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 /* Global panes tree. */
  60 struct window_pane_tree all_window_panes;
  61 u_int   next_window_pane;
  62
  63 void    window_pane_read_callback(struct bufferevent *, void *);
  64 void    window_pane_error_callback(struct bufferevent *, short, void *);
  65
  66 RB_GENERATE(winlinks, winlink, entry, winlink_cmp);
  67
  68 int
  69 winlink_cmp(struct winlink *wl1, struct winlink *wl2)
  70 {
  71         return (wl1->idx - wl2->idx);
  72 }
  73
  74 RB_GENERATE(window_pane_tree, window_pane, tree_entry, window_pane_cmp);
  75
  76 int
  77 window_pane_cmp(struct window_pane *wp1, struct window_pane *wp2)
  78 {
  79         return (wp1->id - wp2->id);
  80 }
  81
  82 struct winlink *
  83 winlink_find_by_window(struct winlinks *wwl, struct window *w)
  84 {
  85         struct winlink  *wl;
  86
  87         RB_FOREACH(wl, winlinks, wwl) {
  88                 if (wl->window == w)
  89                         return (wl);
  90         }
  91
  92         return (NULL);
  93 }
  94
  95 struct winlink *
  96 winlink_find_by_index(struct winlinks *wwl, int idx)
  97 {
  98         struct winlink  wl;
  99
 100         if (idx < 0)
 101                 fatalx("bad index");
 102
 103         wl.idx = idx;
 104         return (RB_FIND(winlinks, wwl, &wl));
 105 }
 106
 107 int
 108 winlink_next_index(struct winlinks *wwl, int idx)
 109 {
 110         int     i;
 111
 112         i = idx;
 113         do {
 114                 if (winlink_find_by_index(wwl, i) == NULL)
 115                         return (i);
 116                 if (i == INT_MAX)
 117                         i = 0;
 118                 else
 119                         i++;
 120         } while (i != idx);
 121         return (-1);
 122 }
 123
 124 u_int
 125 winlink_count(struct winlinks *wwl)
 126 {
 127         struct winlink  *wl;
 128         u_int            n;
 129
 130         n = 0;
 131         RB_FOREACH(wl, winlinks, wwl)
 132                 n++;
 133
 134         return (n);
 135 }
 136
 137 struct winlink *
 138 winlink_add(struct winlinks *wwl, int idx)
 139 {
 140         struct winlink  *wl;
 141
 142         if (idx < 0) {
 143                 if ((idx = winlink_next_index(wwl, -idx - 1)) == -1)
 144                         return (NULL);
 145         } else if (winlink_find_by_index(wwl, idx) != NULL)
 146                 return (NULL);
 147
 148         wl = xcalloc(1, sizeof *wl);
 149         wl->idx = idx;
 150         RB_INSERT(winlinks, wwl, wl);
 151
 152         return (wl);
 153 }
 154
 155 void
 156 winlink_set_window(struct winlink *wl, struct window *w)
 157 {
 158         wl->window = w;
 159         w->references++;
 160 }
 161
 162 void
 163 winlink_remove(struct winlinks *wwl, struct winlink *wl)
 164 {
 165         struct window   *w = wl->window;
 166
 167         RB_REMOVE(winlinks, wwl, wl);
 168         if (wl->status_text != NULL)
 169                 xfree(wl->status_text);
 170         xfree(wl);
 171
 172         if (w != NULL) {
 173                 if (w->references == 0)
 174                         fatal("bad reference count");
 175                 w->references--;
 176                 if (w->references == 0)
 177                         window_destroy(w);
 178         }
 179 }
 180
 181 struct winlink *
 182 winlink_next(struct winlink *wl)
 183 {
 184         return (RB_NEXT(winlinks, wwl, wl));
 185 }
 186
 187 struct winlink *
 188 winlink_previous(struct winlink *wl)
 189 {
 190         return (RB_PREV(winlinks, wwl, wl));
 191 }
 192
 193 struct winlink *
 194 winlink_next_by_number(struct winlink *wl, struct session *s, int n)
 195 {
 196         for (; n > 0; n--) {
 197                 if ((wl = RB_NEXT(winlinks, wwl, wl)) == NULL)
 198                         wl = RB_MIN(winlinks, &s->windows);
 199         }
 200
 201         return (wl);
 202 }
 203
 204 struct winlink *
