ConsoleOutput.php

<?php
/**
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @since         2.0.0
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\Console;

/**
 * Object wrapper for outputting information from a shell application.
 * Can be connected to any stream resource that can be used with fopen()
 *
 * Can generate colorized output on consoles that support it. There are a few
 * built in styles
 *
 * - `error` Error messages.
 * - `warning` Warning messages.
 * - `info` Informational messages.
 * - `comment` Additional text.
 * - `question` Magenta text used for user prompts
 *
 * By defining styles with addStyle() you can create custom console styles.
 *
 * ### Using styles in output
 *
 * You can format console output using tags with the name of the style to apply. From inside a shell object
 *
 * ```
 * $this->out('<warning>Overwrite:</warning> foo.php was overwritten.');
 * ```
 *
 * This would create orange 'Overwrite:' text, while the rest of the text would remain the normal color.
 * See ConsoleOutput::styles() to learn more about defining your own styles. Nested styles are not supported
 * at this time.
 *
 */
class ConsoleOutput
{

    /**
     * Raw output constant - no modification of output text.
     *
     * @var int
     */
    const RAW = 0;

    /**
     * Plain output - tags will be stripped.
     *
     * @var int
     */
    const PLAIN = 1;

    /**
     * Color output - Convert known tags in to ANSI color escape codes.
     *
     * @var int
     */
    const COLOR = 2;

    /**
     * Constant for a newline.
     *
     * @var string
     */
    const LF = PHP_EOL;

    /**
     * File handle for output.
     *
     * @var resource
     */
    protected $_output;

    /**
     * The current output type. Manipulated with ConsoleOutput::outputAs();
     *
     * @var int
     */
    protected $_outputAs = self::COLOR;

    /**
     * text colors used in colored output.
     *
     * @var array
     */
    protected static $_foregroundColors = [
        'black' => 30,
        'red' => 91,
        'green' => 32,
        'yellow' => 33,
        'blue' => 34,
        'magenta' => 35,
        'cyan' => 36,
        'white' => 37
    ];

    /**
     * background colors used in colored output.
     *
     * @var array
     */
    protected static $_backgroundColors = [
        'black' => 40,
        'red' => 41,
        'green' => 42,
        'yellow' => 43,
        'blue' => 44,
        'magenta' => 45,
        'cyan' => 46,
        'white' => 47
    ];

    /**
     * formatting options for colored output
     *
     * @var string
     */
    protected static $_options = [
        'bold' => 1,
        'underline' => 4,
        'blink' => 5,
        'reverse' => 7,
    ];

    /**
     * Styles that are available as tags in console output.
     * You can modify these styles with ConsoleOutput::styles()
     *
     * @var array
     */
    protected static $_styles = [
        'emergency' => ['text' => 'red'],
        'alert' => ['text' => 'red'],
        'critical' => ['text' => 'red'],
        'error' => ['text' => 'red'],
        'warning' => ['text' => 'yellow'],
        'info' => ['text' => 'cyan'],
        'debug' => ['text' => 'yellow'],
        'success' => ['text' => 'green'],
        'comment' => ['text' => 'blue'],
        'question' => ['text' => 'magenta'],
        'notice' => ['text' => 'cyan']
    ];

    /**
     * Construct the output object.
     *
     * Checks for a pretty console environment. Ansicon and ConEmu allows
     *  pretty consoles on windows, and is supported.
     *
     * @param string $stream The identifier of the stream to write output to.
     */
    public function __construct($stream = 'php://stdout')
    {
        $this->_output = fopen($stream, 'w');

        if ((DS === '\\' && !(bool)env('ANSICON') && env('ConEmuANSI') !== 'ON') ||
            (function_exists('posix_isatty') && !posix_isatty($this->_output))
        ) {
            $this->_outputAs = self::PLAIN;
        }
    }

