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<?php

/*
 * This file is part of Psy Shell.
 *
 * (c) 2012-2020 Justin Hileman
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Psy;

use
Psy\Exception\DeprecatedException;
use
Psy\Exception\RuntimeException;
use
Psy\ExecutionLoop\ProcessForker;
use
Psy\Output\OutputPager;
use
Psy\Output\ShellOutput;
use
Psy\TabCompletion\AutoCompleter;
use
Psy\VarDumper\Presenter;
use
Psy\VersionUpdater\Checker;
use
Psy\VersionUpdater\GitHubChecker;
use
Psy\VersionUpdater\IntervalChecker;
use
Psy\VersionUpdater\NoopChecker;
use
Symfony\Component\Console\Formatter\OutputFormatterStyle;
use
Symfony\Component\Console\Input\InputInterface;
use
Symfony\Component\Console\Input\InputOption;
use
Symfony\Component\Console\Output\OutputInterface;

/**
 * The Psy Shell configuration.
 */
class Configuration
{
    const
COLOR_MODE_AUTO     = 'auto';
    const
COLOR_MODE_FORCED   = 'forced';
    const
COLOR_MODE_DISABLED = 'disabled';

    const
INTERACTIVE_MODE_AUTO     = 'auto';
    const
INTERACTIVE_MODE_FORCED   = 'forced';
    const
INTERACTIVE_MODE_DISABLED = 'disabled';

    const
VERBOSITY_QUIET        = 'quiet';
    const
VERBOSITY_NORMAL       = 'normal';
    const
VERBOSITY_VERBOSE      = 'verbose';
    const
VERBOSITY_VERY_VERBOSE = 'very_verbose';
    const
VERBOSITY_DEBUG        = 'debug';

    private static
$AVAILABLE_OPTIONS = [
       
'codeCleaner',
       
'colorMode',
       
'configDir',
       
'dataDir',
       
'defaultIncludes',
       
'eraseDuplicates',
       
'errorLoggingLevel',
       
'forceArrayIndexes',
       
'formatterStyles',
       
'historySize',
       
'interactiveMode',
       
'manualDbFile',
       
'pager',
       
'prompt',
       
'rawOutput',
       
'requireSemicolons',
       
'runtimeDir',
       
'startupMessage',
       
'updateCheck',
       
'useBracketedPaste',
       
'usePcntl',
       
'useReadline',
       
'useTabCompletion',
       
'useUnicode',
       
'verbosity',
       
'warnOnMultipleConfigs',
    ];

    private
$defaultIncludes;
    private
$configDir;
    private
$dataDir;
    private
$runtimeDir;
    private
$configFile;
   
/** @var string|false */
   
private $historyFile;
    private
$historySize;
    private
$eraseDuplicates;
    private
$manualDbFile;
    private
$hasReadline;
    private
$useReadline;
    private
$useBracketedPaste;
    private
$hasPcntl;
    private
$usePcntl;
    private
$newCommands = [];
    private
$pipedInput;
    private
$pipedOutput;
    private
$rawOutput = false;
    private
$requireSemicolons = false;
    private
$useUnicode;
    private
$useTabCompletion;
    private
$newMatchers = [];
    private
$errorLoggingLevel = E_ALL;
    private
$warnOnMultipleConfigs = false;
    private
$colorMode = self::COLOR_MODE_AUTO;
    private
$interactiveMode = self::INTERACTIVE_MODE_AUTO;
    private
$updateCheck;
    private
$startupMessage;
    private
$forceArrayIndexes = false;
    private
$formatterStyles = [];
    private
$verbosity = self::VERBOSITY_NORMAL;

   
// services
   
private $readline;
    private
$output;
    private
$shell;
    private
$cleaner;
    private
$pager;
    private
$manualDb;
    private
$presenter;
    private
$autoCompleter;
    private
$checker;
    private
$prompt;

   
/**
     * Construct a Configuration instance.
     *
     * Optionally, supply an array of configuration values to load.
     *
     * @param array $config Optional array of configuration values
     */
   
public function __construct(array $config = [])
    {
       
// explicit configFile option
       
if (isset($config['configFile'])) {
           
$this->configFile = $config['configFile'];
        } elseif (isset(
$_SERVER['PSYSH_CONFIG']) && $_SERVER['PSYSH_CONFIG']) {
           
$this->configFile = $_SERVER['PSYSH_CONFIG'];
        }

       
// legacy baseDir option
       
if (isset($config['baseDir'])) {
           
$msg = "The 'baseDir' configuration option is deprecated; " .
               
"please specify 'configDir' and 'dataDir' options instead";
            throw new
DeprecatedException($msg);
        }

        unset(
$config['configFile'], $config['baseDir']);

       
// go go gadget, config!
       
$this->loadConfig($config);
       
$this->init();
    }

   
/**
     * Construct a Configuration object from Symfony Console input.
     *
     * This is great for adding psysh-compatible command line options to framework- or app-specific
     * wrappers.
     *
     * $input should already be bound to an appropriate InputDefinition (see self::getInputOptions
     * if you want to build your own) before calling this method. It's not required, but things work
     * a lot better if we do.
     *
     * @see self::getInputOptions
     *
     * @throws \InvalidArgumentException
     *
     * @param InputInterface $input
     *
     * @return self
     */
   
public static function fromInput(InputInterface $input)
    {
       
$config = new self(['configFile' => self::getConfigFileFromInput($input)]);

       
// Handle --color and --no-color (and --ansi and --no-ansi aliases)
       
if (self::getOptionFromInput($input, ['color', 'ansi'])) {
           
$config->setColorMode(self::COLOR_MODE_FORCED);
        } elseif (
self::getOptionFromInput($input, ['no-color', 'no-ansi'])) {
           
$config->setColorMode(self::COLOR_MODE_DISABLED);
        }

       
// Handle verbosity options
       
if ($verbosity = self::getVerbosityFromInput($input)) {
           
$config->setVerbosity($verbosity);
        }

       
// Handle interactive mode
       
if (self::getOptionFromInput($input, ['interactive', 'interaction'], ['-a', '-i'])) {
           