 205 winlink_previous_by_number(struct winlink *wl, struct session *s, int n)
 206 {
 207         for (; n > 0; n--) {
 208                 if ((wl = RB_PREV(winlinks, wwl, wl)) == NULL)
 209                         wl = RB_MAX(winlinks, &s->windows);
 210         }
 211
 212         return (wl);
 213 }
 214
 215 void
 216 winlink_stack_push(struct winlink_stack *stack, struct winlink *wl)
 217 {
 218         if (wl == NULL)
 219                 return;
 220
 221         winlink_stack_remove(stack, wl);
 222         TAILQ_INSERT_HEAD(stack, wl, sentry);
 223 }
 224
 225 void
 226 winlink_stack_remove(struct winlink_stack *stack, struct winlink *wl)
 227 {
 228         struct winlink  *wl2;
 229
 230         if (wl == NULL)
 231                 return;
 232
 233         TAILQ_FOREACH(wl2, stack, sentry) {
 234                 if (wl2 == wl) {
 235                         TAILQ_REMOVE(stack, wl, sentry);
 236                         return;
 237                 }
 238         }
 239 }
 240
 241 int
 242 window_index(struct window *s, u_int *i)
 243 {
 244         for (*i = 0; *i < ARRAY_LENGTH(&windows); (*i)++) {
 245                 if (s == ARRAY_ITEM(&windows, *i))
 246                         return (0);
 247         }
 248         return (-1);
 249 }
 250
 251 struct window *
 252 window_create1(u_int sx, u_int sy)
 253 {
 254         struct window   *w;
 255         u_int            i;
 256
 257         w = xcalloc(1, sizeof *w);
 258         w->name = NULL;
 259         w->flags = 0;
 260
 261         TAILQ_INIT(&w->panes);
 262         w->active = NULL;
 263
 264         w->lastlayout = -1;
 265         w->layout_root = NULL;
 266
 267         w->sx = sx;
 268         w->sy = sy;
 269
 270         queue_window_name(w);
 271
 272         options_init(&w->options, &global_w_options);
 273
 274         for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
 275                 if (ARRAY_ITEM(&windows, i) == NULL) {
 276                         ARRAY_SET(&windows, i, w);
 277                         break;
 278                 }
 279         }
 280         if (i == ARRAY_LENGTH(&windows))
 281                 ARRAY_ADD(&windows, w);
 282         w->references = 0;
 283
 284         return (w);
 285 }
 286
 287 struct window *
 288 window_create(const char *name, const char *cmd, const char *shell,
 289     const char *cwd, struct environ *env, struct termios *tio,
 290     u_int sx, u_int sy, u_int hlimit,char **cause)
 291 {
 292         struct window           *w;
 293         struct window_pane      *wp;
 294
 295         w = window_create1(sx, sy);
 296         wp = window_add_pane(w, hlimit);
 297         layout_init(w);
 298         if (window_pane_spawn(wp, cmd, shell, cwd, env, tio, cause) != 0) {
 299                 window_destroy(w);
 300                 return (NULL);
 301         }
 302         w->active = TAILQ_FIRST(&w->panes);
 303         if (name != NULL) {
 304                 w->name = xstrdup(name);
 305                 options_set_number(&w->options, "automatic-rename", 0);
 306         } else
 307                 w->name = default_window_name(w);
 308         return (w);
 309 }
 310
 311 void
 312 window_destroy(struct window *w)
 313 {
 314         u_int   i;
 315
 316         if (window_index(w, &i) != 0)
 317                 fatalx("index not found");
 318         ARRAY_SET(&windows, i, NULL);
 319         while (!ARRAY_EMPTY(&windows) && ARRAY_LAST(&windows) == NULL)
 320                 ARRAY_TRUNC(&windows, 1);
 321
 322         if (w->layout_root != NULL)
 323                 layout_free(w);
 324
 325         evtimer_del(&w->name_timer);
 326
 327         options_free(&w->options);
 328
 329         window_destroy_panes(w);
 330
 331         if (w->name != NULL)
 332                 xfree(w->name);
 333         xfree(w);
 334 }
 335
 336 void
 337 window_resize(struct window *w, u_int sx, u_int sy)
 338 {
 339         w->sx = sx;
