Further flesh out xenu-nntp-group

bin/xenu-nntp-group

@@ -1,5 +1,6 @@
 #! /usr/bin/env python3
 
+import sys
 import argparse
 import datetime
 
@@ -7,22 +8,23 @@ from xenu_nntp.config    import Config
 from xenu_nntp.db        import Database
 from xenu_nntp.newsgroup import Newsgroup
 
-parser = argparse.ArgumentParser(description='Create new account')
-parser.add_argument('--config-file', '-f', type=str,                help='Specify a configuration file location')
+def create(db: Database, args: list[str]):
+    parser = argparse.ArgumentParser(
+        description = 'Create new newsgroup',
+        prog        = '%s create' % sys.argv[0]
+    )
+
     parser.add_argument('--created-on',  type=str,                help='Specify creation date of newsgroup')
     parser.add_argument('--created-by',  type=str, required=True, help='Print messages when importing files and messages')
     parser.add_argument('--description', type=str, required=True, help='Newsgroup topic summary')
     parser.add_argument('--writable',    action='store_true',     help='Specify whether group is writable')
     parser.add_argument('name',          type=str,                help='Name of newsgroup to create')
 
-args = parser.parse_args()
+    args = parser.parse_args(args)
 
     if args.created_on is None:
         args.created_on = datetime.datetime.now(datetime.UTC).isoformat()
 
-config = Config.load(args.config_file)
-db     = Database.from_config(config)
-
     newsgroup = Newsgroup()
     newsgroup.name        = args.name
     newsgroup.description = args.description
@@ -33,3 +35,47 @@ newsgroup.writable    = args.writable or False
     db.execute("begin transaction")
     db.add(newsgroup)
     db.commit()
+
+    return 0
+
+def delete(db: Database, args: list[str]):
+    parser = argparse.ArgumentParser(
+        description = 'Delete newsgroup',
+        prog        = '%s delete' % sys.argv[0]
+    )
+
+    parser.add_argument('name', type=str, help='Name of newsgroup to delete')
+
+    args = parser.parse_args(args)
+
+    newsgroup = db.get(Newsgroup, {'name': args.name})
+
+    if newsgroup is None:
+        print(f"Unable to find newsgroup '{args.name}'", file=sys.stderr)
+        return 1
+
+    db.execute('delete from newsgroup_message where newsgroup_id = %s', (newsgroup.id,))
+    db.execute('delete from newsgroup where id = %s', (newsgroup.id,))
+
+    return 0
+
+COMMANDS = {
+    'create': create,
+    'delete': delete
+}
+
+parser = argparse.ArgumentParser(description='Manage newsgroups')
+parser.add_argument('--config-file', '-f', type=str, help='Specify a configuration file location')
+parser.add_argument('command',             type=str, help='Name of subcommand')
+parser.add_argument('args',                type=str, nargs='*')
+
+args = parser.parse_args()
+
+config = Config.load(args.config_file)
+db     = Database.from_config(config)
+
+if args.command not in COMMANDS:
+    print(f"Unknown command '{args.command}'", file=sys.stderr)
+    exit(1)
+
+exit(COMMANDS[args.command](db, args.args))