composer/src/Composer/Command/ShowCommand.php

<?php

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Composer\Command;

use Composer\DependencyResolver\Pool;
use Composer\DependencyResolver\DefaultPolicy;
use Composer\Package\CompletePackageInterface;
use Composer\Package\Version\VersionParser;
use Composer\Package\BasePackage;
use Composer\Package\Version\VersionSelector;
use Composer\Plugin\CommandEvent;
use Composer\Plugin\PluginEvents;
use Composer\Package\PackageInterface;
use Composer\Semver\Constraint\ConstraintInterface;
use Composer\Util\Platform;
use Symfony\Component\Console\Formatter\OutputFormatterStyle;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Composer\Repository\ArrayRepository;
use Composer\Repository\CompositeRepository;
use Composer\Repository\ComposerRepository;
use Composer\Repository\PlatformRepository;
use Composer\Repository\RepositoryInterface;
use Composer\Repository\RepositoryFactory;
use Composer\Spdx\SpdxLicenses;
use Composer\Composer;
use Composer\Semver\Semver;

/**
 * @author Robert Schönthal <seroscho@googlemail.com>
 * @author Jordi Boggiano <j.boggiano@seld.be>
 * @author Jérémy Romey <jeremyFreeAgent>
 */
class ShowCommand extends BaseCommand
{
    /** @var VersionParser */
    protected $versionParser;
    protected $colors;

    /** @var Pool */
    private $pool;

    protected function configure()
    {
        $this
            ->setName('show')
            ->setAliases(array('info'))
            ->setDescription('Show information about packages.')
            ->setDefinition(array(
                new InputArgument('package', InputArgument::OPTIONAL, 'Package to inspect. Or a name including a wildcard (*) to filter lists of packages instead.'),
                new InputArgument('version', InputArgument::OPTIONAL, 'Version or version constraint to inspect'),
                new InputOption('all', null, InputOption::VALUE_NONE, 'List all packages'),
                new InputOption('installed', 'i', InputOption::VALUE_NONE, 'List installed packages only (enabled by default, only present for BC).'),
                new InputOption('platform', 'p', InputOption::VALUE_NONE, 'List platform packages only'),
                new InputOption('available', 'a', InputOption::VALUE_NONE, 'List available packages only'),
                new InputOption('self', 's', InputOption::VALUE_NONE, 'Show the root package information'),
                new InputOption('name-only', 'N', InputOption::VALUE_NONE, 'List package names only'),
                new InputOption('path', 'P', InputOption::VALUE_NONE, 'Show package paths'),
                new InputOption('tree', 't', InputOption::VALUE_NONE, 'List the dependencies as a tree'),
                new InputOption('latest', 'l', InputOption::VALUE_NONE, 'Show the latest version'),
                new InputOption('outdated', 'o', InputOption::VALUE_NONE, 'Show the latest version but only for packages that are outdated'),
                new InputOption('minor-only', 'm', InputOption::VALUE_NONE, 'Show only packages that have minor SemVer-compatible updates. Use with the --outdated option.'),
                new InputOption('direct', 'D', InputOption::VALUE_NONE, 'Shows only packages that are directly required by the root package'),
                new InputOption('strict', null, InputOption::VALUE_NONE, 'Return a non-zero exit code when there are outdated packages'),
            ))
            ->setHelp(<<<EOT
The show command displays detailed information about a package, or
lists all packages available.

EOT
            )
        ;
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $this->versionParser = new VersionParser;
        if ($input->getOption('tree')) {
            $this->initStyles($output);
        }

