split update --prefer-lowest and --prefer-stable

src/Composer/Command/UpdateCommand.php

@@ -47,7 +47,8 @@ class UpdateCommand extends Command
                 new InputOption('verbose', 'v|vv|vvv', InputOption::VALUE_NONE, 'Shows more details including new commits pulled in when updating packages.'),
                 new InputOption('optimize-autoloader', 'o', InputOption::VALUE_NONE, 'Optimize autoloader during autoloader dump.'),
                 new InputOption('ignore-platform-reqs', null, InputOption::VALUE_NONE, 'Ignore platform requirements (php & ext- packages).'),
-                new InputOption('prefer-lowest-stable', null, InputOption::VALUE_NONE, 'Forces all packages to their lowest stable version.'),
+                new InputOption('prefer-stable', null, InputOption::VALUE_NONE, 'Prefer stable versions of dependencies.'),
+                new InputOption('prefer-lowest', null, InputOption::VALUE_NONE, 'Prefer lowest versions of dependencies.'),
             ))
             ->setHelp(<<<EOT
 The <info>update</info> command reads the composer.json file from the
@@ -122,7 +123,8 @@ EOT
             ->setUpdateWhitelist($input->getOption('lock') ? array('lock') : $input->getArgument('packages'))
             ->setWhitelistDependencies($input->getOption('with-dependencies'))
             ->setIgnorePlatformRequirements($input->getOption('ignore-platform-reqs'))
-            ->setPreferLowestStable($input->getOption('prefer-lowest-stable'))
+            ->setPreferStable($input->getOption('prefer-stable'))
+            ->setPreferLowest($input->getOption('prefer-lowest'))
         ;
 
         if ($input->getOption('no-plugins')) {

src/Composer/Installer.php

@@ -107,7 +107,8 @@ class Installer
     protected $update = false;
     protected $runScripts = true;
     protected $ignorePlatformReqs = false;
-    protected $preferLowestStable = false;
+    protected $preferStable = false;
+    protected $preferLowest = false;
     /**
      * Array of package names/globs flagged for update
      *
@@ -702,11 +703,8 @@ class Installer
         // old lock file without prefer stable will return null
         // so in this case we use the composer.json info
         if (null === $preferStable) {
-            if ($this->preferLowestStable) {
-                $preferStable = $preferLowest = true;
-            } else {
-                $preferStable = $this->package->getPreferStable();
-            }
+            $preferStable = $this->preferStable || $this->package->getPreferStable();
+            $preferLowest = $this->preferLowest;
         }
 
         return new DefaultPolicy($preferStable, $preferLowest);
@@ -1251,14 +1249,27 @@ class Installer
     }
 
     /**
-     * Should packages be forced to their lowest stable version when updating?
+     * Should packages be prefered in a stable version when updating?
      *
-     * @param  boolean   $preferLowestStable
+     * @param  boolean   $preferStable
      * @return Installer
      */
-    public function setPreferLowestStable($preferLowestStable = true)
+    public function setPreferStable($preferStable = true)
     {
-        $this->preferLowestStable = (boolean) $preferLowestStable;
+        $this->preferStable = (boolean) $preferStable;
+
+        return $this;
+    }
+
+    /**
+     * Should packages be prefered in a lowest version when updating?
+     *
+     * @param  boolean   $preferLowest
+     * @return Installer
+     */
+    public function setPreferLowest($preferLowest = true)
+    {
+        $this->preferLowest = (boolean) $preferLowest;
 
         return $this;
     }

tests/Composer/Test/Fixtures/installer/update-prefer-lowest-stable.test

@@ -34,7 +34,7 @@ Updates packages to their lowest stable version
     { "name": "a/b", "version": "1.0.1" }
 ]
 --RUN--
-update --prefer-lowest-stable
+update --prefer-lowest --prefer-stable
 --EXPECT--
 Updating a/a (1.0.0-rc1) to a/a (1.0.1)
 Updating a/b (1.0.1) to a/b (1.0.0)

tests/Composer/Test/InstallerTest.php

@@ -217,7 +217,8 @@ class InstallerTest extends TestCase
                 ->setDryRun($input->getOption('dry-run'))
                 ->setUpdateWhitelist($input->getArgument('packages'))
                 ->setWhitelistDependencies($input->getOption('with-dependencies'))
-                ->setPreferLowestStable($input->getOption('prefer-lowest-stable'))
+                ->setPreferStable($input->getOption('prefer-stable'))
+                ->setPreferLowest($input->getOption('prefer-lowest'))
                 ->setIgnorePlatformRequirements($input->getOption('ignore-platform-reqs'));
 
             return $installer->run();