polish code

Author: hect0x7

assets/option/option_test_api.yml

@@ -27,7 +27,7 @@ plugins:
         proxy_client_key: photo_concurrent_fetcher_proxy
         whitelist: [ api, ]
 
-    - plugin: advanced-retry
+    - plugin: advanced_retry
       kwargs:
         retry_config:
           retry_rounds: 3 # 一共对域名列表重试3轮

src/jmcomic/jm_plugin.py

@@ -1219,7 +1219,7 @@ def new_decide_dir(photo, ensure_exists=True) -> str:
 
 
 class AdvancedRetryPlugin(JmOptionPlugin):
-    plugin_key = 'advanced-retry'
+    plugin_key = 'advanced_retry'
 
     def __init__(self, option: JmOption):
         super().__init__(option)
@@ -1309,7 +1309,7 @@ def failed_count(client: JmcomicClient, domain: str) -> int:
 
 
 class DownloadCoverPlugin(JmOptionPlugin):
-    plugin_key = 'download-cover'
+    plugin_key = 'download_cover'
 
     def invoke(self,
                dir_rule: dict,
@@ -1324,4 +1324,7 @@ def invoke(self,
             None, None, None,
             dir_rule
         )
+        if self.option.download.cache and os.path.exists(save_path):
+            self.log(f'album-{album_id}的封面已存在，跳过下载: [{save_path}]', 'skip')
+            return
         downloader.client.download_album_cover(album_id, save_path, size)