add search subparser (#15)

src/ahriman/application/handlers/search.py

@@ -0,0 +1,58 @@
+#
+# Copyright (c) 2021 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+import argparse
+import aur  # type: ignore
+
+from typing import Callable, Type
+
+from ahriman.application.handlers.handler import Handler
+from ahriman.core.configuration import Configuration
+
+
+class Search(Handler):
+    """
+    packages search handler
+    """
+
+    @classmethod
+    def run(cls: Type[Handler], args: argparse.Namespace, architecture: str, configuration: Configuration) -> None:
+        """
+        callback for command line
+        :param args: command line args
+        :param architecture: repository architecture
+        :param configuration: configuration instance
+        """
+        search = " ".join(args.search)
+        packages = aur.search(search)
+
+        # it actually always should return string
+        # explicit cast to string just to avoid mypy warning for untyped library
+        comparator: Callable[[aur.Package], str] = lambda item: str(item.package_base)
+        for package in sorted(packages, key=comparator):
+            Search.log_fn(package)
+
+    @staticmethod
+    def log_fn(package: aur.Package) -> None:
+        """
+        log package information
+        :param package: package object as from AUR
+        """
+        print(f"=> {package.package_base} {package.version}")
+        print(f"   {package.description}")