gdb/tui/tui.c

   1 /* General functions for the WDB TUI.
   2
   3    Copyright (C) 1998-2019 Free Software Foundation, Inc.
   4
   5    Contributed by Hewlett-Packard Company.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "defs.h"
  23 #include "gdbcmd.h"
  24 #include "tui/tui.h"
  25 #include "tui/tui-hooks.h"
  26 #include "tui/tui-data.h"
  27 #include "tui/tui-layout.h"
  28 #include "tui/tui-io.h"
  29 #include "tui/tui-regs.h"
  30 #include "tui/tui-stack.h"
  31 #include "tui/tui-win.h"
  32 #include "tui/tui-winsource.h"
  33 #include "tui/tui-windata.h"
  34 #include "target.h"
  35 #include "frame.h"
  36 #include "breakpoint.h"
  37 #include "inferior.h"
  38 #include "symtab.h"
  39 #include "source.h"
  40 #include "terminal.h"
  41 #include "top.h"
  42
  43 #include <ctype.h>
  44 #include <signal.h>
  45 #include <fcntl.h>
  46 #if 0
  47 #include <termio.h>
  48 #endif
  49 #include <setjmp.h>
  50
  51 #include "gdb_curses.h"
  52 #include "interps.h"
  53
  54 /* This redefines CTRL if it is not already defined, so it must come
  55    after terminal state releated include files like <term.h> and
  56    "gdb_curses.h".  */
  57 #include "readline/readline.h"
  58
  59 /* Tells whether the TUI is active or not.  */
  60 int tui_active = 0;
  61 static int tui_finish_init = 1;
  62
  63 enum tui_key_mode tui_current_key_mode = TUI_COMMAND_MODE;
  64
  65 struct tui_char_command
  66 {
  67   unsigned char key;
  68   const char *cmd;
  69 };
  70
  71 /* Key mapping to gdb commands when the TUI is using the single key
  72    mode.  */
  73 static const struct tui_char_command tui_commands[] = {
  74   { 'c', "continue" },
  75   { 'd', "down" },
  76   { 'f', "finish" },
  77   { 'n', "next" },
  78   { 'o', "nexti" },
  79   { 'r', "run" },
  80   { 's', "step" },
  81   { 'i', "stepi" },
  82   { 'u', "up" },
  83   { 'v', "info locals" },
  84   { 'w', "where" },
  85   { 0, 0 },
  86 };
  87
  88 static Keymap tui_keymap;
  89 static Keymap tui_readline_standard_keymap;
  90
  91 /* TUI readline command.
  92    Switch the output mode between TUI/standard gdb.  */
  93 static int
  94 tui_rl_switch_mode (int notused1, int notused2)
  95 {
  96
  97   /* Don't let exceptions escape.  We're in the middle of a readline
  98      callback that isn't prepared for that.  */
  99   try
 100     {
 101       if (tui_active)
 102         {
 103           tui_disable ();
 104           rl_prep_terminal (0);
 105         }
 106       else
 107         {
 108           /* If tui_enable throws, we'll re-prep below.  */
 109           rl_deprep_terminal ();
 110           tui_enable ();
 111         }
 112     }
 113   catch (const gdb_exception &ex)
 114     {
 115       exception_print (gdb_stderr, ex);
 116
 117       if (!tui_active)
 118         rl_prep_terminal (0);
 119     }
 120
 121   /* Clear the readline in case switching occurred in middle of
 122      something.  */
 123   if (rl_end)
 124     rl_kill_text (0, rl_end);
 125
 126   /* Since we left the curses mode, the terminal mode is restored to
 127      some previous state.  That state may not be suitable for readline
 128      to work correctly (it may be restored in line mode).  We force an
 129      exit of the current readline so that readline is re-entered and
 130      it will be able to setup the terminal for its needs.  By
 131      re-entering in readline, we also redisplay its prompt in the
 132      non-curses mode.  */
 133   rl_newline (1, '\n');
 134
 135   /* Make sure the \n we are returning does not repeat the last
 136      command.  */
 137   dont_repeat ();
 138   return 0;
 139 }
 140
 141 /* TUI readline command.