 340         w->sy = sy;
 341 }
 342
 343 void
 344 window_set_active_pane(struct window *w, struct window_pane *wp)
 345 {
 346         if (wp == w->active)
 347                 return;
 348         w->last = w->active;
 349         w->active = wp;
 350         while (!window_pane_visible(w->active)) {
 351                 w->active = TAILQ_PREV(w->active, window_panes, entry);
 352                 if (w->active == NULL)
 353                         w->active = TAILQ_LAST(&w->panes, window_panes);
 354                 if (w->active == wp)
 355                         return;
 356         }
 357 }
 358
 359 void
 360 window_set_active_at(struct window *w, u_int x, u_int y)
 361 {
 362         struct window_pane      *wp;
 363
 364         TAILQ_FOREACH(wp, &w->panes, entry) {
 365                 if (wp == w->active || !window_pane_visible(wp))
 366                         continue;
 367                 if (x < wp->xoff || x >= wp->xoff + wp->sx)
 368                         continue;
 369                 if (y < wp->yoff || y >= wp->yoff + wp->sy)
 370                         continue;
 371                 window_set_active_pane(w, wp);
 372                 break;
 373         }
 374 }
 375
 376 struct window_pane *
 377 window_add_pane(struct window *w, u_int hlimit)
 378 {
 379         struct window_pane      *wp;
 380
 381         wp = window_pane_create(w, w->sx, w->sy, hlimit);
 382         if (TAILQ_EMPTY(&w->panes))
 383                 TAILQ_INSERT_HEAD(&w->panes, wp, entry);
 384         else
 385                 TAILQ_INSERT_AFTER(&w->panes, w->active, wp, entry);
 386         return (wp);
 387 }
 388
 389 void
 390 window_remove_pane(struct window *w, struct window_pane *wp)
 391 {
 392         if (wp == w->active) {
 393                 w->active = w->last;
 394                 w->last = NULL;
 395                 if (w->active == NULL) {
 396                         w->active = TAILQ_PREV(wp, window_panes, entry);
 397                         if (w->active == NULL)
 398                                 w->active = TAILQ_NEXT(wp, entry);
 399                 }
 400         } else if (wp == w->last)
 401                 w->last = NULL;
 402
 403         TAILQ_REMOVE(&w->panes, wp, entry);
 404         window_pane_destroy(wp);
 405 }
 406
 407 struct window_pane *
 408 window_pane_at_index(struct window *w, u_int idx)
 409 {
 410         struct window_pane      *wp;
 411         u_int                    n;
 412
 413         n = 0;
 414         TAILQ_FOREACH(wp, &w->panes, entry) {
 415                 if (n == idx)
 416                         return (wp);
 417                 n++;
 418         }
 419         return (NULL);
 420 }
 421
 422 struct window_pane *
 423 window_pane_next_by_number(struct window *w, struct window_pane *wp, u_int n)
 424 {
 425         for (; n > 0; n--) {
 426                 if ((wp = TAILQ_NEXT(wp, entry)) == NULL)
 427                         wp = TAILQ_FIRST(&w->panes);
 428         }
 429
 430         return (wp);
 431 }
 432
 433 struct window_pane *
 434 window_pane_previous_by_number(struct window *w, struct window_pane *wp,
 435     u_int n)
 436 {
 437         for (; n > 0; n--) {
 438                 if ((wp = TAILQ_PREV(wp, window_panes, entry)) == NULL)
 439                         wp = TAILQ_LAST(&w->panes, window_panes);
 440         }
 441
 442         return (wp);
 443 }
 444
 445 u_int
 446 window_pane_index(struct window *w, struct window_pane *wp)
 447 {
 448         struct window_pane      *wq;
 449         u_int                    n;
 450
 451         n = 0;
 452         TAILQ_FOREACH(wq, &w->panes, entry) {
 453                 if (wp == wq)
 454                         break;
 455                 n++;
 456         }
 457         return (n);
 458 }
 459
 460 u_int
 461 window_count_panes(struct window *w)
 462 {
 463         struct window_pane      *wp;
 464         u_int                    n;
 465
