sintonia/library/ecasound-2.7.2/libecasound/eca-resources.cpp

// ------------------------------------------------------------------------
// eca_resources.cpp: User settings (ecasoundrc)
// Copyright (C) 1999-2002,2004,2005,2007 Kai Vehmanen
//
// Attributes:
//     eca-style-version: 3
//
// 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
// ------------------------------------------------------------------------

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string>
#include <cstdlib> /* getenv */

#include "kvu_dbc.h"

#include "eca-logger.h"
#include "eca-resources.h"
#include "eca-version.h"
#include "resource-file.h"

using std::string;

std::string ECA_RESOURCES::rc_override_file;

ECA_RESOURCES::ECA_RESOURCES(void) 
  : resources_found_rep(true)
{

  if (ECA_RESOURCES::rc_override_file.size() == 0) {
    /* case: load global and user resource files normally */
    string ecasound_resource_path (ECA_PKGDATADIR);

    globalrc_repp = new RESOURCE_FILE(ecasound_resource_path + "/ecasoundrc");
    if (globalrc_repp->keywords().size() == 0) {
      ECA_LOG_MSG(ECA_LOGGER::user_objects, "WARNING: Global resource file \"" + ecasound_resource_path + "/ecasoundrc" + "\" not available! Ecasound may not function properly!");
      resources_found_rep = false;
    }
    
    char* home_dir = getenv("HOME");
    if (home_dir != NULL) {
      string user_ecasoundrc_path = string(home_dir) + "/.ecasound";

      user_resource_directory_rep = user_ecasoundrc_path;

      userrc_repp = new RESOURCE_FILE(user_ecasoundrc_path + "/ecasoundrc");
      if (userrc_repp && userrc_repp->has("user-resource-directory") == true) {
	ECA_LOG_MSG(ECA_LOGGER::info, "WARNING: Old resource data found in \"" + user_ecasoundrc_path + "\". You can reset configuration parameters by removing the old rc-file.");
      }
    }
    else
      userrc_repp = 0;

    overriderc_repp = 0;
  }
  else {
    /* case: override, do not use global/user resource files */

    globalrc_repp = userrc_repp = 0;

    overriderc_repp = new RESOURCE_FILE(ECA_RESOURCES::rc_override_file);
    if (overriderc_repp->keywords().size() == 0) {
      ECA_LOG_MSG(ECA_LOGGER::user_objects, "WARNING: Override resource file \"" + ECA_RESOURCES::rc_override_file + "\" not available! Ecasound may not function properly!");
      resources_found_rep = false;
    }
  }
}

ECA_RESOURCES::~ECA_RESOURCES(void)
{
  if (userrc_repp && userrc_repp->is_modified() == true) {
    userrc_repp->resource("ecasound-version", ecasound_library_version);
    userrc_repp->save();
  }

  if (globalrc_repp != 0)
    delete globalrc_repp;

  if (userrc_repp != 0)
    delete userrc_repp;

  if (overriderc_repp != 0)
    delete overriderc_repp;
}

/**
 * Set resource 'tag' value to 'value'. If value wasn't 
 * previously defined, it's added.
 */
void ECA_RESOURCES::resource(const string& tag, const string& value)
{
  if (userrc_repp)
    userrc_repp->resource(tag, value);
}

/**
 * Returns value of resource 'tag'. Priority is given
 * to user-specified resources over global resources.
 */
string ECA_RESOURCES::resource(const string& tag) const
{
  if (tag == "user-resource-directory") 
    return user_resource_directory_rep;
  
  if (userrc_repp && userrc_repp->has(tag))
    return userrc_repp->resource(tag);
  
  if (globalrc_repp && globalrc_repp->has(tag))
    return globalrc_repp->resource(tag);

  if (overriderc_repp && overriderc_repp->has(tag))
    return overriderc_repp->resource(tag);

  return string();
}

/**
 * Returns true if resource 'tag' is 'true', otherwise false
 */
bool ECA_RESOURCES::boolean_resource(const string& tag) const
{
  if (userrc_repp && userrc_repp->has(tag))
    return userrc_repp->boolean_resource(tag);

  if (globalrc_repp && globalrc_repp->has(tag))
    return globalrc_repp->boolean_resource(tag);

  if (overriderc_repp && overriderc_repp->has(tag))
    return overriderc_repp->boolean_resource(tag);

  return false;
}
  
/**
 * Whether resource 'tag' is specified in the resource file
 */
bool ECA_RESOURCES::has(const string& tag) const
{
  if ((globalrc_repp && globalrc_repp->has(tag)) || 
      (userrc_repp && userrc_repp->has(tag)) ||
      (overriderc_repp && overriderc_repp->has(tag))) return true;

  return false;
}

/**
 * Are any resource values available?
 */
bool ECA_RESOURCES::has_any(void) const
{
  return resources_found_rep;
}