Program Listing for File rang.cc¶
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#ifndef DOXYGEN_SHOULD_SKIP_THIS
#include "Utils.hh"
#if defined(UTILS_OS_LINUX) || defined(UTILS_OS_OSX)
#include <unistd.h>
#elif defined(UTILS_OS_WINDOWS)
#include <windows.h>
#include <io.h>
#include <memory>
// Only defined in windows 10 onwards, redefining in lower windows since it
// doesn't gets used in lower versions
// https://docs.microsoft.com/en-us/windows/console/getconsolemode
#ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
#define ENABLE_VIRTUAL_TERMINAL_PROCESSING 0x0004
#endif
#endif
namespace rang {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
using std::string;
using std::wstring;
using std::getenv;
using std::any_of;
using std::begin;
using std::end;
using std::strstr;
using std::unique_ptr;
using std::nothrow;
using std::clog;
using std::cerr;
using std::cout;
using std::ostream;
using std::streambuf;
#endif
namespace rang_implementation {
bool
supportsColor() noexcept {
#if defined(UTILS_OS_LINUX) || defined(UTILS_OS_OSX)
static const bool result = [] {
char const * Terms[] = {
"ansi", "color", "console", "cygwin", "gnome",
"konsole", "kterm", "linux", "msys", "putty",
"rxvt", "screen", "vt100", "xterm"
};
char const *env_p = getenv("TERM");
if ( env_p == nullptr ) return false;
return any_of(
begin(Terms), end(Terms),
[&](const char *term) { return strstr(env_p, term) != nullptr; }
);
}();
#elif defined(UTILS_OS_WINDOWS)
// All windows versions support colors through native console methods
static constexpr bool result = true;
#else
static constexpr bool result = false;
#endif
return result;
}
#ifdef UTILS_OS_WINDOWS
bool
isMsysPty( int fd ) noexcept {
// disable for mingw on MATLAB
#if (defined(MINGW) || defined(__MINGW32__)) && defined(MATLAB_MEX_FILE )
return false;
#else
// Dynamic load for binary compability with old Windows
auto const ptrGetFileInformationByHandleEx = reinterpret_cast<decltype(&GetFileInformationByHandleEx)>(
GetProcAddress(
GetModuleHandle(TEXT("kernel32.dll")),
"GetFileInformationByHandleEx"
)
);
if ( !ptrGetFileInformationByHandleEx ) return false;
HANDLE h = reinterpret_cast<HANDLE>(_get_osfhandle(fd));
if ( h == INVALID_HANDLE_VALUE ) return false;
// Check that it's a pipe:
if ( GetFileType(h) != FILE_TYPE_PIPE ) return false;
// POD type is binary compatible with FILE_NAME_INFO from WinBase.h
// It have the same alignment and used to avoid UB in caller code
struct MY_FILE_NAME_INFO {
DWORD FileNameLength;
WCHAR FileName[MAX_PATH];
};
auto pNameInfo = unique_ptr<MY_FILE_NAME_INFO>(
new (nothrow) MY_FILE_NAME_INFO()
);
if (!pNameInfo) return false;
// Check pipe name is template of
// {"cygwin-","msys-"}XXXXXXXXXXXXXXX-ptyX-XX
if ( !ptrGetFileInformationByHandleEx( h, FileNameInfo, pNameInfo.get(), sizeof(MY_FILE_NAME_INFO)) ) return false;
wstring name(pNameInfo->FileName, pNameInfo->FileNameLength / sizeof(WCHAR));
if ( ( name.find(L"msys-") == wstring::npos && name.find(L"cygwin-") == wstring::npos )
|| name.find(L"-pty") == wstring::npos) return false;
return true;
#endif
}
#endif
bool
isTerminal( streambuf const * osbuf ) noexcept {
#if defined(UTILS_OS_LINUX) || defined(UTILS_OS_OSX)
if ( osbuf == cout.rdbuf() ) {
static const bool cout_term = isatty(fileno(stdout)) != 0;
return cout_term;
} else if ( osbuf == cerr.rdbuf() || osbuf == clog.rdbuf() ) {
static const bool cerr_term = isatty(fileno(stderr)) != 0;
return cerr_term;
}
#elif defined(UTILS_OS_WINDOWS)
if ( osbuf == cout.rdbuf()) {
static const bool cout_term = (_isatty(_fileno(stdout)) || isMsysPty(_fileno(stdout)));
return cout_term;
} else if (osbuf == cerr.rdbuf() || osbuf == clog.rdbuf()) {
static const bool cerr_term = (_isatty(_fileno(stderr)) || isMsysPty(_fileno(stderr)));
return cerr_term;
}
#endif
return false;
}
#ifdef UTILS_OS_WINDOWS
struct SGR { // Select Graphic Rendition parameters for Windows console
BYTE fgColor; // foreground color (0-15) lower 3 rgb bits + intense bit
BYTE bgColor; // background color (0-15) lower 3 rgb bits + intense bit
BYTE bold; // emulated as FOREGROUND_INTENSITY bit
BYTE underline; // emulated as BACKGROUND_INTENSITY bit
BOOLEAN inverse; // swap foreground/bold & background/underline
BOOLEAN conceal; // set foreground/bold to background/underline
};
enum class AttrColor : BYTE { // Color attributes for console screen buffer
black = 0,
red = 4,
green = 2,
yellow = 6,
blue = 1,
