implement hardware scan command

mpf/commands/__init__.py

@@ -67,9 +67,18 @@ def execute(self):
 
         _module = import_module('mpf.commands.%s' % command)
 
+        if hasattr(_module, "subcommand") and _module.subcommand:
+            subcommand = self.argv.pop(1)
+        else:
+            subcommand = None
+
         machine_path, remaining_args = self.parse_args()
 
-        _module.Command(self.mpf_path, machine_path, remaining_args)
+        obj = _module.Command(self.mpf_path, machine_path, remaining_args)
+
+        if subcommand is not None:
+            method = getattr(obj, subcommand)
+            method()
 
     def parse_args(self):
         """Parse command line arguments."""

mpf/commands/hardware.py

@@ -0,0 +1,34 @@
+"""Perform hardware operations."""
+import os
+
+from mpf.core.machine import MachineController
+
+subcommand = True
+
+
+class Command(object):
+
+    """Performs hardware operations."""
+
+    def __init__(self, mpf_path, machine_path, args):
+        """Parse args."""
+        self.mpf_path = mpf_path
+        self.machine_path = machine_path
+        self.args = args
+        self.mpf = MachineController(self.mpf_path, self.machine_path,
+                                     {"bcp": False,
+                                      "no_load_cache": False,
+                                      "mpfconfigfile": os.path.join(mpf_path, "mpfconfig.yaml"),
+                                      "configfile": ["config"],
+                                      "create_config_cache": False,
+                                      "force_platform": False,
+                                      "text_ui": False
+                                      })
+        self.mpf.initialise_mpf()
+
+    def scan(self):
+        """Scan hardware."""
+        for name, platform in self.mpf.hardware_platforms.items():
+            print("{}:".format(name))
+            print(platform.get_info_string())
+            print("---------")