Add must-match-git-diff option

src/Configuration/Configuration.php

@@ -44,6 +44,11 @@ final class Configuration
      */
     private $areAnyPhpRectorsLoaded = false;
 
+    /**
+     * @var bool
+     */
+    private $mustMatchGitDiff = false;
+
     /**
      * Needs to run in the start of the life cycle, since the rest of workflow uses it.
      */
@@ -51,6 +56,7 @@ final class Configuration
     {
         $this->isDryRun = (bool) $input->getOption(Option::OPTION_DRY_RUN);
         $this->hideAutoloadErrors = (bool) $input->getOption(Option::HIDE_AUTOLOAD_ERRORS);
+        $this->mustMatchGitDiff = (bool) $input->getOption(Option::MUST_MATCH_GIT_DIFF);
         $this->showProgressBar = $this->canShowProgressBar($input);
 
         $this->setRule($input->getOption(Option::OPTION_RULE));
@@ -115,6 +121,11 @@ final class Configuration
         $this->areAnyPhpRectorsLoaded = $areAnyPhpRectorsLoaded;
     }
 
+    public function mustMatchGitDiff(): bool
+    {
+        return $this->mustMatchGitDiff;
+    }
+
     private function canShowProgressBar(InputInterface $input): bool
     {
         return $input->getOption(Option::OPTION_OUTPUT_FORMAT) !== JsonOutputFormatter::NAME;

src/Configuration/Option.php

@@ -65,4 +65,9 @@ final class Option
      * @var string
      */
     public const EXCLUDE_RECTORS_PARAMETER = 'exclude_rectors';
+
+    /**
+     * @var string
+     */
+    public const MUST_MATCH_GIT_DIFF = 'must-match-git-diff';
 }

src/Console/Command/ProcessCommand.php

@@ -148,6 +148,13 @@ final class ProcessCommand extends AbstractCommand
             'Hide autoload errors for the moment.'
         );
 
+        $this->addOption(
+            Option::MUST_MATCH_GIT_DIFF,
+            null,
+            InputOption::VALUE_NONE,
+            'Execute only on file matching the git diff.'
+        );
+
         $this->addOption(Option::OPTION_RULE, 'r', InputOption::VALUE_REQUIRED, 'Run only this single rule.');
 
         $availableOutputFormatters = $this->outputFormatterCollector->getNames();