Add pyserial into the equation

Pipfile

@@ -15,3 +15,5 @@ openvario-shell = {editable = true,path = "."}
 urwid = "*"
 typing-extensions = "*"
 importlib-metadata = "*"
+pyserial-asyncio = "*"
+pyserial = "*"

src/ovshell_core/ext.py

@@ -1,9 +1,9 @@
 from typing import Sequence
-import asyncio
 
 from ovshell import protocol
 
 from ovshell_core import settings
+from ovshell_core import serial
 
 
 class CoreExtension(protocol.Extension):
@@ -26,7 +26,10 @@ def list_settings(self) -> Sequence[protocol.Setting]:
         ]
 
     def start(self) -> None:
-        self.shell.processes.start(maintain_serial_devices())
+        devlookup = serial.SerialDeviceLookupImpl()
+        self.shell.processes.start(
+            serial.maintain_serial_devices(self.shell, devlookup)
+        )
 
     def _init_settings(self) -> None:
         config = self.shell.settings
@@ -38,8 +41,3 @@ def _apply_font(self) -> None:
         font = config.get("core.font", str)
         if font is not None:
             settings.apply_font(self.shell.os, font)
-
-
-async def maintain_serial_devices():
-    while True:
-        await asyncio.sleep(1)

src/ovshell_core/serial.py

@@ -0,0 +1,26 @@
+from typing import Sequence
+from typing_extensions import Protocol
+import asyncio
+
+from serial.tools import list_ports
+
+from ovshell import protocol
+
+
+class SerialDeviceLookup(Protocol):
+    def enumerate(self) -> Sequence[str]:
+        pass
+
+
+class SerialDeviceLookupImpl(SerialDeviceLookup):
+    def enumerate(self) -> Sequence[str]:
+        devs = list_ports.comports(include_links=False)
+        return [d.device for d in devs]
+
+
+async def maintain_serial_devices(
+    shell: protocol.OpenVarioShell, devlookup: SerialDeviceLookup
+) -> None:
+    while True:
+        devs = devlookup.enumerate()
+        await asyncio.sleep(1)