/* TUI Interpreter definitions for GDB, the GNU debugger.

   Copyright (C) 2003, 2007, 2008, 2009, 2010, 2011
   Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "interps.h"
#include "top.h"
#include "event-top.h"
#include "event-loop.h"
#include "ui-out.h"
#include "cli-out.h"
#include "tui/tui-data.h"
#include "readline/readline.h"
#include "tui/tui-win.h"
#include "tui/tui.h"
#include "tui/tui-io.h"
#include "exceptions.h"

/* Set to 1 when the TUI mode must be activated when we first start
   gdb.  */
static int tui_start_enabled = 0;

/* Cleanup the tui before exiting.  */

static void
tui_exit (void)
{
  /* Disable the tui.  Curses mode is left leaving the screen in a
     clean state (see endwin()).  */
  tui_disable ();
}

/* True if TUI is the top-level interpreter.  */
static int tui_is_toplevel = 0;

/* These implement the TUI interpreter.  */

static void *
tui_init (struct interp *self, int top_level)
{
  tui_is_toplevel = top_level;

  /* Install exit handler to leave the screen in a good shape.  */
  atexit (tui_exit);

  tui_initialize_static_data ();

  tui_initialize_io ();
  tui_initialize_win ();
  if (ui_file_isatty (gdb_stdout))
    tui_initialize_readline ();

  return NULL;
}

/* True if enabling the TUI is allowed.  Example, if the top level
   interpreter is MI, enabling curses will certainly lose.  */

int
tui_allowed_p (void)
{
  /* Only if TUI is the top level interpreter.  Also don't try to
     setup curses (and print funny control characters) if we're not
     outputting to a terminal.  */
  return tui_is_toplevel && ui_file_isatty (gdb_stdout);
}

static int
tui_resume (void *data)
{
  struct ui_file *stream;

  /* gdb_setup_readline will change gdb_stdout.  If the TUI was
     previously writing to gdb_stdout, then set it to the new
     gdb_stdout afterwards.  */

  stream = cli_out_set_stream (tui_old_uiout, gdb_stdout);
  if (stream != gdb_stdout)
    {
      cli_out_set_stream (tui_old_uiout, stream);
      stream = NULL;
    }

  gdb_setup_readline ();

  if (stream != NULL)
    cli_out_set_stream (tui_old_uiout, gdb_stdout);

  if (tui_start_enabled)
    tui_enable ();
  return 1;
}

static int
tui_suspend (void *data)
{
  tui_start_enabled = tui_active;
  tui_disable ();
  return 1;
}

/* Display the prompt if we are silent.  */

static int
tui_display_prompt_p (void *data)
{
  if (interp_quiet_p (NULL))
    return 0;
  else
    return 1;
}

static struct ui_out *
tui_ui_out (struct interp *self)
{
  if (tui_active)
    return tui_out;
  else
    return tui_old_uiout;
}

static struct gdb_exception
tui_exec (void *data, const char *command_str)
{
  internal_error (__FILE__, __LINE__, _("tui_exec called"));
}

/* Provide a prototype to silence -Wmissing-prototypes.  */
extern initialize_file_ftype _initialize_tui_interp;

void
_initialize_tui_interp (void)
{
  static const struct interp_procs procs = {
    tui_init,
    tui_resume,
    tui_suspend,
    tui_exec,
    tui_display_prompt_p,
    tui_ui_out,
  };
  struct interp *tui_interp;

  /* Create a default uiout builder for the TUI.  */
  tui_interp = interp_new (INTERP_TUI, &procs);
  interp_add (tui_interp);
  if (interpreter_p && strcmp (interpreter_p, INTERP_TUI) == 0)
    tui_start_enabled = 1;

  if (interpreter_p && strcmp (interpreter_p, INTERP_CONSOLE) == 0)
    {
      xfree (interpreter_p);
      interpreter_p = xstrdup (INTERP_TUI);
    }
}