 466         n = 0;
 467         TAILQ_FOREACH(wp, &w->panes, entry)
 468                 n++;
 469         return (n);
 470 }
 471
 472 void
 473 window_destroy_panes(struct window *w)
 474 {
 475         struct window_pane      *wp;
 476
 477         while (!TAILQ_EMPTY(&w->panes)) {
 478                 wp = TAILQ_FIRST(&w->panes);
 479                 TAILQ_REMOVE(&w->panes, wp, entry);
 480                 window_pane_destroy(wp);
 481         }
 482 }
 483
 484 /* Return list of printable window flag symbols. No flags is just a space. */
 485 char *
 486 window_printable_flags(struct session *s, struct winlink *wl)
 487 {
 488         char    flags[BUFSIZ];
 489         int     pos;
 490
 491         pos = 0;
 492         if (wl->flags & WINLINK_ACTIVITY)
 493                 flags[pos++] = '#';
 494         if (wl->flags & WINLINK_BELL)
 495                 flags[pos++] = '!';
 496         if (wl->flags & WINLINK_CONTENT)
 497                 flags[pos++] = '+';
 498         if (wl->flags & WINLINK_SILENCE)
 499                 flags[pos++] = '~';
 500         if (wl == s->curw)
 501                 flags[pos++] = '*';
 502         if (wl == TAILQ_FIRST(&s->lastw))
 503                 flags[pos++] = '-';
 504         if (pos == 0)
 505                 flags[pos++] = ' ';
 506         flags[pos] = '\0';
 507         return (xstrdup(flags));
 508 }
 509
 510 /* Find pane in global tree by id. */
 511 struct window_pane *
 512 window_pane_find_by_id(u_int id)
 513 {
 514         struct window_pane      wp;
 515
 516         wp.id = id;
 517         return (RB_FIND(window_pane_tree, &all_window_panes, &wp));
 518 }
 519
 520 struct window_pane *
 521 window_pane_create(struct window *w, u_int sx, u_int sy, u_int hlimit)
 522 {
 523         struct window_pane      *wp;
 524
 525         wp = xcalloc(1, sizeof *wp);
 526         wp->window = w;
 527
 528         wp->id = next_window_pane++;
 529         RB_INSERT(window_pane_tree, &all_window_panes, wp);
 530
 531         wp->cmd = NULL;
 532         wp->shell = NULL;
 533         wp->cwd = NULL;
 534
 535         wp->fd = -1;
 536         wp->event = NULL;
 537
 538         wp->mode = NULL;
 539
 540         wp->layout_cell = NULL;
 541
 542         wp->xoff = 0;
 543         wp->yoff = 0;
 544
 545         wp->sx = sx;
 546         wp->sy = sy;
 547
 548         wp->pipe_fd = -1;
 549         wp->pipe_off = 0;
 550         wp->pipe_event = NULL;
 551
 552         wp->saved_grid = NULL;
 553
 554         screen_init(&wp->base, sx, sy, hlimit);
 555         wp->screen = &wp->base;
 556
 557         input_init(wp);
 558
 559         return (wp);
 560 }
 561
 562 void
 563 window_pane_destroy(struct window_pane *wp)
 564 {
 565         window_pane_reset_mode(wp);
 566
 567         if (wp->fd != -1) {
 568                 close(wp->fd);
 569                 bufferevent_free(wp->event);
 570         }
 571
 572         input_free(wp);
 573
 574         screen_free(&wp->base);
 575         if (wp->saved_grid != NULL)
 576                 grid_destroy(wp->saved_grid);
 577
 578         if (wp->pipe_fd != -1) {
 579                 close(wp->pipe_fd);
 580                 bufferevent_free(wp->pipe_event);
 581         }
 582
 583         RB_REMOVE(window_pane_tree, &all_window_panes, wp);
 584
 585         if (wp->cwd != NULL)
 586                 xfree(wp->cwd);
 587         if (wp->shell != NULL)
 588                 xfree(wp->shell);
 589         if (wp->cmd != NULL)
 590                 xfree(wp->cmd);
 591         xfree(wp);
 592 }
 593
 594 int
 595 window_pane_spawn(struct window_pane *wp, const char *cmd, const char *shell,
 596     const char *cwd, struct environ *env, struct termios *tio, char **cause)
 597 {
 598         struct winsize   ws;
 599         char            *argv0, paneid[16];
 600         const char      *ptr;
 601         struct termios   tio2;
 602
 603         if (wp->fd != -1) {
