| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| |
| #include "kudu/tools/color.h" |
| |
| #include <unistd.h> |
| |
| #include <ostream> |
| |
| #include <gflags/gflags.h> |
| #include <glog/logging.h> |
| |
| #include "kudu/gutil/macros.h" |
| #include "kudu/gutil/strings/substitute.h" |
| #include "kudu/util/flag_tags.h" |
| |
| DEFINE_string(color, "auto", |
| "Specifies whether output should be colorized. The default value " |
| "'auto' colorizes output if the output is a terminal. The other " |
| "valid values are 'always' or 'never'."); |
| TAG_FLAG(color, stable); |
| |
| static bool ValidateColorFlag(const char* flagname, const std::string& value) { |
| if (value == "always" || |
| value == "auto" || |
| value == "never") { |
| return true; |
| } |
| LOG(ERROR) << "option 'color' expects \"always\", \"auto\", or \"never\""; |
| return false; |
| } |
| DEFINE_validator(color, &ValidateColorFlag); |
| |
| |
| namespace kudu { |
| namespace tools { |
| |
| namespace { |
| bool UseColor() { |
| if (FLAGS_color == "never") return false; |
| if (FLAGS_color == "always") return true; |
| return isatty(STDOUT_FILENO); |
| } |
| |
| const char* StringForCode(AnsiCode color) { |
| if (!UseColor()) return ""; |
| |
| // Codes from: https://en.wikipedia.org/wiki/ANSI_escape_code |
| switch (color) { |
| case AnsiCode::RED: return "\x1b[31m"; |
| case AnsiCode::GREEN: return "\x1b[32m"; |
| case AnsiCode::YELLOW: return "\x1b[33m"; |
| case AnsiCode::BLUE: return "\x1b[34m"; |
| case AnsiCode::RESET: return "\x1b[m"; |
| } |
| LOG(FATAL); |
| return ""; |
| } |
| } // anonymous namespace |
| |
| std::string Color(AnsiCode color, StringPiece s) { |
| return strings::Substitute("$0$1$2", |
| StringForCode(color), |
| s, |
| StringForCode(AnsiCode::RESET)); |
| } |
| |
| } // namespace tools |
| } // namespace kudu |