magenta = 5,
cyan = 3,
gray = 7
};
HANDLE
getConsoleHandle( streambuf const * osbuf ) noexcept {
if ( osbuf == cout.rdbuf() ) {
static const HANDLE hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
return hStdout;
} else if ( osbuf == cerr.rdbuf() || osbuf == clog.rdbuf() ) {
static const HANDLE hStderr = GetStdHandle(STD_ERROR_HANDLE);
return hStderr;
}
return INVALID_HANDLE_VALUE;
}
bool
setWinTermAnsiColors( streambuf const *osbuf ) noexcept {
HANDLE h = getConsoleHandle(osbuf);
if ( h == INVALID_HANDLE_VALUE ) return false;
DWORD dwMode = 0;
if ( !GetConsoleMode(h, &dwMode) ) return false;
dwMode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
if ( !SetConsoleMode(h, dwMode) ) return false;
return true;
}
bool
supportsAnsi( streambuf const * osbuf ) noexcept {
if ( osbuf == cout.rdbuf() ) {
static const bool cout_ansi = (isMsysPty(_fileno(stdout)) || setWinTermAnsiColors(osbuf));
return cout_ansi;
} else if ( osbuf == cerr.rdbuf() || osbuf == clog.rdbuf() ) {
static const bool cerr_ansi = (isMsysPty(_fileno(stderr)) || setWinTermAnsiColors(osbuf));
return cerr_ansi;
}
return false;
}
SGR const &
defaultState() noexcept {
static const SGR defaultSgr = []() -> SGR {
CONSOLE_SCREEN_BUFFER_INFO info;
WORD attrib = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;
if ( GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE),&info) ||
GetConsoleScreenBufferInfo(GetStdHandle(STD_ERROR_HANDLE),&info) ) {
attrib = info.wAttributes;
}
SGR sgr = { 0, 0, 0, 0, FALSE, FALSE };
sgr.fgColor = attrib & 0x0F;
sgr.bgColor = (attrib & 0xF0) >> 4;
return sgr;
}();
return defaultSgr;
}
BYTE
ansi2attr( BYTE rgb ) noexcept {
static const AttrColor rev[8] = {
AttrColor::black, AttrColor::red, AttrColor::green,
AttrColor::yellow, AttrColor::blue, AttrColor::magenta,
AttrColor::cyan, AttrColor::gray
};
return static_cast<BYTE>(rev[rgb]);
}
void
setWinSGR( rang::bg col, SGR & state ) noexcept {
if ( col != rang::bg::reset ) {
state.bgColor = ansi2attr(static_cast<BYTE>(col) - 40);
} else {
state.bgColor = defaultState().bgColor;
}
}
void
setWinSGR( rang::fg col, SGR & state ) noexcept {
if (col != rang::fg::reset) {
state.fgColor = ansi2attr(static_cast<BYTE>(col) - 30);
} else {
state.fgColor = defaultState().fgColor;
}
}
void
setWinSGR( rang::bgB col, SGR & state ) noexcept {
state.bgColor = (BACKGROUND_INTENSITY >> 4) | ansi2attr(static_cast<BYTE>(col) - 100);
}
void
setWinSGR( rang::fgB col, SGR & state ) noexcept {
state.fgColor = FOREGROUND_INTENSITY | ansi2attr(static_cast<BYTE>(col) - 90);
}
void
setWinSGR( rang::style style, SGR & state ) noexcept {
switch (style) {
case rang::style::reset:
state = defaultState();
break;
case rang::style::bold:
state.bold = FOREGROUND_INTENSITY;
break;
case rang::style::underline:
case rang::style::blink:
state.underline = BACKGROUND_INTENSITY;
break;
case rang::style::reversed:
state.inverse = TRUE;
break;
case rang::style::conceal:
state.conceal = TRUE;
break;
default:
break;
}
}
SGR &
current_state() noexcept {
static SGR state = defaultState();
return state;
}
WORD
SGR2Attr(const SGR &state) noexcept {
WORD attrib = 0;
if ( state.conceal ) {
if ( state.inverse ) {
attrib = (state.fgColor << 4) | state.fgColor;
if ( state.bold ) attrib |= FOREGROUND_INTENSITY | BACKGROUND_INTENSITY;
} else {
attrib = (state.bgColor << 4) | state.bgColor;
if ( state.underline ) attrib |= FOREGROUND_INTENSITY | BACKGROUND_INTENSITY;
}
} else if ( state.inverse ) {
attrib = (state.fgColor << 4) | state.bgColor;
if ( state.bold ) attrib |= BACKGROUND_INTENSITY;
if ( state.underline ) attrib |= FOREGROUND_INTENSITY;
} else {
attrib = state.fgColor | (state.bgColor << 4) | state.bold | state.underline;
}
return attrib;
}
template <typename T>
inline
void
setWinColorNative_tmpl( ostream &os, T const value ) {
HANDLE const h = getConsoleHandle(os.rdbuf());
if ( h != INVALID_HANDLE_VALUE ) {
setWinSGR(value, current_state());
// Out all buffered text to console with previous settings:
os.flush();
SetConsoleTextAttribute(h, SGR2Attr(current_state()));
}
}
#define DO_INSTANTIATION(A) \
void \
setWinColorNative( ostream &os, A value ) { \
setWinColorNative_tmpl<A>( os, value ); \
}
DO_INSTANTIATION( enum rang::style );
DO_INSTANTIATION( enum rang::bg );
DO_INSTANTIATION( enum rang::fg );
DO_INSTANTIATION( enum rang::bgB );
DO_INSTANTIATION( enum rang::fgB );
#endif
} // namespace rang_implementation
} // namespace rang
#endif