$config->setInteractiveMode(self::INTERACTIVE_MODE_FORCED);
        } elseif (
self::getOptionFromInput($input, ['no-interactive', 'no-interaction'], ['-n'])) {
           
$config->setInteractiveMode(self::INTERACTIVE_MODE_DISABLED);
        }

       
// Handle --raw-output
        // @todo support raw output with interactive input?
       
if (!$config->getInputInteractive()) {
            if (
self::getOptionFromInput($input, ['raw-output'], ['-r'])) {
               
$config->setRawOutput(true);
            }
        }

        return
$config;
    }

   
/**
     * Get the desired config file from the given input.
     *
     * @return string|null config file path, or null if none is specified
     */
   
private static function getConfigFileFromInput(InputInterface $input)
    {
       
// Best case, input is properly bound and validated.
       
if ($input->hasOption('config')) {
            return
$input->getOption('config');
        }

        return
$input->getParameterOption('--config', null, true) ?: $input->getParameterOption('-c', null, true);
    }

   
/**
     * Get a boolean option from the given input.
     *
     * This helper allows fallback for unbound and unvalidated input. It's not perfect--for example,
     * it can't deal with several short options squished together--but it's better than falling over
     * any time someone gives us unbound input.
     *
     * @return bool true if the option (or an alias) is present
     */
   
private static function getOptionFromInput(InputInterface $input, array $names, array $otherParams = [])
    {
       
// Best case, input is properly bound and validated.
       
foreach ($names as $name) {
            if (
$input->hasOption($name) && $input->getOption($name)) {
                return
true;
            }
        }

        foreach (
$names as $name) {
           
$otherParams[] = '--' . $name;
        }

        foreach (
$otherParams as $name) {
            if (
$input->hasParameterOption($name, true)) {
                return
true;
            }
        }

        return
false;
    }

   
/**
     * Get the desired verbosity from the given input.
     *
     * This is a bit more complext than the other options parsers. It handles `--quiet` and
     * `--verbose`, along with their short aliases, and fancy things like `-vvv`.
     *
     * @return string|null configuration constant, or null if no verbosity option is specified
     */
   
private static function getVerbosityFromInput(InputInterface $input)
    {
       
// --quiet wins!
       
if (self::getOptionFromInput($input, ['quiet'], ['-q'])) {
            return
self::VERBOSITY_QUIET;
        }

       
// Best case, input is properly bound and validated.
        //
        // Note that if the `--verbose` option is incorrectly defined as `VALUE_NONE` rather than
        // `VALUE_OPTIONAL` (as it is in Symfony Console by default) it doesn't actually work with
        // multiple verbosity levels as it claims.
        //
        // We can detect this by checking whether the the value === true, and fall back to unbound
        // parsing for this option.
       
if ($input->hasOption('verbose') && $input->getOption('verbose') !== true) {
            switch (
$input->getOption('verbose')) {
                case
'-1':
                    return
self::VERBOSITY_QUIET;
                case
'0': // explicitly normal, overrides config file default
                   
return self::VERBOSITY_NORMAL;
                case
'1':
                case
null: // `--verbose` and `-v`
                   
return self::VERBOSITY_VERBOSE;
                case
'2':
                case
'v': // `-vv`
                   
return self::VERBOSITY_VERY_VERBOSE;
                case
'3':
                case
'vv': // `-vvv`
                   
return self::VERBOSITY_DEBUG;
                default:
// implicitly normal, config file default wins
                   
return;
            }
        }

       
// quiet and normal have to come before verbose, because it eats everything else.
       
if ($input->hasParameterOption('--verbose=-1', true) || $input->getParameterOption('--verbose', false, true) === '-1') {
            return
self::VERBOSITY_QUIET;
        }

        if (
$input->hasParameterOption('--verbose=0', true) || $input->getParameterOption('--verbose', false, true) === '0') {
            return
self::VERBOSITY_NORMAL;
        }

       
// `-vvv`, `-vv` and `-v` have to come in descending length order, because `hasParameterOption` matches prefixes.
       
if ($input->hasParameterOption('-vvv', true) || $input->hasParameterOption('--verbose=3', true) || $input->getParameterOption('--verbose', false, true) === '3') {
            return
self::VERBOSITY_DEBUG;
        }

        if (
$input->hasParameterOption('-vv', true) || $input->hasParameterOption('--verbose=2', true) || $input->getParameterOption('--verbose', false, true) === '2') {
            return
self::VERBOSITY_VERY_VERBOSE;
        }

        if (
$input->hasParameterOption('-v', true) || $input->hasParameterOption('--verbose=1', true) || $input->hasParameterOption('--verbose', true)) {
            return
self::VERBOSITY_VERBOSE;
        }
    }

   
/**
     * Get a list of input options expected when initializing Configuration via input.
     *
     * @see self::fromInput
     *
     * @return InputOption[]
     */
   
public static function getInputOptions()
    {
        return [
            new
InputOption('config',         'c',        InputOption::VALUE_REQUIRED, 'Use an alternate PsySH config file location.'),
            new
InputOption('cwd',            null,       InputOption::VALUE_REQUIRED, 'Use an alternate working directory.'),

            new
InputOption('color',          null,       InputOption::VALUE_NONE,     'Force colors in output.'),
            new
InputOption('no-color',       null,       InputOption::VALUE_NONE,     'Disable colors in output.'),
           
// --ansi and --no-ansi aliases to match Symfony, Composer, etc.
           
new InputOption('ansi',           null,       InputOption::VALUE_NONE,     'Force colors in output.'),
            new
InputOption('no-ansi',        null,       InputOption::VALUE_NONE,     'Disable colors in output.'),

            new
InputOption('quiet',          'q',        InputOption::VALUE_NONE,     'Shhhhhh.'),
            new
InputOption('verbose',        'v|vv|vvv', InputOption::VALUE_OPTIONAL, 'Increase the verbosity of messages.', '0'),
            new
InputOption('interactive',    'i|a',      InputOption::VALUE_NONE,     'Force PsySH to run in interactive mode.'),
            new
InputOption('no-interactive', 'n',        InputOption::VALUE_NONE,     'Run PsySH without interactive input. Requires input from stdin.'),
           
