (wp->saved_grid == NULL)
 704                 return;
 705         if (!options_get_number(&wp->window->options, "alternate-screen"))
 706                 return;
 707         sx = screen_size_x(s);
 708         sy = screen_size_y(s);
 709
 710         /*
 711          * If the current size is bigger, temporarily resize to the old size
 712          * before copying back.
 713          */
 714         if (sy > wp->saved_grid->sy)
 715                 screen_resize(s, sx, wp->saved_grid->sy);
 716
 717         /* Restore the grid, cursor position and cell. */
 718         grid_duplicate_lines(s->grid, screen_hsize(s), wp->saved_grid, 0, sy);
 719         s->cx = wp->saved_cx;
 720         if (s->cx > screen_size_x(s) - 1)
 721                 s->cx = screen_size_x(s) - 1;
 722         s->cy = wp->saved_cy;
 723         if (s->cy > screen_size_y(s) - 1)
 724                 s->cy = screen_size_y(s) - 1;
 725         memcpy(gc, &wp->saved_cell, sizeof *gc);
 726
 727         /*
 728          * Turn history back on (so resize can use it) and then resize back to
 729          * the current size.
 730          */
 731         wp->base.grid->flags |= GRID_HISTORY;
 732         if (sy > wp->saved_grid->sy)
 733                 screen_resize(s, sx, sy);
 734
 735         grid_destroy(wp->saved_grid);
 736         wp->saved_grid = NULL;
 737
 738         wp->flags |= PANE_REDRAW;
 739 }
 740
 741 int
 742 window_pane_set_mode(struct window_pane *wp, const struct window_mode *mode)
 743 {
 744         struct screen   *s;
 745
 746         if (wp->mode != NULL)
 747                 return (1);
 748         wp->mode = mode;
 749
 750         if ((s = wp->mode->init(wp)) != NULL)
 751                 wp->screen = s;
 752         wp->flags |= PANE_REDRAW;
 753         return (0);
 754 }
 755
 756 void
 757 window_pane_reset_mode(struct window_pane *wp)
 758 {
 759         if (wp->mode == NULL)
 760                 return;
 761
 762         wp->mode->free(wp);
 763         wp->mode = NULL;
 764
 765         wp->screen = &wp->base;
 766         wp->flags |= PANE_REDRAW;
 767 }
 768
 769 void
 770 window_pane_key(struct window_pane *wp, struct session *sess, int key)
 771 {
 772         struct window_pane      *wp2;
 773
 774         if (!window_pane_visible(wp))
 775                 return;
 776
 777         if (wp->mode != NULL) {
 778                 if (wp->mode->key != NULL)
 779                         wp->mode->key(wp, sess, key);
 780                 return;
 781         }
 782
 783         if (wp->fd == -1)
 784                 return;
 785         input_key(wp, key);
 786         if (options_get_number(&wp->window->options, "synchronize-panes")) {
 787                 TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 788                         if (wp2 == wp || wp2->mode != NULL)
 789                                 continue;
 790                         if (wp2->fd != -1 && window_pane_visible(wp2))
 791                                 input_key(wp2, key);
 792                 }
 793         }
 794 }
 795
 796 void
 797 window_pane_mouse(
 798     struct window_pane *wp, struct session *sess, struct mouse_event *m)
 799 {
 800         if (!window_pane_visible(wp))
 801                 return;
 802
 803         if (m->x < wp->xoff || m->x >= wp->xoff + wp->sx)
 804                 return;
 805         if (m->y < wp->yoff || m->y >= wp->yoff + wp->sy)
 806                 return;
 807         m->x -= wp->xoff;
 808         m->y -= wp->yoff;
 809
 810         if (wp->mode != NULL) {
 811                 if (wp->mode->mouse != NULL)
 812                         wp->mode->mouse(wp, sess, m);
 813         } else if (wp->fd != -1)
 814                 input_mouse(wp, m);
 815 }
 816
 817 int
 818 window_pane_visible(struct window_pane *wp)
 819 {
 820         struct window   *w = wp->window;
 821
 822         if (wp->xoff >= w->sx || wp->yoff >= w->sy)
 823                 return (0);
 824         if (wp->xoff + wp->sx > w->sx || wp->yoff + wp->sy > w->sy)
 825                 return (0);
 826         return (1);
 827 }
 828
 829 char *
 830 window_pane_search(struct window_pane *wp, const char *searchstr, u_int *lineno)
 831 {
 832         struct screen   *s = &wp->base;
 833         char            *newsearchstr, *line, *msg;
 834         u_int            i;
 835
 836         msg = NULL;
