Merge remote-tracking branch 'weaverryan/require-version-select'

src/Composer/Command/CreateProjectCommand.php

@@ -21,6 +21,7 @@ use Composer\IO\IOInterface;
 use Composer\Package\BasePackage;
 use Composer\DependencyResolver\Pool;
 use Composer\DependencyResolver\Operation\InstallOperation;
+use Composer\Package\Version\VersionSelector;
 use Composer\Repository\ComposerRepository;
 use Composer\Repository\CompositeRepository;
 use Composer\Repository\FilesystemRepository;
@@ -242,7 +243,6 @@ EOT
         }
 
         $parser = new VersionParser();
-        $candidates = array();
         $requirements = $parser->parseNameVersionPairs(array($packageName));
         $name = strtolower($requirements[0]['name']);
         if (!$packageVersion && isset($requirements[0]['version'])) {
@@ -266,15 +266,11 @@ EOT
         $pool = new Pool($stability);
         $pool->addRepository($sourceRepo);
 
-        $constraint = $packageVersion ? $parser->parseConstraints($packageVersion) : null;
-        $candidates = $pool->whatProvides($name, $constraint);
-        foreach ($candidates as $key => $candidate) {
-            if ($candidate->getName() !== $name) {
-                unset($candidates[$key]);
-            }
-        }
+        // find the latest version if there are multiple
+        $versionSelector = new VersionSelector($pool);
+        $package = $versionSelector->findBestCandidate($name, $packageVersion);
 
-        if (!$candidates) {
+        if (!$package) {
             throw new \InvalidArgumentException("Could not find package $name" . ($packageVersion ? " with version $packageVersion." : " with stability $stability."));
         }
 
@@ -283,15 +279,6 @@ EOT
             $directory = getcwd() . DIRECTORY_SEPARATOR . array_pop($parts);
         }
 
-        // select highest version if we have many
-        $package = reset($candidates);
-        foreach ($candidates as $candidate) {
-            if (version_compare($package->getVersion(), $candidate->getVersion(), '<')) {
-                $package = $candidate;
-            }
-        }
-        unset($candidates);
-
         $io->write('<info>Installing ' . $package->getName() . ' (' . VersionParser::formatVersion($package, false) . ')</info>');
 
         if ($disablePlugins) {

src/Composer/Command/InitCommand.php

@@ -12,9 +12,11 @@
 
 namespace Composer\Command;
 
+use Composer\DependencyResolver\Pool;
 use Composer\Json\JsonFile;
 use Composer\Factory;
 use Composer\Package\BasePackage;
+use Composer\Package\Version\VersionSelector;
 use Composer\Repository\CompositeRepository;
 use Composer\Repository\PlatformRepository;
 use Composer\Package\Version\VersionParser;
@@ -32,6 +34,7 @@ class InitCommand extends Command
 {
     private $gitConfig;
     private $repos;
+    private $pool;
 
     public function parseAuthorString($author)
     {
@@ -284,9 +287,11 @@ EOT
 
     protected function findPackages($name)
     {
-        $packages = array();
+        return $this->getRepos()->search($name);
+    }
 
-        // init repos
+    protected function getRepos()
+    {
         if (!$this->repos) {
             $this->repos = new CompositeRepository(array_merge(
                 array(new PlatformRepository),
@@ -294,7 +299,17 @@ EOT
             ));
         }
 
-        return $this->repos->search($name);
+        return $this->repos;
+    }
+
+    protected function getPool()
+    {
+        if (!$this->pool) {
+            $this->pool = new Pool($this->getComposer()->getPackage()->getMinimumStability());
+            $this->pool->addRepository($this->getRepos());
+        }
+
+        return $this->pool;
     }
 
     protected function determineRequirements(InputInterface $input, OutputInterface $output, $requires = array())
@@ -306,15 +321,18 @@ EOT
             $requires = $this->normalizeRequirements($requires);
             $result = array();
 
-            foreach ($requires as $key => $requirement) {
-                if (!isset($requirement['version']) && $input->isInteractive()) {
-                    $question = $dialog->getQuestion('Please provide a version constraint for the '.$requirement['name'].' requirement');
-                    if ($constraint = $dialog->ask($output, $question)) {
-                        $requirement['version'] = $constraint;
-                    }
-                }
+            foreach ($requires as $requirement) {
                 if (!isset($requirement['version'])) {
-                    throw new \InvalidArgumentException('The requirement '.$requirement['name'].' must contain a version constraint');
+
+                    // determine the best version automatically
+                    $version = $this->findBestVersionForPackage($requirement['name']);
+                    $requirement['version'] = $version;
+
+                    $output->writeln(sprintf(
+                        'Using version <info>%s</info> for <info>%s</info>',
+                        $requirement['version'],
+                        $requirement['name']
+                    ));
                 }
 
                 $result[] = $requirement['name'] . ' ' . $requirement['version'];
@@ -369,7 +387,7 @@ EOT
                     $package = $dialog->askAndValidate($output, $dialog->getQuestion('Enter package # to add, or the complete package name if it is not listed', false, ':'), $validator, 3);
                 }
 
