[enh] Better help for log list action

data/actionsmap/yunohost.yml

@@ -1614,8 +1614,8 @@ log:
             action_help: List logs
             api: GET /logs
             arguments:
-                categories:
+                category:
-                    help: Log categories to display (default operations)
+                    help: Log category to display (default operations), could be operation, history, package, system, access, service or app 
                     nargs: "*"
                 -l:
                     full: --limit

locales/en.json

@@ -206,6 +206,7 @@
     "ip6tables_unavailable": "You cannot play with ip6tables here. You are either in a container or your kernel does not support it",
     "iptables_unavailable": "You cannot play with iptables here. You are either in a container or your kernel does not support it",
     "log_corrupted_md_file": "The yaml metadata file associated with logs is corrupted : '{md_file}'",
+    "log_category_404": "The log category '{category}' does not exist",
     "log_does_exists": "There is not operation log with the name '{log}', use 'yunohost log list to see all available operation logs'",
     "log_operation_unit_unclosed_properly": "Operation unit has not been closed properly",
     "log_app_removelist": "Remove an application list",

src/yunohost/log.py

@@ -46,7 +46,7 @@ RELATED_CATEGORIES = ['app', 'domain', 'service', 'user']
 
 logger = getActionLogger('yunohost.log')
 
-def log_list(categories=[], limit=None):
+def log_list(category=[], limit=None):
     """
     List available logs
 
@@ -54,6 +54,9 @@ def log_list(categories=[], limit=None):
         limit -- Maximum number of logs
     """
 
+    categories = category
+
+    # In cli we just display `operation` logs by default
     if not categories:
         is_api = msettings.get('interface') == 'api'
         categories = ["operation"] if not is_api else CATEGORIES
@@ -64,6 +67,8 @@ def log_list(categories=[], limit=None):
 
         category_path = os.path.join(CATEGORIES_PATH, category)
         if not os.path.exists(category_path):
+            logger.warning(m18n.n('log_category_404', category=category))
+
             continue
 
         logs = filter(lambda x: x.endswith(METADATA_FILE_EXT), os.listdir(category_path))