buildaux/version.cpp

   1 #include <cstdio>
   2 #include <cstdlib>
   3 #include <string>
   4 #include <iostream>
   5 #include <sstream>
   6 #include <fstream>
   7
   8 std::string X = "$Format:%h by %cn on %ci$";
   9
  10 std::string derive_format(std::string kwformat)
  11 {
  12         if(kwformat[0] != '$' || kwformat[1] != 'F' || kwformat[kwformat.length() - 1] != '$') {
  13                 std::cerr << "Bad keyword format '" << kwformat << "'" << std::endl;
  14                 exit(1);
  15         }
  16         return "--pretty=f" + kwformat.substr(2, kwformat.length() - 3);
  17 }
  18
  19 std::string shellquote(std::string arg)
  20 {
  21         std::ostringstream x;
  22         x << "'";
  23         for(size_t i = 0; i < arg.length(); i++) {
  24                 if(arg[i] == '\'')
  25                         x << "\\'";
  26                 else
  27                         x << arg[i];
  28         }
  29         x << "'";
  30         return x.str();
  31 }
  32
  33 std::string runlog(std::string logformat)
  34 {
  35         std::string command = "git log " + shellquote(logformat) + " -1";
  36         std::string retval;
  37         int r;
  38         char buf[4096] = {0};
  39         FILE* out = popen(command.c_str(), "r");
  40         if(!out) {
  41                 std::cerr << "Can't invoke git to get the version" << std::endl;
  42                 exit(1);
  43         }
  44         while((r = fread(buf, 1, 4095, out)) > 0) {
  45                 buf[r] = 0;
  46                 retval = retval + buf;
  47         }
  48         if(ferror(out)) {
  49                 std::cerr << "Error reading git version output" << std::endl;
  50                 exit(1);
  51         }
  52         pclose(out);
  53         return retval;
  54 }
  55
  56 std::string get_main_version()
  57 {
  58         std::ifstream x("VERSION");
  59         if(!x) {
  60                 std::cerr << "Error reading main version" << std::endl;
  61                 exit(1);
  62         }
  63         std::string out;
  64         std::getline(x, out);
  65         if(out == "") {
  66                 std::cerr << "Error reading main version" << std::endl;
  67                 exit(1);
  68         }
  69         return out;
  70 }
  71
  72 int main()
  73 {
  74         std::string gitversion;
  75         std::string mainversion = get_main_version();
  76         if(X[0] == '$') {
  77                 std::string logformat = derive_format(X);
  78                 gitversion = runlog(logformat);
  79         } else
  80                 gitversion = X;
  81         std::cout << "#include <string>" << std::endl;
  82         std::cout << "std::string lsnes_git_revision = \"" << gitversion << "\";" << std::endl;
  83         std::cout << "std::string lsnes_version = \"" << mainversion << "\";" << std::endl;
  84         return 0;
  85 }