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<?php
namespace splitbrain\phpcli;
/**
* Class Colors
*
* Handles color output on (Linux) terminals
*
* @author Andreas Gohr <andi@splitbrain.org>
* @license MIT
*/
class Colors
{
// these constants make IDE autocompletion easier, but color names can also be passed as strings
const C_RESET = 'reset';
const C_BLACK = 'black';
const C_DARKGRAY = 'darkgray';
const C_BLUE = 'blue';
const C_LIGHTBLUE = 'lightblue';
const C_GREEN = 'green';
const C_LIGHTGREEN = 'lightgreen';
const C_CYAN = 'cyan';
const C_LIGHTCYAN = 'lightcyan';
const C_RED = 'red';
const C_LIGHTRED = 'lightred';
const C_PURPLE = 'purple';
const C_LIGHTPURPLE = 'lightpurple';
const C_BROWN = 'brown';
const C_YELLOW = 'yellow';
const C_LIGHTGRAY = 'lightgray';
const C_WHITE = 'white';
/** @var array known color names */
protected $colors = array(
self::C_RESET => "\33[0m",
self::C_BLACK => "\33[0;30m",
self::C_DARKGRAY => "\33[1;30m",
self::C_BLUE => "\33[0;34m",
self::C_LIGHTBLUE => "\33[1;34m",
self::C_GREEN => "\33[0;32m",
self::C_LIGHTGREEN => "\33[1;32m",
self::C_CYAN => "\33[0;36m",
self::C_LIGHTCYAN => "\33[1;36m",
self::C_RED => "\33[0;31m",
self::C_LIGHTRED => "\33[1;31m",
self::C_PURPLE => "\33[0;35m",
self::C_LIGHTPURPLE => "\33[1;35m",
self::C_BROWN => "\33[0;33m",
self::C_YELLOW => "\33[1;33m",
self::C_LIGHTGRAY => "\33[0;37m",
self::C_WHITE => "\33[1;37m",
);
/** @var bool should colors be used? */
protected $enabled = true;
/**
* Constructor
*
* Tries to disable colors for non-terminals
*/
public function __construct()
{
if (function_exists('posix_isatty') && !posix_isatty(STDOUT)) {
$this->enabled = false;
return;
}
if (!getenv('TERM')) {
$this->enabled = false;
return;
}
}
/**
* enable color output
*/
public function enable()
{
$this->enabled = true;
}
/**
* disable color output
*/
public function disable()
{
$this->enabled = false;
}
/**
* @return bool is color support enabled?
*/
public function isEnabled()
{
return $this->enabled;
}
/**
* Convenience function to print a line in a given color
*
* @param string $line the line to print, a new line is added automatically
* @param string $color one of the available color names
* @param resource $channel file descriptor to write to
*
* @throws Exception
*/
public function ptln($line, $color, $channel = STDOUT)
{
$this->set($color);
fwrite($channel, rtrim($line) . "\n");
$this->reset();
}
/**
* Returns the given text wrapped in the appropriate color and reset code
*
* @param string $text string to wrap
* @param string $color one of the available color names
* @return string the wrapped string
* @throws Exception
*/
public function wrap($text, $color)
{
return $this->getColorCode($color) . $text . $this->getColorCode('reset');
}
/**
* Gets the appropriate terminal code for the given color
*
* @param string $color one of the available color names
* @return string color code
* @throws Exception
*/
public function getColorCode($color)
{
if (!$this->enabled) {
return '';
}
if (!isset($this->colors[$color])) {
throw new Exception("No such color $color");
}
return $this->colors[$color];
}
/**
* Set the given color for consecutive output
*
* @param string $color one of the supported color names
* @param resource $channel file descriptor to write to
* @throws Exception
*/
public function set($color, $channel = STDOUT)
{
fwrite($channel, $this->getColorCode($color));
}
/**
* reset the terminal color
*
* @param resource $channel file descriptor to write to
*
* @throws Exception
*/
public function reset($channel = STDOUT)
{
$this->set('reset', $channel);
}
}
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