message`,
* `message`)
* - Write output to a specified stream, optionally with colorization.
* - Write a line of output to a specified stream, optionally with
* colorization, using the system EOL sequence..
* - Write an error message to STDERR.
*
* Colorization will only occur when expected sequences are discovered, and
* then, only if the console terminal allows it.
*
* Essentially, provides the bare minimum to allow you to provide messages to
* the current console.
*/
class ConsoleHelper
{
const COLOR_GREEN = "\033[32m";
const COLOR_RED = "\033[31m";
const COLOR_RESET = "\033[0m";
const HIGHLIGHT_INFO = 'info';
const HIGHLIGHT_ERROR = 'error';
private $highlightMap = [
self::HIGHLIGHT_INFO => self::COLOR_GREEN,
self::HIGHLIGHT_ERROR => self::COLOR_RED,
];
/**
* @var string Exists only for testing.
*/
private $eol = PHP_EOL;
/**
* @var resource Exists only for testing.
*/
private $stderr = STDERR;
/**
* @var bool
*/
private $supportsColor;
/**
* @param resource $resource
*/
public function __construct($resource = STDOUT)
{
$this->supportsColor = $this->detectColorCapabilities($resource);
}
/**
* Colorize a string for use with the terminal.
*
* Takes strings formatted as `string` and formats them per the
* $highlightMap; if color support is disabled, simply removes the formatting
* tags.
*
* @param string $string
* @return string
*/
public function colorize($string)
{
$reset = $this->supportsColor ? self::COLOR_RESET : '';
foreach ($this->highlightMap as $key => $color) {
$pattern = sprintf('#<%s>(.*?)#s', $key, $key);
$color = $this->supportsColor ? $color : '';
$string = preg_replace($pattern, $color . '$1' . $reset, $string);
}
return $string;
}
/**
* @param string $string
* @param bool $colorize Whether or not to colorize the string
* @param resource $resource Defaults to STDOUT
* @return void
*/
public function write($string, $colorize = true, $resource = STDOUT)
{
if ($colorize) {
$string = $this->colorize($string);
}
$string = $this->formatNewlines($string);
fwrite($resource, $string);
}
/**
* @param string $string
* @param bool $colorize Whether or not to colorize the line
* @param resource $resource Defaults to STDOUT
* @return void
*/
public function writeLine($string, $colorize = true, $resource = STDOUT)
{
$this->write($string . $this->eol, $colorize, $resource);
}
/**
* Emit an error message.
*
* Wraps the message in ``, and passes it to `writeLine()`,
* using STDERR as the resource; emits an additional empty line when done,
* also to STDERR.
*
* @param string $message
* @return void
*/
public function writeErrorMessage($message)
{
$this->writeLine(sprintf('%s', $message), true, $this->stderr);
$this->writeLine('', false, $this->stderr);
}
/**
* @param resource $resource
* @return bool
*/
private function detectColorCapabilities($resource = STDOUT)
{
if ('\\' === DIRECTORY_SEPARATOR) {
// Windows
return false !== getenv('ANSICON')
|| 'ON' === getenv('ConEmuANSI')
|| 'xterm' === getenv('TERM');
}
return function_exists('posix_isatty') && posix_isatty($resource);
}
/**
* Ensure newlines are appropriate for the current terminal.
*
* @param string
* @return string
*/
private function formatNewlines($string)
{
$string = str_replace($this->eol, "\0PHP_EOL\0", $string);
$string = preg_replace("/(\r\n|\n|\r)/", $this->eol, $string);
return str_replace("\0PHP_EOL\0", $this->eol, $string);
}
}