Abseil Common Libraries (C++) (grcp 依赖)
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80 lines
2.9 KiB
80 lines
2.9 KiB
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// Copyright 2019 The Abseil Authors. |
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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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// https://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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#ifndef ABSL_FLAGS_INTERNAL_USAGE_H_ |
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#define ABSL_FLAGS_INTERNAL_USAGE_H_ |
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#include <iosfwd> |
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#include <string> |
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#include "absl/flags/declare.h" |
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#include "absl/flags/internal/commandlineflag.h" |
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#include "absl/strings/string_view.h" |
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// -------------------------------------------------------------------- |
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// Usage reporting interfaces |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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namespace flags_internal { |
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// The format to report the help messages in. |
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enum class HelpFormat { |
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kHumanReadable, |
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}; |
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// Outputs the help message describing specific flag. |
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void FlagHelp(std::ostream& out, const flags_internal::CommandLineFlag& flag, |
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HelpFormat format = HelpFormat::kHumanReadable); |
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// Produces the help messages for all flags matching the filter. A flag matches |
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// the filter if it is defined in a file with a filename which includes |
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// filter string as a substring. You can use '/' and '.' to restrict the |
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// matching to a specific file names. For example: |
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// FlagsHelp(out, "/path/to/file."); |
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// restricts help to only flags which resides in files named like: |
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// .../path/to/file.<ext> |
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// for any extension 'ext'. If the filter is empty this function produces help |
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// messages for all flags. |
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void FlagsHelp(std::ostream& out, absl::string_view filter, |
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HelpFormat format, absl::string_view program_usage_message); |
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// -------------------------------------------------------------------- |
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// If any of the 'usage' related command line flags (listed on the bottom of |
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// this file) has been set this routine produces corresponding help message in |
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// the specified output stream and returns: |
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// 0 - if "version" or "only_check_flags" flags were set and handled. |
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// 1 - if some other 'usage' related flag was set and handled. |
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// -1 - if no usage flags were set on a commmand line. |
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// Non negative return values are expected to be used as an exit code for a |
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// binary. |
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int HandleUsageFlags(std::ostream& out, |
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absl::string_view program_usage_message); |
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} // namespace flags_internal |
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ABSL_NAMESPACE_END |
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} // namespace absl |
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ABSL_DECLARE_FLAG(bool, help); |
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ABSL_DECLARE_FLAG(bool, helpfull); |
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ABSL_DECLARE_FLAG(bool, helpshort); |
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ABSL_DECLARE_FLAG(bool, helppackage); |
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ABSL_DECLARE_FLAG(bool, version); |
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ABSL_DECLARE_FLAG(bool, only_check_args); |
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ABSL_DECLARE_FLAG(std::string, helpon); |
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ABSL_DECLARE_FLAG(std::string, helpmatch); |
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#endif // ABSL_FLAGS_INTERNAL_USAGE_H_
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