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filesystem.md

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namespace std::filesystem

C++14 Windows C++17 
#include <windows.h>

void copy_foobar() {
  std::wstring dir = L"\\sandbox";
  std::wstring p = dir + L"\\foobar.txt";
  std::wstring copy = p;
  copy += ".bak";
  CopyFile(p, copy, false);
  
  std::string dir_copy = dir + ".bak";
  SHFILEOPSTRUCT s = { 0 };
  s.hwnd = someHwndFromSomewhere;
  s.wFunc = FO_COPY;
  s.fFlags = FOF_SILENT;
  s.pFrom = dir.c_str();
  s.pTo = dir_copy.c_str();
  SHFileOperation(&s);
}

void display_contents(std::wstring const & p) {
  std::cout << p << "\n";

  std::wstring search = p + "\\*";
  WIN32_FIND_DATA ffd;
  HANDLE hFind =
        FindFirstFile(search.c_str(), &ffd);
  if (hFind == INVALID_HANDLE_VALUE)
     return;
  
  do {
    if ( ffd.dwFileAttributes
         & FILE_ATTRIBUTE_DIRECTORY) {
      std::cout << "  " << ffd.cFileName << "\n";
    } else {
      LARGE_INTEGER filesize;
      filesize.LowPart = ffd.nFileSizeLow;
      filesize.HighPart = ffd.nFileSizeHigh;
      std::cout << "  " << ffd.cFileName
                << " [" << filesize.QuadPart
                << " bytes]\n";
    }
  } while (FindNextFile(hFind, &ffd) != 0);
}
 
#include <filesystem>
#include <iostream>
namespace fs = std::filesystem;

void copy_foobar() {
  fs::path dir = "/";
  dir /= "sandbox";
  fs::path p = dir / "foobar.txt";
  fs::path copy = p;
  copy += ".bak";
  fs::copy(p, copy);
  fs::path dir_copy = dir;
  dir_copy += ".bak";
  fs::copy(dir, dir_copy, fs::copy_options::recursive);
}

void display_contents(fs::path const & p) {
  std::cout << p.filename() << "\n";

  if (!fs::is_directory(p))
    return;

  for (auto const & e: fs::directory_iterator{p}) {
    if (fs::is_regular_file(e.status())) {
      std::cout << "  " << e.path().filename()
                << " [" << fs::file_size(e) << " bytes]\n";
    } else if (fs::is_directory(e.status())) {
      std::cout << "  " << e.path().filename() << "\n";
    }
  }
}
C++14 POSIX 
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>

void copy_foobar() {

// [TODO]
// to copy file, use fread / fwrite

// how to copy directory...?
}

void display_contents(std::string const & p) {
  std::cout << p << "\n";

  struct dirent *dp;
  DIR *dfd;
  
  if ((dfd = opendir(p.c_str()) == nullptr)
    return;

  while((dp = readdir(dfd)) != nullptr) {
    struct stat st;
    string filename = p + "/" + dp->d_Name;
    if (stat(filename.c_str(), &st) == -1)
      continue;
      
    if ((st.st_mode & S_IFMT) == S_IFDIR)
      std::cout << "  " << filename << "\n";
    } else {
      std::cout << "  " << filename
                << " [" << st.st_size
                << " bytes]\n";
    }
  }
}