 142    Change the TUI layout to show a next layout.
 143    This function is bound to CTRL-X 2.  It is intended to provide
 144    a functionality close to the Emacs split-window command.  We
 145    always show two windows (src+asm), (src+regs) or (asm+regs).  */
 146 static int
 147 tui_rl_change_windows (int notused1, int notused2)
 148 {
 149   if (!tui_active)
 150     tui_rl_switch_mode (0 /* notused */, 0 /* notused */);
 151
 152   if (tui_active)
 153     {
 154       enum tui_layout_type new_layout;
 155
 156       new_layout = tui_current_layout ();
 157
 158       /* Select a new layout to have a rolling layout behavior with
 159          always two windows (except when undefined).  */
 160       switch (new_layout)
 161         {
 162         case SRC_COMMAND:
 163           new_layout = SRC_DISASSEM_COMMAND;
 164           break;
 165
 166         case DISASSEM_COMMAND:
 167           new_layout = SRC_DISASSEM_COMMAND;
 168           break;
 169
 170         case SRC_DATA_COMMAND:
 171           new_layout = SRC_DISASSEM_COMMAND;
 172           break;
 173
 174         case SRC_DISASSEM_COMMAND:
 175           new_layout = DISASSEM_DATA_COMMAND;
 176           break;
 177
 178         case DISASSEM_DATA_COMMAND:
 179           new_layout = SRC_DATA_COMMAND;
 180           break;
 181
 182         default:
 183           new_layout = SRC_COMMAND;
 184           break;
 185         }
 186       tui_set_layout (new_layout);
 187     }
 188   return 0;
 189 }
 190
 191 /* TUI readline command.
 192    Delete the second TUI window to only show one.  */
 193 static int
 194 tui_rl_delete_other_windows (int notused1, int notused2)
 195 {
 196   if (!tui_active)
 197     tui_rl_switch_mode (0 /* notused */, 0 /* notused */);
 198
 199   if (tui_active)
 200     {
 201       enum tui_layout_type new_layout;
 202
 203       new_layout = tui_current_layout ();
 204
 205       /* Kill one window.  */
 206       switch (new_layout)
 207         {
 208         case SRC_COMMAND:
 209         case SRC_DATA_COMMAND:
 210         case SRC_DISASSEM_COMMAND:
 211         default:
 212           new_layout = SRC_COMMAND;
 213           break;
 214
 215         case DISASSEM_COMMAND:
 216         case DISASSEM_DATA_COMMAND:
 217           new_layout = DISASSEM_COMMAND;
 218           break;
 219         }
 220       tui_set_layout (new_layout);
 221     }
 222   return 0;
 223 }
 224
 225 /* TUI readline command.
 226    Switch the active window to give the focus to a next window.  */
 227 static int
 228 tui_rl_other_window (int count, int key)
 229 {
 230   struct tui_win_info *win_info;
 231
 232   if (!tui_active)
 233     tui_rl_switch_mode (0 /* notused */, 0 /* notused */);
 234
 235   win_info = tui_next_win (tui_win_with_focus ());
 236   if (win_info)
 237     {
 238       tui_set_win_focus_to (win_info);
 239       if (TUI_DATA_WIN && TUI_DATA_WIN->generic.is_visible)
 240         tui_refresh_data_win ();
 241       keypad (TUI_CMD_WIN->generic.handle, (win_info != TUI_CMD_WIN));
 242     }
 243   return 0;
 244 }
 245
 246 /* TUI readline command.
 247    Execute the gdb command bound to the specified key.  */
 248 static int
 249 tui_rl_command_key (int count, int key)
 250 {
 251   int i;
 252
 253   reinitialize_more_filter ();
 254   for (i = 0; tui_commands[i].cmd; i++)
 255     {
 256       if (tui_commands[i].key == key)
 257         {
 258           /* Insert the command in the readline buffer.
 259              Avoid calling the gdb command here since it creates
 260              a possible recursion on readline if prompt_for_continue
 261              is called (See PR 9584).  The command will also appear
 262              in the readline history which turns out to be better.  */
 263           rl_insert_text (tui_commands[i].cmd);
 264           rl_newline (1, '\n');
 265
 266           /* Switch to gdb command mode while executing the command.
