Merge pull request #315 from softwarepub/feature/280-version-cmd

Add version subcommand

Author: nheeb

src/hermes/commands/__init__.py

@@ -9,6 +9,7 @@
 # flake8: noqa
 
 from hermes.commands.base import HermesHelpCommand
+from hermes.commands.base import HermesVersionCommand
 from hermes.commands.clean.base import HermesCleanCommand
 from hermes.commands.init.base import HermesInitCommand
 from hermes.commands.curate.base import HermesCurateCommand

src/hermes/commands/base.py

@@ -206,3 +206,23 @@ def __call__(self, args: argparse.Namespace) -> None:
     def load_settings(self, args: argparse.Namespace):
         """No settings are needed for the help command."""
         pass
+
+
+class HermesVersionSettings(BaseModel):
+    """Intentionally empty settings class for the version command."""
+    pass
+
+
+class HermesVersionCommand(HermesCommand):
+    """Show HERMES version and exit."""
+
+    command_name = "version"
+    settings_class = HermesVersionSettings
+
+    def load_settings(self, args: argparse.Namespace):
+        """Pass loading settings as not necessary for this command."""
+        pass
+
+    def __call__(self, args: argparse.Namespace) -> None:
+        self.log.info(metadata.version("hermes"))
+        self.parser.exit()

src/hermes/commands/cli.py

@@ -12,8 +12,9 @@
 import sys
 
 from hermes import logger
-from hermes.commands import HermesHelpCommand, HermesCleanCommand, HermesHarvestCommand, HermesProcessCommand, \
-                            HermesCurateCommand, HermesDepositCommand, HermesPostprocessCommand, HermesInitCommand
+from hermes.commands import (HermesHelpCommand, HermesVersionCommand, HermesCleanCommand,
+                             HermesHarvestCommand, HermesProcessCommand, HermesCurateCommand,
+                             HermesDepositCommand, HermesPostprocessCommand, HermesInitCommand)
 from hermes.commands.base import HermesCommand
 
 
@@ -36,6 +37,7 @@ def main() -> None:
 
     for command in (
             HermesHelpCommand(parser),
+            HermesVersionCommand(parser),
             HermesInitCommand(parser),
             HermesCleanCommand(parser),
             HermesHarvestCommand(parser),