// --interaction and --no-interaction aliases for compatibility with Symfony, Composer, etc
           
new InputOption('interaction',    null,       InputOption::VALUE_NONE,     'Force PsySH to run in interactive mode.'),
            new
InputOption('no-interaction', null,       InputOption::VALUE_NONE,     'Run PsySH without interactive input. Requires input from stdin.'),
            new
InputOption('raw-output',     'r',        InputOption::VALUE_NONE,     'Print var_export-style return values (for non-interactive input)'),
        ];
    }

   
/**
     * Initialize the configuration.
     *
     * This checks for the presence of Readline and Pcntl extensions.
     *
     * If a config file is available, it will be loaded and merged with the current config.
     *
     * If no custom config file was specified and a local project config file
     * is available, it will be loaded and merged with the current config.
     */
   
public function init()
    {
       
// feature detection
       
$this->hasReadline = \function_exists('readline');
       
$this->hasPcntl    = ProcessForker::isSupported();

        if (
$configFile = $this->getConfigFile()) {
           
$this->loadConfigFile($configFile);
        }

        if (!
$this->configFile && $localConfig = $this->getLocalConfigFile()) {
           
$this->loadConfigFile($localConfig);
        }
    }

   
/**
     * Get the current PsySH config file.
     *
     * If a `configFile` option was passed to the Configuration constructor,
     * this file will be returned. If not, all possible config directories will
     * be searched, and the first `config.php` or `rc.php` file which exists
     * will be returned.
     *
     * If you're trying to decide where to put your config file, pick
     *
     *     ~/.config/psysh/config.php
     *
     * @return string
     */
   
public function getConfigFile()
    {
        if (isset(
$this->configFile)) {
            return
$this->configFile;
        }

       
$files = ConfigPaths::getConfigFiles(['config.php', 'rc.php'], $this->configDir);

        if (!empty(
$files)) {
            if (
$this->warnOnMultipleConfigs && \count($files) > 1) {
               
$msg = \sprintf('Multiple configuration files found: %s. Using %s', \implode(', ', $files), $files[0]);
                \
trigger_error($msg, E_USER_NOTICE);
            }

            return
$files[0];
        }
    }

   
/**
     * Get the local PsySH config file.
     *
     * Searches for a project specific config file `.psysh.php` in the current
     * working directory.
     *
     * @return string
     */
   
public function getLocalConfigFile()
    {
       
$localConfig = \getcwd() . '/.psysh.php';

        if (@\
is_file($localConfig)) {
            return
$localConfig;
        }
    }

   
/**
     * Load configuration values from an array of options.
     *
     * @param array $options
     */
   
public function loadConfig(array $options)
    {
        foreach (
self::$AVAILABLE_OPTIONS as $option) {
            if (isset(
$options[$option])) {
               
$method = 'set' . \ucfirst($option);
               
$this->$method($options[$option]);
            }
        }

       
// legacy `tabCompletion` option
       
if (isset($options['tabCompletion'])) {
           
$msg = '`tabCompletion` is deprecated; use `useTabCompletion` instead.';
            @\
trigger_error($msg, E_USER_DEPRECATED);

           
$this->setUseTabCompletion($options['tabCompletion']);
        }

        foreach ([
'commands', 'matchers', 'casters'] as $option) {
            if (isset(
$options[$option])) {
               
$method = 'add' . \ucfirst($option);
               
$this->$method($options[$option]);
            }
        }

       
// legacy `tabCompletionMatchers` option
       
if (isset($options['tabCompletionMatchers'])) {
           
$msg = '`tabCompletionMatchers` is deprecated; use `matchers` instead.';
            @\
trigger_error($msg, E_USER_DEPRECATED);

           
$this->addMatchers($options['tabCompletionMatchers']);
        }
    }

   
/**
     * Load a configuration file (default: `$HOME/.config/psysh/config.php`).
     *
     * This configuration instance will be available to the config file as $config.
     * The config file may directly manipulate the configuration, or may return
     * an array of options which will be merged with the current configuration.
     *
     * @throws \InvalidArgumentException if the config file does not exist or returns a non-array result
     *
     * @param string $file
     */
   
public function loadConfigFile($file)
    {
        if (!\
is_file($file)) {
            throw new \
InvalidArgumentException(\sprintf('Invalid configuration file specified, %s does not exist', $file));
        }

       
$__psysh_config_file__ = $file;
       
$load = function ($config) use ($__psysh_config_file__) {
           
$result = require $__psysh_config_file__;
            if (
$result !== 1) {
                return
$result;
            }
        };
       
$result = $load($this);

        if (!empty(
$result)) {
            if (\
is_array($result)) {
               
$this->loadConfig($result);
            } else {
                throw new \
InvalidArgumentException('Psy Shell configuration must return an array of options');
            }
        }
    }

   
/**
     * Set files to be included by default at the start of each shell session.
     *
     * @param array $includes
     */
   
public function setDefaultIncludes(array $includes = [])
    {
       
$this->defaultIncludes = $includes;
    }

   
/**
     * Get files to be included by default at the start of each shell session.
     *
     * @return array
     */
   
public function getDefaultIncludes()
    {
        return
$this->defaultIncludes ?: [];
    }