 267              This way the gdb's continue prompty will be displayed.  */
 268           tui_set_key_mode (TUI_ONE_COMMAND_MODE);
 269           return 0;
 270         }
 271     }
 272   return 0;
 273 }
 274
 275 /* TUI readline command.
 276    Temporarily leave the TUI SingleKey mode to allow editing
 277    a gdb command with the normal readline.  Once the command
 278    is executed, the TUI SingleKey mode is installed back.  */
 279 static int
 280 tui_rl_command_mode (int count, int key)
 281 {
 282   tui_set_key_mode (TUI_ONE_COMMAND_MODE);
 283   return rl_insert (count, key);
 284 }
 285
 286 /* TUI readline command.
 287    Switch between TUI SingleKey mode and gdb readline editing.  */
 288 static int
 289 tui_rl_next_keymap (int notused1, int notused2)
 290 {
 291   if (!tui_active)
 292     tui_rl_switch_mode (0 /* notused */, 0 /* notused */);
 293
 294   tui_set_key_mode (tui_current_key_mode == TUI_COMMAND_MODE
 295                     ? TUI_SINGLE_KEY_MODE : TUI_COMMAND_MODE);
 296   return 0;
 297 }
 298
 299 /* Readline hook to redisplay ourself the gdb prompt.
 300    In the SingleKey mode, the prompt is not printed so that
 301    the command window is cleaner.  It will be displayed if
 302    we temporarily leave the SingleKey mode.  */
 303 static int
 304 tui_rl_startup_hook (void)
 305 {
 306   rl_already_prompted = 1;
 307   if (tui_current_key_mode != TUI_COMMAND_MODE
 308       && !gdb_in_secondary_prompt_p (current_ui))
 309     tui_set_key_mode (TUI_SINGLE_KEY_MODE);
 310   tui_redisplay_readline ();
 311   return 0;
 312 }
 313
 314 /* Change the TUI key mode by installing the appropriate readline
 315    keymap.  */
 316 void
 317 tui_set_key_mode (enum tui_key_mode mode)
 318 {
 319   tui_current_key_mode = mode;
 320   rl_set_keymap (mode == TUI_SINGLE_KEY_MODE
 321                  ? tui_keymap : tui_readline_standard_keymap);
 322   tui_show_locator_content ();
 323 }
 324
 325 /* Initialize readline and configure the keymap for the switching
 326    key shortcut.  */
 327 void
 328 tui_initialize_readline (void)
 329 {
 330   int i;
 331   Keymap tui_ctlx_keymap;
 332
 333   rl_initialize ();
 334
 335   rl_add_defun ("tui-switch-mode", tui_rl_switch_mode, -1);
 336   rl_add_defun ("gdb-command", tui_rl_command_key, -1);
 337   rl_add_defun ("next-keymap", tui_rl_next_keymap, -1);
 338
 339   tui_keymap = rl_make_bare_keymap ();
 340   tui_ctlx_keymap = rl_make_bare_keymap ();
 341   tui_readline_standard_keymap = rl_get_keymap ();
 342
 343   for (i = 0; tui_commands[i].cmd; i++)
 344     rl_bind_key_in_map (tui_commands[i].key, tui_rl_command_key, tui_keymap);
 345
 346   rl_generic_bind (ISKMAP, "\\C-x", (char*) tui_ctlx_keymap, tui_keymap);
 347
 348   /* Bind all other keys to tui_rl_command_mode so that we switch
 349      temporarily from SingleKey mode and can enter a gdb command.  */
 350   for (i = ' '; i < 0x7f; i++)
 351     {
 352       int j;
 353
 354       for (j = 0; tui_commands[j].cmd; j++)
 355         if (tui_commands[j].key == i)
 356           break;
 357
 358       if (tui_commands[j].cmd)
 359         continue;
 360
 361       rl_bind_key_in_map (i, tui_rl_command_mode, tui_keymap);
 362     }
 363
 364   rl_bind_key_in_map ('a', tui_rl_switch_mode, emacs_ctlx_keymap);
 365   rl_bind_key_in_map ('a', tui_rl_switch_mode, tui_ctlx_keymap);
 366   rl_bind_key_in_map ('A', tui_rl_switch_mode, emacs_ctlx_keymap);
 367   rl_bind_key_in_map ('A', tui_rl_switch_mode, tui_ctlx_keymap);
 368   rl_bind_key_in_map (CTRL ('A'), tui_rl_switch_mode, emacs_ctlx_keymap);
 369   rl_bind_key_in_map (CTRL ('A'), tui_rl_switch_mode, tui_ctlx_keymap);
 370   rl_bind_key_in_map ('1', tui_rl_delete_other_windows, emacs_ctlx_keymap);
 371   rl_bind_key_in_map ('1', tui_rl_delete_other_windows, tui_ctlx_keymap);
 372   rl_bind_key_in_map ('2', tui_rl_change_windows, emacs_ctlx_keymap);
 373   rl_bind_key_in_map ('2', tui_rl_change_windows, tui_ctlx_keymap);
