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// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
//
// 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.
#ifndef INCLUDED_SRC_BUILDTOOL_LOGGING_LOG_SINK_CMDLINE_HPP
#define INCLUDED_SRC_BUILDTOOL_LOGGING_LOG_SINK_CMDLINE_HPP
#include <iterator>
#include <memory>
#include <mutex>
#include <sstream>
#include <string>
#include "fmt/color.h"
#include "fmt/core.h"
#include "src/buildtool/logging/log_sink.hpp"
#include "src/buildtool/logging/logger.hpp"
class LogSinkCmdLine final : public ILogSink {
public:
static auto CreateFactory(bool colored = true) -> LogSinkFactory {
return [=]() { return std::make_shared<LogSinkCmdLine>(colored); };
}
explicit LogSinkCmdLine(bool colored) noexcept : colored_{colored} {}
~LogSinkCmdLine() noexcept final = default;
LogSinkCmdLine(LogSinkCmdLine const&) noexcept = delete;
LogSinkCmdLine(LogSinkCmdLine&&) noexcept = delete;
auto operator=(LogSinkCmdLine const&) noexcept -> LogSinkCmdLine& = delete;
auto operator=(LogSinkCmdLine&&) noexcept -> LogSinkCmdLine& = delete;
/// \brief Thread-safe emitting of log messages to stderr.
void Emit(Logger const* logger,
LogLevel level,
std::string const& msg) const noexcept final {
static std::mutex mutex{};
auto prefix = LogLevelToString(level);
if (logger != nullptr) {
// append logger name
prefix = fmt::format("{} ({})", prefix, logger->Name());
}
prefix = prefix + ":";
auto cont_prefix = std::string(prefix.size(), ' ');
prefix = FormatPrefix(level, prefix);
bool msg_on_continuation{false};
if (logger != nullptr and msg.find('\n') != std::string::npos) {
cont_prefix = " ";
msg_on_continuation = true;
}
{
std::lock_guard lock{mutex};
if (msg_on_continuation) {
fmt::print(stderr, "{}\n", prefix);
prefix = cont_prefix;
}
using it = std::istream_iterator<ILogSink::Line>;
std::istringstream iss{msg};
for_each(it{iss}, it{}, [&](auto const& line) {
fmt::print(stderr, "{} {}\n", prefix, line);
prefix = cont_prefix;
});
std::fflush(stderr);
}
}
private:
bool colored_{};
[[nodiscard]] auto FormatPrefix(LogLevel level,
std::string const& prefix) const noexcept
-> std::string {
fmt::text_style style{};
if (colored_) {
switch (level) {
case LogLevel::Error:
style = fg(fmt::color::red);
break;
case LogLevel::Warning:
style = fg(fmt::color::orange);
break;
case LogLevel::Info:
style = fg(fmt::color::lime_green);
break;
case LogLevel::Progress:
style = fg(fmt::color::dark_green);
break;
case LogLevel::Performance:
style = fg(fmt::color::light_sky_blue);
break;
case LogLevel::Debug:
style = fg(fmt::color::sky_blue);
break;
case LogLevel::Trace:
style = fg(fmt::color::deep_sky_blue);
break;
}
}
try {
return fmt::format(style, "{}", prefix);
} catch (...) {
return prefix;
}
}
};
#endif // INCLUDED_SRC_BUILDTOOL_LOGGING_LOG_SINK_CMDLINE_HPP
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