   
/**
     * Set the shell's config directory location.
     *
     * @param string $dir
     */
   
public function setConfigDir($dir)
    {
       
$this->configDir = (string) $dir;
    }

   
/**
     * Get the current configuration directory, if any is explicitly set.
     *
     * @return string
     */
   
public function getConfigDir()
    {
        return
$this->configDir;
    }

   
/**
     * Set the shell's data directory location.
     *
     * @param string $dir
     */
   
public function setDataDir($dir)
    {
       
$this->dataDir = (string) $dir;
    }

   
/**
     * Get the current data directory, if any is explicitly set.
     *
     * @return string
     */
   
public function getDataDir()
    {
        return
$this->dataDir;
    }

   
/**
     * Set the shell's temporary directory location.
     *
     * @param string $dir
     */
   
public function setRuntimeDir($dir)
    {
       
$this->runtimeDir = (string) $dir;
    }

   
/**
     * Get the shell's temporary directory location.
     *
     * Defaults to  `/psysh` inside the system's temp dir unless explicitly
     * overridden.
     *
     * @return string
     */
   
public function getRuntimeDir()
    {
        if (!isset(
$this->runtimeDir)) {
           
$this->runtimeDir = ConfigPaths::getRuntimeDir();
        }

        if (!\
is_dir($this->runtimeDir)) {
            if (!@\
mkdir($this->runtimeDir, 0700, true)) {
                throw new
RuntimeException(sprintf('Unable to create PsySH runtime directory. Make sure PHP is able to write to %s in order to continue.', dirname($this->runtimeDir)));
            }
        }

        return
$this->runtimeDir;
    }

   
/**
     * Set the readline history file path.
     *
     * @param string $file
     */
   
public function setHistoryFile($file)
    {
       
$this->historyFile = ConfigPaths::touchFileWithMkdir($file);
    }

   
/**
     * Get the readline history file path.
     *
     * Defaults to `/history` inside the shell's base config dir unless
     * explicitly overridden.
     *
     * @return string
     */
   
public function getHistoryFile()
    {
        if (isset(
$this->historyFile)) {
            return
$this->historyFile;
        }

       
$files = ConfigPaths::getConfigFiles(['psysh_history', 'history'], $this->configDir);

        if (!empty(
$files)) {
            if (
$this->warnOnMultipleConfigs && \count($files) > 1) {
               
$msg = \sprintf('Multiple history files found: %s. Using %s', \implode(', ', $files), $files[0]);
                \
trigger_error($msg, E_USER_NOTICE);
            }

           
$this->setHistoryFile($files[0]);
        } else {
           
// fallback: create our own history file
           
$dir = $this->configDir ?: ConfigPaths::getCurrentConfigDir();
           
$this->setHistoryFile($dir . '/psysh_history');
        }

        return
$this->historyFile;
    }

   
/**
     * Set the readline max history size.
     *
     * @param int $value
     */
   
public function setHistorySize($value)
    {
       
$this->historySize = (int) $value;
    }

   
/**
     * Get the readline max history size.
     *
     * @return int
     */
   
public function getHistorySize()
    {
        return
$this->historySize;
    }

   
/**
     * Sets whether readline erases old duplicate history entries.
     *
     * @param bool $value
     */
   
public function setEraseDuplicates($value)
    {
       
$this->eraseDuplicates = (bool) $value;
    }

   
/**
     * Get whether readline erases old duplicate history entries.
     *
     * @return bool
     */
   
public function getEraseDuplicates()
    {
        return
$this->eraseDuplicates;
    }

   
/**
     * Get a temporary file of type $type for process $pid.
     *
     * The file will be created inside the current temporary directory.
     *
     * @see self::getRuntimeDir
     *
     * @param string $type
     * @param int    $pid
     *
     * @return string Temporary file name
     */
   
public function getTempFile($type, $pid)
    {
        return \
tempnam($this->getRuntimeDir(), $type . '_' . $pid . '_');
    }

   
/**
     * Get a filename suitable for a FIFO pipe of $type for process $pid.
     *
     * The pipe will be created inside the current temporary directory.
     *
     * @param string $type
     * @param int    $pid
     *
     * @return string Pipe name
     */
   
public function getPipe($type, $pid)
    {
        return \
sprintf('%s/%s_%s', $this->getRuntimeDir(), $type, $pid);
    }

   
/**
     * Check whether this PHP instance has Readline available.
     *
     * @return bool True if Readline is available
     */
   
public function hasReadline()
    {
        return
$this->hasReadline;
    }

   
/**
     * Enable or disable Readline usage.
     *
     * @param bool $useReadline
     */
   
public function setUseReadline($useReadline)
    {
       
$this->useReadline = (bool) $useReadline;
    }

   
/**
     * Check whether to use Readline.
     *
     * If `setUseReadline` as been set to true, but Readline is not actually
     * available, this will return false.
     *
     * @return bool True if the current Shell should use Readline
     */
   
public function useReadline()
    {
        return isset(
$this->useReadline) ? ($this->hasReadline && $this->useReadline) : $this->hasReadline;
    }

   
/**
     * Set the Psy Shell readline service.
     *
     * @param Readline\Readline $readline
     */
   
public function setReadline(Readline\Readline $readline)
    {
       
$this->readline = $readline;
    }

   
/**
     * Get the Psy Shell readline service.
     *
     * By default, this service uses (in order of preference):
     *
     *  * GNU Readline
     *  * Libedit
     *  * A transient array-based readline emulation.
     *
     * @return Readline\Readline
     */
   
public function getReadline()
    {
        if (!isset(
$this->readline)) {
           
$className = $this->getReadlineClass();
           
$this->readline = new $className(
               
$this->getHistoryFile(),
               
$this->getHistorySize(),
               
$this->getEraseDuplicates()
            );
        }

        return
$this->readline;
    }

   
/**
     * Get the appropriate Readline implementation class name.
     *
     * @see self::getReadline
     *
     * @return string
     */
   
private function getReadlineClass()
    {
        if (
$this->useReadline()) {
            if (
Readline\GNUReadline::isSupported()) {
                return
Readline\GNUReadline::class;
            } elseif (
Readline\Libedit::isSupported()) {
                return
Readline\Libedit::class;
            } elseif (
Readline\HoaConsole::isSupported()) {
                return
Readline\HoaConsole::class;
            }
        }

        return
Readline\Transient::class;
    }

   
/**
     * Enable or disable bracketed paste.
     *
     * Note that this only works with readline (not libedit) integration for now.
     *
     * @param bool $useBracketedPaste
     */
   
public function setUseBracketedPaste($useBracketedPaste)
    {
       
$this->useBracketedPaste = (bool) $useBracketedPaste;
    }

   
/**
     * Check whether to use bracketed paste with readline.
     *
     * When this works, it's magical. Tabs in pastes don't try to autcomplete.
     * Newlines in paste don't execute code until you get to the end. It makes
     * readline act like you'd expect when pasting.
     *
     * But it often (usually?) does not work. And when it doesn't, it just spews
     * escape codes all over the place and generally makes things ugly :(
     *
     * If `useBracketedPaste` has been set to true, but the current readline
     * implementation is anything besides GNU readline, this will return false.
     *
     * @return bool True if the shell should use bracketed paste
     */
   
public function useBracketedPaste()
    {
       
// For now, only the GNU readline implementation supports bracketed paste.
       
