add downgrade support

Author: IonBazan

src/Formatter/AbstractFormatter.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace IonBazan\ComposerDiff\Formatter;
+
+use Composer\DependencyResolver\Operation\UpdateOperation;
+use Composer\Semver\Semver;
+use Composer\Semver\VersionParser;
+
+abstract class AbstractFormatter implements Formatter
+{
+    protected static function isUpgrade(UpdateOperation $operation)
+    {
+        $versionParser = new VersionParser();
+        $normalizedFrom = $versionParser->normalize($operation->getInitialPackage()->getFullPrettyVersion());
+        $normalizedTo = $versionParser->normalize($operation->getTargetPackage()->getFullPrettyVersion());
+
+        $sorted = Semver::sort(array($normalizedTo, $normalizedFrom));
+
+        return $sorted[0] === $normalizedFrom;
+    }
+}

src/Formatter/MarkdownListFormatter.php

@@ -8,7 +8,7 @@
 use Composer\DependencyResolver\Operation\UpdateOperation;
 use Symfony\Component\Console\Output\OutputInterface;
 
-class MarkdownListFormatter implements Formatter
+class MarkdownListFormatter extends AbstractFormatter
 {
     /**
      * @var OutputInterface
@@ -55,7 +55,8 @@ private function getRow(OperationInterface $operation)
 
         if ($operation instanceof UpdateOperation) {
             return sprintf(
-                ' - Update %s (%s => %s)',
+                ' - %s %s (%s => %s)',
+                self::isUpgrade($operation) ? 'Upgrade' : 'Downgrade',
                 $operation->getInitialPackage()->getName(),
                 $operation->getInitialPackage()->getFullPrettyVersion(),
                 $operation->getTargetPackage()->getFullPrettyVersion()
@@ -64,7 +65,7 @@ private function getRow(OperationInterface $operation)
 
         if ($operation instanceof UninstallOperation) {
             return sprintf(
-                ' - Remove %s (%s)',
+                ' - Uninstall %s (%s)',
                 $operation->getPackage()->getName(),
                 $operation->getPackage()->getFullPrettyVersion()
             );

src/Formatter/MarkdownTableFormatter.php

@@ -9,7 +9,7 @@
 use IonBazan\ComposerDiff\Formatter\Helper\MarkdownTable;
 use Symfony\Component\Console\Output\OutputInterface;
 
-class MarkdownTableFormatter implements Formatter
+class MarkdownTableFormatter extends AbstractFormatter
 {
     /**
      * @var OutputInterface

tests/Command/DiffCommandTest.php

@@ -58,8 +58,8 @@ public function outputDataProvider()
 =============
 
  - Install a/package-1 (1.0.0)
- - Update a/package-2 (1.0.0 => 1.2.0)
- - Remove a/package-3 (0.1.1)
+ - Upgrade a/package-2 (1.0.0 => 1.2.0)
+ - Uninstall a/package-3 (0.1.1)
 
 
 OUTPUT

tests/Formatter/FormatterTest.php

@@ -27,7 +27,8 @@ public function testItRendersTheListOfOperations()
         $formatter->render(array(
             new InstallOperation($this->getPackage('a/package-1', '1.0.0')),
             new UpdateOperation($this->getPackage('a/package-2', '1.0.0'), $this->getPackage('a/package-2', '1.2.0')),
-            new UninstallOperation($this->getPackage('a/package-3', '0.1.1')),
+            new UpdateOperation($this->getPackage('a/package-3', '2.0.0'), $this->getPackage('a/package-3', '1.1.1')),
+            new UninstallOperation($this->getPackage('a/package-4', '0.1.1')),
         ), 'Test');
         $this->assertSame($this->getSampleOutput(), $this->getDisplay($output));
     }

tests/Formatter/MarkdownListFormatterTest.php

@@ -14,8 +14,9 @@ protected function getSampleOutput()
 ====
 
  - Install a/package-1 (1.0.0)
- - Update a/package-2 (1.0.0 => 1.2.0)
- - Remove a/package-3 (0.1.1)
+ - Upgrade a/package-2 (1.0.0 => 1.2.0)
+ - Downgrade a/package-3 (2.0.0 => 1.1.1)
+ - Uninstall a/package-4 (0.1.1)
 
 
 OUTPUT;

tests/Formatter/MarkdownTableFormatterTest.php

@@ -14,7 +14,8 @@ protected function getSampleOutput()
 |-------------|-------|---------|
 | a/package-1 | New   | 1.0.0   |
 | a/package-2 | 1.0.0 | 1.2.0   |
-| a/package-3 | 0.1.1 | Removed |
+| a/package-3 | 2.0.0 | 1.1.1   |
+| a/package-4 | 0.1.1 | Removed |
 
 
 OUTPUT;