105 lines
3.6 KiB
C++
105 lines
3.6 KiB
C++
//
|
|
// Copyright 2019 The Abseil Authors.
|
|
//
|
|
// 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
|
|
//
|
|
// https://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.
|
|
|
|
#ifndef ABSL_FLAGS_INTERNAL_USAGE_H_
|
|
#define ABSL_FLAGS_INTERNAL_USAGE_H_
|
|
|
|
#include <iosfwd>
|
|
#include <string>
|
|
|
|
#include "absl/base/config.h"
|
|
#include "absl/flags/commandlineflag.h"
|
|
#include "absl/flags/declare.h"
|
|
#include "absl/strings/string_view.h"
|
|
|
|
// --------------------------------------------------------------------
|
|
// Usage reporting interfaces
|
|
|
|
namespace absl {
|
|
ABSL_NAMESPACE_BEGIN
|
|
namespace flags_internal {
|
|
|
|
// The format to report the help messages in.
|
|
enum class HelpFormat {
|
|
kHumanReadable,
|
|
};
|
|
|
|
// Streams the help message describing `flag` to `out`.
|
|
// The default value for `flag` is included in the output.
|
|
void FlagHelp(std::ostream& out, const CommandLineFlag& flag,
|
|
HelpFormat format = HelpFormat::kHumanReadable);
|
|
|
|
// Produces the help messages for all flags matching the filter. A flag matches
|
|
// the filter if it is defined in a file with a filename which includes
|
|
// filter string as a substring. You can use '/' and '.' to restrict the
|
|
// matching to a specific file names. For example:
|
|
// FlagsHelp(out, "/path/to/file.");
|
|
// restricts help to only flags which resides in files named like:
|
|
// .../path/to/file.<ext>
|
|
// for any extension 'ext'. If the filter is empty this function produces help
|
|
// messages for all flags.
|
|
void FlagsHelp(std::ostream& out, absl::string_view filter,
|
|
HelpFormat format, absl::string_view program_usage_message);
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
// If any of the 'usage' related command line flags (listed on the bottom of
|
|
// this file) has been set this routine produces corresponding help message in
|
|
// the specified output stream and returns:
|
|
// 0 - if "version" or "only_check_flags" flags were set and handled.
|
|
// 1 - if some other 'usage' related flag was set and handled.
|
|
// -1 - if no usage flags were set on a commmand line.
|
|
// Non negative return values are expected to be used as an exit code for a
|
|
// binary.
|
|
int HandleUsageFlags(std::ostream& out,
|
|
absl::string_view program_usage_message);
|
|
|
|
// --------------------------------------------------------------------
|
|
// Globals representing usage reporting flags
|
|
|
|
enum class HelpMode {
|
|
kNone,
|
|
kImportant,
|
|
kShort,
|
|
kFull,
|
|
kPackage,
|
|
kMatch,
|
|
kVersion,
|
|
kOnlyCheckArgs
|
|
};
|
|
|
|
// Returns substring to filter help output (--help=substr argument)
|
|
std::string GetFlagsHelpMatchSubstr();
|
|
// Returns the requested help mode.
|
|
HelpMode GetFlagsHelpMode();
|
|
// Returns the requested help format.
|
|
HelpFormat GetFlagsHelpFormat();
|
|
|
|
// These are corresponding setters to the attributes above.
|
|
void SetFlagsHelpMatchSubstr(absl::string_view);
|
|
void SetFlagsHelpMode(HelpMode);
|
|
void SetFlagsHelpFormat(HelpFormat);
|
|
|
|
// Deduces usage flags from the input argument in a form --name=value or
|
|
// --name. argument is already split into name and value before we call this
|
|
// function.
|
|
bool DeduceUsageFlags(absl::string_view name, absl::string_view value);
|
|
|
|
} // namespace flags_internal
|
|
ABSL_NAMESPACE_END
|
|
} // namespace absl
|
|
|
|
#endif // ABSL_FLAGS_INTERNAL_USAGE_H_
|