[click_helper] Added AssetCommand and AssetInfo clases

These classes will allow to more cleanly provide asset
information through the chain of commands.

beat/cmdline/click_helper.py

@@ -79,3 +79,34 @@ class MutuallyExclusiveOption(click.Option):
             )
 
         return super().handle_parse_result(ctx, opts, args)
+
+
+class AssetInfo:
+    """ Information needed by the command to properly call local and remote
+        commands
+    """
+
+    def __init__(
+        self, asset_type=None, diff_fields=None, push_fields=None, get_dependencies=None
+    ):
+        self.asset_type = asset_type
+        self.diff_fields = diff_fields
+        self.push_fields = push_fields
+        self.get_dependencies = get_dependencies
+
+    def __repr__(self):
+        return "{}\n{}\n{}\n{}".format(
+            self.asset_type, self.diff_fields, self.push_fields, self.get_dependencies
+        )
+
+
+class AssetCommand(click.Command):
+    """ Custom click command that will update the context with asset information
+        related to the command called.
+    """
+
+    asset_info = AssetInfo()
+
+    def invoke(self, ctx):
+        ctx.meta["asset_info"] = self.asset_info
+        return super().invoke(ctx)