        $composer = $this->getComposer(false);
        $io = $this->getIO();

        if ($input->getOption('installed')) {
            $io->writeError('<warning>You are using the deprecated option "installed". Only installed packages are shown by default now. The --all option can be used to show all packages.</warning>');
        }

        if ($input->getOption('outdated')) {
            $input->setOption('latest', true);
        }

        if ($input->getOption('direct') && ($input->getOption('all') || $input->getOption('available') || $input->getOption('platform'))) {
            $io->writeError('The --direct (-D) option is not usable in combination with --all, --platform (-p) or --available (-a)');

            return 1;
        }

        if ($input->getOption('tree') && ($input->getOption('all') || $input->getOption('available'))) {
            $io->writeError('The --tree (-t) option is not usable in combination with --all or --available (-a)');

            return 1;
        }

        // init repos
        $platformOverrides = array();
        if ($composer) {
            $platformOverrides = $composer->getConfig()->get('platform') ?: array();
        }
        $platformRepo = new PlatformRepository(array(), $platformOverrides);
        $phpVersion = $platformRepo->findPackage('php', '*')->getVersion();

        if ($input->getOption('self')) {
            $package = $this->getComposer()->getPackage();
            $repos = $installedRepo = new ArrayRepository(array($package));
        } elseif ($input->getOption('platform')) {
            $repos = $installedRepo = $platformRepo;
        } elseif ($input->getOption('available')) {
            $installedRepo = $platformRepo;
            if ($composer) {
                $repos = new CompositeRepository($composer->getRepositoryManager()->getRepositories());
            } else {
                $defaultRepos = RepositoryFactory::defaultRepos($io);
                $repos = new CompositeRepository($defaultRepos);
                $io->writeError('No composer.json found in the current directory, showing available packages from ' . implode(', ', array_keys($defaultRepos)));
            }
        } elseif ($input->getOption('all') && $composer) {
            $localRepo = $composer->getRepositoryManager()->getLocalRepository();
            $installedRepo = new CompositeRepository(array($localRepo, $platformRepo));
            $repos = new CompositeRepository(array_merge(array($installedRepo), $composer->getRepositoryManager()->getRepositories()));
        } elseif ($input->getOption('all')) {
            $defaultRepos = RepositoryFactory::defaultRepos($io);
            $io->writeError('No composer.json found in the current directory, showing available packages from ' . implode(', ', array_keys($defaultRepos)));
            $installedRepo = $platformRepo;
            $repos = new CompositeRepository(array_merge(array($installedRepo), $defaultRepos));
        } else {
            $repos = $installedRepo = $this->getComposer()->getRepositoryManager()->getLocalRepository();
        }

        if ($composer) {
            $commandEvent = new CommandEvent(PluginEvents::COMMAND, 'show', $input, $output);
            $composer->getEventDispatcher()->dispatch($commandEvent->getName(), $commandEvent);
        }

        if ($input->getOption('latest') && null === $composer) {
            $io->writeError('No composer.json found in the current directory, disabling "latest" option');
            $input->setOption('latest', false);
        }

        $packageFilter = $input->getArgument('package');

        // show single package or single version
        if (($packageFilter && false === strpos($packageFilter, '*')) || !empty($package)) {
            if (empty($package)) {
                list($package, $versions) = $this->getPackage($installedRepo, $repos, $input->getArgument('package'), $input->getArgument('version'));

                if (empty($package)) {
                    $options = $input->getOptions();
                    if (!isset($options['working-dir']) || !file_exists('composer.json')) {
                        throw new \InvalidArgumentException('Package ' . $packageFilter . ' not found');
                    }

                    $io->writeError('Package ' . $packageFilter . ' not found in ' . $options['working-dir'] . '/composer.json');
                    return 1;
                }
            } else {
                $versions = array($package->getPrettyVersion() => $package->getVersion());
            }

            if ($input->getOption('tree')) {
                $this->displayPackageTree($package, $installedRepo, $repos);
            } else {
                $latestPackage = null;
                if ($input->getOption('latest')) {
                    $latestPackage = $this->findLatestPackage($package, $composer, $phpVersion);
                }
                $this->printMeta($package, $versions, $installedRepo, $latestPackage ?: null);
                $this->printLinks($package, 'requires');
                $this->printLinks($package, 'devRequires', 'requires (dev)');
                if ($package->getSuggests()) {
                    $io->write("\n<info>suggests</info>");
                    foreach ($package->getSuggests() as $suggested => $reason) {
                        $io->write($suggested . ' <comment>' . $reason . '</comment>');
                    }
                }
                $this->printLinks($package, 'provides');
                $this->printLinks($package, 'conflicts');
                $this->printLinks($package, 'replaces');
            }

            return;
        }

        // show tree view if requested
        if ($input->getOption('tree')) {
            $rootRequires = $this->getRootRequires();
            foreach ($installedRepo->getPackages() as $package) {
                if (in_array($package->getName(), $rootRequires, true)) {
                    $this->displayPackageTree($package, $installedRepo, $repos);
                }
            }

            return 0;
        }

        if ($repos instanceof CompositeRepository) {
            $repos = $repos->getRepositories();
        } elseif (!is_array($repos)) {
            $repos = array($repos);
        }

