configfacade.cpp

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/*
  ConfigFacade  -  C++ convenience wrapper and startup of the config system

  Copyright (C)         Lumiera.org
    2008,               Hermann Vosseler <Ichthyostega@web.de>

  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., 675 Mass Ave, Cambridge, MA 02139, USA.

* *****************************************************/


#include "include/logging.h"
#include "include/lifecycle.h"
#include "include/config-facade.h"
#include "common/appstate.hpp"
#include "lib/searchpath.hpp"
#include "lib/util.hpp"

extern "C" {
  #include "common/config.h"
}


#define KEY_CONFIG_PATH "Lumiera.configpath"

#define KEY_PLUGIN_PATH "Lumiera.modulepath"




namespace lumiera {
  
  using util::isnil;
  using lib::Literal;
  

  lib::Depend<Config> Config::instance;
  
  
  namespace {
    
    void
    pull_up_ConfigSystem ()
    {
      TRACE (common, "booting up config system");
      Config::instance();
    }
    
    LifecycleHook trigger__ (ON_BASIC_INIT, &pull_up_ConfigSystem);
  }
  
  
  
  
  Config::Config ()
  {
    string extendedConfigSearchPath = AppState::instance().fetchSetupValue (KEY_CONFIG_PATH);
    lumiera_config_init (cStr(extendedConfigSearchPath));
    TRACE (config, "Config system ready.");
  }
  
  
  Config::~Config()
  {
    lumiera_config_destroy();
    TRACE (config, "config system closed.");
  }
  
  
  
  string
  Config::get (lib::Literal key)
  {
    string value = AppState::instance().fetchSetupValue (key);
    if (isnil (value))
      throw error::Config ("Configuration value for key=\""+key+"\" is missing");
    
    return value;
  }



} // namespace lumiera


extern "C" { /* ==== implementation C interface for accessing setup.ini ======= */
  
  
  using std::string;
  using lumiera::Config;
  using lib::SearchPathSplitter;
  using util::isnil;
  
  
  
  const char*
  lumiera_get_plugin_path_default ()
  {
    static string pathSpec;
    if (isnil (pathSpec))
      {
        pathSpec += "plugin.path="; // syntax expected by lumiera_config_setdefault
        
        // fetch plugin search path from setup.ini and expand any $ORIGIN token
        SearchPathSplitter pathElement(Config::get (KEY_PLUGIN_PATH));
        while (pathElement)
          pathSpec += pathElement.next() +":";
      }
    
    return cStr(pathSpec);
  }
}