Support "copy from"/"copy to" in diff parser

src/Gitonomy/Git/Diff/File.php

@@ -38,6 +38,7 @@ public function __construct(
         private readonly ?string $oldIndex,
         private readonly ?string $newIndex,
         private readonly bool $isBinary,
+        private readonly bool $isCopy = false,
     ) {
     }
 
@@ -65,11 +66,21 @@ public function isModification(): bool
     /**
      * Indicates if it's a rename.
      *
-     * A rename can only occurs if it's a modification (not a creation or a deletion).
+     * A rename can only occurs if it's a modification (not a creation or a deletion), and is not a copy.
      */
     public function isRename(): bool
     {
-        return $this->isModification() && $this->oldName !== $this->newName;
+        return $this->isModification() && $this->oldName !== $this->newName && !$this->isCopy;
+    }
+
+    /**
+     * Indicates if it's a copy.
+     *
+     * Unlike a rename, the source file of a copy still exists after the change.
+     */
+    public function isCopy(): bool
+    {
+        return $this->isCopy;
     }
 
     /**
@@ -184,6 +195,7 @@ public function toArray(): array
             'old_index' => $this->oldIndex,
             'new_index' => $this->newIndex,
             'is_binary' => $this->isBinary,
+            'is_copy' => $this->isCopy,
             'changes' => array_map(static function (FileChange $change) {
                 return $change->toArray();
             }, $this->changes),
@@ -192,7 +204,7 @@ public function toArray(): array
 
     public static function fromArray(array $array): self
     {
-        $file = new self($array['old_name'], $array['new_name'], $array['old_mode'], $array['new_mode'], $array['old_index'], $array['new_index'], $array['is_binary']);
+        $file = new self($array['old_name'], $array['new_name'], $array['old_mode'], $array['new_mode'], $array['old_index'], $array['new_index'], $array['is_binary'], $array['is_copy'] ?? false);
 
         foreach ($array['changes'] as $change) {
             $file->addChange(FileChange::fromArray($change));

src/Gitonomy/Git/Parser/DiffParser.php

@@ -76,12 +76,16 @@ protected function doParse(): void
                 $this->consumeNewLine();
             }
 
+            $isCopy = false;
             if ($this->expects('similarity index ')) {
                 $this->consumeRegexp('/\d{1,3}%\n/');
-                $this->consume('rename from ');
+                $isCopy = $this->expects('copy from ');
+                if (!$isCopy) {
+                    $this->consume('rename from ');
+                }
                 $this->consumeTo("\n");
                 $this->consumeNewLine();
-                $this->consume('rename to ');
+                $this->consume($isCopy ? 'copy to ' : 'rename to ');
                 $this->consumeTo("\n");
                 $this->consumeNewLine();
             }
@@ -120,7 +124,7 @@ protected function doParse(): void
             $newIndex = null === $newIndex ? '' : $newIndex;
             $oldIndex = preg_match('/^0+$/', $oldIndex) ? null : $oldIndex;
             $newIndex = preg_match('/^0+$/', $newIndex) ? null : $newIndex;
-            $file = new File($oldName, $newName, $oldMode, $newMode, $oldIndex, $newIndex, $isBinary);
+            $file = new File($oldName, $newName, $oldMode, $newMode, $oldIndex, $newIndex, $isBinary, $isCopy);
 
             // 5. Diff
             while ($this->expects('@@ ')) {

tests/Gitonomy/Git/Tests/DiffTest.php

@@ -199,6 +199,55 @@ public function testModeChangeFileWithRaw(): void
         $this->assertSame('d1af4b23d0cc9313e5b2d3ef2fb9696c94afaa82', $secondFile->getNewIndex());
     }
 
+    public function testCopyFileWithoutRaw(): void
+    {
+        $this->expectUserDeprecationMessage('Using Diff::parse without raw information is deprecated. See https://github.com/gitonomy/gitlib/issues/227.');
+
+        $diff = Diff::parse(<<<'DIFF'
+            diff --git a/style.css b/common.css
+            similarity index 97%
+            copy from style.css
+            copy to common.css
+            index 1234567..89abcde 100644
+            --- a/style.css
+            +++ b/common.css
+            @@ -1,3 +1,4 @@
+             body {
+            +  color: red;
+             }
+
+            DIFF);
+        $firstFile = $diff->getFiles()[0];
+
+        $this->assertTrue($firstFile->isModification());
+        $this->assertTrue($firstFile->isCopy());
+        $this->assertFalse($firstFile->isRename());
+        $this->assertFalse($firstFile->isDeletion());
+        $this->assertFalse($firstFile->isCreation());
+        $this->assertSame('style.css', $firstFile->getOldName());
+        $this->assertSame('common.css', $firstFile->getNewName());
+        $this->assertSame(1, $firstFile->getAdditions());
+    }
+
+    public function testPureCopyFileWithoutRaw(): void
+    {
+        $this->expectUserDeprecationMessage('Using Diff::parse without raw information is deprecated. See https://github.com/gitonomy/gitlib/issues/227.');
+
+        $diff = Diff::parse(<<<'DIFF'
+            diff --git a/style.css b/common.css
+            similarity index 100%
+            copy from style.css
+            copy to common.css
+
+            DIFF);
+        $firstFile = $diff->getFiles()[0];
+
+        $this->assertTrue($firstFile->isCopy());
+        $this->assertFalse($firstFile->isRename());
+        $this->assertSame('style.css', $firstFile->getOldName());
+        $this->assertSame('common.css', $firstFile->getNewName());
+    }
+
     public function testThrowErrorOnBlobGetWithoutIndex(): void
     {
         $repository = self::createEmptyRepository();