generateVersionAndContext.cc

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#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fstream>
#include <ctime>

int main(int argc, char *argv[])
{

  if (argc != 2) {
    std::cerr <<  " usage: generateVersionAndContext <cmake source directory> " << std::endl;
    return 1;
  }

  FILE *fp;
  char gitRes[1035];
  std::string cMakeDirectoryStr(argv[1]);
  char *g4lbneDirChr = getenv("G4LBNE_DIR");
  if (g4lbneDirChr == 0) {
    std::cerr <<  " Environment variable G4LBNE_DIR not set.... " << std::endl;
    return 1;
  }
//  std::string g4lbneDirStr(g4lbneDirChr);
  chdir(g4lbneDirChr);
  std::string g4lbneDirStr(g4lbneDirChr);
  if (cMakeDirectoryStr != g4lbneDirStr) {
    std::cerr << " Possible confusion on where the source was installed, CMake src  " << 
      cMakeDirectoryStr << " env. var. from setup " << g4lbneDirStr << std::endl;
  }
  /* Open the command for reading. */
  fp = popen("git describe --all", "r");
  if (fp == 0) {
    std::cerr << "Failed to run the git command" << std::endl;
    exit(1);
  }
  fgets(gitRes, sizeof(gitRes)-1, fp);
  // remove the last character, 
  std::string gitResStr(gitRes); 
  gitResStr = gitResStr.substr(0, gitResStr.length()-1);
  std::cerr << " git version.. " << gitResStr << std::endl;
  
  std::ofstream fOutCC("./VersionAndContext.cc");
  fOutCC << "#include <iostream>" << std::endl;
  fOutCC << "#include <stdlib.h>" << std::endl;
  fOutCC << "#include <stdio.h>" << std::endl;
  fOutCC << "#include <unistd.h>" << std::endl;
  fOutCC << "#include <fstream>" << std::endl << std::endl;
  fOutCC << "#include \"VersionAndContext.hh\" " << std::endl << std::endl;
  fOutCC <<  "VersionAndContext::VersionAndContext():" << std::endl;
  fOutCC <<  "  gitDescription(\""<< gitResStr << "\")," << std::endl;
  fOutCC <<  "  g4lbnfDir(\""<< g4lbneDirStr << "\")," << std::endl;
  time_t t = time(0);   // get time now
  struct tm * now = localtime( & t );
  char       bufTime[80];
    // Visit http://en.cppreference.com/w/cpp/chrono/c/strftime
    // for more information about date/time format
  strftime(bufTime, sizeof(bufTime), "%Y-%m-%d.%X", now);
  fOutCC <<  "  buildTimeStamp(\"" << std::string(bufTime)
         << "\") "  << std::endl;
  
  fOutCC << " { ; } " << std::endl << std::endl;
  fOutCC << "VersionAndContext* VersionAndContext::fInstance = 0; " << std::endl << std::endl;
  fOutCC << "VersionAndContext* VersionAndContext::Instance() { " << std::endl; 
  fOutCC << "  if (fInstance == 0) fInstance = new VersionAndContext(); " << std::endl; 
  fOutCC << "  return fInstance; } " << std::endl; 
  
  fOutCC.close();
  return 0;
}