Convert trash plugin settings

Author: sirainen

data/settings.js

@@ -3406,25 +3406,27 @@ when it drops under the limit.`
 
 	/* trash plugin */
 
-	trash: {
+	trash_priority: {
 		plugin: 'trash',
-		values: setting_types.STRING,
+		values: setting_types.UINT,
 		text: `
-A text file that configures the plugin's behavior. This setting is required
-for the plugin to be active.
-
-\`\`\`
-trash = /etc/dovecot/dovecot-trash.conf.External
-\`\`\`
-
-The file uses the following format:
+If non-zero, enables the trash plugin for the mailbox with the specified
+priority. Mailboxes with smaller priority number are emptied before mailboxes
+with a larger priority number. If there are multiple mailboxes with the same
+priority, expunge the oldest mail from them first.
 
-\`\`\`
-<priority> <mailbox name>
-\`\`\`
+Example where Trash is emptied before Spam:
 
-Deletion begins with the mailbox that has the lowest priority number and
-proceeds from there.`
+\`\`\`[dovecot.conf]
+namespace inbox {
+  mailbox Trash {
+    trash_priority = 1
+  }
+  mailbox Spam {
+    trash_priority = 2
+  }
+}
+\`\`\``
 	},
 
 	/* virtual plugin */

docs/core/plugins/trash.md

@@ -6,7 +6,7 @@ title: trash
 # Trash Plugin (`trash`)
 
 Normally, a quota exceeded error is returned if saving/copying a message would
-bring the user over quota.  With the trash plug-in, the oldest messages are
+bring the user over quota.  With the trash plugin, the oldest messages are
 instead expunged from the specified mailboxes until the message can be
 saved.
 
@@ -31,20 +31,25 @@ mail_plugins {
   trash = yes
 }
 
-plugin {
-  trash = /etc/dovecot/dovecot-trash.conf.ext
-}
-```
-
-```[dovecot-trash.conf.ext]
-# Spam mailbox is emptied before Trash
-1 Spam
-# Trash mailbox is emptied before Sent
-2 Trash
-# If both Sent and "Sent Messages" mailboxes exist, the next oldest message
-# to be deleted is looked up from both of the mailboxes.
-3 Sent
-3 Sent Messages
+namespace inbox {
+  # Spam mailbox is emptied before Trash
+  mailbox Spam {
+    priority = 1
+  }
+
+  # Trash mailbox is emptied before Sent
+  mailbox Trash {
+    priority = 2
+  }
+
+  # If both Sent and "Sent Messages" mailboxes exist, the next oldest message
+  # to be deleted is looked up from both of the mailboxes.
+  mailbox Sent {
+    priority = 3
+  }
+  mailbox "Sent Messages" {
+    priority = 3
+  }
 ```
 :::