source: branches/0.12-stable/yat/utility/utility.cc @ 3293

// $Id: utility.cc 3293 2014-07-25 03:42:58Z peter $

/*
  Copyright (C) 2005, 2006 Jari Häkkinen, Markus Ringnér
  Copyright (C) 2007, 2008 Jari Häkkinen, Peter Johansson
  Copyright (C) 2010, 2012, 2013, 2014 Peter Johansson

  This file is part of the yat library, http://dev.thep.lu.se/yat

  The yat library 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 3 of the
  License, or (at your option) any later version.

  The yat 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
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with yat. If not, see <http://www.gnu.org/licenses/>.
*/

#include <config.h>

#include "utility.h"

#include "Exception.h"
#include "FileUtil.h"
#include "stl_utility.h"

#include <cassert>
#include <fnmatch.h>
#include <fstream>
#include <sstream>
#include <string>
#include <sys/stat.h>

namespace theplu {
namespace yat {
namespace utility {

  std::string basename(const std::string& path)
  {
    if (path.size()==1)
      return path;
    size_t pos = path.find_last_of('/');
    if (pos==std::string::npos)
      return path;
    if (pos==path.size()-1)
      return basename(path.substr(0, path.size()-1));
    return path.substr(pos+1);
  }


  void chdir(const std::string& dir)
  {
    if (::chdir(dir.c_str()) )
      throw errno_error("chdir: " + dir + ":");
  }


  void chmod(const std::string& filename, mode_t mode)
  {
    if (::chmod(filename.c_str(), mode))
      throw errno_error("chmod: ");
  }


  void copy_file(const std::string& source, const std::string& target)
  {
    std::ifstream is;
    std::ofstream os;

    is.open(source.c_str(), std::ios::in | std::ios::binary);
    os.open(target.c_str(), std::ios::out | std::ios::binary);
    os << is.rdbuf();
    if (!os.good()) {
      std::ostringstream ss;
      ss << "copy_file failed writing to '" << target << "'\n";
      throw runtime_error(ss.str());
    }
    if (is.bad() || is.fail()) {
      std::ostringstream ss;
      ss << "copy_file failed reading from '" << source << "'\n";
      throw runtime_error(ss.str());
    }
    is.close();
    os.close();

    // copy permissions
    struct stat nodestat;
    stat(source.c_str(), &nodestat);
    chmod(target.c_str(), nodestat.st_mode);
  }


  std::string dirname(const std::string& path)
  {
    if (path.size()==1) {
      if (path=="/")
        return path;
      else
        return ".";
    }
    assert(path.size()>=2);
    size_t pos = path.find_last_of('/', path.size()-2);
    if (pos==std::string::npos)
      return ".";
    if (pos==0)
      return "/";
    return path.substr(0,pos);
  }


  bool fnmatch(const std::string& pattern, const std::string& str, int flags)
  {
    int res = ::fnmatch(pattern.c_str(), str.c_str(), flags);
    if (res==0)
      return true;
    if (res!=FNM_NOMATCH) {
      std::stringstream ss;
      ss << "fnmatch(" << pattern << ", " << str << ")";
      throw runtime_error(ss.str());
    }
    return false;
  }


  bool is_double(const std::string& s)
  {
    return is<double>(s);
  }
  

  bool is_equal(std::string s, std::string other)
  {
    std::stringstream ss(s);
    std::string s2;
    ss >> s2; // to trim surrounding whitespaces
    to_lower(s2);
    if (s2!=other)
      return false;
    // Check that nothing is left on stream
    std::string s3;
    ss >> s3;
    return s3.empty();
  }


  bool is_float(const std::string& s)
  {
    return is<float>(s);
  }


  bool is_int(const std::string& s)
  {
    return is<int>(s);
  }

  bool is_nan(const std::string& s)
  {
    return is_equal(s, "nan");
  }


  void mkdir(const std::string& dir, mode_t mode)
  {
    int code = ::mkdir(dir.c_str(), mode);
    if (code){
      std::stringstream ss;
      ss << "mkdir: '" << dir << "': ";
      throw yat::utility::errno_error(ss.str());
    }
  }


  void mkdir_p(const std::string& dir, mode_t mode)
  {
    if (FileUtil(dir).exists())
      return;
    mkdir_p(dirname(dir), mode);
    mkdir(dir, mode);
  }


  void remove(const std::string& fn)
  {
    if (::remove(fn.c_str())) {
      std::string msg("remove: ");
      msg += fn;
      throw errno_error(msg);
    }
  }


  void rename(const std::string& from, const std::string& to)
  {
    if (::rename(from.c_str(), to.c_str())) {
      std::stringstream ss;
      ss << "rename" << from << " to " << to << ": ";
      throw errno_error(ss.str());
    }
  }


  void replace(std::string& str, std::string old_value, std::string new_value)
  {
    assert(old_value.size());
    std::string result;
    std::back_insert_iterator<std::string> out(result);
    std::string::iterator c = str.begin();
    while (c!=str.end()) {
      if (str.end() - c >= static_cast<int>(old_value.size()) &&
          std::equal(old_value.begin(), old_value.end(), c)) {
        std::copy(new_value.begin(), new_value.end(), out);
        c += old_value.size();
      }
      else {
        *out = *c;
        ++c;
      }
    }
    str.swap(result);
  }


}}} // end of namespace utility, yat and thep