utils_dir.cpp

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/**
 *
 *   Copyright (c) 2005-2021 by Pierre-Henri WUILLEMIN(@LIP6) & Christophe GONZALES(@AMU)
 *   info_at_agrum_dot_org
 *
 *  This library is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This library 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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


/**
 * @file
 * @brief Contains usefull methods to work with directories.
 *
 * @author Vincent RENAUDINEAU and Pierre-Henri WUILLEMIN(@LIP6)
 */

#include <agrum/tools/core/utils_dir.h>

namespace gum {

  // Return true if \a directory is a valid directory, false otherwise.
  bool Directory::isDir(const std::string& directory) { return Directory(directory).isValid(); }

  // Contructor
  Directory::Directory() : m_dirPtr(nullptr) {
    GUM_CONSTRUCTOR(Directory);
    ;
  }

  // Contructor
  Directory::Directory(const std::string& directory) : m_dirName(directory) {
    GUM_CONSTRUCTOR(Directory);
    m_dirPtr = opendir(m_dirName.c_str());
  }

  // Contructor
  Directory::Directory(const Directory& dir) : m_dirName(dir.m_dirName) {
    GUM_CONSTRUCTOR(Directory);
    m_dirPtr = opendir(m_dirName.c_str());
  }

  // Destructor
  Directory::~Directory() {
    GUM_DESTRUCTOR(Directory);

    if (m_dirPtr != nullptr) closedir(m_dirPtr);
  }

  // Return true if directory has been opened, false otherwise.
  bool Directory::isValid() const { return m_dirPtr != nullptr; }

  // Return directory content.
  std::vector< std::string > Directory::entries() const {
    std::vector< std::string > result;

    if (!isValid()) return result;

    rewinddir(m_dirPtr);

    dirent* entry;

    while ((entry = readdir(m_dirPtr)))
      result.push_back(std::string(entry->d_name));

    return result;
  }

  // Return directory parent.
  Directory Directory::parent() const {
    if (!isValid()) return Directory();

    return Directory(m_dirName + "../");
  }

  // Return directory path.
  std::string Directory::path() const { return m_dirName; }

  // Return directory absolute path.
  std::string Directory::absolutePath() const {
    std::string result;

    if (!isValid()) return result;

    char oldWD[255];

    if (getcwd(oldWD, 255) == nullptr) return result;

    if (chdir(m_dirName.c_str()) != 0) return result;

    char absPath[255];

    if (getcwd(absPath, 254) != nullptr) result = std::string(absPath) + '/';

    if (chdir(oldWD) != 0)
      std::cerr << "Warning : Could not go to previous working directory. (" << __FILE__ << ":"
                << __LINE__ << ")" << std::endl;

    return result;
  }

  Directory& Directory::operator=(const Directory& d) {
    if (m_dirPtr != nullptr) closedir(m_dirPtr);

    m_dirName = d.m_dirName;

    m_dirPtr = opendir(m_dirName.c_str());

    return *this;
  }

}   // namespace gum