Allow show command to work without a composer.json

src/Composer/Command/Command.php

@@ -25,8 +25,8 @@ abstract class Command extends BaseCommand
     /**
      * @return \Composer\Composer
      */
-    protected function getComposer()
+    protected function getComposer($required = true)
     {
-        return $this->getApplication()->getComposer();
+        return $this->getApplication()->getComposer($required);
     }
 }

src/Composer/Command/ShowCommand.php

@@ -17,6 +17,9 @@ use Composer\Package\PackageInterface;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Output\OutputInterface;
+use Composer\Repository\CompositeRepository;
+use Composer\Repository\PlatformRepository;
+use Composer\Repository\ComposerRepository;
 
 /**
  * @author Robert Schönthal <seroscho@googlemail.com>
@@ -44,13 +47,22 @@ EOT
 
     protected function execute(InputInterface $input, OutputInterface $output)
     {
-        $composer = $this->getComposer();
-        $package = $this->getPackage($input, $output, $composer);
+        if ($composer = $this->getComposer(false)) {
+            $localRepo = $composer->getRepositoryManager()->getLocalRepository();
+            $installedRepo = new CompositeRepository(array($localRepo, new PlatformRepository()));
+            $repos = new CompositeRepository(array_merge(array($installedRepo), $composer->getRepositoryManager()->getRepositories()));
+        } else {
+            $output->writeln('No composer.json found in the current directory, showing packages from packagist.org');
+            $installedRepo = new PlatformRepository;
+            $repos = new CompositeRepository(array($installedRepo, new ComposerRepository(array('url' => 'http://packagist.org'))));
+        }
+
+        $package = $this->getPackage($input, $output, $installedRepo, $repos);
         if (!$package) {
             throw new \InvalidArgumentException('no package found');
         }
 
-        $this->printMeta($input, $output, $package, $composer);
+        $this->printMeta($input, $output, $package, $installedRepo, $repos);
         $this->printLinks($input, $output, $package, 'requires');
         $this->printLinks($input, $output, $package, 'recommends');
         $this->printLinks($input, $output, $package, 'replaces');
@@ -63,16 +75,15 @@ EOT
      * @return PackageInterface
      * @throws \InvalidArgumentException
      */
-    protected function getPackage(InputInterface $input, OutputInterface $output, Composer $composer)
+    protected function getPackage(InputInterface $input, OutputInterface $output, $installedRepo, $repos)
     {
         // we have a name and a version so we can use ::findPackage
         if ($input->getArgument('version')) {
-            return $composer->getRepositoryManager()->findPackage($input->getArgument('package'), $input->getArgument('version'));
+            return $repos->findPackage($input->getArgument('package'), $input->getArgument('version'));
         }
 
         // check if we have a local installation so we can grab the right package/version
-        $localRepo = $composer->getRepositoryManager()->getLocalRepository();
-        foreach ($localRepo->getPackages() as $package) {
+        foreach ($installedRepo->getPackages() as $package) {
             if ($package->getName() === $input->getArgument('package')) {
                 return $package;
             }
@@ -80,15 +91,9 @@ EOT
 
         // we only have a name, so search for the highest version of the given package
         $highestVersion = null;
-        $repos = array_merge(
-            array($composer->getRepositoryManager()->getLocalRepository()),
-            $composer->getRepositoryManager()->getRepositories()
-        );
-        foreach ($repos as $repository) {
-            foreach ($repository->findPackagesByName($input->getArgument('package')) as $package) {
-                if (null === $highestVersion || version_compare($package->getVersion(), $highestVersion->getVersion(), '>=')) {
-                    $highestVersion = $package;
-                }
+        foreach ($repos->findPackagesByName($input->getArgument('package')) as $package) {
+            if (null === $highestVersion || version_compare($package->getVersion(), $highestVersion->getVersion(), '>=')) {
+                $highestVersion = $package;
             }
         }
 
@@ -98,15 +103,15 @@ EOT
     /**
      * prints package meta data
      */
-    protected function printMeta(InputInterface $input, OutputInterface $output, PackageInterface $package, Composer $composer)
+    protected function printMeta(InputInterface $input, OutputInterface $output, PackageInterface $package, $installedRepo, $repos)
     {
         $output->writeln('<info>name</info>     : ' . $package->getPrettyName());
-        $this->printVersions($input, $output, $package, $composer);
+        $this->printVersions($input, $output, $package, $installedRepo, $repos);
         $output->writeln('<info>type</info>     : ' . $package->getType());
         $output->writeln('<info>names</info>    : ' . join(', ', $package->getNames()));
         $output->writeln('<info>source</info>   : ' . sprintf('[%s] <comment>%s</comment> %s', $package->getSourceType(), $package->getSourceUrl(), $package->getSourceReference()));
         $output->writeln('<info>dist</info>     : ' . sprintf('[%s] <comment>%s</comment> %s', $package->getDistType(), $package->getDistUrl(), $package->getDistReference()));
-        $output->writeln('<info>licence</info>  : ' . join(', ', $package->getLicense()));
+        $output->writeln('<info>license</info>  : ' . join(', ', $package->getLicense()));
 
         if ($package->getAutoload()) {
             $output->writeln("\n<info>autoload</info>");
@@ -123,7 +128,7 @@ EOT
     /**
      * prints all available versions of this package and highlights the installed one if any
      */
-    protected function printVersions(InputInterface $input, OutputInterface $output, PackageInterface $package, Composer $composer)
+    protected function printVersions(InputInterface $input, OutputInterface $output, PackageInterface $package, $installedRepo, $repos)
     {
         if ($input->getArgument('version')) {
             $output->writeln('<info>version</info>  : ' . $package->getPrettyVersion());
@@ -132,16 +137,14 @@ EOT
 
         $versions = array();
 
-        foreach ($composer->getRepositoryManager()->getRepositories() as $repository) {
-            foreach ($repository->findPackagesByName($package->getName()) as $version) {
-                $versions[] = $version->getPrettyVersion();
-            }
+        foreach ($repos->findPackagesByName($package->getName()) as $version) {
+            $versions[] = $version->getPrettyVersion();
         }
 
         $versions = join(', ', $versions);
 
         // highlight installed version
-        if ($composer->getRepositoryManager()->getLocalRepository()->hasPackage($package)) {
+        if ($installedRepo->hasPackage($package)) {
             $versions = str_replace($package->getPrettyVersion(), '<info>* ' . $package->getPrettyVersion() . '</info>', $versions);
         }
 

src/Composer/Console/Application.php

@@ -71,14 +71,18 @@ class Application extends BaseApplication
     /**
      * @return Composer
      */
-    public function getComposer()
+    public function getComposer($required = true)
     {
         if (null === $this->composer) {
             try {
                 $this->composer = Factory::create($this->io);
             } catch (\InvalidArgumentException $e) {
-                $this->io->write($e->getMessage());
-                exit(1);
+                if ($required) {
+                    $this->io->write($e->getMessage());
+                    exit(1);
+                }
+
+                return;
             }
         }