-                // no constraint yet, prompt user
+                // no constraint yet, determine the best version automatically
                 if (false !== $package && false === strpos($package, ' ')) {
                     $validator = function ($input) {
                         $input = trim($input);
@@ -377,9 +395,20 @@ EOT
                         return $input ?: false;
                     };
 
-                    $constraint = $dialog->askAndValidate($output, $dialog->getQuestion('Enter the version constraint to require', false, ':'), $validator, 3);
+                    $constraint = $dialog->askAndValidate(
+                        $output,
+                        $dialog->getQuestion('Enter the version constraint to require (or leave blank to use the latest version)', false, ':'),
+                        $validator,
+                        3)
+                    ;
                     if (false === $constraint) {
-                        continue;
+                        $constraint = $this->findBestVersionForPackage($package);
+
+                        $output->writeln(sprintf(
+                            'Using version <info>%s</info> for <info>%s</info>',
+                            $constraint,
+                            $package
+                        ));
                     }
 
                     $package .= ' '.$constraint;
@@ -504,4 +533,30 @@ EOT
 
         return false !== filter_var($email, FILTER_VALIDATE_EMAIL);
     }
+
+    /**
+     * Given a package name, this determines the best version to use in the require key.
+     *
+     * This returns a version with the ~ operator prefixed when possible.
+     *
+     * @param string $name
+     * @return string
+     * @throws \InvalidArgumentException
+     */
+    protected function findBestVersionForPackage($name)
+    {
+        // find the latest version allowed in this pool
+        $versionSelector = new VersionSelector($this->getPool());
+        $package = $versionSelector->findBestCandidate($name);
+
+        if (!$package) {
+            throw new \InvalidArgumentException(sprintf(
+                'Could not find package %s at any version for your minimum-stability (%s). Check the package spelling or your minimum-stability',
+                $name,
+                $this->getComposer()->getPackage()->getMinimumStability()
+            ));
+        }
+
+        return $versionSelector->findRecommendedRequireVersion($package);
+    }
 }

src/Composer/DependencyResolver/Pool.php

@@ -15,7 +15,6 @@ namespace Composer\DependencyResolver;
 use Composer\Package\BasePackage;
 use Composer\Package\AliasPackage;
 use Composer\Package\Version\VersionParser;
-use Composer\Package\Link;
 use Composer\Package\LinkConstraint\LinkConstraintInterface;
 use Composer\Package\LinkConstraint\VersionConstraint;
 use Composer\Package\LinkConstraint\EmptyConstraint;
@@ -25,6 +24,7 @@ use Composer\Repository\ComposerRepository;
 use Composer\Repository\InstalledRepositoryInterface;
 use Composer\Repository\StreamableRepositoryInterface;
 use Composer\Repository\PlatformRepository;
+use Composer\Package\PackageInterface;
 
 /**
  * A package pool contains repositories that provide packages.
@@ -232,7 +232,7 @@ class Pool
      *                                                packages must match or null to return all
      * @param  bool                    $mustMatchName Whether the name of returned packages
      *                                                must match the given name
-     * @return array                   A set of packages
+     * @return PackageInterface[]                    A set of packages
      */
     public function whatProvides($name, LinkConstraintInterface $constraint = null, $mustMatchName = false)
     {

src/Composer/Package/Version/VersionSelector.php

@@ -0,0 +1,113 @@
+<?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\Package\Version;
+
+use Composer\DependencyResolver\Pool;
+use Composer\Package\PackageInterface;
+
+/**
+ * Selects the best possible version for a package
+ *
+ * @author Ryan Weaver <ryan@knpuniversity.com>
+ */
+class VersionSelector
+{
+    private $pool;
+
+    private $parser;
+
+    public function __construct(Pool $pool)
+    {
+        $this->pool = $pool;
+    }
+
+    /**
+     * Given a package name and optional version, returns the latest PackageInterface
+     * that matches.
+     *
+     * @param string    $packageName
+     * @param string    $targetPackageVersion
+     * @return PackageInterface|bool
+     */
+    public function findBestCandidate($packageName, $targetPackageVersion = null)
+    {
+        $constraint = $targetPackageVersion ? $this->getParser()->parseConstraints($targetPackageVersion) : null;
+        $candidates = $this->pool->whatProvides($packageName, $constraint, true);
+
+        if (!$candidates) {
+            return false;
+        }
+
+        // select highest version if we have many
+        // logic is repeated in InitCommand
+        $package = reset($candidates);
+        foreach ($candidates as $candidate) {
+            if (version_compare($package->getVersion(), $candidate->getVersion(), '<')) {
+                $package = $candidate;
+            }
+        }
+
+        return $package;
+    }
+
+    /**
+     * Given a concrete version, this returns a ~ constraint (when possible)
+     * that should be used, for example, in composer.json.
+     *
+     * For example:
+     *  * 1.2.1         -> ~1.2
+     *  * 1.2           -> ~1.2
+     *  * v3.2.1        -> ~3.2
+     *  * 2.0-beta.1    -> ~2.0-beta.1
+     *  * dev-master    -> dev-master    (dev versions are untouched)
+     *
+     * @param PackageInterface $package
+     * @return string
+     */
+    public function findRecommendedRequireVersion(PackageInterface $package)
+    {
+        $version = $package->getPrettyVersion();
+        if (!$package->isDev()) {
+            // remove the v prefix if there is one
+            if (substr($version, 0, 1) == 'v') {
+                $version = substr($version, 1);
+            }
+
+            // for stable packages only, we try to transform 2.1.1 to 2.1
+            // this allows you to upgrade through minor versions
+            if ($package->getStability() == 'stable') {
+                $semanticVersionParts = explode('.', $version);
+                // check to see if we have a normal 1.2.6 semantic version
+                if (count($semanticVersionParts) == 3) {
+                    // remove the last part (i.e. the patch version number)
+                    unset($semanticVersionParts[2]);
+                    $version = implode('.', $semanticVersionParts);
+                }
+            }
+
+            // 2.1 -> ~2.1
+            $version = '~'.$version;
+        }
+
+        return $version;
+    }
+
+    private function getParser()
+    {
+        if ($this->parser === null) {
+            $this->parser = new VersionParser();
+        }
+
+        return $this->parser;
+    }
+}

