Adding return value to .NET merge_assembly bazel build rule

Author: jimevans

dotnet/merge-assemblies.bzl

@@ -1,6 +1,19 @@
-load("@io_bazel_rules_dotnet//dotnet/private:context.bzl", "dotnet_context")
+load(
+    "@io_bazel_rules_dotnet//dotnet/private:context.bzl",
+    "dotnet_context"
+)
+load(
+    "@io_bazel_rules_dotnet//dotnet/private:providers.bzl",
+    "DotnetLibrary",
+)
 
 def _merged_assembly_impl(ctx):
+    dotnet = dotnet_context(ctx)
+    name = ctx.label.name
+
+    deps = ctx.attr.deps
+    result = ctx.outputs.out
+
     args = [
         "-v4",
         "-xmldocs",
@@ -23,13 +36,36 @@ def _merged_assembly_impl(ctx):
         outputs = [ctx.outputs.out]
     )
 
+    data = depset()
+
+    runfiles = depset(direct = [result], transitive = [d[DotnetLibrary].runfiles for d in deps] + [data])
+    transitive = depset(direct = deps, transitive = [a[DotnetLibrary].transitive for a in deps])
+
+    merged_lib = dotnet.new_library(
+        dotnet = dotnet,
+        name = name,
+        deps = deps,
+        transitive = transitive,
+        runfiles = runfiles,
+        result = result,
+    )
+
+    return [
+        merged_lib,
+        DefaultInfo(
+            files = depset([merged_lib.result]),
+            runfiles = ctx.runfiles(files = [], transitive_files = merged_lib.runfiles),
+        ),
+    ]
+
 merged_assembly = rule(
     implementation = _merged_assembly_impl,
     attrs = {
         "src_assembly": attr.label(),
         "deps": attr.label_list(),
         "out": attr.output(mandatory = True),
         "keyfile": attr.label(allow_single_file = True),
+        "dotnet_context_data": attr.label(default = Label("@io_bazel_rules_dotnet//:dotnet_context_data")),
         "merge_tool": attr.label(
             executable = True,
             cfg = "host",