    /**
     * Outputs a single or multiple messages to stdout. If no parameters
     * are passed, outputs just a newline.
     *
     * @param string|array $message A string or an array of strings to output
     * @param int $newlines Number of newlines to append
     * @return int Returns the number of bytes returned from writing to stdout.
     */
    public function write($message, $newlines = 1)
    {
        if (is_array($message)) {
            $message = implode(static::LF, $message);
        }
        return $this->_write($this->styleText($message . str_repeat(static::LF, $newlines)));
    }

    /**
     * Apply styling to text.
     *
     * @param string $text Text with styling tags.
     * @return string String with color codes added.
     */
    public function styleText($text)
    {
        if ($this->_outputAs == static::RAW) {
            return $text;
        }
        if ($this->_outputAs == static::PLAIN) {
            $tags = implode('|', array_keys(static::$_styles));
            return preg_replace('#</?(?:' . $tags . ')>#', '', $text);
        }
        return preg_replace_callback(
            '/<(?P<tag>[a-z0-9-_]+)>(?P<text>.*?)<\/(\1)>/ims',
            [$this, '_replaceTags'],
            $text
        );
    }

    /**
     * Replace tags with color codes.
     *
     * @param array $matches An array of matches to replace.
     * @return string
     */
    protected function _replaceTags($matches)
    {
        $style = $this->styles($matches['tag']);
        if (empty($style)) {
            return '<' . $matches['tag'] . '>' . $matches['text'] . '</' . $matches['tag'] . '>';
        }

        $styleInfo = [];
        if (!empty($style['text']) && isset(static::$_foregroundColors[$style['text']])) {
            $styleInfo[] = static::$_foregroundColors[$style['text']];
        }
        if (!empty($style['background']) && isset(static::$_backgroundColors[$style['background']])) {
            $styleInfo[] = static::$_backgroundColors[$style['background']];
        }
        unset($style['text'], $style['background']);
        foreach ($style as $option => $value) {
            if ($value) {
                $styleInfo[] = static::$_options[$option];
            }
        }
        return "\033[" . implode($styleInfo, ';') . 'm' . $matches['text'] . "\033[0m";
    }

    /**
     * Writes a message to the output stream.
     *
     * @param string $message Message to write.
     * @return bool success
     */
    protected function _write($message)
    {
        return fwrite($this->_output, $message);
    }

    /**
     * Get the current styles offered, or append new ones in.
     *
     * ### Get a style definition
     *
     * ```
     * $output->styles('error');
     * ```
     *
     * ### Get all the style definitions
     *
     * ```
     * $output->styles();
     * ```
     *
     * ### Create or modify an existing style
     *
     * ```
     * $output->styles('annoy', ['text' => 'purple', 'background' => 'yellow', 'blink' => true]);
     * ```
     *
     * ### Remove a style
     *
     * ```
     * $this->output->styles('annoy', false);
     * ```
     *
     * @param string|null $style The style to get or create.
     * @param array|bool|null $definition The array definition of the style to change or create a style
     *   or false to remove a style.
     * @return mixed If you are getting styles, the style or null will be returned. If you are creating/modifying
     *   styles true will be returned.
     */
    public function styles($style = null, $definition = null)
    {
        if ($style === null && $definition === null) {
            return static::$_styles;
        }
        if (is_string($style) && $definition === null) {
            return isset(static::$_styles[$style]) ? static::$_styles[$style] : null;
        }
        if ($definition === false) {
            unset(static::$_styles[$style]);
            return true;
        }
        static::$_styles[$style] = $definition;
        return true;
    }

    /**
     * Get/Set the output type to use. The output type how formatting tags are treated.
     *
     * @param int|null $type The output type to use. Should be one of the class constants.
     * @return int|null  Either null or the value if getting.
     */
    public function outputAs($type = null)
    {
        if ($type === null) {
            return $this->_outputAs;
        }
        $this->_outputAs = $type;
    }

    /**
     * Clean up and close handles
     */
    public function __destruct()
    {
        if (is_resource($this->_output)) {
            fclose($this->_output);
        }
    }
}