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Geant4/externals/g4tools/include/tools/fmanip

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  1 // Copyright (C) 2010, Guy Barrand. All rights reserved.
  2 // See the file tools.license for terms.
  3 
  4 #ifndef tools_fmanip
  5 #define tools_fmanip
  6 
  7 #include "file"
  8 #include "sep"
  9 #include "sout"
 10 #include <ostream>
 11 
 12 namespace tools {
 13 
 14 inline bool find_with_dirs(std::ostream& a_out,
 15                            const std::vector<std::string>& a_dirs,
 16                            const std::string& a_file,
 17                            std::string& a_path,
 18                            bool a_verbose = false ) {
 19   std::vector<std::string>::const_iterator it;
 20   for(it=a_dirs.begin();it!=a_dirs.end();++it) {
 21     if((*it).empty()) {
 22       // with a "" in dirs, this case could solve :
 23       // - a_file in the current directory.
 24       // - a_file with an absolute path name.
 25       a_path = a_file; //may be an absolute file name.
 26     } else {
 27       a_path = *it;
 28       a_path += sep();
 29       a_path += a_file;
 30     }
 31 
 32     if(a_verbose) {
 33       a_out << "find_with_dirs :"
 34             << " look for " << sout(a_path) << " ..."
 35             << std::endl;
 36     }
 37 
 38     if(file::exists(a_path)) {
 39       if(a_verbose) {
 40         a_out << "find_with_dirs :"
 41               << " found " << sout(a_path) << "."
 42               << std::endl;
 43       }
 44       return true;
 45     }
 46   }
 47   a_path.clear();
 48 
 49   if(a_verbose) {
 50     a_out << "find_with_dirs :"
 51           << " " << sout(a_file) << " not found."
 52           << std::endl;
 53   }
 54 
 55   return false;
 56 }
 57 
 58 }
 59 
 60 #include "get_env"
 61 
 62 namespace tools {
 63 
 64 inline bool find_with_env(std::ostream& a_out,
 65                           const std::string& a_env,
 66                           const std::string& a_file,
 67                           std::string& a_path,
 68                           bool a_verbose = false ) {
 69   std::string PATH;
 70   if(!get_env(a_env,PATH)) {
 71     //look for a a_file in current directory.
 72     if(file::exists(a_file)) {
 73       //a_out << "tools::find_with_env :"
 74       //      << " env variable " << sout(a_env) << " not defined, but file " << sout(a_file) << " exists."
 75       //      << std::endl;
 76       a_path = a_file;
 77       return true;
 78     }
 79     a_out << "tools::find_with_env : env variable " << sout(a_env) << " not defined." << std::endl;
 80     a_path.clear();
 81     return false;
 82   }
 83   if(a_verbose) {
 84     a_out << "find_with_env : env " << sout(a_env) << " is " << sout(PATH) << std::endl;
 85   }
 86 
 87   std::vector<std::string> dirs;
 88   words(PATH,psep(),false,dirs); //or true ?
 89 
 90   return find_with_dirs(a_out,dirs,a_file,a_path,a_verbose);
 91 }
 92 
 93 }
 94 
 95 #endif