/* MI Command Set - environment commands.

   Copyright (C) 2002, 2003, 2004, 2007, 2008, 2009, 2010, 2011
   Free Software Foundation, Inc.

   Contributed by Red Hat 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 "inferior.h"
#include "value.h"
#include "mi-out.h"
#include "mi-cmds.h"
#include "mi-getopt.h"
#include "symtab.h"
#include "target.h"
#include "environ.h"
#include "command.h"
#include "ui-out.h"
#include "top.h"

#include "gdb_string.h"
#include "gdb_stat.h"

static void env_mod_path (char *dirname, char **which_path);
extern void _initialize_mi_cmd_env (void);

static const char path_var_name[] = "PATH";
static char *orig_path = NULL;

/* The following is copied from mi-main.c so for m1 and below we can
   perform old behavior and use cli commands.  If ARGS is non-null,
   append it to the CMD.  */
static void
env_execute_cli_command (const char *cmd, const char *args)
{
  if (cmd != 0)
    {
      struct cleanup *old_cleanups;
      char *run;

      if (args != NULL)
	run = xstrprintf ("%s %s", cmd, args);
      else
	run = xstrdup (cmd);
      old_cleanups = make_cleanup (xfree, run);
      execute_command ( /*ui */ run, 0 /*from_tty */ );
      do_cleanups (old_cleanups);
      return;
    }
}


/* Print working directory.  */
void
mi_cmd_env_pwd (char *command, char **argv, int argc)
{
  if (argc > 0)
    error (_("-environment-pwd: No arguments required"));
          
  if (mi_version (uiout) < 2)
    {
      env_execute_cli_command ("pwd", NULL);
      return;
    }
     
  /* Otherwise the mi level is 2 or higher.  */

  if (! getcwd (gdb_dirbuf, sizeof (gdb_dirbuf)))
    error (_("-environment-pwd: error finding name of working directory: %s"),
           safe_strerror (errno));
    
  ui_out_field_string (uiout, "cwd", gdb_dirbuf);
}

/* Change working directory.  */
void
mi_cmd_env_cd (char *command, char **argv, int argc)
{
  if (argc == 0 || argc > 1)
    error (_("-environment-cd: Usage DIRECTORY"));
          
  env_execute_cli_command ("cd", argv[0]);
}

static void
env_mod_path (char *dirname, char **which_path)
{
  if (dirname == 0 || dirname[0] == '\0')
    return;

  /* Call add_path with last arg 0 to indicate not to parse for 
     separator characters.  */
  add_path (dirname, which_path, 0);
}

/* Add one or more directories to start of executable search path.  */
void
mi_cmd_env_path (char *command, char **argv, int argc)
{
  char *exec_path;
  char *env;
  int reset = 0;
  int optind = 0;
  int i;
  char *optarg;
  enum opt
    {
      RESET_OPT
    };
  static struct mi_opt opts[] =
  {
    {"r", RESET_OPT, 0},
    { 0, 0, 0 }
  };

  dont_repeat ();

  if (mi_version (uiout) < 2)
    {
      for (i = argc - 1; i >= 0; --i)
	env_execute_cli_command ("path", argv[i]);
      return;
    }

  /* Otherwise the mi level is 2 or higher.  */
  while (1)
    {
      int opt = mi_getopt ("-environment-path", argc, argv, opts,
                           &optind, &optarg);

      if (opt < 0)
        break;
      switch ((enum opt) opt)
        {
        case RESET_OPT:
          reset = 1;
          break;
        }
    }
  argv += optind;
  argc -= optind;


  if (reset)
    {
      /* Reset implies resetting to original path first.  */
      exec_path = xstrdup (orig_path);
    }
  else
    {
      /* Otherwise, get current path to modify.  */
      env = get_in_environ (current_inferior ()->environment, path_var_name);

      /* Can be null if path is not set.  */
      if (!env)
        env = "";
      exec_path = xstrdup (env);
    }

  for (i = argc - 1; i >= 0; --i)
    env_mod_path (argv[i], &exec_path);

  set_in_environ (current_inferior ()->environment, path_var_name, exec_path);
  xfree (exec_path);
  env = get_in_environ (current_inferior ()->environment, path_var_name);
  ui_out_field_string (uiout, "path", env);
}

/* Add zero or more directories to the front of the source path.  */
void
mi_cmd_env_dir (char *command, char **argv, int argc)
{
  int i;
  int optind = 0;
  int reset = 0;
  char *optarg;
  enum opt
    {
      RESET_OPT
    };
  static struct mi_opt opts[] =
  {
    {"r", RESET_OPT, 0},
    { 0, 0, 0 }
  };

  dont_repeat ();

  if (mi_version (uiout) < 2)
    {
      for (i = argc - 1; i >= 0; --i)
	env_execute_cli_command ("dir", argv[i]);
      return;
    }

  /* Otherwise mi level is 2 or higher.  */
  while (1)
    {
      int opt = mi_getopt ("-environment-directory", argc, argv, opts,
                           &optind, &optarg);

      if (opt < 0)
        break;
      switch ((enum opt) opt)
        {
        case RESET_OPT:
          reset = 1;
          break;
        }
    }
  argv += optind;
  argc -= optind;

  if (reset)
    {
      /* Reset means setting to default path first.  */
      xfree (source_path);
      init_source_path ();
    }

  for (i = argc - 1; i >= 0; --i)
    env_mod_path (argv[i], &source_path);

  ui_out_field_string (uiout, "source-path", source_path);
  forget_cached_source_info ();
}

/* Set the inferior terminal device name.  */
void
mi_cmd_inferior_tty_set (char *command, char **argv, int argc)
{
  set_inferior_io_terminal (argv[0]);
}

/* Print the inferior terminal device name  */
void
mi_cmd_inferior_tty_show (char *command, char **argv, int argc)
{
  const char *inferior_io_terminal = get_inferior_io_terminal ();
  
  if ( !mi_valid_noargs ("-inferior-tty-show", argc, argv))
    error (_("-inferior-tty-show: Usage: No args"));

  if (inferior_io_terminal)
    ui_out_field_string (uiout, "inferior_tty_terminal", inferior_io_terminal);
}

void 
_initialize_mi_cmd_env (void)
{
  struct gdb_environ *environment;
  char *env;

  /* We want original execution path to reset to, if desired later.
     At this point, current inferior is not created, so cannot use
     current_inferior ()->environment.  Also, there's no obvious
     place where this code can be moved suchs that it surely run
     before any code possibly mangles original PATH.  */
  environment = make_environ ();
  init_environ (environment);
  env = get_in_environ (environment, path_var_name);

  /* Can be null if path is not set.  */
  if (!env)
    env = "";
  orig_path = xstrdup (env);
  free_environ (environment);
}