Add compact mode, toggle with 'c'

src/Settings.php

@@ -6,18 +6,22 @@ class Settings
 {
     public static bool $editorQuotedKeys = false;
 
+    public static bool $compactGroups = false;
+
     public static function load(string $filename): void
     {
         if (file_exists($filename) && is_readable($filename)) {
             $data = json_decode(file_get_contents($filename));
             self::$editorQuotedKeys = $data->editorQuotedKeys ?? false;
+            self::$compactGroups = $data->compactGroups ?? false;
         }
     }
 
     public static function save(string $filename): void
     {
         $data = json_encode([
-            'editorQuotedKeys' => self::$editorQuotedKeys
+            'editorQuotedKeys' => self::$editorQuotedKeys,
+            'compactGroups' => self::$compactGroups,
         ], JSON_UNESCAPED_SLASHES|JSON_PRETTY_PRINT)."\n";
         @file_put_contents($filename, $data);
     }
@@ -27,6 +31,8 @@ class Settings
         switch ($key) {
             case 'editorQuotedKeys':
                 self::$editorQuotedKeys = (bool)$value; break;
+            case 'compactGroups':
+                self::$compactGroups = (bool)$value; break;
         }
     }
 }