tests/Composer/Test/Package/Version/VersionSelectorTest.php

@@ -0,0 +1,115 @@
+<?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\Test\Package\Version;
+
+use Composer\Package\Version\VersionSelector;
+
+class VersionSelectorTest extends \PHPUnit_Framework_TestCase
+{
+    // A) multiple versions, get the latest one
+    // B) targetPackageVersion will pass to pool
+    // C) No results, throw exception
+
+    public function testLatestVersionIsReturned()
+    {
+        $packageName = 'foobar';
+
+        $package1 = $this->createMockPackage('1.2.1');
+        $package2 = $this->createMockPackage('1.2.2');
+        $package3 = $this->createMockPackage('1.2.0');
+        $packages = array($package1, $package2, $package3);
+
+        $pool = $this->createMockPool();
+        $pool->expects($this->once())
+            ->method('whatProvides')
+            ->with($packageName, null, true)
+            ->will($this->returnValue($packages));
+
+        $versionSelector = new VersionSelector($pool);
+        $best = $versionSelector->findBestCandidate($packageName);
+
+        // 1.2.2 should be returned because it's the latest of the returned versions
+        $this->assertEquals($package2, $best, 'Latest version should be 1.2.2');
+    }
+
+    public function testFalseReturnedOnNoPackages()
+    {
+        $pool = $this->createMockPool();
+        $pool->expects($this->once())
+            ->method('whatProvides')
+            ->will($this->returnValue(array()));
+
+        $versionSelector = new VersionSelector($pool);
+        $best = $versionSelector->findBestCandidate('foobaz');
+        $this->assertFalse($best, 'No versions are available returns false');
+    }
+
+    /**
+     * @dataProvider getRecommendedRequireVersionPackages
+     */
+    public function testFindRecommendedRequireVersion($prettyVersion, $isDev, $stability, $expectedVersion)
+    {
+        $pool = $this->createMockPool();
+        $versionSelector = new VersionSelector($pool);
+
+        $package = $this->getMock('\Composer\Package\PackageInterface');
+        $package->expects($this->any())
+            ->method('getPrettyVersion')
+            ->will($this->returnValue($prettyVersion));
+        $package->expects($this->any())
+            ->method('isDev')
+            ->will($this->returnValue($isDev));
+        $package->expects($this->any())
+            ->method('getStability')
+            ->will($this->returnValue($stability));
+
+        $recommended = $versionSelector->findRecommendedRequireVersion($package);
+
+        // assert that the recommended version is what we expect
+        $this->assertEquals($expectedVersion, $recommended);
+    }
+
+    public function getRecommendedRequireVersionPackages()
+    {
+        return array(
+            // real version, is dev package, stability, expected recommendation
+            array('1.2.1', false, 'stable', '~1.2'),
+            array('1.2', false, 'stable', '~1.2'),
+            array('v1.2.1', false, 'stable', '~1.2'),
+            array('3.1.2-pl2', false, 'stable', '~3.1'),
+            array('3.1.2-patch', false, 'stable', '~3.1'),
+            // for non-stable versions, we add ~, but don't try the (1.2.1 -> 1.2) transformation
+            array('2.0-beta.1', false, 'beta', '~2.0-beta.1'),
+            array('3.1.2-alpha5', false, 'alpha', '~3.1.2-alpha5'),
+            array('3.0-RC2', false, 'RC', '~3.0-RC2'),
+            // dev packages are not touched at all
+            array('dev-master', true, 'dev', 'dev-master'),
+            array('3.1.2-dev', true, 'dev', '3.1.2-dev'),
+        );
+    }
+
+    private function createMockPackage($version)
+    {
+        $package = $this->getMock('\Composer\Package\PackageInterface');
+        $package->expects($this->any())
+            ->method('getVersion')
+            ->will($this->returnValue($version));
+
+        return $package;
+    }
+
+    private function createMockPool()
+    {
+        return $this->getMock('Composer\DependencyResolver\Pool', array(), array(), '', true);
+    }
+}