        // list packages
        $packages = array();
        if (null !== $packageFilter) {
            $packageFilter = '{^'.str_replace('\\*', '.*?', preg_quote($packageFilter)).'$}i';
        }

        $packageListFilter = array();
        if ($input->getOption('direct')) {
            $packageListFilter = $this->getRootRequires();
        }

        foreach ($repos as $repo) {
            if ($repo === $platformRepo) {
                $type = '<info>platform</info>:';
            } elseif (
                $repo === $installedRepo
                || ($installedRepo instanceof CompositeRepository && in_array($repo, $installedRepo->getRepositories(), true))
            ) {
                $type = '<info>installed</info>:';
            } else {
                $type = '<comment>available</comment>:';
            }
            if ($repo instanceof ComposerRepository && $repo->hasProviders()) {
                foreach ($repo->getProviderNames() as $name) {
                    if (!$packageFilter || preg_match($packageFilter, $name)) {
                        $packages[$type][$name] = $name;
                    }
                }
            } else {
                foreach ($repo->getPackages() as $package) {
                    if (!isset($packages[$type][$package->getName()])
                        || !is_object($packages[$type][$package->getName()])
                        || version_compare($packages[$type][$package->getName()]->getVersion(), $package->getVersion(), '<')
                    ) {
                        if (!$packageFilter || preg_match($packageFilter, $package->getName())) {
                            if (!$packageListFilter || in_array($package->getName(), $packageListFilter, true)) {
                                $packages[$type][$package->getName()] = $package;
                            }
                        }
                    }
                }
            }
        }

        $showAllTypes = $input->getOption('all');
        $showLatest = $input->getOption('latest');
        $showMinorOnly = $input->getOption('minor-only');
        $indent = $showAllTypes ? '  ' : '';
        $latestPackages = array();
        foreach (array('<info>platform</info>:' => true, '<comment>available</comment>:' => false, '<info>installed</info>:' => true) as $type => $showVersion) {
            if (isset($packages[$type])) {
                ksort($packages[$type]);

                $nameLength = $versionLength = $latestLength = 0;
                foreach ($packages[$type] as $package) {
                    if (is_object($package)) {
                        $nameLength = max($nameLength, strlen($package->getPrettyName()));
                        if ($showVersion) {
                            $versionLength = max($versionLength, strlen($package->getFullPrettyVersion()));
                            if ($showLatest) {

                                $latestPackage = $this->findLatestPackage($package, $composer, $phpVersion, $showMinorOnly);
                                if ($latestPackage === false) {
                                    continue;
                                }

                                $latestPackages[$package->getPrettyName()] = $latestPackage;
                                $latestLength =  max($latestLength, strlen($latestPackage->getFullPrettyVersion()));
                            }
                        }
                    } else {
                        $nameLength = max($nameLength, strlen($package));
                    }
                }
                list($width) = $this->getApplication()->getTerminalDimensions();
                if (null === $width) {
                    // In case the width is not detected, we're probably running the command
                    // outside of a real terminal, use space without a limit
                    $width = PHP_INT_MAX;
                }
                if (Platform::isWindows()) {
                    $width--;
                }

                if ($input->getOption('path') && null === $composer) {
                    $io->writeError('No composer.json found in the current directory, disabling "path" option');
                    $input->setOption('path', false);
                }

