JGlob.hh

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#ifndef __JSYSTEM_JGLOB__
#define __JSYSTEM_JGLOB__

#include <glob.h>
#include <string.h>
#include <string>
#include <vector>

#include "JLang/JException.hh"


/**
 * \file
 * File list.
 * \author mdejong
 */
namespace JSYSTEM {}
namespace JPP { using namespace JSYSTEM; }

namespace JSYSTEM {

  using JLANG::JRunTimeException;

  /**
   * Auxiliary class to list files.
   */
  struct JGlob :
    public std::vector<std::string>
  {
    /**
     * Default constructor.
     */
    JGlob()
    {}


    /**
     * Constructor.
     *
     * \param  pattern     pattern
     */
    JGlob(const std::string& pattern)
    {
      (*this)(pattern);
    }


    /**
     * Constructor.
     *
     * \param  buffer      list of patterns
     */
    JGlob(const std::vector<std::string>& buffer)
    {
      (*this)(buffer);
    }
    

    /**
     * Get list of files.
     *
     * \param  pattern     pattern
     * \return             list of files
     */
    const JGlob& operator()(const std::string& pattern)
    {
      this->clear();

      evaluate(pattern);

      return *this;
    }
   

    /**
     * Get list of files.
     *
     *
     * \param  buffer      list of patterns
     * \return             list of files
     */
    const JGlob& operator()(const std::vector<std::string>& buffer)
    {
      this->clear();

      for (const std::string& pattern : buffer) {
        evaluate(pattern);
      }

      return *this;
    }


  private:
    /**
     * Process pattern.
     *
     * \param  pattern     pattern
     */
    void evaluate(const std::string& pattern)
    {
      memset(&buffer, 0, sizeof(buffer));

      const int value = glob(pattern.c_str(), GLOB_TILDE, NULL, &buffer);

      if (value != 0) {

        globfree(&buffer);

        THROW(JRunTimeException, "glob() failed " << pattern << " error " << value);
      }

      for(size_t i = 0; i < buffer.gl_pathc; ++i) {
        this->push_back(buffer.gl_pathv[i]);
      }

      globfree(&buffer);
    }

    glob_t buffer;
  };


  /**
   * Function object to get list of files for given pattern.
   */
  static  JGlob  getFilenames;
}

#endif