source: trunk/lib/utility.h @ 226

#ifndef _theplu_svndigest_utility_
#define _theplu_svndigest_utility_

// $Id: utility.h 226 2007-03-11 19:32:41Z peter $

/*
  Copyright (C) 2005, 2006 Jari Häkkinen, Peter Johansson

  This file is part of svndigest, http://lev.thep.lu.se/trac/svndigest

  svndigest 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.

  svndigest 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.
*/

#include <algorithm>
#include <functional>
#include <iosfwd>
#include <string>
#include <utility>
#include <vector>

#include <sys/stat.h>

namespace theplu{
namespace svndigest{

  ///
  /// @brief Check if access permissions match \a mode. \a mode must
  /// be given as r, w, x, or combinations of these letters.
  ///
  /// @return On success (all requested permissions granted), zero
  /// is returned. On error (at least one bit in mode asked for a
  /// permission that is denied, or some other error occurred), -1
  /// is returned, and errno is set appropriately.
  ///
  /// @throw An std::runtime_error is thrown when checking for write
  /// permissions for a file/direcotry that does not exist.
  ///
  /// @see access(2)
  ///
  int access_rights(const std::string& path,const std::string& bits);

  ///
  /// @return everything after last '/'
  ///
  std::string file_name(const std::string&);

  ///
  /// @brief environment variable @a var
  ///
  std::string getenv(const std::string& var); 

  ///
  /// @brief remove trailing whitespaces
  ///
  std::string htrim(std::string str);

  ///
  /// @brief remove leading whitespaces
  ///
  std::string ltrim(std::string str);

  inline bool match_begin(std::string::const_iterator first, 
                          std::string::const_iterator last, 
                          const std::string& str)
  { return (std::distance(first, last)>=static_cast<int>(str.size()) && 
            std::equal(str.begin(), str.end(), first)); 
  }

  inline bool match_end(std::string::const_reverse_iterator first, 
                        std::string::const_reverse_iterator last, 
                        const std::string& str)
  { return (std::distance(first,last)>=static_cast<int>(str.size()) && 
            std::equal(str.rbegin(), str.rend(), first)); 
  }

  ///
  /// Create directory \a dir. The call can fail in many ways, cf. 'man
  /// mkdir'.
  ///
  inline int mkdir(const std::string& dir) { return ::mkdir(dir.c_str(),0777); }

  ///
  /// @brief Check whether \a path already exists or not.
  ///
  /// @return True if \a path exists, false otherwise.
  ///
  bool node_exist(const std::string& path);

  ///
  /// @return the current working directory.
  ///
  std::string pwd(void);

  inline std::string::iterator search(std::string::iterator& first, 
                                      std::string::iterator& last, 
                                      const std::string& str)
  { return std::search(first, last, str.begin(), str.end()); }

  ///
  ///
  ///
  time_t str2time(const std::string&);

  ///
  /// remove leading and trailing whitespaces
  ///
  inline std::string trim(std::string str) { return htrim(ltrim(str)); }

  ///
  /// Calculating sum of two vectors.
  ///
  /// @return resulting vector
  ///
  template <typename T >
  struct VectorPlus : 
    public std::binary_function<std::vector<T>,std::vector<T>,std::vector<T> >
  {
    std::vector<T> operator()(const std::vector<T>& u,
                              const std::vector<T>& v) const 
    {
      if ( u.size() > v.size() ){
        std::vector<T> res(u.size());
        transform(u.begin(), u.end(), v.begin(), res.begin(), std::plus<T>());
        copy(u.begin()+v.size(), u.end(), res.begin()+v.size());
        return res;
      }
  
      std::vector<T> res(v.size());
      transform(v.begin(), v.end(), u.begin(), res.begin(), std::plus<T>());
      if ( v.size() > u.size() )
        copy(v.begin()+u.size(), v.end(), res.begin()+u.size());
      return res;
    }

  };

  ///
  /// @return resulting vector
  ///
  template <typename Key, typename T>
  struct PairValuePlus :
    public std::binary_function<std::vector<T>,
                                std::pair<const Key, std::vector<T> >, 
                                std::vector<T> >
  {
    std::vector<T> operator()(const std::vector<T>& sum, 
                              const std::pair<const Key,std::vector<T> >& p)
    {
      return VectorPlus<T>()(sum, p.second);
    }
  };

}} // end of namespace svndigest end of namespace theplu

#endif