 837         xasprintf(&newsearchstr, "*%s*", searchstr);
 838
 839         for (i = 0; i < screen_size_y(s); i++) {
 840                 line = grid_view_string_cells(s->grid, 0, i, screen_size_x(s));
 841                 if (fnmatch(newsearchstr, line, 0) == 0) {
 842                         msg = line;
 843                         if (lineno != NULL)
 844                                 *lineno = i;
 845                         break;
 846                 }
 847                 xfree(line);
 848         }
 849
 850         xfree(newsearchstr);
 851         return (msg);
 852 }
 853
 854 /* Find the pane directly above another. */
 855 struct window_pane *
 856 window_pane_find_up(struct window_pane *wp)
 857 {
 858         struct window_pane     *wp2;
 859         u_int                   left, top;
 860
 861         if (wp == NULL || !window_pane_visible(wp))
 862                 return (NULL);
 863
 864         top = wp->yoff;
 865         if (top == 0)
 866                 top = wp->window->sy + 1;
 867         left = wp->xoff;
 868
 869         TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 870                 if (!window_pane_visible(wp2))
 871                         continue;
 872                 if (wp2->yoff + wp2->sy + 1 != top)
 873                         continue;
 874                 if (left >= wp2->xoff && left <= wp2->xoff + wp2->sx)
 875                         return (wp2);
 876         }
 877         return (NULL);
 878 }
 879
 880 /* Find the pane directly below another. */
 881 struct window_pane *
 882 window_pane_find_down(struct window_pane *wp)
 883 {
 884         struct window_pane     *wp2;
 885         u_int                   left, bottom;
 886
 887         if (wp == NULL || !window_pane_visible(wp))
 888                 return (NULL);
 889
 890         bottom = wp->yoff + wp->sy + 1;
 891         if (bottom >= wp->window->sy)
 892                 bottom = 0;
 893         left = wp->xoff;
 894
 895         TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 896                 if (!window_pane_visible(wp2))
 897                         continue;
 898                 if (wp2->yoff != bottom)
 899                         continue;
 900                 if (left >= wp2->xoff && left <= wp2->xoff + wp2->sx)
 901                         return (wp2);
 902         }
 903         return (NULL);
 904 }
 905
 906 /*
 907  * Find the pane directly to the left of another, adjacent to the left side and
 908  * containing the top edge.
 909  */
 910 struct window_pane *
 911 window_pane_find_left(struct window_pane *wp)
 912 {
 913         struct window_pane     *wp2;
 914         u_int                   left, top;
 915
 916         if (wp == NULL || !window_pane_visible(wp))
 917                 return (NULL);
 918
 919         left = wp->xoff;
 920         if (left == 0)
 921                 left = wp->window->sx + 1;
 922         top = wp->yoff;
 923
 924         TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 925                 if (!window_pane_visible(wp2))
 926                         continue;
 927                 if (wp2->xoff + wp2->sx + 1 != left)
 928                         continue;
 929                 if (top >= wp2->yoff && top <= wp2->yoff + wp2->sy)
 930                         return (wp2);
 931         }
 932         return (NULL);
 933 }
 934
 935 /*
 936  * Find the pane directly to the right of another, that is adjacent to the
 937  * right edge and including the top edge.
 938  */
 939 struct window_pane *
 940 window_pane_find_right(struct window_pane *wp)
 941 {
 942         struct window_pane     *wp2;
 943         u_int                   right, top;
 944
 945         if (wp == NULL || !window_pane_visible(wp))
 946                 return (NULL);
 947
 948         right = wp->xoff + wp->sx + 1;
 949         if (right >= wp->window->sx)
 950                 right = 0;
 951         top = wp->yoff;
 952
 953         TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 954                 if (!window_pane_visible(wp2))
 955                         continue;
 956                 if (wp2->xoff != right)
 957                         continue;
 958                 if (top >= wp2->yoff && top <= wp2->yoff + wp2->sy)
 959                         return (wp2);
 960         }
 961         return (NULL);
 962 }