+
+ /**
+ * Returns true if the stream supports colorization.
+ *
+ * Reference: Composer\XdebugHandler\Process::supportsColor
+ * https://github.com/composer/xdebug-handler
+ *
+ * @param mixed $stream A CLI output stream
+ *
+ * @return bool
+ */
+ private function hasColorSupport($stream)
+ {
+ if (!is_resource($stream) || 'stream' !== get_resource_type($stream)) {
+ return false;
+ }
+
+ if (DIRECTORY_SEPARATOR === '\\') {
+ return (function_exists('sapi_windows_vt100_support')
+ && @sapi_windows_vt100_support($stream))
+ || false !== getenv('ANSICON')
+ || 'ON' === getenv('ConEmuANSI')
+ || 'xterm' === getenv('TERM');
+ }
+
+ if (function_exists('stream_isatty')) {
+ return @stream_isatty($stream);
+ }
+
+ if (function_exists('posix_isatty')) {
+ return @posix_isatty($stream);
+ }
+
+ $stat = @fstat($stream);
+ // Check if formatted mode is S_IFCHR
+ return $stat ? 0020000 === ($stat['mode'] & 0170000) : false;
+ }
+
+ /**
+ * Returns true if the Windows terminal supports true color.
+ *
+ * Note that this does not check an output stream, but relies on environment
+ * variables from known implementations, or a PHP and Windows version that
+ * supports true color.
+ *
+ * @return bool
+ */
+ private function isWindowsTrueColor()
+ {
+ $result = 183 <= getenv('ANSICON_VER')
+ || 'ON' === getenv('ConEmuANSI')
+ || 'xterm' === getenv('TERM');
+
+ if (!$result && PHP_VERSION_ID >= 70200) {
+ $version = sprintf(
+ '%s.%s.%s',
+ PHP_WINDOWS_VERSION_MAJOR,
+ PHP_WINDOWS_VERSION_MINOR,
+ PHP_WINDOWS_VERSION_BUILD
+ );
+ $result = $version >= '10.0.15063';
+ }
+
+ return $result;
+ }