$supported = ($this->getReadlineClass() === Readline\GNUReadline::class);

        return
$supported && $this->useBracketedPaste;

       
// @todo mebbe turn this on by default some day?
        // return isset($this->useBracketedPaste) ? ($supported && $this->useBracketedPaste) : $supported;
   
}

   
/**
     * Check whether this PHP instance has Pcntl available.
     *
     * @return bool True if Pcntl is available
     */
   
public function hasPcntl()
    {
        return
$this->hasPcntl;
    }

   
/**
     * Enable or disable Pcntl usage.
     *
     * @param bool $usePcntl
     */
   
public function setUsePcntl($usePcntl)
    {
       
$this->usePcntl = (bool) $usePcntl;
    }

   
/**
     * Check whether to use Pcntl.
     *
     * If `setUsePcntl` has been set to true, but Pcntl is not actually
     * available, this will return false.
     *
     * @return bool True if the current Shell should use Pcntl
     */
   
public function usePcntl()
    {
        return isset(
$this->usePcntl) ? ($this->hasPcntl && $this->usePcntl) : $this->hasPcntl;
    }

   
/**
     * Check whether to use raw output.
     *
     * This is set by the --raw-output (-r) flag, and really only makes sense
     * when non-interactive, e.g. executing stdin.
     *
     * @return bool true if raw output is enabled
     */
   
public function rawOutput()
    {
        return
$this->rawOutput;
    }

   
/**
     * Enable or disable raw output.
     *
     * @param bool $rawOutput
     */
   
public function setRawOutput($rawOutput)
    {
       
$this->rawOutput = (bool) $rawOutput;
    }

   
/**
     * Enable or disable strict requirement of semicolons.
     *
     * @see self::requireSemicolons()
     *
     * @param bool $requireSemicolons
     */
   
public function setRequireSemicolons($requireSemicolons)
    {
       
$this->requireSemicolons = (bool) $requireSemicolons;
    }

   
/**
     * Check whether to require semicolons on all statements.
     *
     * By default, PsySH will automatically insert semicolons at the end of
     * statements if they're missing. To strictly require semicolons, set
     * `requireSemicolons` to true.
     *
     * @return bool
     */
   
public function requireSemicolons()
    {
        return
$this->requireSemicolons;
    }

   
/**
     * Enable or disable Unicode in PsySH specific output.
     *
     * Note that this does not disable Unicode output in general, it just makes
     * it so PsySH won't output any itself.
     *
     * @param bool $useUnicode
     */
   
public function setUseUnicode($useUnicode)
    {
       
$this->useUnicode = (bool) $useUnicode;
    }

   
/**
     * Check whether to use Unicode in PsySH specific output.
     *
     * Note that this does not disable Unicode output in general, it just makes
     * it so PsySH won't output any itself.
     *
     * @return bool
     */
   
public function useUnicode()
    {
        if (isset(
$this->useUnicode)) {
            return
$this->useUnicode;
        }

       
// @todo detect `chsh` != 65001 on Windows and return false
       
return true;
    }

   
/**
     * Set the error logging level.
     *
     * @see self::errorLoggingLevel
     *
     * @param bool $errorLoggingLevel
     */
   
public function setErrorLoggingLevel($errorLoggingLevel)
    {
       
$this->errorLoggingLevel = (E_ALL | E_STRICT) & $errorLoggingLevel;
    }

   
/**
     * Get the current error logging level.
     *
     * By default, PsySH will automatically log all errors, regardless of the
     * current `error_reporting` level.
     *
     * Set `errorLoggingLevel` to 0 to prevent logging non-thrown errors. Set it
     * to any valid error_reporting value to log only errors which match that
     * level.
     *
     *     http://php.net/manual/en/function.error-reporting.php
     *
     * @return int
     */
   
public function errorLoggingLevel()
    {
        return
$this->errorLoggingLevel;
    }

   
/**
     * Set a CodeCleaner service instance.
     *
     * @param CodeCleaner $cleaner
     */
   
public function setCodeCleaner(CodeCleaner $cleaner)
    {
       
$this->cleaner = $cleaner;
    }

   
/**
     * Get a CodeCleaner service instance.
     *
     * If none has been explicitly defined, this will create a new instance.
     *
     * @return CodeCleaner
     */
   
public function getCodeCleaner()
    {
        if (!isset(
$this->cleaner)) {
           
$this->cleaner = new CodeCleaner();
        }

        return
$this->cleaner;
    }

   
/**
     * Enable or disable tab completion.
     *
     * @param bool $useTabCompletion
     */
   
public function setUseTabCompletion($useTabCompletion)
    {
       
$this->useTabCompletion = (bool) $useTabCompletion;
    }

   
/**
     * @deprecated Call `setUseTabCompletion` instead
     *
     * @param bool $useTabCompletion
     */
   
public function setTabCompletion($useTabCompletion)
    {
       
$this->setUseTabCompletion($useTabCompletion);
    }

   
/**
     * Check whether to use tab completion.
     *
     * If `setUseTabCompletion` has been set to true, but readline is not
     * actually available, this will return false.
     *
     * @return bool True if the current Shell should use tab completion
     */
   
public function useTabCompletion()
    {
        return isset(
$this->useTabCompletion) ? ($this->hasReadline && $this->useTabCompletion) : $this->hasReadline;
    }

   
/**
     * @deprecated Call `useTabCompletion` instead
     *
     * @return bool
     */
   
public function getTabCompletion()
    {
        return
$this->useTabCompletion();
    }

   
/**
     * Set the Shell Output service.
     *
     * @param ShellOutput $output
     */
   
public function setOutput(ShellOutput $output)
    {
       
$this->output = $output;
       
$this->pipedOutput = null; // Reset cached pipe info
       
$this->applyFormatterStyles();
    }

   
/**
     * Get a Shell Output service instance.
     *
     * If none has been explicitly provided, this will create a new instance
     * with the configured verbosity and output pager supplied by self::getPager
     *
     * @see self::verbosity
     * @see self::getPager
     *
     * @return ShellOutput
     */
   
public function getOutput()
    {
        if (!isset(
$this->output)) {
           
$this->setOutput(new ShellOutput(
               
$this->getOutputVerbosity(),
               
null,
               
null,
               
$this->getPager()
            ));

           
// This is racy because `getOutputDecorated` needs access to the
            // output stream to figure out if it's piped or not, so create it
            // first, then update after we have a stream.
           