 374   rl_bind_key_in_map ('o', tui_rl_other_window, emacs_ctlx_keymap);
 375   rl_bind_key_in_map ('o', tui_rl_other_window, tui_ctlx_keymap);
 376   rl_bind_key_in_map ('q', tui_rl_next_keymap, tui_keymap);
 377   rl_bind_key_in_map ('s', tui_rl_next_keymap, emacs_ctlx_keymap);
 378   rl_bind_key_in_map ('s', tui_rl_next_keymap, tui_ctlx_keymap);
 379 }
 380
 381 /* Return the TERM variable from the environment, or "<unset>"
 382    if not set.  */
 383
 384 static const char *
 385 gdb_getenv_term (void)
 386 {
 387   const char *term;
 388
 389   term = getenv ("TERM");
 390   if (term != NULL)
 391     return term;
 392   return "<unset>";
 393 }
 394
 395 /* Enter in the tui mode (curses).
 396    When in normal mode, it installs the tui hooks in gdb, redirects
 397    the gdb output, configures the readline to work in tui mode.
 398    When in curses mode, it does nothing.  */
 399 void
 400 tui_enable (void)
 401 {
 402   if (tui_active)
 403     return;
 404
 405   /* To avoid to initialize curses when gdb starts, there is a defered
 406      curses initialization.  This initialization is made only once
 407      and the first time the curses mode is entered.  */
 408   if (tui_finish_init)
 409     {
 410       WINDOW *w;
 411       SCREEN *s;
 412 #ifndef __MINGW32__
 413        const char *cap;
 414 #endif
 415       const char *interp;
 416
 417       /* If the top level interpreter is not the console/tui (e.g.,
 418          MI), enabling curses will certainly lose.  */
 419       interp = top_level_interpreter ()->name ();
 420       if (strcmp (interp, INTERP_TUI) != 0)
 421         error (_("Cannot enable the TUI when the interpreter is '%s'"), interp);
 422
 423       /* Don't try to setup curses (and print funny control
 424          characters) if we're not outputting to a terminal.  */
 425       if (!ui_file_isatty (gdb_stdout))
 426         error (_("Cannot enable the TUI when output is not a terminal"));
 427
 428       s = newterm (NULL, stdout, stdin);
 429 #ifdef __MINGW32__
 430       /* The MinGW port of ncurses requires $TERM to be unset in order
 431          to activate the Windows console driver.  */
 432       if (s == NULL)
 433         s = newterm ((char *) "unknown", stdout, stdin);
 434 #endif
 435       if (s == NULL)
 436         {
 437           error (_("Cannot enable the TUI: error opening terminal [TERM=%s]"),
 438                  gdb_getenv_term ());
 439         }
 440       w = stdscr;
 441       if (has_colors ())
 442         {
 443 #ifdef HAVE_USE_DEFAULT_COLORS
 444           /* Ncurses extension to help with resetting to the default
 445              color.  */
 446           use_default_colors ();
 447 #endif
 448           start_color ();
 449         }
 450
 451       /* Check required terminal capabilities.  The MinGW port of
 452          ncurses does have them, but doesn't expose them through "cup".  */
 453 #ifndef __MINGW32__
 454       cap = tigetstr ((char *) "cup");
 455       if (cap == NULL || cap == (char *) -1 || *cap == '\0')
 456         {
 457           endwin ();
 458           delscreen (s);
 459           error (_("Cannot enable the TUI: "
 460                    "terminal doesn't support cursor addressing [TERM=%s]"),
 461                  gdb_getenv_term ());
 462         }
 463 #endif
 464
 465       cbreak ();
 466       noecho ();
 467       /* timeout (1); */
 468       nodelay(w, FALSE);
 469       nl();
 470       keypad (w, TRUE);
 471       rl_initialize ();
 472       tui_set_term_height_to (LINES);
 473       tui_set_term_width_to (COLS);
 474       def_prog_mode ();
 475
 476       tui_show_frame_info (0);
 477       tui_set_layout (SRC_COMMAND);
 478       tui_set_win_focus_to (TUI_SRC_WIN);
 479       keypad (TUI_CMD_WIN->generic.handle, TRUE);
 480       wrefresh (TUI_CMD_WIN->generic.handle);
 481       tui_finish_init = 0;
 482     }
 483   else
 484     {
 485      /* Save the current gdb setting of the terminal.
