Merge pull request #46 from nimah79/3.x

Add result caching

Author: nunomaduro

src/Analyser.php

@@ -21,12 +21,62 @@ public static function analyse(array $files, Closure $callback): void
     {
         $testCase = new TestCaseForTypeCoverage;
 
+        $cache = self::getCache();
+
+        $cacheIsModified = false;
         foreach ($files as $file) {
-            $errors = $testCase->gatherAnalyserErrors([$file]);
-            $ignored = $testCase->getIgnoredErrors();
+            $fileHash = sha1_file($file);
+            if (array_key_exists($file, $cache) && $cache[$file]['hash'] === $fileHash) {
+                $errors = $cache[$file]['errors'];
+                $ignored = $cache[$file]['ignored'];
+            } else {
+                $errors = $testCase->gatherAnalyserErrors([$file]);
+                $ignored = $testCase->getIgnoredErrors();
+                $cache[$file] = [
+                    'hash' => $fileHash,
+                    'errors' => $errors,
+                    'ignored' => $ignored,
+                ];
+                $cacheIsModified = true;
+            }
             $testCase->resetIgnoredErrors();
 
             $callback(Result::fromPHPStanErrors($file, $errors, $ignored));
         }
+        $cache = self::clearRemovedFilesFromCache($cache);
+        if ($cacheIsModified) {
+            self::saveCache($cache);
+        }
+    }
+
+    private static function getCache(): array
+    {
+        return is_file(self::getCacheFilepath())
+            ? include self::getCacheFilepath()
+            : [];
+    }
+
+    private static function saveCache(array $cache): void
+    {
+        file_put_contents(
+            self::getCacheFilepath(),
+            "<?php\nreturn ".var_export($cache, true).';',
+        );
+    }
+
+    private static function getCacheFilepath(): string
+    {
+        return sys_get_temp_dir().'/pest_plugin_type_coverage_cache_'.md5(__DIR__).'.php';
+    }
+
+    private static function clearRemovedFilesFromCache(array $cache): array
+    {
+        foreach (array_keys($cache) as $file) {
+            if (! is_file($file)) {
+                unset($cache[$file]);
+            }
+        }
+
+        return $cache;
     }
 }