$decorated = $this->getOutputDecorated();
            if (
$decorated !== null) {
               
$this->output->setDecorated($decorated);
            }
        }

        return
$this->output;
    }

   
/**
     * Get the decoration (i.e. color) setting for the Shell Output service.
     *
     * @return bool|null 3-state boolean corresponding to the current color mode
     */
   
public function getOutputDecorated()
    {
        switch (
$this->colorMode()) {
            case
self::COLOR_MODE_AUTO:
                return
$this->outputIsPiped() ? false : null;
            case
self::COLOR_MODE_FORCED:
                return
true;
            case
self::COLOR_MODE_DISABLED:
                return
false;
        }
    }

   
/**
     * Get the interactive setting for shell input.
     *
     * @return bool
     */
   
public function getInputInteractive()
    {
        switch (
$this->interactiveMode()) {
            case
self::INTERACTIVE_MODE_AUTO:
                return !
$this->inputIsPiped();
            case
self::INTERACTIVE_MODE_FORCED:
                return
true;
            case
self::INTERACTIVE_MODE_DISABLED:
                return
false;
        }
    }

   
/**
     * Set the OutputPager service.
     *
     * If a string is supplied, a ProcOutputPager will be used which shells out
     * to the specified command.
     *
     * @throws \InvalidArgumentException if $pager is not a string or OutputPager instance
     *
     * @param string|OutputPager $pager
     */
   
public function setPager($pager)
    {
        if (
$pager && !\is_string($pager) && !$pager instanceof OutputPager) {
            throw new \
InvalidArgumentException('Unexpected pager instance');
        }

       
$this->pager = $pager;
    }

   
/**
     * Get an OutputPager instance or a command for an external Proc pager.
     *
     * If no Pager has been explicitly provided, and Pcntl is available, this
     * will default to `cli.pager` ini value, falling back to `which less`.
     *
     * @return string|OutputPager
     */
   
public function getPager()
    {
        if (!isset(
$this->pager) && $this->usePcntl()) {
            if (
$pager = \ini_get('cli.pager')) {
               
// use the default pager
               
$this->pager = $pager;
            } elseif (
$less = \exec('which less 2>/dev/null')) {
               
// check for the presence of less...
               
$this->pager = $less . ' -R -S -F -X';
            }
        }

        return
$this->pager;
    }

   
/**
     * Set the Shell AutoCompleter service.
     *
     * @param AutoCompleter $autoCompleter
     */
   
public function setAutoCompleter(AutoCompleter $autoCompleter)
    {
       
$this->autoCompleter = $autoCompleter;
    }

   
/**
     * Get an AutoCompleter service instance.
     *
     * @return AutoCompleter
     */
   
public function getAutoCompleter()
    {
        if (!isset(
$this->autoCompleter)) {
           
$this->autoCompleter = new AutoCompleter();
        }

        return
$this->autoCompleter;
    }

   
/**
     * @deprecated Nothing should be using this anymore
     *
     * @return array
     */
   
public function getTabCompletionMatchers()
    {
        return [];
    }

   
/**
     * Add tab completion matchers to the AutoCompleter.
     *
     * This will buffer new matchers in the event that the Shell has not yet
     * been instantiated. This allows the user to specify matchers in their
     * config rc file, despite the fact that their file is needed in the Shell
     * constructor.
     *
     * @param array $matchers
     */
   
public function addMatchers(array $matchers)
    {
       
$this->newMatchers = \array_merge($this->newMatchers, $matchers);
        if (isset(
$this->shell)) {
           
$this->doAddMatchers();
        }
    }

   
/**
     * Internal method for adding tab completion matchers. This will set any new
     * matchers once a Shell is available.
     */
   
private function doAddMatchers()
    {
        if (!empty(
$this->newMatchers)) {
           
$this->shell->addMatchers($this->newMatchers);
           
$this->newMatchers = [];
        }
    }

   
/**
     * @deprecated Use `addMatchers` instead
     *
     * @param array $matchers
     */
   
public function addTabCompletionMatchers(array $matchers)
    {
       
$this->addMatchers($matchers);
    }

   
/**
     * Add commands to the Shell.
     *
     * This will buffer new commands in the event that the Shell has not yet
     * been instantiated. This allows the user to specify commands in their
     * config rc file, despite the fact that their file is needed in the Shell
     * constructor.
     *
     * @param array $commands
     */
   
public function addCommands(array $commands)
    {
       
$this->newCommands = \array_merge($this->newCommands, $commands);
        if (isset(
$this->shell)) {
           
$this->doAddCommands();
        }
    }

   
/**
     * Internal method for adding commands. This will set any new commands once
     * a Shell is available.
     */
   
private function doAddCommands()
    {
        if (!empty(
$this->newCommands)) {
           
$this->shell->addCommands($this->newCommands);
           
$this->newCommands = [];
        }
    }

   
/**
     * Set the Shell backreference and add any new commands to the Shell.
     *
     * @param Shell $shell
     */
   
public function setShell(Shell $shell)
    {
       
$this->shell = $shell;
       
$this->doAddCommands();
       
