/* Command-line output logging for GDB, the GNU debugger.

   Copyright 2003, 2004 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 2 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, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "gdbcmd.h"
#include "ui-out.h"

#include "gdb_string.h"

/* These hold the pushed copies of the gdb output files.
   If NULL then nothing has yet been pushed.  */
struct saved_output_files
{
  struct ui_file *out;
  struct ui_file *err;
  struct ui_file *log;
  struct ui_file *targ;
};
static struct saved_output_files saved_output;
static char *saved_filename;

static char *logging_filename;
int logging_overwrite, logging_redirect;

/* If we've pushed output files, close them and pop them.  */
static void
pop_output_files (void)
{
  /* Only delete one of the files -- they are all set to the same
     value.  */
  ui_file_delete (gdb_stdout);
  gdb_stdout = saved_output.out;
  gdb_stderr = saved_output.err;
  gdb_stdlog = saved_output.log;
  gdb_stdtarg = saved_output.targ;
  saved_output.out = NULL;
  saved_output.err = NULL;
  saved_output.log = NULL;
  saved_output.targ = NULL;

  ui_out_redirect (uiout, NULL);
}

/* This is a helper for the `set logging' command.  */
static void
handle_redirections (int from_tty)
{
  struct ui_file *output;

  if (saved_filename != NULL)
    {
      fprintf_unfiltered (gdb_stdout, "Already logging to %s.\n",
			  saved_filename);
      return;
    }

  output = gdb_fopen (logging_filename, logging_overwrite ? "w" : "a");
  if (output == NULL)
    perror_with_name ("set logging");

  /* Redirects everything to gdb_stdout while this is running.  */
  if (!logging_redirect)
    {
      output = tee_file_new (gdb_stdout, 0, output, 1);
      if (output == NULL)
	perror_with_name ("set logging");
      if (from_tty)
	fprintf_unfiltered (gdb_stdout, "Copying output to %s.\n",
			    logging_filename);
    }
  else if (from_tty)
    fprintf_unfiltered (gdb_stdout, "Redirecting output to %s.\n",
			logging_filename);

  saved_filename = xstrdup (logging_filename);
  saved_output.out = gdb_stdout;
  saved_output.err = gdb_stderr;
  saved_output.log = gdb_stdlog;
  saved_output.targ = gdb_stdtarg;

  gdb_stdout = output;
  gdb_stderr = output;
  gdb_stdlog = output;
  gdb_stdtarg = output;

  if (ui_out_redirect (uiout, gdb_stdout) < 0)
    warning ("Current output protocol does not support redirection");
}

static void
set_logging_on (char *args, int from_tty)
{
  char *rest = args;
  if (rest && *rest)
    {
      xfree (logging_filename);
      logging_filename = xstrdup (rest);
    }
  handle_redirections (from_tty);
}

static void 
set_logging_off (char *args, int from_tty)
{
  if (saved_filename == NULL)
    return;

  pop_output_files ();
  if (from_tty)
    fprintf_unfiltered (gdb_stdout, "Done logging to %s.\n", saved_filename);
  xfree (saved_filename);
  saved_filename = NULL;
}

static void
set_logging_command (char *args, int from_tty)
{
  printf_unfiltered ("\"set logging\" lets you log output to a file.\n");
  printf_unfiltered ("Usage: set logging on [FILENAME]\n");
  printf_unfiltered ("       set logging off\n");
  printf_unfiltered ("       set logging file FILENAME\n");
  printf_unfiltered ("       set logging overwrite [on|off]\n");
  printf_unfiltered ("       set logging redirect [on|off]\n");
}

void
show_logging_command (char *args, int from_tty)
{
  if (saved_filename)
    printf_unfiltered ("Currently logging to \"%s\".\n", saved_filename);
  if (saved_filename == NULL
      || strcmp (logging_filename, saved_filename) != 0)
    printf_unfiltered ("Future logs will be written to %s.\n",
		       logging_filename);

  if (logging_overwrite)
    printf_unfiltered ("Logs will overwrite the log file.\n");
  else
    printf_unfiltered ("Logs will be appended to the log file.\n");

  if (logging_redirect)
    printf_unfiltered ("Output will be sent only to the log file.\n");
  else
    printf_unfiltered ("Output will be logged and displayed.\n");
}

void
_initialize_cli_logging (void)
{
  static struct cmd_list_element *set_logging_cmdlist, *show_logging_cmdlist;

  
  add_prefix_cmd ("logging", class_support, set_logging_command,
		  "Set logging options", &set_logging_cmdlist,
		  "set logging ", 0, &setlist);
  add_prefix_cmd ("logging", class_support, show_logging_command,
		  "Show logging options", &show_logging_cmdlist,
		  "show logging ", 0, &showlist);
  add_setshow_boolean_cmd ("overwrite", class_support, &logging_overwrite, "\
Set whether logging overwrites or appends to the log file.", "\
Show whether logging overwrites or appends to the log file.", "\
If set, logging overrides the log file.", "\
Whether logging overwrites or appends to the log file is %s.",
			   NULL, NULL, &set_logging_cmdlist, &show_logging_cmdlist);
  add_setshow_boolean_cmd ("redirect", class_support, &logging_redirect, "\
Set the logging output mode.", "\
Show the logging output mode.", "\
If redirect is off, output will go to both the screen and the log file.\n\
If redirect is on, output will go only to the log file.", "\
The logging output mode is %s.",
			   NULL, NULL, &set_logging_cmdlist, &show_logging_cmdlist);
  add_setshow_filename_cmd ("file", class_support, &logging_filename, "\
Set the current logfile.", "\
Show the current logfile.", "\
The logfile is used when directing GDB's output.", "\
The current logfile is %s.",
			    NULL, NULL,
			    &set_logging_cmdlist, &show_logging_cmdlist);
  add_cmd ("on", class_support, set_logging_on,
	   "Enable logging.", &set_logging_cmdlist);
  add_cmd ("off", class_support, set_logging_off,
	   "Disable logging.", &set_logging_cmdlist);

  logging_filename = xstrdup ("gdb.txt");
}