                $writePath = !$input->getOption('name-only') && $input->getOption('path');
                $writeVersion = !$input->getOption('name-only') && !$input->getOption('path') && $showVersion && ($nameLength + $versionLength + 3 <= $width);
                $writeLatest = $writeVersion && $showLatest && ($nameLength + $versionLength + $latestLength + 3 <= $width);
                $writeDescription = !$input->getOption('name-only') && !$input->getOption('path') && ($nameLength + $versionLength + $latestLength + 24 <= $width);
                if ($writeLatest && !$io->isDecorated()) {
                    $latestLength += 2;
                }
                $hasOutdatedPackages = false;

                if ($showAllTypes) {
                    $io->write($type);
                }
                foreach ($packages[$type] as $package) {
                    if (is_object($package)) {
                        $latestPackage = null;
                        if ($showLatest && isset($latestPackages[$package->getPrettyName()])) {
                            $latestPackage = $latestPackages[$package->getPrettyName()];
                        }
                        if ($input->getOption('outdated') && $latestPackage && $latestPackage->getFullPrettyVersion() === $package->getFullPrettyVersion() && !$latestPackage->isAbandoned()) {
                            continue;
                        } elseif ($input->getOption('outdated')) {
                            $hasOutdatedPackages = true;
                        }

                        $io->write($indent . str_pad($package->getPrettyName(), $nameLength, ' '), false);

                        if ($writeVersion) {
                            $io->write(' ' . str_pad($package->getFullPrettyVersion(), $versionLength, ' '), false);
                        }

                        if ($writeLatest && $latestPackage) {
                            $latestVersion = $latestPackage->getFullPrettyVersion();
                            $style = $this->getVersionStyle($latestPackage, $package);
                            if (!$io->isDecorated()) {
                                $latestVersion = str_replace(array('info', 'highlight', 'comment'), array('=', '!', '~'), $style) . ' ' . $latestVersion;
                            }
                            $io->write(' <'.$style.'>' . str_pad($latestVersion, $latestLength, ' ') . '</'.$style.'>', false);
                        }

                        if ($writeDescription) {
                            $description = strtok($package->getDescription(), "\r\n");
                            $remaining = $width - $nameLength - $versionLength - 4;
                            if ($writeLatest) {
                                $remaining -= $latestLength;
                            }
                            if (strlen($description) > $remaining) {
                                $description = substr($description, 0, $remaining - 3) . '...';
                            }
                            $io->write(' ' . $description, false);
                        }

                        if ($writePath) {
                            $path = strtok(realpath($composer->getInstallationManager()->getInstallPath($package)), "\r\n");
                            $io->write(' ' . $path, false);
                        }

                        if ($latestPackage && $latestPackage->isAbandoned()) {
                            $replacement = (is_string($latestPackage->getReplacementPackage()))
                                ? 'Use ' . $latestPackage->getReplacementPackage() . ' instead'
                                : 'No replacement was suggested';

                            $io->writeError('');
                            $io->writeError(
                                sprintf(
                                    "<warning>Package %s is abandoned, you should avoid using it. %s.</warning>",
                                    $package->getPrettyName(),
                                    $replacement
                                ),
                                false
                            );
                        }
                    } else {
                        $io->write($indent . $package, false);
                    }
                    $io->write('');
                }
                if ($showAllTypes) {
                    $io->write('');
                }
                if ($input->getOption('strict') && $hasOutdatedPackages) {
                    return 1;
                }
            }
        }
    }

    protected function getRootRequires()
    {
        $rootPackage = $this->getComposer()->getPackage();
        return array_map(
            'strtolower',
            array_keys(array_merge($rootPackage->getRequires(), $rootPackage->getDevRequires()))
        );
    }

    protected function getVersionStyle(PackageInterface $latestPackage, PackageInterface $package)
    {
        if ($latestPackage->getFullPrettyVersion() === $package->getFullPrettyVersion()) {
            // print green as it's up to date
            return 'info';
        }

        $constraint = $package->getVersion();
        if (0 !== strpos($constraint, 'dev-')) {
            $constraint = '^'.$constraint;
        }
        if ($latestPackage->getVersion() && Semver::satisfies($latestPackage->getVersion(), $constraint)) {
            // print red as it needs an immediate semver-compliant upgrade
            return 'highlight';
        }

        // print yellow as it needs an upgrade but has potential BC breaks so is not urgent
        return 'comment';
    }