$this->doAddMatchers();
    }

   
/**
     * Set the PHP manual database file.
     *
     * This file should be an SQLite database generated from the phpdoc source
     * with the `bin/build_manual` script.
     *
     * @param string $filename
     */
   
public function setManualDbFile($filename)
    {
       
$this->manualDbFile = (string) $filename;
    }

   
/**
     * Get the current PHP manual database file.
     *
     * @return string Default: '~/.local/share/psysh/php_manual.sqlite'
     */
   
public function getManualDbFile()
    {
        if (isset(
$this->manualDbFile)) {
            return
$this->manualDbFile;
        }

       
$files = ConfigPaths::getDataFiles(['php_manual.sqlite'], $this->dataDir);
        if (!empty(
$files)) {
            if (
$this->warnOnMultipleConfigs && \count($files) > 1) {
               
$msg = \sprintf('Multiple manual database files found: %s. Using %s', \implode(', ', $files), $files[0]);
                \
trigger_error($msg, E_USER_NOTICE);
            }

            return
$this->manualDbFile = $files[0];
        }
    }

   
/**
     * Get a PHP manual database connection.
     *
     * @return \PDO
     */
   
public function getManualDb()
    {
        if (!isset(
$this->manualDb)) {
           
$dbFile = $this->getManualDbFile();
            if (\
is_file($dbFile)) {
                try {
                   
$this->manualDb = new \PDO('sqlite:' . $dbFile);
                } catch (\
PDOException $e) {
                    if (
$e->getMessage() === 'could not find driver') {
                        throw new
RuntimeException('SQLite PDO driver not found', 0, $e);
                    } else {
                        throw
$e;
                    }
                }
            }
        }

        return
$this->manualDb;
    }

   
/**
     * Add an array of casters definitions.
     *
     * @param array $casters
     */
   
public function addCasters(array $casters)
    {
       
$this->getPresenter()->addCasters($casters);
    }

   
/**
     * Get the Presenter service.
     *
     * @return Presenter
     */
   
public function getPresenter()
    {
        if (!isset(
$this->presenter)) {
           
$this->presenter = new Presenter($this->getOutput()->getFormatter(), $this->forceArrayIndexes());
        }

        return
$this->presenter;
    }

   
/**
     * Enable or disable warnings on multiple configuration or data files.
     *
     * @see self::warnOnMultipleConfigs()
     *
     * @param bool $warnOnMultipleConfigs
     */
   
public function setWarnOnMultipleConfigs($warnOnMultipleConfigs)
    {
       
$this->warnOnMultipleConfigs = (bool) $warnOnMultipleConfigs;
    }

   
/**
     * Check whether to warn on multiple configuration or data files.
     *
     * By default, PsySH will use the file with highest precedence, and will
     * silently ignore all others. With this enabled, a warning will be emitted
     * (but not an exception thrown) if multiple configuration or data files
     * are found.
     *
     * This will default to true in a future release, but is false for now.
     *
     * @return bool
     */
   
public function warnOnMultipleConfigs()
    {
        return
$this->warnOnMultipleConfigs;
    }

   
/**
     * Set the current color mode.
     *
     * @param string $colorMode
     */
   
public function setColorMode($colorMode)
    {
       
$validColorModes = [
           
self::COLOR_MODE_AUTO,
           
self::COLOR_MODE_FORCED,
           
self::COLOR_MODE_DISABLED,
        ];

        if (!\
in_array($colorMode, $validColorModes)) {
           
// @todo Fix capitalization for 0.11.0
           
throw new \InvalidArgumentException('invalid color mode: ' . $colorMode);
        }

       
$this->colorMode = $colorMode;
    }

   
/**
     * Get the current color mode.
     *
     * @return string
     */
   
public function colorMode()
    {
        return
$this->colorMode;
    }

   
/**
     * Set the shell's interactive mode.
     *
     * @param string $interactiveMode
     */
   
public function setInteractiveMode($interactiveMode)
    {
       
$validInteractiveModes = [
           
self::INTERACTIVE_MODE_AUTO,
           
self::INTERACTIVE_MODE_FORCED,
           
self::INTERACTIVE_MODE_DISABLED,
        ];

        if (!\
in_array($interactiveMode, $validInteractiveModes)) {
            throw new \
InvalidArgumentException('Invalid interactive mode: ' . $interactiveMode);
        }

       
$this->interactiveMode = $interactiveMode;
    }

   
/**
     * Get the current interactive mode.
     *
     * @return string
     */
   
public function interactiveMode()
    {
        return
$this->interactiveMode;
    }

   
/**
     * Set an update checker service instance.
     *
     * @param Checker $checker
     */
   
public function setChecker(Checker $checker)
    {
       
$this->checker = $checker;
    }

   
/**
     * Get an update checker service instance.
     *
     * If none has been explicitly defined, this will create a new instance.
     *
     * @return Checker
     */
   
public function getChecker()
    {
        if (!isset(
$this->checker)) {
           
$interval = $this->getUpdateCheck();
            switch (
$interval) {
                case
Checker::ALWAYS:
                   
$this->checker = new GitHubChecker();
                    break;

                case
Checker::DAILY:
                case
Checker::WEEKLY:
                case
Checker::MONTHLY:
                   
$checkFile = $this->getUpdateCheckCacheFile();
                    if (
$checkFile === false) {
                       
$this->checker = new NoopChecker();
                    } else {
                       
$this->checker = new IntervalChecker($checkFile, $interval);
                    }
                    break;

                case
Checker::NEVER:
                   
$this->checker = new NoopChecker();
                    break;
            }
        }

        return
$this->checker;
    }

   
/**
     * Get the current update check interval.
     *
     * One of 'always', 'daily', 'weekly', 'monthly' or 'never'. If none is
     * explicitly set, default to 'weekly'.
     *
     * @return string
     */
   
public function getUpdateCheck()
    {
        return isset(
$this->updateCheck) ? $this->updateCheck : Checker::WEEKLY;
    }

