add --allow-vendor and exclude vendor by default

README.md

@@ -119,3 +119,14 @@ Or in a json format:
     }
 }
 ```
+
+
+## Vendor file scanning
+
+This tool use case is to measure your code, not the 3rd party libraries. That's why it ignores `/vendor` directory by default to avoid huge false positives.
+
+If you want to measure vendor files too, use `--allow-vendor` option:
+
+```bash
+ vendor/bin/lines measure vendor/rector/rector --allow-vendor
+```

src/Console/Command/MeasureCommand.php

@@ -43,6 +43,7 @@ protected function configure(): void
 
         $this->addOption('json', null, InputOption::VALUE_NONE, 'Output in JSON format');
         $this->addOption('short', null, InputOption::VALUE_NONE, 'Print short metrics only');
+        $this->addOption('allow-vendor', null, InputOption::VALUE_NONE, 'Allow /vendor directory to be scanned');
     }
 
     /**
@@ -54,8 +55,9 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         $excludes = (array) $input->getOption('exclude');
         $isJson = (bool) $input->getOption('json');
         $isShort = (bool) $input->getOption('short');
+        $allowVendor = (bool) $input->getOption('allow-vendor');
 
-        $filePaths = $this->phpFilesFinder->findInDirectories($paths, $excludes);
+        $filePaths = $this->phpFilesFinder->findInDirectories($paths, $excludes, $allowVendor);
         if ($filePaths === []) {
             $output->writeln('<error>No files found to scan</error>');
             return Command::FAILURE;

src/Finder/PhpFilesFinder.php

@@ -14,7 +14,7 @@ final class PhpFilesFinder
      * @param string[] $exclude
      * @return string[]
      */
-    public function findInDirectories(array $paths, array $exclude = []): array
+    public function findInDirectories(array $paths, array $exclude = [], bool $allowVendor = false): array
     {
         Assert::allFileExists($paths);
 
@@ -38,6 +38,11 @@ public function findInDirectories(array $paths, array $exclude = []): array
                 ->notPath('tomasvotruba/lines')
                 ->exclude($exclude);
 
+            if ($allowVendor === false) {
+                // skip vendor directory, as we often need the full source code
+                $phpFilesFinder->notPath('vendor');
+            }
+
             foreach ($phpFilesFinder->getIterator() as $fileInfo) {
                 $filePaths[] = $fileInfo->getRealPath();
             }