observable_confvar.cpp

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/*************************************************************************
 *
 * Copyright (C) 2022 Alec Leamas
 *
 * 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, see <https://www.gnu.org/licenses/>.
 **************************************************************************/
 
#include <sstream>
#include <string>
 
#include <wx/log.h>
#include <wx/string.h>
#include <wx/config.h>
 
#include "observable/configvar.h"
 
static std::istream& operator>>(std::istream& input, wxString& ws) {
  std::string s;
  input >> s;
  ws.Append(s);
  return input;
}
 
/* ConfigVar implementation. */
 
template <typename T>
obs::ConfigVar<T>::ConfigVar(const std::string& section_,
                             const std::string& key_, wxConfigBase* cb)
    : Observable(section_ + "/" + key_),
      m_section(section_),
      m_key(key_),
      m_config(cb) {}
 
template <typename T>
T obs::ConfigVar<T>::Get(const T& default_val) {
  std::istringstream iss;
  m_config->SetPath(m_section);
  auto value = m_config->Read(m_key, "").ToStdString();
  iss.str(value);
  T r;
  iss >> r;
  return iss.fail() ? default_val : r;
}
 
template <typename T>
void obs::ConfigVar<T>::Set(const T& arg) {
  std::ostringstream oss;
  oss << arg;
  if (oss.fail()) {
    wxLogWarning("Cannot dump failed buffer for key %s:%s", m_section.c_str(),
                 m_key.c_str());
    return;
  }
  m_config->SetPath(m_section);
  if (!m_config->Write(m_key.c_str(), oss.str().c_str())) {
    wxLogWarning("Error writing buffer to key %s:%s", m_section.c_str(),
                 m_key.c_str());
  }
  Observable::Notify();
}
 
/* Explicitly instantiate the ConfigVar types supported. */
template class obs::ConfigVar<bool>;
template class obs::ConfigVar<double>;
template class obs::ConfigVar<int>;
template class obs::ConfigVar<std::string>;
template class obs::ConfigVar<wxString>;