   
/**
     * Set the update check interval.
     *
     * @throws \InvalidArgumentException if the update check interval is unknown
     *
     * @param string $interval
     */
   
public function setUpdateCheck($interval)
    {
       
$validIntervals = [
           
Checker::ALWAYS,
           
Checker::DAILY,
           
Checker::WEEKLY,
           
Checker::MONTHLY,
           
Checker::NEVER,
        ];

        if (!\
in_array($interval, $validIntervals)) {
           
// @todo Fix capitalization for 0.11.0
           
throw new \InvalidArgumentException('invalid update check interval: ' . $interval);
        }

       
$this->updateCheck = $interval;
    }

   
/**
     * Get a cache file path for the update checker.
     *
     * @return string|false Return false if config file/directory is not writable
     */
   
public function getUpdateCheckCacheFile()
    {
       
$dir = $this->configDir ?: ConfigPaths::getCurrentConfigDir();

        return
ConfigPaths::touchFileWithMkdir($dir . '/update_check.json');
    }

   
/**
     * Set the startup message.
     *
     * @param string $message
     */
   
public function setStartupMessage($message)
    {
       
$this->startupMessage = $message;
    }

   
/**
     * Get the startup message.
     *
     * @return string|null
     */
   
public function getStartupMessage()
    {
        return
$this->startupMessage;
    }

   
/**
     * Set the prompt.
     *
     * @param string $prompt
     */
   
public function setPrompt($prompt)
    {
       
$this->prompt = $prompt;
    }

   
/**
     * Get the prompt.
     *
     * @return string
     */
   
public function getPrompt()
    {
        return
$this->prompt;
    }

   
/**
     * Get the force array indexes.
     *
     * @return bool
     */
   
public function forceArrayIndexes()
    {
        return
$this->forceArrayIndexes;
    }

   
/**
     * Set the force array indexes.
     *
     * @param bool $forceArrayIndexes
     */
   
public function setForceArrayIndexes($forceArrayIndexes)
    {
       
$this->forceArrayIndexes = $forceArrayIndexes;
    }

   
/**
     * Set the shell output formatter styles.
     *
     * Accepts a map from style name to [fg, bg, options], for example:
     *
     *     [
     *         'error' => ['white', 'red', ['bold']],
     *         'warning' => ['black', 'yellow'],
     *     ]
     *
     * Foreground, background or options can be null, or even omitted entirely.
     *
     * @see ShellOutput::initFormatters
     *
     * @param array $formatterStyles
     */
   
public function setFormatterStyles(array $formatterStyles)
    {
        foreach (
$formatterStyles as $name => $style) {
            list(
$fg, $bg, $opts) = \array_pad($style, 3, null);
           
$this->formatterStyles[$name] = new OutputFormatterStyle($fg ?: null, $bg ?: null, $opts ?: []);
        }

        if (isset(
$this->output)) {
           
$this->applyFormatterStyles();
        }
    }

   
/**
     * Internal method for applying output formatter style customization.
     *
     * This is called on initialization of the shell output, and again if the
     * formatter styles config is updated.
     */
   
private function applyFormatterStyles()
    {
       
$formatter = $this->output->getFormatter();
        foreach (
$this->formatterStyles as $name => $style) {
           
$formatter->setStyle($name, $style);
        }
    }

   
/**
     * Get the configured output verbosity.
     *
     * @return string
     */
   
public function verbosity()
    {
        return
$this->verbosity;
    }

   
/**
     * Set the shell output verbosity.
     *
     * Accepts OutputInterface verbosity constants.
     *
     * @param string $verbosity
     */
   
public function setVerbosity($verbosity)
    {
       
$validVerbosityLevels = [
           
self::VERBOSITY_QUIET,
           
self::VERBOSITY_NORMAL,
           
self::VERBOSITY_VERBOSE,
           
self::VERBOSITY_VERY_VERBOSE,
           
self::VERBOSITY_DEBUG,
        ];

        if (!\
in_array($verbosity, $validVerbosityLevels)) {
            throw new \
InvalidArgumentException('Invalid verbosity level: ' . $verbosity);
        }

       
$this->verbosity = $verbosity;

        if (isset(
$this->output)) {
           
$this->output->setVerbosity($this->getOutputVerbosity());
        }
    }

   
/**
     * Map the verbosity configuration to OutputInterface verbosity constants.
     *
     * @return int OutputInterface verbosity level
     */
   
public function getOutputVerbosity()
    {
        switch (
$this->verbosity()) {
            case
self::VERBOSITY_QUIET:
                return
OutputInterface::VERBOSITY_QUIET;
            case
self::VERBOSITY_VERBOSE:
                return
OutputInterface::VERBOSITY_VERBOSE;
            case
self::VERBOSITY_VERY_VERBOSE:
                return
OutputInterface::VERBOSITY_VERY_VERBOSE;
            case
self::VERBOSITY_DEBUG:
                return
OutputInterface::VERBOSITY_DEBUG;
            case
self::VERBOSITY_NORMAL:
            default:
                return
OutputInterface::VERBOSITY_NORMAL;
        }
    }

   
/**
     * Guess whether stdin is piped.
     *
     * This is mostly useful for deciding whether to use non-interactive mode.
     *
     * @return bool
     */
   
public function inputIsPiped()
    {
        if (
$this->pipedInput === null) {
           
$this->pipedInput = \defined('STDIN') && static::looksLikeAPipe(\STDIN);
        }

        return
$this->pipedInput;
    }

   
/**
     * Guess whether shell output is piped.
     *
     * This is mostly useful for deciding whether to use non-decorated output.
     *
     * @return bool
     */
   
public function outputIsPiped()
    {
        if (
$this->pipedOutput === null) {
           
$this->pipedOutput = static::looksLikeAPipe($this->getOutput()->getStream());
        }

        return
$this->pipedOutput;
    }

   
/**
     * Guess whether an input or output stream is piped.
     *
     * @param resource|int $stream
     *
     * @return bool
     */
   
private static function looksLikeAPipe($stream)
    {
        if (\
function_exists('posix_isatty')) {
            return !\
posix_isatty($stream);
        }

       
$stat = \fstat($stream);
       
$mode = $stat['mode'] & 0170000;

        return
$mode === 0010000 || $mode === 0040000 || $mode === 0100000 || $mode === 0120000;
    }
}