feat: Build cache for character listings

config/services.yaml

@@ -5,12 +5,15 @@
 # https://symfony.com/doc/current/best_practices.html#use-parameters-for-application-configuration
 parameters:
   app.charlist.basepath: '%kernel.project_dir%/data/lists'
+  app.var.basepath:      '%kernel.project_dir%/var'
 
 services:
     # default configuration for services in *this* file
     _defaults:
         autowire: true      # Automatically injects dependencies in your services.
         autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.
+        bind:
+          string $varBasepath: '%app.var.basepath%'
 
     # makes classes in src/ available to be used as services
     # this creates a service per class whose id is the fully-qualified class name

src/Controller/KanjiController.php

@@ -9,6 +9,7 @@ use App\Utils\Number;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Routing\Attribute\Route;
+use Symfony\Component\VarExporter\VarExporter;
 
 #[Route('/kanji', name: 'app_kanji_')]
 class KanjiController extends AbstractController
@@ -16,6 +17,7 @@ class KanjiController extends AbstractController
     function __construct(
         private AnkiService     $anki,
         private CharListService $charList,
+        private string          $varBasepath,
     ) {}
 
     public static function tmpl(string $path): string
@@ -26,6 +28,10 @@ class KanjiController extends AbstractController
     /** @return array<string, array<string, 0>> */
     private function getCharInfo(): array
     {
+        $cacheFile = "$this->varBasepath/charlist.php";
+
+        if (file_exists($cacheFile)) return require $cacheFile;
+
         $ret = [];
 
         $lists = [
@@ -59,6 +65,8 @@ class KanjiController extends AbstractController
             }
         }
 
+        file_put_contents($cacheFile, '<?php return ' . VarExporter::export($ret) . ';');
+
         return $ret;
     }