--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libervia/cli/cmd_application.py	Fri Jun 02 14:54:26 2023 +0200
@@ -0,0 +1,191 @@
+#!/usr/bin/env python3
+
+# Libervia CLI
+# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from . import base
+from libervia.backend.core.i18n import _
+from libervia.backend.tools.common import data_format
+from libervia.cli.constants import Const as C
+
+__commands__ = ["Application"]
+
+
+class List(base.CommandBase):
+    """List available applications"""
+
+    def __init__(self, host):
+        super(List, self).__init__(
+            host, "list", use_profile=False, use_output=C.OUTPUT_LIST,
+            help=_("list available applications")
+        )
+
+    def add_parser_options(self):
+        # FIXME: "extend" would be better here, but it's only available from Python 3.8+
+        #   so we use "append" until minimum version of Python is raised.
+        self.parser.add_argument(
+            "-f",
+            "--filter",
+            dest="filters",
+            action="append",
+            choices=["available", "running"],
+            help=_("show applications with this status"),
+        )
+
+    async def start(self):
+
+        # FIXME: this is only needed because we can't use "extend" in
+        #   add_parser_options, see note there
+        if self.args.filters:
+            self.args.filters = list(set(self.args.filters))
+        else:
+            self.args.filters = ['available']
+
+        try:
+            found_apps = await self.host.bridge.applications_list(self.args.filters)
+        except Exception as e:
+            self.disp(f"can't get applications list: {e}", error=True)
+            self.host.quit(C.EXIT_BRIDGE_ERRBACK)
+        else:
+            await self.output(found_apps)
+            self.host.quit()
+
+
+class Start(base.CommandBase):
+    """Start an application"""
+
+    def __init__(self, host):
+        super(Start, self).__init__(
+            host, "start", use_profile=False, help=_("start an application")
+        )
+
+    def add_parser_options(self):
+        self.parser.add_argument(
+            "name",
+            help=_("name of the application to start"),
+        )
+
+    async def start(self):
+        try:
+            await self.host.bridge.application_start(
+                self.args.name,
+                "",
+            )
+        except Exception as e:
+            self.disp(f"can't start {self.args.name}: {e}", error=True)
+            self.host.quit(C.EXIT_BRIDGE_ERRBACK)
+        else:
+            self.host.quit()
+
+
+class Stop(base.CommandBase):
+
+    def __init__(self, host):
+        super(Stop, self).__init__(
+            host, "stop", use_profile=False, help=_("stop a running application")
+        )
+
+    def add_parser_options(self):
+        id_group = self.parser.add_mutually_exclusive_group(required=True)
+        id_group.add_argument(
+            "name",
+            nargs="?",
+            help=_("name of the application to stop"),
+        )
+        id_group.add_argument(
+            "-i",
+            "--id",
+            help=_("identifier of the instance to stop"),
+        )
+
+    async def start(self):
+        try:
+            if self.args.name is not None:
+                args = [self.args.name, "name"]
+            else:
+                args = [self.args.id, "instance"]
+            await self.host.bridge.application_stop(
+                *args,
+                "",
+            )
+        except Exception as e:
+            if self.args.name is not None:
+                self.disp(
+                    f"can't stop application {self.args.name!r}: {e}", error=True)
+            else:
+                self.disp(
+                    f"can't stop application instance with id {self.args.id!r}: {e}",
+                    error=True)
+            self.host.quit(C.EXIT_BRIDGE_ERRBACK)
+        else:
+            self.host.quit()
+
+
+class Exposed(base.CommandBase):
+
+    def __init__(self, host):
+        super(Exposed, self).__init__(
+            host, "exposed", use_profile=False, use_output=C.OUTPUT_DICT,
+            help=_("show data exposed by a running application")
+        )
+
+    def add_parser_options(self):
+        id_group = self.parser.add_mutually_exclusive_group(required=True)
+        id_group.add_argument(
+            "name",
+            nargs="?",
+            help=_("name of the application to check"),
+        )
+        id_group.add_argument(
+            "-i",
+            "--id",
+            help=_("identifier of the instance to check"),
+        )
+
+    async def start(self):
+        try:
+            if self.args.name is not None:
+                args = [self.args.name, "name"]
+            else:
+                args = [self.args.id, "instance"]
+            exposed_data_raw = await self.host.bridge.application_exposed_get(
+                *args,
+                "",
+            )
+        except Exception as e:
+            if self.args.name is not None:
+                self.disp(
+                    f"can't get values exposed from application {self.args.name!r}: {e}",
+                    error=True)
+            else:
+                self.disp(
+                    f"can't values exposed from  application instance with id {self.args.id!r}: {e}",
+                    error=True)
+            self.host.quit(C.EXIT_BRIDGE_ERRBACK)
+        else:
+            exposed_data = data_format.deserialise(exposed_data_raw)
+            await self.output(exposed_data)
+            self.host.quit()
+
+
+class Application(base.CommandBase):
+    subcommands = (List, Start, Stop, Exposed)
+
+    def __init__(self, host):
+        super(Application, self).__init__(
+            host, "application", use_profile=False, help=_("manage applications"),
+            aliases=['app'],
+        )