artdaq_demo  3.13.00
readfhicl.cc
1 #include <iostream>
2 #include "fhiclcpp/ParameterSet.h"
3 
4 #include <boost/program_options.hpp>
5 
6 using namespace fhicl;
7 namespace bpo = boost::program_options;
8 
9 int main(int argc, char* argv[])
10 try
11 {
12  // Get the input parameters via the boost::program_options library,
13  // designed to make it relatively simple to define arguments and
14  // issue errors if argument list is supplied incorrectly
15 
16  std::ostringstream descstr;
17  descstr << *argv << " <-c <config-file>> <other-options>";
18 
19  bpo::options_description desc = descstr.str();
20 
21  desc.add_options()("config,c", bpo::value<std::string>(), "Configuration file.")("help,h",
22  "produce help message");
23 
24  bpo::variables_map vm;
25 
26  try
27  {
28  bpo::store(bpo::command_line_parser(argc, argv).options(desc).run(), vm);
29  bpo::notify(vm);
30  }
31  catch (bpo::error const& e)
32  {
33  std::cerr << "Exception from command line processing in " << *argv << ": " << e.what() << "\n";
34  return -1;
35  }
36 
37  if (vm.count("help") != 0u)
38  {
39  std::cout << desc << std::endl;
40  return 1;
41  }
42  if (vm.count("config") == 0u)
43  {
44  std::cerr << "Exception from command line processing in " << *argv << ": no configuration file given.\n"
45  << "For usage and an options list, please do '" << *argv << " --help"
46  << "'.\n";
47  return 2;
48  }
49 
50  // Check the directories defined by the FHICL_FILE_PATH
51  // environmental variable for the *.fcl file whose name was passed to
52  // the command line. If not defined, look in the current directory.
53 
54  if (getenv("FHICL_FILE_PATH") == nullptr)
55  {
56  std::cerr << "INFO: environment variable FHICL_FILE_PATH was not set. Using \".\"\n";
57  setenv("FHICL_FILE_PATH", ".", 0);
58  }
59 
60  auto file_name = vm["config"].as<std::string>();
61  auto filepath_maker = cet::filepath_lookup("FHICL_FILE_PATH");
62 
63  auto complete_pset = fhicl::ParameterSet::make(file_name, filepath_maker);
64 
65  std::cout << complete_pset.to_indented_string(0, false) << "\n";
66 
67  return 0;
68 }
69 
70 catch (std::exception const& x)
71 {
72  std::cerr << "Exception (type std::exception) caught in driver: " << x.what() << "\n";
73  return 1;
74 }
75 catch (...)
76 {
77  return -1;
78 }