Add initial CLI support

trovedb/cli/cli_common.py

@@ -0,0 +1,29 @@
+"""Common code for CLI subcommands"""
+
+import argparse
+import sys
+
+from trovedb import trove_factory, user_env, trove as tr
+
+
+def display_error(msg: str) -> None:
+    print(f"Error: {msg}", file=sys.stderr)
+
+
+class CliEnv:
+    """Environment for CLI subcommands"""
+    def __init__(self, verbose: bool = False):
+        self.verbose = verbose
+        self.local_trove = trove_factory.get_trove(user_env.TROVEBASE) if user_env.TROVEBASE else None
+
+    def checked_trove(self) -> tr.Trove:
+        if self.local_trove is None:
+            display_error("No local trove found")
+            raise SystemExit()
+        return self.local_trove
+
+def common_args(parser: argparse.ArgumentParser) -> None:
+    parser.add_argument('-v', '--verbose', action='store_true')
+
+def get_env(args: argparse.Namespace) -> CliEnv:
+    return CliEnv(args.verbose)