Fix handling of virtual packages when searching for packages or when looking up the preferred version (init & require command), refs #10489

src/Composer/Command/InitCommand.php

@@ -577,7 +577,21 @@ EOT
                 }
                 $matches = array_values($matches);
 
-                $exactMatch = null;
+                $exactMatch = false;
+                foreach ($matches as $match) {
+                    if ($match['name'] === $package) {
+                        $exactMatch = true;
+                        break;
+                    }
+                }
+
+                // no match, prompt which to pick
+                if (!$exactMatch) {
+                    $providers = $this->getRepos()->getProviders($package);
+                    if (count($providers) > 0) {
+                        array_unshift($matches, array('name' => $package, 'description' => ''));
+                    }
+
                     $choices = array();
                     foreach ($matches as $position => $foundPackage) {
                         $abandoned = '';
@@ -591,14 +605,8 @@ EOT
                         }
 
                         $choices[] = sprintf(' <info>%5s</info> %s %s', "[$position]", $foundPackage['name'], $abandoned);
-                    if ($foundPackage['name'] === $package) {
-                        $exactMatch = true;
-                        break;
-                    }
                     }
 
-                // no match, prompt which to pick
-                if (!$exactMatch) {
                     $io->writeError(array(
                         '',
                         sprintf('Found <info>%s</info> packages matching <info>%s</info>', count($matches), $package),
@@ -893,7 +901,8 @@ EOT
         $platformRequirementFilter = PlatformRequirementFilterFactory::fromBoolOrList($ignorePlatformReqs);
 
         // find the latest version allowed in this repo set
-        $versionSelector = new VersionSelector($this->getRepositorySet($input, $minimumStability), $platformRepo);
+        $repoSet = $this->getRepositorySet($input, $minimumStability);
+        $versionSelector = new VersionSelector($repoSet, $platformRepo);
         $effectiveMinimumStability = $minimumStability ?: $this->getMinimumStability($input);
 
         $package = $versionSelector->findBestCandidate($name, $requiredVersion, $preferredStability, $platformRequirementFilter);
@@ -905,6 +914,22 @@ EOT
                 return array($name, $requiredVersion ?: '*');
             }
 
+            // Check if it is a virtual package provided by others
+            $providers = $repoSet->getProviders($name);
+            if (count($providers) > 0) {
+                $constraint = '*';
+                if ($input->isInteractive()) {
+                    $constraint = $this->getIO()->askAndValidate('Package "<info>'.$name.'</info>" does not exist but is provided by '.count($providers).' packages. Which version constraint would you like to use? [<info>*</info>] ', function ($value) {
+                        $parser = new VersionParser();
+                        $parser->parseConstraints($value);
+
+                        return $value;
+                    }, 3, '*');
+                }
+
+                return array($name, $constraint);
+            }
+
             // Check whether the package requirements were the problem
             if (!($platformRequirementFilter instanceof IgnoreAllPlatformRequirementFilter) && ($candidate = $versionSelector->findBestCandidate($name, $requiredVersion, $preferredStability, PlatformRequirementFilterFactory::ignoreAll()))) {
                 throw new \InvalidArgumentException(sprintf(