archive config - rewrite if prefix is invalid

lib/bot.php

@@ -573,6 +573,20 @@ function process_page($page)
                     true,
                     true
                 );
+            } elseif ($config->rewrite) {
+                $logger->info("Updating config on " . $page . " at " . $config_block->start_position);
+
+                $newPageData = substr($pagedata, 0, $config_block->start_position);
+                $newPageData .= $config->toWiki();
+                $newPageData .= substr($pagedata, $config_block->start_position + $config_block->end_position);
+
+                $wpapi->edit(
+                    $page,
+                    $newPageData,
+                    'Updating config. (BOT)',
+                    true,
+                    true
+                );
             }
 
             $logger->info("Handling archive config on " . $page . ": " . $config->toWiki());

lib/config/ArchiveConfig.php

@@ -41,6 +41,7 @@ class ArchiveConfig
 
     // This is a flag which causes the config to be removed on the archiving run
     public bool $once = false;
+    public bool $rewrite = false;
 
     // Internal flag
     public bool $is_valid = false;

lib/config/functions.php

@@ -202,6 +202,7 @@ function build_config_from_config_block(string $page, RawConfig $block)
         // so set it to the implicit value up-front.
         // Note: this has a side effect that toWiki will populate the value.
         $config->archiveprefix = $page . '/Archives/';
+        $config->rewrite = true;
     }
 
     if (array_key_exists('format', $options) && !empty($options['format'])) {
@@ -312,6 +313,7 @@ function build_config_from_config_block(string $page, RawConfig $block)
             $logger->error('Incorrect key for archive prefix; page=' . $page . ', prefix=' . $config->archiveprefix);
             $config->archiveprefix = $page . '/Archives/';
             $config->key = DefaultConfig::$key;
+            $config->rewrite = true;
         }
     }