    /**
     * finds a package by name and version if provided
     *
     * @param  RepositoryInterface        $installedRepo
     * @param  RepositoryInterface        $repos
     * @param  string                     $name
     * @param  ConstraintInterface|string $version
     * @throws \InvalidArgumentException
     * @return array                      array(CompletePackageInterface, array of versions)
     */
    protected function getPackage(RepositoryInterface $installedRepo, RepositoryInterface $repos, $name, $version = null)
    {
        $name = strtolower($name);
        $constraint = is_string($version) ? $this->versionParser->parseConstraints($version) : $version;

        $policy = new DefaultPolicy();
        $pool = new Pool('dev');
        $pool->addRepository($repos);

        $matchedPackage = null;
        $versions = array();
        $matches = $pool->whatProvides($name, $constraint);
        foreach ($matches as $index => $package) {
            // skip providers/replacers
            if ($package->getName() !== $name) {
                unset($matches[$index]);
                continue;
            }

            // select an exact match if it is in the installed repo and no specific version was required
            if (null === $version && $installedRepo->hasPackage($package)) {
                $matchedPackage = $package;
            }

            $versions[$package->getPrettyVersion()] = $package->getVersion();
            $matches[$index] = $package->getId();
        }

        // select preferred package according to policy rules
        if (!$matchedPackage && $matches && $preferred = $policy->selectPreferredPackages($pool, array(), $matches)) {
            $matchedPackage = $pool->literalToPackage($preferred[0]);
        }

        return array($matchedPackage, $versions);
    }

    /**
     * Prints package metadata.
     *
     * @param CompletePackageInterface $package
     * @param array                    $versions
     * @param RepositoryInterface      $installedRepo
     */
    protected function printMeta(CompletePackageInterface $package, array $versions, RepositoryInterface $installedRepo, PackageInterface $latestPackage = null)
    {
        $io = $this->getIO();
        $io->write('<info>name</info>     : ' . $package->getPrettyName());
        $io->write('<info>descrip.</info> : ' . $package->getDescription());
        $io->write('<info>keywords</info> : ' . implode(', ', $package->getKeywords() ?: array()));
        $this->printVersions($package, $versions, $installedRepo);
        if ($latestPackage) {
            $style = $this->getVersionStyle($latestPackage, $package);
            $io->write('<info>latest</info>   : <'.$style.'>' . $latestPackage->getPrettyVersion() . '</'.$style.'>');
        } else {
            $latestPackage = $package;
        }
        $io->write('<info>type</info>     : ' . $package->getType());
        $this->printLicenses($package);
        $io->write('<info>source</info>   : ' . sprintf('[%s] <comment>%s</comment> %s', $package->getSourceType(), $package->getSourceUrl(), $package->getSourceReference()));
        $io->write('<info>dist</info>     : ' . sprintf('[%s] <comment>%s</comment> %s', $package->getDistType(), $package->getDistUrl(), $package->getDistReference()));
        $io->write('<info>names</info>    : ' . implode(', ', $package->getNames()));

        if ($latestPackage->isAbandoned()) {
            $replacement = ($latestPackage->getReplacementPackage() !== null)
                ? ' The author suggests using the ' . $latestPackage->getReplacementPackage(). ' package instead.'
                : null;

            $io->writeError(
                sprintf('<warning>Attention: This package is abandoned and no longer maintained.%s</warning>', $replacement)
            );
        }

        if ($package->getSupport()) {
            $io->write("\n<info>support</info>");
            foreach ($package->getSupport() as $type => $value) {
                $io->write('<comment>' . $type . '</comment> : '.$value);
            }
        }

        if ($package->getAutoload()) {
            $io->write("\n<info>autoload</info>");
            foreach ($package->getAutoload() as $type => $autoloads) {
                $io->write('<comment>' . $type . '</comment>');

                if ($type === 'psr-0') {
                    foreach ($autoloads as $name => $path) {
                        $io->write(($name ?: '*') . ' => ' . (is_array($path) ? implode(', ', $path) : ($path ?: '.')));
                    }
                } elseif ($type === 'psr-4') {
                    foreach ($autoloads as $name => $path) {
                        $io->write(($name ?: '*') . ' => ' . (is_array($path) ? implode(', ', $path) : ($path ?: '.')));
                    }
                } elseif ($type === 'classmap') {
                    $io->write(implode(', ', $autoloads));
                }
            }
            if ($package->getIncludePaths()) {
                $io->write('<comment>include-path</comment>');
                $io->write(implode(', ', $package->getIncludePaths()));
            }
        }
    }

