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// Copyright 2020 The Tint 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
//
// 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 <unistd.h>
#include <cstring>
#include "src/diagnostic/printer.h"
namespace tint {
namespace diag {
namespace {
bool supports_colors(FILE* f) {
if (!isatty(fileno(f))) {
return false;
}
const char* cterm = getenv("TERM");
if (cterm == nullptr) {
return false;
}
std::string term = getenv("TERM");
if (term != "cygwin" && term != "linux" && term != "rxvt-unicode-256color" &&
term != "rxvt-unicode" && term != "screen-256color" && term != "screen" &&
term != "tmux-256color" && term != "tmux" && term != "xterm-256color" &&
term != "xterm-color" && term != "xterm") {
return false;
}
return true;
}
class PrinterLinux : public Printer {
public:
PrinterLinux(FILE* f, bool colors)
: file(f), use_colors(colors && supports_colors(f)) {}
void write(const std::string& str, const Style& style) override {
write_color(style.color, style.bold);
fwrite(str.data(), 1, str.size(), file);
write_color(Color::kDefault, false);
}
private:
constexpr const char* color_code(Color color, bool bold) {
switch (color) {
case Color::kDefault:
return bold ? "\u001b[1m" : "\u001b[0m";
case Color::kBlack:
return bold ? "\u001b[30;1m" : "\u001b[30m";
case Color::kRed:
return bold ? "\u001b[31;1m" : "\u001b[31m";
case Color::kGreen:
return bold ? "\u001b[32;1m" : "\u001b[32m";
case Color::kYellow:
return bold ? "\u001b[33;1m" : "\u001b[33m";
case Color::kBlue:
return bold ? "\u001b[34;1m" : "\u001b[34m";
case Color::kMagenta:
return bold ? "\u001b[35;1m" : "\u001b[35m";
case Color::kCyan:
return bold ? "\u001b[36;1m" : "\u001b[36m";
case Color::kWhite:
return bold ? "\u001b[37;1m" : "\u001b[37m";
}
return ""; // unreachable
}
void write_color(Color color, bool bold) {
if (use_colors) {
auto* code = color_code(color, bold);
fwrite(code, 1, strlen(code), file);
}
}
FILE* const file;
bool const use_colors;
};
} // namespace
std::unique_ptr<Printer> Printer::create(FILE* out, bool use_colors) {
return std::make_unique<PrinterLinux>(out, use_colors);
}
} // namespace diag
} // namespace tint