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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 <boost/bind.hpp>
#include <fstream>
#include <algorithm>
#include <iostream>
namespace qpid {
using namespace std;
namespace {
struct EnvOptMapper {
static bool matchChar(char env, char opt) {
return (env==toupper(opt)) || (strchr("-.", opt) && env=='_');
}
static bool matchStr(const string& env, boost::shared_ptr<po::option_description> desc) {
return std::equal(env.begin(), env.end(), desc->long_name().begin(), &matchChar);
}
static bool matchCase(const string& env, boost::shared_ptr<po::option_description> desc) {
return env == desc->long_name();
}
EnvOptMapper(const Options& o) : opts(o) {}
string operator()(const string& envVar) {
static const std::string prefix("QPID_");
if (envVar.substr(0, prefix.size()) == prefix) {
string env = envVar.substr(prefix.size());
typedef const std::vector< boost::shared_ptr<po::option_description> > OptDescs;
OptDescs::const_iterator i =
find_if(opts.options().begin(), opts.options().end(), boost::bind(matchStr, env, _1));
if (i != opts.options().end())
return (*i)->long_name();
}
return string();
}
string configFileLine (string& line) {
size_t pos = line.find ('=');
if (pos == string::npos)
return string();
string key = line.substr (0, pos);
typedef const std::vector< boost::shared_ptr<po::option_description> > OptDescs;
OptDescs::const_iterator i =
find_if(opts.options().begin(), opts.options().end(), boost::bind(matchCase, key, _1));
if (i != opts.options().end())
return string (line) + "\n";
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, bool allowUnknown)
{
string defaultConfigFile = configFile; // May be changed by env/cmdline
string parsing;
try {
po::variables_map vm;
parsing="command line options";
if (argc > 0 && argv != 0) {
if (allowUnknown) {
// This hideous workaround is required because boost 1.33 has a bug
// that causes 'allow_unregistered' to not work.
po::command_line_parser clp = po::command_line_parser(argc, argv).
options(*this).allow_unregistered();
po::parsed_options opts = clp.run();
po::parsed_options filtopts = clp.run();
filtopts.options.clear ();
for (std::vector< po::basic_option<char> >::iterator i = opts.options.begin();
i != opts.options.end(); i++)
if (!i->unregistered)
filtopts.options.push_back (*i);
po::store(filtopts, vm);
}
else
po::store(po::parse_command_line(argc, argv, *this), vm);
}
parsing="environment variables";
po::store(po::parse_environment(*this, EnvOptMapper(*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()) {
// Remove this hack when we get a stable version of boost that
// can allow unregistered options in config files.
EnvOptMapper mapper(*this);
stringstream filtered;
while (!conf.eof()) {
string line;
getline (conf, line);
filtered << mapper.configFileLine (line);
}
po::store(po::parse_config_file(filtered, *this), vm);
// End of hack
}
else {
// No error if default configfile is missing/unreadable
// but complain for non-default config file.
if (configFile != defaultConfigFile)
throw Exception("cannot read configuration file "
+configFile);
}
}
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, const string& configfile)
: Options(name), config(configfile)
{
addOptions()
("help,h", optValue(help), "Displays the help message")
("version,v", optValue(version), "Displays version information")
("config", optValue(config, "FILE"), "Reads configuration from FILE");
}
} // namespace qpid
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