use version parser in vcs downloader

src/Composer/Downloader/GitDownloader.php

@@ -23,7 +23,7 @@ use Composer\Config;
 /**
  * @author Jordi Boggiano <j.boggiano@seld.be>
  */
-class GitDownloader extends VcsDownloader implements DvcsDownloaderInterface, VcsCapableDownloaderInterface
+class GitDownloader extends VcsDownloader implements DvcsDownloaderInterface
 {
     private $hasStashedChanges = false;
     private $hasDiscardedChanges = false;
@@ -196,25 +196,6 @@ class GitDownloader extends VcsDownloader implements DvcsDownloaderInterface, Vc
         return $unpushedChanges;
     }
 
-    /**
-     * {@inheritDoc}
-     */
-    public function getVcsReference(PackageInterface $package, $path)
-    {
-        if (!$this->hasMetadataRepository($path)) {
-            return;
-        }
-
-        GitUtil::cleanEnv();
-
-        $command = 'git log --pretty="%H" -n1 HEAD';
-        if (0 !== $this->process->execute($command, $output, $path)) {
-            throw new \RuntimeException('Failed to execute ' . $command . "\n\n" . $this->process->getErrorOutput());
-        }
-
-        return trim($output) ?: null;
-    }
-
     /**
      * {@inheritDoc}
      */

src/Composer/Downloader/HgDownloader.php

@@ -77,23 +77,6 @@ class HgDownloader extends VcsDownloader
         return trim($output) ?: null;
     }
 
-    /**
-     * {@inheritDoc}
-     */
-    public function getVcsReference(PackageInterface $package, $path)
-    {
-        if (!$this->hasMetadataRepository($path)) {
-            return;
-        }
-
-        $command = 'hg parent --template ' . escapeshellarg('{node}');
-        if (0 !== $this->process->execute($command, $output, $path)) {
-            throw new \RuntimeException('Failed to execute ' . $command . "\n\n" . $this->process->getErrorOutput());
-        }
-
-        return trim($output) ?: null;
-    }
-
     /**
      * {@inheritDoc}
      */

src/Composer/Downloader/SvnDownloader.php

@@ -81,24 +81,6 @@ class SvnDownloader extends VcsDownloader
         return preg_match('{^ *[^X ] +}m', $output) ? $output : null;
     }
 
-    /**
-     * {@inheritDoc}
-     */
-    public function getVcsReference(PackageInterface $package, $path)
-    {
-        if (!$this->hasMetadataRepository($path)) {
-            return;
-        }
-
-        SvnUtil::cleanEnv();
-
-        if (0 !== $this->process->execute('svnversion', $output, $path)) {
-            throw new \RuntimeException('Failed to execute ' . $command . "\n\n" . $this->process->getErrorOutput());
-        }
-
-        return trim($output) ?: null;
-    }
-
     /**
      * Execute an SVN command and try to fix up the process with credentials
      * if necessary.

src/Composer/Downloader/VcsDownloader.php

@@ -13,7 +13,10 @@
 namespace Composer\Downloader;
 
 use Composer\Config;
+use Composer\Package\Dumper\ArrayDumper;
 use Composer\Package\PackageInterface;
+use Composer\Package\Version\VersionGuesser;
+use Composer\Package\Version\VersionParser;
 use Composer\Util\ProcessExecutor;
 use Composer\IO\IOInterface;
 use Composer\Util\Filesystem;
@@ -21,7 +24,7 @@ use Composer\Util\Filesystem;
 /**
  * @author Jordi Boggiano <j.boggiano@seld.be>
  */
-abstract class VcsDownloader implements DownloaderInterface, ChangeReportInterface
+abstract class VcsDownloader implements DownloaderInterface, ChangeReportInterface, VcsCapableDownloaderInterface
 {
     /** @var IOInterface */
     protected $io;
@@ -193,6 +196,21 @@ abstract class VcsDownloader implements DownloaderInterface, ChangeReportInterfa
         return $this;
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function getVcsReference(PackageInterface $package, $path)
+    {
+        $parser = new VersionParser;
+        $guesser = new VersionGuesser($this->config, $this->process, $parser);
+        $dumper = new ArrayDumper;
+
+        $packageConfig = $dumper->dump($package);
+        if ($packageVersion = $guesser->guessVersion($packageConfig, $path)) {
+            return $packageVersion['commit'];
+        }
+    }
+
     /**
      * Prompt the user to check if changes should be stashed/removed or the operation aborted
      *