 604                 close(wp->fd);
 605                 bufferevent_free(wp->event);
 606         }
 607         if (cmd != NULL) {
 608                 if (wp->cmd != NULL)
 609                         xfree(wp->cmd);
 610                 wp->cmd = xstrdup(cmd);
 611         }
 612         if (shell != NULL) {
 613                 if (wp->shell != NULL)
 614                         xfree(wp->shell);
 615                 wp->shell = xstrdup(shell);
 616         }
 617         if (cwd != NULL) {
 618                 if (wp->cwd != NULL)
 619                         xfree(wp->cwd);
 620                 wp->cwd = xstrdup(cwd);
 621         }
 622
 623         memset(&ws, 0, sizeof ws);
 624         ws.ws_col = screen_size_x(&wp->base);
 625         ws.ws_row = screen_size_y(&wp->base);
 626
 627         switch (wp->pid = forkpty(&wp->fd, wp->tty, NULL, &ws)) {
 628         case -1:
 629                 wp->fd = -1;
 630                 xasprintf(cause, "%s: %s", cmd, strerror(errno));
 631                 return (-1);
 632         case 0:
 633                 if (chdir(wp->cwd) != 0)
 634                         chdir("/");
 635
 636                 if (tcgetattr(STDIN_FILENO, &tio2) != 0)
 637                         fatal("tcgetattr failed");
 638                 if (tio != NULL)
 639                         memcpy(tio2.c_cc, tio->c_cc, sizeof tio2.c_cc);
 640                 tio2.c_cc[VERASE] = '\177';
 641                 if (tcsetattr(STDIN_FILENO, TCSANOW, &tio2) != 0)
 642                         fatal("tcgetattr failed");
 643
 644                 closefrom(STDERR_FILENO + 1);
 645
 646                 xsnprintf(paneid, sizeof paneid, "%%%u", wp->id);
 647                 environ_set(env, "TMUX_PANE", paneid);
 648                 environ_push(env);
 649
 650                 clear_signals(1);
 651                 log_close();
 652
 653                 if (*wp->cmd != '\0') {
 654                         /* Set SHELL but only if it is currently not useful. */
 655                         shell = getenv("SHELL");
 656                         if (shell == NULL || *shell == '\0' || areshell(shell))
 657                                 setenv("SHELL", wp->shell, 1);
 658
 659                         execl(_PATH_BSHELL, "sh", "-c", wp->cmd, (char *) NULL);
 660                         fatal("execl failed");
 661                 }
 662
 663                 /* No command; fork a login shell. */
 664                 ptr = strrchr(wp->shell, '/');
 665                 if (ptr != NULL && *(ptr + 1) != '\0')
 666                         xasprintf(&argv0, "-%s", ptr + 1);
 667                 else
 668                         xasprintf(&argv0, "-%s", wp->shell);
 669                 setenv("SHELL", wp->shell, 1);
 670                 execl(wp->shell, argv0, (char *) NULL);
 671                 fatal("execl failed");
 672         }
 673
 674         setblocking(wp->fd, 0);
 675
 676         wp->event = bufferevent_new(wp->fd,
 677             window_pane_read_callback, NULL, window_pane_error_callback, wp);
 678         bufferevent_enable(wp->event, EV_READ|EV_WRITE);
 679
 680         return (0);
 681 }
 682
 683 /* ARGSUSED */
 684 void
 685 window_pane_read_callback(unused struct bufferevent *bufev, void *data)
 686 {
 687         struct window_pane     *wp = data;
 688         char                   *new_data;
 689         size_t                  new_size;
 690
 691         new_size = EVBUFFER_LENGTH(wp->event->input) - wp->pipe_off;
 692         if (wp->pipe_fd != -1 && new_size > 0) {
 693                 new_data = EVBUFFER_DATA(wp->event->input);
 694                 bufferevent_write(wp->pipe_event, new_data, new_size);
 695         }
 696
 697         input_parse(wp);
 698
 699         wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
 700
 701         /*
 702          * If we get here, we're not outputting anymore, so set the silence
 703          * flag on the window.
