configfacade.cpp

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/*
  ConfigFacade  -  C++ convenience wrapper and startup of the config system
 
   Copyright (C)
     2008,            Hermann Vosseler <Ichthyostega@web.de>
 
 **Lumiera** 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. See the file COPYING for further details.
 
* *****************************************************************/
 
 
#include "include/logging.h"
#include "include/lifecycle.h"
#include "include/config-facade.h"
#include "common/appstate.hpp"
#include "lib/searchpath.hpp"
#include "lib/iter-explorer.hpp"
#include "lib/format-util.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 ()
  {            // Meyer's Singleton...
    static string pathSpec = []{ string pluginPath = Config::get (KEY_PLUGIN_PATH);
                                 return "plugin.path=" // syntax expected by lumiera_config_setdefault
                                      + util::join (SearchPathSplitter{pluginPath}, ":");
                               }();
    return cStr(pathSpec);
  }
}