 486         Curses will restore this state when endwin() is called.  */
 487      def_shell_mode ();
 488      clearok (stdscr, TRUE);
 489    }
 490
 491   /* Install the TUI specific hooks.  */
 492   tui_install_hooks ();
 493   rl_startup_hook = tui_rl_startup_hook;
 494
 495   tui_update_variables ();
 496
 497   tui_setup_io (1);
 498
 499   tui_active = 1;
 500
 501   /* Resize windows before anything might display/refresh a
 502      window.  */
 503   if (tui_win_resized ())
 504     {
 505       tui_set_win_resized_to (FALSE);
 506       tui_resize_all ();
 507     }
 508
 509   if (deprecated_safe_get_selected_frame ())
 510     tui_show_frame_info (deprecated_safe_get_selected_frame ());
 511
 512   /* Restore TUI keymap.  */
 513   tui_set_key_mode (tui_current_key_mode);
 514
 515   /* Refresh the screen.  */
 516   tui_refresh_all_win ();
 517
 518   /* Update gdb's knowledge of its terminal.  */
 519   gdb_save_tty_state ();
 520   tui_update_gdb_sizes ();
 521 }
 522
 523 /* Leave the tui mode.
 524    Remove the tui hooks and configure the gdb output and readline
 525    back to their original state.  The curses mode is left so that
 526    the terminal setting is restored to the point when we entered.  */
 527 void
 528 tui_disable (void)
 529 {
 530   if (!tui_active)
 531     return;
 532
 533   /* Restore initial readline keymap.  */
 534   rl_set_keymap (tui_readline_standard_keymap);
 535
 536   /* Remove TUI hooks.  */
 537   tui_remove_hooks ();
 538   rl_startup_hook = 0;
 539   rl_already_prompted = 0;
 540
 541   /* Leave curses and restore previous gdb terminal setting.  */
 542   endwin ();
 543
 544   /* gdb terminal has changed, update gdb internal copy of it
 545      so that terminal management with the inferior works.  */
 546   tui_setup_io (0);
 547
 548   /* Update gdb's knowledge of its terminal.  */
 549   gdb_save_tty_state ();
 550
 551   tui_active = 0;
 552   tui_update_gdb_sizes ();
 553 }
 554
 555 /* Command wrapper for enabling tui mode.  */
 556
 557 static void
 558 tui_enable_command (const char *args, int from_tty)
 559 {
 560   tui_enable ();
 561 }
 562
 563 /* Command wrapper for leaving tui mode.  */
 564
 565 static void
 566 tui_disable_command (const char *args, int from_tty)
 567 {
 568   tui_disable ();
 569 }
 570
 571 void
 572 strcat_to_buf (char *buf, int buflen,
 573                const char *item_to_add)
 574 {
 575   if (item_to_add != NULL && buf != NULL)
 576     {
 577       if ((strlen (buf) + strlen (item_to_add)) <= buflen)
 578         strcat (buf, item_to_add);
 579       else
 580         strncat (buf, item_to_add, (buflen - strlen (buf)));
 581     }
 582 }
 583
 584 #if 0
 585 /* Solaris <sys/termios.h> defines CTRL.  */
 586 #ifndef CTRL
 587 #define CTRL(x)         (x & ~0140)
 588 #endif
 589
 590 #define FILEDES         2
 591 #define CHK(val, dft)   (val<=0 ? dft : val)
 592
 593 static void
 594 tui_reset (void)
 595 {
 596   struct termio mode;
 597
 598   /* Reset the teletype mode bits to a sensible state.