 704          */
 705         wp->window->flags |= WINDOW_SILENCE;
 706         if (gettimeofday(&wp->window->silence_timer, NULL) != 0)
 707                 fatal("gettimeofday failed.");
 708 }
 709
 710 /* ARGSUSED */
 711 void
 712 window_pane_error_callback(
 713     unused struct bufferevent *bufev, unused short what, void *data)
 714 {
 715         struct window_pane *wp = data;
 716
 717         server_destroy_pane(wp);
 718 }
 719
 720 void
 721 window_pane_resize(struct window_pane *wp, u_int sx, u_int sy)
 722 {
 723         struct winsize  ws;
 724
 725         if (sx == wp->sx && sy == wp->sy)
 726                 return;
 727         wp->sx = sx;
 728         wp->sy = sy;
 729
 730         memset(&ws, 0, sizeof ws);
 731         ws.ws_col = sx;
 732         ws.ws_row = sy;
 733
 734         screen_resize(&wp->base, sx, sy);
 735         if (wp->mode != NULL)
 736                 wp->mode->resize(wp, sx, sy);
 737
 738         if (wp->fd != -1 && ioctl(wp->fd, TIOCSWINSZ, &ws) == -1)
 739                 fatal("ioctl failed");
 740 }
 741
 742 /*
 743  * Enter alternative screen mode. A copy of the visible screen is saved and the
 744  * history is not updated
 745  */
 746 void
 747 window_pane_alternate_on(struct window_pane *wp, struct grid_cell *gc)
 748 {
 749         struct screen   *s = &wp->base;
 750         u_int            sx, sy;
 751
 752         if (wp->saved_grid != NULL)
 753                 return;
 754         if (!options_get_number(&wp->window->options, "alternate-screen"))
 755                 return;
 756         sx = screen_size_x(s);
 757         sy = screen_size_y(s);
 758
 759         wp->saved_grid = grid_create(sx, sy, 0);
 760         grid_duplicate_lines(wp->saved_grid, 0, s->grid, screen_hsize(s), sy);
 761         wp->saved_cx = s->cx;
 762         wp->saved_cy = s->cy;
 763         memcpy(&wp->saved_cell, gc, sizeof wp->saved_cell);
 764
 765         grid_view_clear(s->grid, 0, 0, sx, sy);
 766
 767         wp->base.grid->flags &= ~GRID_HISTORY;
 768
 769         wp->flags |= PANE_REDRAW;
 770 }
 771
 772 /* Exit alternate screen mode and restore the copied grid. */
 773 void
 774 window_pane_alternate_off(struct window_pane *wp, struct grid_cell *gc)
 775 {
 776         struct screen   *s = &wp->base;
 777         u_int            sx, sy;
 778
 779         if (wp->saved_grid == NULL)
 780                 return;
 781         if (!options_get_number(&wp->window->options, "alternate-screen"))
 782                 return;
 783         sx = screen_size_x(s);
 784         sy = screen_size_y(s);
 785
 786         /*
 787          * If the current size is bigger, temporarily resize to the old size
 788          * before copying back.
