87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <boost/program_options.hpp>
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#include <folly/Optional.h>
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#include <folly/portability/GFlags.h>
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namespace folly {
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enum class ProgramOptionsStyle {
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GFLAGS,
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GNU,
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};
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// Add all GFlags to the given options_description.
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// Use this *instead of* gflags::ParseCommandLineFlags().
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//
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// in GFLAGS style, the flags are named as per gflags conventions:
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// names_with_underscores
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// boolean flags have a "no" prefix
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//
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// in GNU style, the flags are named as per GNU conventions:
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// names-with-dashes
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// boolean flags have a "no-" prefix
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//
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// Consider (for example) a boolean flag:
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// DEFINE_bool(flying_pigs, false, "...");
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//
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// In GFLAGS style, the corresponding flags are named
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// flying_pigs
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// noflying_pigs
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//
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// In GNU style, the corresponding flags are named
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// flying-pigs
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// no-flying-pigs
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//
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// You may not pass arguments to boolean flags, so you must use the
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// "no" / "no-" prefix to set them to false; "--flying_pigs false"
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// and "--flying_pigs=false" are not allowed, to prevent ambiguity.
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boost::program_options::options_description getGFlags(
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ProgramOptionsStyle style = ProgramOptionsStyle::GNU);
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// Helper when parsing nested command lines:
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//
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// program [--common_options...] command [--command_options...] args
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//
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// The result has "command" set to the first positional argument, if any,
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// and "rest" set to the remaining options and arguments. Note that any
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// unrecognized flags must appear after the command name.
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//
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// You may pass "rest" to parseNestedCommandLine again, etc.
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struct NestedCommandLineParseResult {
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NestedCommandLineParseResult() {}
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boost::program_options::parsed_options options{nullptr};
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Optional<std::string> command;
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std::vector<std::string> rest;
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};
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NestedCommandLineParseResult parseNestedCommandLine(
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int argc,
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const char* const argv[],
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const boost::program_options::options_description& desc);
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NestedCommandLineParseResult parseNestedCommandLine(
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const std::vector<std::string>& cmdline,
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const boost::program_options::options_description& desc);
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} // namespace folly
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