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/*******************************************************************************
*
* File: terminal_colors.cpp
*
* Contents: Facility for printing colorized text to terminals supporting it.
*
* Copyright 2017
*
* Author: David Juhasz (david.juhasz@tuwien.ac.at)
*
******************************************************************************/
#include "rosa/support/terminal_colors.h"
#include "rosa/support/debug.hpp"
#include "rosa/config/config.h"
#include <array>
#ifdef ROSA_POSIX
#include <unistd.h>
#endif // defined(ROSA_POSIX)
namespace rosa {
namespace terminal {
// ANSI color codes for POSIX terminals.
// NOTE: Use std::array for runtime efficiency, though static casting is
// necessary for indexing.
// NOTE: Do not index with Color::NumColors!
constexpr std::array<const char *, static_cast<size_t>(Color::NumColors)>
ANSIColorCodes{{
"0", // Default - Attribute reset
"30", // Black
"31", // Red
"32", // Green
"33", // Yelow
"34", // Blue
"35", // Magenta
"36", // Cyan
"37", // Lightgrey
"90", // Darkgrey
"91", // Lightred
"92", // Lightgreen
"93", // Lightyellow
"94", // Lightblue
"95", // Lightmagenta
"96", // Lightcyan
"97" // White
}};
std::ostream &operator<<(std::ostream &os, const Color color) {
ASSERT(color != Color::NumColors);
// Handle color only when printing to terminal and it supports colors.
#ifdef ROSA_POSIX
// Identify terminal by checking if the stream is buffered as one of the
// standard outputs, and the corresponding C standard output stream is
// pointing to a terminal.
// NOTE: This implementation may be tricked so that it does not print color
// to terminal, but should never print color codes to a non-terminal output.
if ((os.rdbuf() == std::cout.rdbuf() && isatty(fileno(stdin))) ||
((os.rdbuf() == std::cerr.rdbuf() || os.rdbuf() == std::clog.rdbuf()) &&
isatty(fileno(stderr)))) {
os << "\033[" << ANSIColorCodes[static_cast<size_t>(color)] << "m";
}
#elif defined(ROSA_WINDOWS)
// FIXME: Windows terminals support ANSI color codes from Windows 10
// Threshold 2, custom stuff is required for earlier versions.
#endif // defined(ROSA_POSIX) || defined(ROSA_WINDOWS)
return os;
}
} // End namespace terminal
} // End namespace rosa

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