 789          */
 790         if (sy > wp->saved_grid->sy)
 791                 screen_resize(s, sx, wp->saved_grid->sy);
 792
 793         /* Restore the grid, cursor position and cell. */
 794         grid_duplicate_lines(s->grid, screen_hsize(s), wp->saved_grid, 0, sy);
 795         s->cx = wp->saved_cx;
 796         if (s->cx > screen_size_x(s) - 1)
 797                 s->cx = screen_size_x(s) - 1;
 798         s->cy = wp->saved_cy;
 799         if (s->cy > screen_size_y(s) - 1)
 800                 s->cy = screen_size_y(s) - 1;
 801         memcpy(gc, &wp->saved_cell, sizeof *gc);
 802
 803         /*
 804          * Turn history back on (so resize can use it) and then resize back to
 805          * the current size.
 806          */
 807         wp->base.grid->flags |= GRID_HISTORY;
 808         if (sy > wp->saved_grid->sy)
 809                 screen_resize(s, sx, sy);
 810
 811         grid_destroy(wp->saved_grid);
 812         wp->saved_grid = NULL;
 813
 814         wp->flags |= PANE_REDRAW;
 815 }
 816
 817 int
 818 window_pane_set_mode(struct window_pane *wp, const struct window_mode *mode)
 819 {
 820         struct screen   *s;
 821
 822         if (wp->mode != NULL)
 823                 return (1);
 824         wp->mode = mode;
 825
 826         if ((s = wp->mode->init(wp)) != NULL)
 827                 wp->screen = s;
 828         wp->flags |= PANE_REDRAW;
 829         return (0);
 830 }
 831
 832 void
 833 window_pane_reset_mode(struct window_pane *wp)
 834 {
 835         if (wp->mode == NULL)
 836                 return;
 837
 838         wp->mode->free(wp);
 839         wp->mode = NULL;
 840
 841         wp->screen = &wp->base;
 842         wp->flags |= PANE_REDRAW;
 843 }
 844
 845 void
 846 window_pane_key(struct window_pane *wp, struct session *sess, int key)
 847 {
 848         struct window_pane      *wp2;
 849
 850         if (!window_pane_visible(wp))
 851                 return;
 852
 853         if (wp->mode != NULL) {
 854                 if (wp->mode->key != NULL)
 855                         wp->mode->key(wp, sess, key);
 856                 return;
 857         }
 858
 859         if (wp->fd == -1)
 860                 return;
 861         input_key(wp, key);
 862         if (options_get_number(&wp->window->options, "synchronize-panes")) {
 863                 TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 864                         if (wp2 == wp || wp2->mode != NULL)
 865                                 continue;
 866                         if (wp2->fd != -1 && window_pane_visible(wp2))
 867                                 input_key(wp2, key);
 868                 }
 869         }
 870 }
 871
 872 void
 873 window_pane_mouse(
 874     struct window_pane *wp, struct session *sess, struct mouse_event *m)
 875 {
 876         if (!window_pane_visible(wp))
 877                 return;
 878
 879         if (m->x < wp->xoff || m->x >= wp->xoff + wp->sx)
 880                 return;
 881         if (m->y < wp->yoff || m->y >= wp->yoff + wp->sy)
 882                 return;
 883         m->x -= wp->xoff;
 884         m->y -= wp->yoff;
 885
 886         if (wp->mode != NULL) {
 887                 if (wp->mode->mouse != NULL &&
 888                     options_get_number(&wp->window->options, "mode-mouse"))
 889                         wp->mode->mouse(wp, sess, m);
 890         } else if (wp->fd != -1)
 891                 input_mouse(wp, m);
 892 }
 893
 894 int
 895 window_pane_visible(struct window_pane *wp)
 896 {
 897         struct window   *w = wp->window;
 898
 899         if (wp->xoff >= w->sx || wp->yoff >= w->sy)
 900                 return (0);
 901         if (wp->xoff + wp->sx > w->sx || wp->yoff + wp->sy > w->sy)
 902                 return (0);
 903         return (1);
 904 }
 905
 906 char *
 907 window_pane_search(struct window_pane *wp, const char *searchstr, u_int *lineno)
 908 {
 909         struct screen   *s = &wp->base;
 910         char            *newsearchstr, *line, *msg;
 911         u_int            i;
 912
 913         msg = NULL;
 914         xasprintf(&newsearchstr, "*%s*", searchstr);
 915
 916         for (i = 0; i < screen_size_y(s); i++) {
