Fix #242 - add --no-cache option

bin/psalm

@@ -18,7 +18,7 @@ $options = getopt(
         'help', 'debug', 'config:', 'monochrome', 'show-info:', 'diff',
         'file:', 'self-check', 'update-docblocks', 'output-format:',
         'find-dead-code', 'init', 'find-references-to:', 'root:', 'threads:',
-        'report:', 'clear-cache',
+        'report:', 'clear-cache', 'no-cache',
     ]
 );
 
@@ -99,6 +99,9 @@ Options:
     --clear-cache
         Clears all cache files that Psalm uses
 
+    --no-cache
+        Runs Psalm without using cache
+
 HELP;
 
     exit;
@@ -319,9 +322,13 @@ $update_docblocks = isset($options['update-docblocks']);
 
 $threads = isset($options['threads']) ? (int)$options['threads'] : 1;
 
+$cache_provider = isset($options['no-cache'])
+    ? new Psalm\Provider\Cache\NoCacheProvider()
+    : new Psalm\Provider\CacheProvider();
+
 $project_checker = new ProjectChecker(
     new Psalm\Provider\FileProvider(),
-    new Psalm\Provider\CacheProvider(),
+    $cache_provider,
     $use_color,
     $show_info,
     $output_format,

src/Psalm/Provider/Cache/NoCacheProvider.php

@@ -0,0 +1,32 @@
+<?php
+namespace Psalm\Provider\Cache;
+
+use PhpParser;
+
+class NoCacheProvider extends \Psalm\Provider\CacheProvider
+{
+    /**
+     * @param  string   $file_path
+     * @param  string   $file_content_hash
+     * @param  string   $file_cache_key
+     * @param mixed $file_modified_time
+     *
+     * @return array<int, PhpParser\Node\Stmt>|null
+     */
+    public function loadStatementsFromCache($file_path, $file_modified_time, $file_content_hash, $file_cache_key)
+    {
+        return null;
+    }
+
+    /**
+     * @param  string                           $file_cache_key
+     * @param  string                           $file_content_hash
+     * @param  array<int, PhpParser\Node\Stmt>  $stmts
+     * @param  bool                             $touch_only
+     *
+     * @return void
+     */
+    public function saveStatementsToCache($file_cache_key, $file_content_hash, array $stmts, $touch_only)
+    {
+    }
+}