Fix Broker's handling of argument assignment

Ian noticed an issue had when specifying argument values in broker's cli,
specifically when using an {{=}} assignment instead of space-delimited.
This is likely an issue with the way click bundles arguments in its ctx.args.

broker/commands.py

@@ -229,14 +229,7 @@ def checkout(ctx, background, nick, count, args_file, provider_labels, **kwargs)
     if provider_labels:
         broker_args["provider_labels"] = parse_labels(provider_labels)
 
-    # if additional arguments were passed, include them in the broker args
-    # strip leading -- characters
-    broker_args.update(
-        {
-            (key[2:] if key.startswith("--") else key): val
-            for key, val in zip(ctx.args[::2], ctx.args[1::2])
-        }
-    )
+    broker_args.update(helpers.kwargs_from_click_ctx(ctx))
     if background:
         helpers.fork_broker()
     Broker(**broker_args).checkout()
@@ -375,14 +368,9 @@ def execute(ctx, background, nick, output_format, artifacts, args_file, provider
         broker_args["args_file"] = args_file
     if provider_labels:
         broker_args["provider_labels"] = parse_labels(provider_labels)
-    # if additional arguments were passed, include them in the broker args
-    # strip leading -- characters
-    broker_args.update(
-        {
-            (key[2:] if key.startswith("--") else key): val
-            for key, val in zip(ctx.args[::2], ctx.args[1::2])
-        }
-    )
+
+    broker_args.update(helpers.kwargs_from_click_ctx(ctx))
+
     if background:
         helpers.fork_broker()
     result = Broker(**broker_args).execute()

broker/helpers.py

@@ -1,4 +1,5 @@
 """Miscellaneous helpers live here."""
+
 import collections
 from collections import UserDict, namedtuple
 from collections.abc import MutableMapping
@@ -267,6 +268,24 @@ def yaml_format(in_struct):
     return yaml.dump(in_struct, default_flow_style=False, sort_keys=False)
 
 
+def kwargs_from_click_ctx(ctx):
+    """Convert a Click context object to a dictionary of keyword arguments."""
+    # if users use `=` to note arg=value assignment, then we need to split it
+    _args = []
+    for arg in ctx.args:
+        if "=" in arg:
+            _args.extend(arg.split("="))
+        else:
+            _args.append(arg)
+    ctx.args = _args
+    # if additional arguments were passed, include them in the broker args
+    # strip leading -- characters
+    return {
+        (key[2:] if key.startswith("--") else key): val
+        for key, val in zip(ctx.args[::2], ctx.args[1::2])
+    }
+
+
 class Emitter:
     """Class that provides a simple interface to emit messages to a json-formatted file.
 

tests/test_helpers.py

@@ -163,3 +163,12 @@ def test_dict_from_paths_nested():
     paths = {"person_name": "person/name", "person_zip": "person/address/zip"}
     result = helpers.dict_from_paths(source_dict, paths)
     assert result == {"person_name": "John", "person_zip": "12345"}
+
+
+def test_kwargs_from_click_ctx():
+    """Test that we can extract kwargs from a mixed-style click context object"""
+    class ctx:
+        args = ["--arg1", "value1", "--arg2=value2", "--some-flag"]
+
+    kwargs = helpers.kwargs_from_click_ctx(ctx)
+    assert kwargs == {"arg1": "value1", "arg2": "value2"}