 917                 line = grid_view_string_cells(s->grid, 0, i, screen_size_x(s));
 918                 if (fnmatch(newsearchstr, line, 0) == 0) {
 919                         msg = line;
 920                         if (lineno != NULL)
 921                                 *lineno = i;
 922                         break;
 923                 }
 924                 xfree(line);
 925         }
 926
 927         xfree(newsearchstr);
 928         return (msg);
 929 }
 930
 931 /* Find the pane directly above another. */
 932 struct window_pane *
 933 window_pane_find_up(struct window_pane *wp)
 934 {
 935         struct window_pane     *wp2;
 936         u_int                   left, top;
 937
 938         if (wp == NULL || !window_pane_visible(wp))
 939                 return (NULL);
 940
 941         top = wp->yoff;
 942         if (top == 0)
 943                 top = wp->window->sy + 1;
 944         left = wp->xoff;
 945
 946         TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 947                 if (!window_pane_visible(wp2))
 948                         continue;
 949                 if (wp2->yoff + wp2->sy + 1 != top)
 950                         continue;
 951                 if (left >= wp2->xoff && left <= wp2->xoff + wp2->sx)
 952                         return (wp2);
 953         }
 954         return (NULL);
 955 }
 956
 957 /* Find the pane directly below another. */
 958 struct window_pane *
 959 window_pane_find_down(struct window_pane *wp)
 960 {
 961         struct window_pane     *wp2;
 962         u_int                   left, bottom;
 963
 964         if (wp == NULL || !window_pane_visible(wp))
 965                 return (NULL);
 966
 967         bottom = wp->yoff + wp->sy + 1;
 968         if (bottom >= wp->window->sy)
 969                 bottom = 0;
 970         left = wp->xoff;
 971
 972         TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 973                 if (!window_pane_visible(wp2))
 974                         continue;
 975                 if (wp2->yoff != bottom)
 976                         continue;
 977                 if (left >= wp2->xoff && left <= wp2->xoff + wp2->sx)
 978                         return (wp2);
 979         }
 980         return (NULL);
 981 }
 982
 983 /*
 984  * Find the pane directly to the left of another, adjacent to the left side and
 985  * containing the top edge.
 986  */
 987 struct window_pane *
 988 window_pane_find_left(struct window_pane *wp)
 989 {
 990         struct window_pane     *wp2;
 991         u_int                   left, top;
 992
 993         if (wp == NULL || !window_pane_visible(wp))
 994                 return (NULL);
 995
 996         left = wp->xoff;
 997         if (left == 0)
 998                 left = wp->window->sx + 1;
 999         top = wp->yoff;
1000
1001         TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
1002                 if (!window_pane_visible(wp2))
1003                         continue;
1004                 if (wp2->xoff + wp2->sx + 1 != left)
1005                         continue;
1006                 if (top >= wp2->yoff && top <= wp2->yoff + wp2->sy)
1007                         return (wp2);
1008         }
1009         return (NULL);
1010 }
1011
1012 /*
1013  * Find the pane directly to the right of another, that is adjacent to the
1014  * right edge and including the top edge.
1015  */
1016 struct window_pane *
1017 window_pane_find_right(struct window_pane *wp)
1018 {
1019         struct window_pane     *wp2;
1020         u_int                   right, top;
1021
1022         if (wp == NULL || !window_pane_visible(wp))
1023                 return (NULL);
1024
1025         right = wp->xoff + wp->sx + 1;
1026         if (right >= wp->window->sx)
1027                 right = 0;
1028         top = wp->yoff;
1029
1030         TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
1031                 if (!window_pane_visible(wp2))
1032                         continue;
1033                 if (wp2->xoff != right)
1034                         continue;
1035                 if (top >= wp2->yoff && top <= wp2->yoff + wp2->sy)
1036                         return (wp2);
1037         }
1038         return (NULL);
1039 }