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/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "Options.h"
#include "qpid/Exception.h"
#include <fstream>
#include <algorithm>
#include <iostream>
namespace qpid {
using namespace std;
namespace {
const std::string prefix("QPID_");
char env2optchar(char env) { return (env=='_') ? '-' : tolower(env); }
struct Mapper {
Mapper(const Options& o) : opts(o) {}
string operator()(const string& env) {
if (env.substr(0, prefix.size()) == prefix) {
string opt = env.substr(prefix.size());
transform(opt.begin(), opt.end(), opt.begin(), env2optchar);
// Ignore env vars that don't match to known options.
if (opts.find_nothrow(opt, false))
return opt;
}
return string();
}
const Options& opts;
};
}
std::string prettyArg(const std::string& name, const std::string& value) {
return value.empty() ? name : name+" (="+value+")";
}
Options::Options(const string& name) : po::options_description(name) {}
void Options::parse(int argc, char** argv, const std::string& configFile)
{
string parsing;
try {
po::variables_map vm;
parsing="command line options";
po::store(po::parse_command_line(argc, argv, *this), vm);
parsing="environment variables";
po::store(po::parse_environment(*this, Mapper(*this)), vm);
po::notify(vm); // configFile may be updated from arg/env options.
if (!configFile.empty()) {
parsing="configuration file "+configFile;
ifstream conf(configFile.c_str());
if (conf.good()) {
conf.exceptions(ifstream::failbit|ifstream::badbit);
po::store(po::parse_config_file(conf, *this), vm);
}
}
po::notify(vm);
}
catch (const std::exception& e) {
ostringstream msg;
msg << "Error in " << parsing << ": " << e.what() << endl;
if (find_nothrow("help", false))
msg << "Use --help to see valid options" << endl;
throw Exception(msg.str());
}
}
CommonOptions::CommonOptions(const string& name) : Options(name) {
addOptions()
("help,h", optValue(help), "Print help message.")
("version,v", optValue(version), "Print version information.")
("config", optValue(config, "FILE"), "Configuation file.");
}
} // namespace qpid
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