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add first environment variable parser to read config files user specific

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This commit is contained in:
Dominik Kuhn 2022-09-27 20:25:14 +01:00
parent 19f2d650be
commit 6ef0fdae55
1 changed files with 44 additions and 0 deletions
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44
main.cpp
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@ -276,6 +276,19 @@ void validate(boost::any& v,
}
std::string mapper(std::string env_var)
{
// ensure the env_var is all caps
std::transform(env_var.begin(), env_var.end(), env_var.begin(), ::toupper);
if (env_var == "PATH") return "path";
if (env_var == "EXAMPLE_VERBOSE") return "verbosity";
if (env_var == "HOSTNAME") return "hostname";
if (env_var == "HOME") return "home";
return "";
}
//////////////////////////////////////////////////
// MAIN - INITIALIZATION AND STARTUP
@ -297,6 +310,37 @@ int main(int argc, char *argv[])
{
osjob_t initjob;
std::string hostname;
boost::program_options::options_description desc_env;
desc_env.add_options() ("path", "the execution path")
("home", "the home directory of the executing user")
("verbosity", po::value<std::string>()->default_value("INFO"), "set verbosity: DEBUG, INFO, WARN, ERROR, FATAL")
("hostname", boost::program_options::value<std::string>(&hostname));
boost::program_options::variables_map vm_env;
boost::program_options::store(boost::program_options::parse_environment(desc_env, boost::function1<std::string, std::string>(mapper)), vm_env);
boost::program_options::notify(vm_env);
if (vm_env.count("home"))
{
std::cout << "home path: " << vm_env["home"].as<std::string>() << std::endl;
}
if (vm_env.count("path"))
{
std::cout << "First 75 chars of the system path: \n";
std::cout << vm_env["path"].as<std::string>().substr(0, 75) << std::endl;
}
std::cout << "Verbosity: " << vm_env["verbosity"].as<std::string>() << std::endl;
if ( vm_env.count("hostname"))
{
std::cout << "hostname: " << vm_env["hostname"].as<std::string>() << std::endl; // correct value of HOSTNAME environent variable
}
// set options allowed by the command line
po::options_description command_line_options("Allowed options");
command_line_options.add_options() ("help", "produce help message")