feat(indexers): add support for optional baseurl override (#551)

* feat(indexers): optional baseurl override

* feat(indexers): update baseUrl parsing

* refactor(indexers): BREAKING move parse to IRC struct

* Move Parse as part of IRC struct from Indexer
* Updated definitions
* Build torrentUrl in stages
* Use new url.JoinPath to build torrentUrl
* Update tests

* refactor(indexers): select option obj

* refactor(indexers): make backwards compatible

internal/indexer/definitions/enthralled.yaml

@@ -5,7 +5,7 @@ identifier: enthralled
 description: Enthralled (ENT) is a private torrent tracker for XXX
 language: en-us
 urls:
-  - https://enthralled.me
+  - https://enthralled.me/
 privacy: private
 protocol: torrent
 supports:
@@ -53,19 +53,19 @@ irc:
       label: NickServ Password
       help: NickServ password
 
-parse:
-  type: single
-  lines:
-    - test:
-        - "Some release - Size: 559.06 MiB - Uploader: anon - Tags: worship,other - https://www.enthralled.me/torrents.php?torrentid=0000"
-      pattern: '(.*) - Size: (.*) - Uploader: (.*) - Tags: (.*?) - (https://.*)/torrents.php\?torrentid=(.*)'
-      vars:
-        - torrentName
-        - torrentSize
-        - uploader
-        - tags
-        - baseUrl
-        - torrentId
+  parse:
+    type: single
+    lines:
+      - test:
+          - "Some release - Size: 559.06 MiB - Uploader: anon - Tags: worship,other - https://www.enthralled.me/torrents.php?torrentid=0000"
+        pattern: '(.*) - Size: (.+) - Uploader: (.+) - Tags: (.*?) - (https://.+\/)torrents.php\?torrentid=(\d+)'
+        vars:
+          - torrentName
+          - torrentSize
+          - uploader
+          - tags
+          - baseUrl
+          - torrentId
 
-  match:
-    torrenturl: "{{ .baseUrl }}/torrents.php?action=download&id={{ .torrentId }}&authkey={{ .authkey }}&torrent_pass={{ .torrent_pass }}"
+    match:
+      torrenturl: "/torrents.php?action=download&id={{ .torrentId }}&authkey={{ .authkey }}&torrent_pass={{ .torrent_pass }}"