Add DataGraphsITensorVisualizationBaseExt

Move the `visualize(::AbstractDataGraph, ...)` overload that previously
lived in ITensorNetworks.jl (where it was type piracy on a DataGraphs
type) into DataGraphs as a package extension keyed on
ITensorVisualizationBase. The method delegates to
`visualize(underlying_graph(graph), ...)`.

Bumps version to 0.4.1.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mtfishman

Project.toml

@@ -1,6 +1,6 @@
 name = "DataGraphs"
 uuid = "b5a273c3-7e6c-41f6-98bd-8d7f1525a36a"
-version = "0.4.0"
+version = "0.4.1"
 authors = ["Matthew Fishman <mfishman@flatironinstitute.org> and contributors"]
 
 [workspace]
@@ -14,14 +14,17 @@ SimpleTraits = "699a6c99-e7fa-54fc-8d76-47d257e15c1d"
 
 [weakdeps]
 GraphsFlows = "06909019-6f44-4949-96fc-b9d9aaa02889"
+ITensorVisualizationBase = "cd2553d2-8bef-4d93-8a38-c62f17d5ad23"
 
 [extensions]
 DataGraphsGraphsFlowsExt = "GraphsFlows"
+DataGraphsITensorVisualizationBaseExt = "ITensorVisualizationBase"
 
 [compat]
 Dictionaries = "0.4"
 Graphs = "1"
 GraphsFlows = "0.1.1"
+ITensorVisualizationBase = "0.1"
 NamedGraphs = "0.11"
 SimpleTraits = "0.9"
 julia = "1.7"

ext/DataGraphsITensorVisualizationBaseExt/DataGraphsITensorVisualizationBaseExt.jl

@@ -0,0 +1,12 @@
+module DataGraphsITensorVisualizationBaseExt
+
+using DataGraphs: AbstractDataGraph, underlying_graph
+using ITensorVisualizationBase: ITensorVisualizationBase
+
+function ITensorVisualizationBase.visualize(graph::AbstractDataGraph, args...; kwargs...)
+    return ITensorVisualizationBase.visualize(
+        underlying_graph(graph), args...; kwargs...
+    )
+end
+
+end

test/Project.toml

@@ -5,6 +5,7 @@ Dictionaries = "85a47980-9c8c-11e8-2b9f-f7ca1fa99fb4"
 Graphs = "86223c79-3864-5bf0-83f7-82e725a168b6"
 GraphsFlows = "06909019-6f44-4949-96fc-b9d9aaa02889"
 ITensorPkgSkeleton = "3d388ab1-018a-49f4-ae50-18094d5f71ea"
+ITensorVisualizationBase = "cd2553d2-8bef-4d93-8a38-c62f17d5ad23"
 NamedGraphs = "678767b0-92e7-4007-89e4-4527a8725b19"
 SafeTestsets = "1bc83da4-3b8d-516f-aca4-4fe02f6d838f"
 Suppressor = "fd094767-a336-5f1f-9728-57cf17d0bbfb"

test/test_itensorvisualizationbase_ext.jl

@@ -0,0 +1,12 @@
+@eval module $(gensym())
+using DataGraphs: AbstractDataGraph, DataGraph
+using ITensorVisualizationBase: ITensorVisualizationBase
+using NamedGraphs.NamedGraphGenerators: named_grid
+using Test: @test, @testset
+
+@testset "DataGraphsITensorVisualizationBaseExt" begin
+    g = DataGraph(named_grid((2, 2)))
+    @test hasmethod(ITensorVisualizationBase.visualize, Tuple{AbstractDataGraph})
+    @test isnothing(ITensorVisualizationBase.visualize(g))
+end
+end