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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* 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.
*/
#pragma once
#include <array>
#include <ostream>
#include <random>
#include <sstream>
namespace utils {
#define foreach_modifier \
_(RESET, 0) \
_(BOLD, 1) \
_(FG_DEFAULT, 39) \
_(FG_BLACK, 30) \
_(FG_RED, 31) \
_(FG_GREEN, 32) \
_(FG_YELLOW, 33) \
_(FG_BLUE, 34) \
_(FG_MAGENTA, 35) \
_(FG_CYAN, 36) \
_(FG_LIGHT_GRAY, 37) \
_(FG_DARK_GRAY, 90) \
_(FG_LIGHT_RED, 91) \
_(FG_LIGHT_GREEN, 92) \
_(FG_LIGHT_YELLOW, 93) \
_(FG_LIGHT_BLUE, 94) \
_(FG_LIGHT_MAGENTA, 95) \
_(FG_LIGHT_CYAN, 96) \
_(FG_WHITE, 97) \
_(BG_RED, 41) \
_(BG_GREEN, 42) \
_(BG_BLUE, 44) \
_(BG_DEFAULT, 49)
class ColorModifier {
static inline const std::size_t n_modifiers = 23;
static inline const char format_string_start[] = "\033[";
static inline const char format_string_end[] = "m";
public:
enum class Code {
#define _(name, value) name = value,
foreach_modifier
#undef _
};
static inline std::array<Code, n_modifiers> code_array = {
#define _(name, value) Code::name,
foreach_modifier
#undef _
};
static Code getRandomModifier() {
static std::random_device rd;
static std::mt19937 gen(rd());
static std::uniform_int_distribution<> distr(4, 17);
return code_array[distr(gen)];
}
ColorModifier(Code code) : code_(code), color_string_() {
std::stringstream ss;
if (std::getenv("COLORTERM") != nullptr) {
ss << format_string_start << static_cast<int>(code_) << format_string_end;
color_string_ = ss.str();
}
}
ColorModifier() : ColorModifier(getRandomModifier()) {}
friend std::ostream& operator<<(std::ostream& os, const ColorModifier& mod) {
return os << mod.color_string_;
}
private:
Code code_;
std::string color_string_;
};
} // namespace utils
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