 599      Copied tset.c.  */
 600 #if defined (TIOCGETC)
 601   struct tchars tbuf;
 602 #endif /* TIOCGETC */
 603 #ifdef UCB_NTTY
 604   struct ltchars ltc;
 605
 606   if (ldisc == NTTYDISC)
 607     {
 608       ioctl (FILEDES, TIOCGLTC, &ltc);
 609       ltc.t_suspc = CHK (ltc.t_suspc, CTRL ('Z'));
 610       ltc.t_dsuspc = CHK (ltc.t_dsuspc, CTRL ('Y'));
 611       ltc.t_rprntc = CHK (ltc.t_rprntc, CTRL ('R'));
 612       ltc.t_flushc = CHK (ltc.t_flushc, CTRL ('O'));
 613       ltc.t_werasc = CHK (ltc.t_werasc, CTRL ('W'));
 614       ltc.t_lnextc = CHK (ltc.t_lnextc, CTRL ('V'));
 615       ioctl (FILEDES, TIOCSLTC, &ltc);
 616     }
 617 #endif /* UCB_NTTY */
 618 #ifdef TIOCGETC
 619   ioctl (FILEDES, TIOCGETC, &tbuf);
 620   tbuf.t_intrc = CHK (tbuf.t_intrc, CTRL ('?'));
 621   tbuf.t_quitc = CHK (tbuf.t_quitc, CTRL ('\\'));
 622   tbuf.t_startc = CHK (tbuf.t_startc, CTRL ('Q'));
 623   tbuf.t_stopc = CHK (tbuf.t_stopc, CTRL ('S'));
 624   tbuf.t_eofc = CHK (tbuf.t_eofc, CTRL ('D'));
 625   /* brkc is left alone.  */
 626   ioctl (FILEDES, TIOCSETC, &tbuf);
 627 #endif /* TIOCGETC */
 628   mode.sg_flags &= ~(RAW
 629 #ifdef CBREAK
 630                      | CBREAK
 631 #endif /* CBREAK */
 632                      | VTDELAY | ALLDELAY);
 633   mode.sg_flags |= XTABS | ECHO | CRMOD | ANYP;
 634
 635   return;
 636 }
 637 #endif
 638
 639 void
 640 tui_show_source (const char *fullname, int line)
 641 {
 642   struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 643
 644   /* Make sure that the source window is displayed.  */
 645   tui_add_win_to_layout (SRC_WIN);
 646
 647   tui_update_source_windows_with_line (cursal.symtab, line);
 648   tui_update_locator_fullname (fullname);
 649 }
 650
 651 void
 652 tui_show_assembly (struct gdbarch *gdbarch, CORE_ADDR addr)
 653 {
 654   tui_add_win_to_layout (DISASSEM_WIN);
 655   tui_update_source_windows_with_addr (gdbarch, addr);
 656 }
 657
 658 int
 659 tui_is_window_visible (enum tui_win_type type)
 660 {
 661   if (tui_active == 0)
 662     return 0;
 663
 664   if (tui_win_list[type] == 0)
 665     return 0;
 666
 667   return tui_win_list[type]->generic.is_visible;
 668 }
 669
 670 int
 671 tui_get_command_dimension (unsigned int *width,
 672                            unsigned int *height)
 673 {
 674   if (!tui_active || (TUI_CMD_WIN == NULL))
 675     {
 676       return 0;
 677     }
 678
 679   *width = TUI_CMD_WIN->generic.width;
 680   *height = TUI_CMD_WIN->generic.height;
 681   return 1;
 682 }
 683
 684 void
 685 _initialize_tui (void)
 686 {
 687   struct cmd_list_element **tuicmd;
 688
 689   tuicmd = tui_get_cmd_list ();
 690
 691   add_cmd ("enable", class_tui, tui_enable_command,
 692            _("Enable TUI display mode."),
 693            tuicmd);
 694   add_cmd ("disable", class_tui, tui_disable_command,
 695            _("Disable TUI display mode."),
 696            tuicmd);
 697 }