    /**
     * Prints all available versions of this package and highlights the installed one if any.
     *
     * @param CompletePackageInterface $package
     * @param array                    $versions
     * @param RepositoryInterface      $installedRepo
     */
    protected function printVersions(CompletePackageInterface $package, array $versions, RepositoryInterface $installedRepo)
    {
        uasort($versions, 'version_compare');
        $versions = array_keys(array_reverse($versions));

        // highlight installed version
        if ($installedRepo->hasPackage($package)) {
            $installedVersion = $package->getPrettyVersion();
            $key = array_search($installedVersion, $versions);
            if (false !== $key) {
                $versions[$key] = '<info>* ' . $installedVersion . '</info>';
            }
        }

        $versions = implode(', ', $versions);

        $this->getIO()->write('<info>versions</info> : ' . $versions);
    }

    /**
     * print link objects
     *
     * @param CompletePackageInterface $package
     * @param string                   $linkType
     * @param string                   $title
     */
    protected function printLinks(CompletePackageInterface $package, $linkType, $title = null)
    {
        $title = $title ?: $linkType;
        $io = $this->getIO();
        if ($links = $package->{'get'.ucfirst($linkType)}()) {
            $io->write("\n<info>" . $title . "</info>");

            foreach ($links as $link) {
                $io->write($link->getTarget() . ' <comment>' . $link->getPrettyConstraint() . '</comment>');
            }
        }
    }

    /**
     * Prints the licenses of a package with metadata
     *
     * @param CompletePackageInterface $package
     */
    protected function printLicenses(CompletePackageInterface $package)
    {
        $spdxLicenses = new SpdxLicenses();

        $licenses = $package->getLicense();
        $io = $this->getIO();

        foreach ($licenses as $licenseId) {
            $license = $spdxLicenses->getLicenseByIdentifier($licenseId); // keys: 0 fullname, 1 osi, 2 url

            if (!$license) {
                $out = $licenseId;
            } else {
                // is license OSI approved?
                if ($license[1] === true) {
                    $out = sprintf('%s (%s) (OSI approved) %s', $license[0], $licenseId, $license[2]);
                } else {
                    $out = sprintf('%s (%s) %s', $license[0], $licenseId, $license[2]);
                }
            }

            $io->write('<info>license</info>  : ' . $out);
        }
    }

    /**
     * Init styles for tree
     *
     * @param OutputInterface $output
     */
    protected function initStyles(OutputInterface $output)
    {
        $this->colors = array(
            'green',
            'yellow',
            'cyan',
            'magenta',
            'blue',
        );

        foreach ($this->colors as $color) {
            $style = new OutputFormatterStyle($color);
            $output->getFormatter()->setStyle($color, $style);
        }
    }

    /**
     * Display the tree
     *
     * @param PackageInterface|string $package
     * @param RepositoryInterface     $installedRepo
     * @param RepositoryInterface     $distantRepos
     */
    protected function displayPackageTree(PackageInterface $package, RepositoryInterface $installedRepo, RepositoryInterface $distantRepos)
    {
        $io = $this->getIO();
        $io->write(sprintf('<info>%s</info>', $package->getPrettyName()), false);
        $io->write(' ' . $package->getPrettyVersion(), false);
        $io->write(' ' . strtok($package->getDescription(), "\r\n"));

        if (is_object($package)) {
            $requires = $package->getRequires();
            $treeBar = '├';
            $j = 0;
            $total = count($requires);
            foreach ($requires as $requireName => $require) {
                $j++;
                if ($j == 0) {
                    $this->writeTreeLine($treeBar);
                }
                if ($j == $total) {
                    $treeBar = '└';
                }
                $level = 1;
                $color = $this->colors[$level];
                $info = sprintf('%s──<%s>%s</%s> %s', $treeBar, $color, $requireName, $color, $require->getPrettyConstraint());
                $this->writeTreeLine($info);

