Add wuttapos serve command

b/c it apparently is just that easy..

setup.cfg

@@ -40,4 +40,5 @@ console_scripts =
 
 wuttapos.commands =
         open = wuttapos.commands:Open
+        serve = wuttapos.commands:Serve
         status = wuttapos.commands:Status

wuttapos/commands.py

@@ -24,6 +24,7 @@
 WuttaPOS commands
 """
 
+import logging
 import sys
 
 from rattail import commands
@@ -31,6 +32,9 @@ from rattail import commands
 from wuttapos import __version__
 
 
+log = logging.getLogger(__name__)
+
+
 def main(*args):
     """
     Main entry point for WuttaPOS command system
@@ -63,6 +67,26 @@ class Open(commands.Subcommand):
         run_app(self.config)
 
 
+class Serve(commands.Subcommand):
+    """
+    Run the POS app as a web service
+    """
+    name = 'serve'
+    description = __doc__.strip()
+
+    def run(self, args):
+        import flet as ft
+        from wuttapos.app import main
+
+        host = self.config.get('wuttapos', 'serve.host',
+                               default='0.0.0.0')
+        port = self.config.getint('wuttapos', 'serve.port',
+                                  default=8332)
+
+        log.info(f"will serve WuttaPOS on http://{host}:{port}")
+        ft.app(target=main, view=None, host=host, port=port)
+
+
 class Status(commands.Subcommand):
     """
     Show status of the POS lane