File.h

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// -*- C++ -*-
#ifndef COIL_FILE_H
#define COIL_FILE_H

#include <cstring>
#include <sys/types.h>
#include <dirent.h>
#include <libgen.h>

#include <coil/config_coil.h>
#include <coil/stringutil.h>

namespace coil
{

  inline std::string dirname(char* path)
  {
    char path_name[strlen(path)+1];
    strcpy(path_name, path);
    std::string dir_name = ::dirname(path);
    return dir_name;
  }

  inline std::string basename(const char* path)
  {
    char path_name[strlen(path)+1];
    strcpy(path_name, path);
    std::string base_name = ::basename(path_name);
    return base_name;
  }

  inline coil::vstring filelist(const char* path, const char* glob_str = "")
  {
    struct dirent* ent; 
    coil::vstring flist;
    bool has_glob(false);
    std::string pattern;

    if (path == 0) { return flist; }
    if (glob_str[0] != '\0') { has_glob = true; }

    DIR* dir_ptr(::opendir(path));
    if (dir_ptr == 0) { return flist; }
    
    while ((ent = ::readdir(dir_ptr)) != 0)
      {
        bool match(true);
        if (has_glob)
          {
            const char* globc(glob_str);
            std::string fname(ent->d_name);
            for (size_t i(0); i < fname.size() && globc != '\0'; ++i, ++globc)
              {
                if (*globc == '*')
                  {
                    // the last '*' matches every thing
                    if (globc[1] == '\0') { break; }
                    // consecutive * or + are skiped, but fname keeps pointer
                    if (globc[1] == '*' || globc[1] == '+') { --i; continue; }

                    // advance pointer and find normal characters
                    ++globc;
                    size_t pos(fname.find(*globc, i));
                    if (pos == std::string::npos) { match = false; break; }
                    // matched, and advance i to pos
                    i = pos;
                  }
                else if (*globc == '+')
                  {
                    // the last '+' matches last one or more characters
                    if (globc[1] == '\0' && !(i + 1 < fname.size())) { break; }
                    // consecutive * or + are skiped, but fname keeps pointer
                    if (globc[1] == '*' || globc[1] == '+') { --i; continue; }

                    // advance pointer and find normal characters
                    ++globc;
                    size_t pos(fname.find(*globc, i + 1));
                    if (pos == std::string::npos) { match = false; break; }
                    // matched, and advance i to pos
                    i = pos;
                  }
                else
                  {
                    if (fname[i] != *globc) { match = false; }
                  }
                
                // in the last fname character, if glob is not end,
                // or *, fname is not matched.
                if (i + 1 == fname.size() && 
                    globc[1] != '\0' && globc[1] != '*') { match = false; }
              }
          }
        if (match) { flist.push_back(ent->d_name); }
      }
    ::closedir(dir_ptr);

    return flist;
  }
};

#endif // COIL_FILE_H