                $treeBar = str_replace('└', ' ', $treeBar);
                $packagesInTree = array($package->getName(), $requireName);

                $this->displayTree($requireName, $require, $installedRepo, $distantRepos, $packagesInTree, $treeBar, $level + 1);
            }
        }
    }

    /**
     * Display a package tree
     *
     * @param string                  $name
     * @param PackageInterface|string $package
     * @param RepositoryInterface     $installedRepo
     * @param RepositoryInterface     $distantRepos
     * @param array                   $packagesInTree
     * @param string                  $previousTreeBar
     * @param int                     $level
     */
    protected function displayTree($name, $package, RepositoryInterface $installedRepo, RepositoryInterface $distantRepos, array $packagesInTree, $previousTreeBar = '├', $level = 1)
    {
        $previousTreeBar = str_replace('├', '│', $previousTreeBar);
        list($package, $versions) = $this->getPackage($installedRepo, $distantRepos, $name, $package->getPrettyConstraint() === 'self.version' ? $package->getConstraint() : $package->getPrettyConstraint());
        if (is_object($package)) {
            $requires = $package->getRequires();
            $treeBar = $previousTreeBar . '  ├';
            $i = 0;
            $total = count($requires);
            foreach ($requires as $requireName => $require) {
                $currentTree = $packagesInTree;
                $i++;
                if ($i == $total) {
                    $treeBar = $previousTreeBar . '  └';
                }
                $colorIdent = $level % count($this->colors);
                $color = $this->colors[$colorIdent];

                $circularWarn = in_array($requireName, $currentTree) ? '(circular dependency aborted here)' : '';
                $info = rtrim(sprintf('%s──<%s>%s</%s> %s %s', $treeBar, $color, $requireName, $color, $require->getPrettyConstraint(), $circularWarn));
                $this->writeTreeLine($info);

                $treeBar = str_replace('└', ' ', $treeBar);
                if (!in_array($requireName, $currentTree)) {
                    $currentTree[] = $requireName;
                    $this->displayTree($requireName, $require, $installedRepo, $distantRepos, $currentTree, $treeBar, $level + 1);
                }
            }
        }
    }

    private function writeTreeLine($line)
    {
        $io = $this->getIO();
        if (!$io->isDecorated()) {
            $line = str_replace(array('└', '├', '──', '│'), array('`-', '|-', '-', '|'), $line);
        }

        $io->write($line);
    }

    /**
     * Given a package, this finds the latest package matching it
     *
     * @param  PackageInterface $package
     * @param  Composer         $composer
     * @param  string           $phpVersion
     * @param  bool             $minorOnly
     *
     * @return PackageInterface|null
     */
    private function findLatestPackage(PackageInterface $package, Composer $composer, $phpVersion, $minorOnly = false)
    {
        // find the latest version allowed in this pool
        $name = $package->getName();
        $versionSelector = new VersionSelector($this->getPool($composer));
        $stability = $composer->getPackage()->getMinimumStability();
        $flags = $composer->getPackage()->getStabilityFlags();
        if (isset($flags[$name])) {
            $stability = array_search($flags[$name], BasePackage::$stabilities, true);
        }

        $bestStability = $stability;
        if ($composer->getPackage()->getPreferStable()) {
            $bestStability = $package->getStability();
        }

        $targetVersion = null;
        if (0 === strpos($package->getVersion(), 'dev-')) {
            $targetVersion = $package->getVersion();
        }

        if ($targetVersion === null && $minorOnly) {
            $targetVersion = '^' . $package->getVersion();
        }

        return $versionSelector->findBestCandidate($name, $targetVersion, $phpVersion, $bestStability);
    }

    private function getPool(Composer $composer)
    {
        if (!$this->pool) {
            $this->pool = new Pool($composer->getPackage()->getMinimumStability(), $composer->getPackage()->getStabilityFlags());
            $this->pool->addRepository(new CompositeRepository($composer->getRepositoryManager()->getRepositories()));
        }

        return $this->pool;
    }
}