Move pipeline-dot build from cmdLineFwk to builder

This commit moves the pipeline-dot build logic from cmdLineFwk into
cli/script/build.py.
As part of this commit, a switch to using the same back-end display args
parser as --show pipeline-graph is also made.

Author: leeskelvin

python/lsst/ctrl/mpexec/cli/cmd/commands.py

@@ -124,10 +124,12 @@ def build(ctx: click.Context, **kwargs: Any) -> None:
     """
     kwargs = _collectActions(ctx, **kwargs)
     show = ShowInfo(kwargs.pop("show", []))
-    if kwargs.get("butler_config") is not None and {"pipeline-graph", "task-graph"}.isdisjoint(show.commands):
+    if kwargs.get("butler_config") is not None and (
+        {"pipeline-graph", "task-graph"}.isdisjoint(show.commands) and not kwargs.get("pipeline_dot")
+    ):
         raise click.ClickException(
             "--butler-config was provided but nothing uses it "
-            "(only --show pipeline-graph and --show task-graph do)."
+            "(only --show pipeline-graph, --show task-graph and --pipeline-dot do)."
         )
     script.build(**kwargs, show=show)
     _unhandledShow(show, "build")

python/lsst/ctrl/mpexec/cli/script/build.py

@@ -28,6 +28,7 @@
 from types import SimpleNamespace
 
 from lsst.daf.butler import Butler
+from lsst.pipe.base.pipeline_graph import visualization
 
 from ... import CmdLineFwk
 from ..utils import _PipelineAction
@@ -114,6 +115,15 @@ def build(  # type: ignore
     else:
         butler = None
 
+    if pipeline_dot:
+        with open(pipeline_dot, "w") as stream:
+            visualization.show_dot(
+                pipeline.to_graph(butler.registry if butler is not None else None),
+                stream,
+                dataset_types=True,
+                task_classes="full",
+            )
+
     show.show_pipeline_info(pipeline, butler=butler)
 
     return pipeline

python/lsst/ctrl/mpexec/cmdLineFwk.py

@@ -582,9 +582,6 @@ def makePipeline(self, args: SimpleNamespace) -> Pipeline:
         if args.save_pipeline:
             pipeline.write_to_uri(args.save_pipeline)
 
-        if args.pipeline_dot:
-            pipeline2dot(pipeline, args.pipeline_dot)
-
         return pipeline
 
     def makeGraph(self, pipeline: Pipeline, args: SimpleNamespace) -> QuantumGraph | None: