feat(bazel): add a rule to filter the first matching output

bazel/filter_outputs.bzl

@@ -43,3 +43,39 @@ filter_outputs = rule(
       This is useful when a target exposes multiple output files but a single output is only needed.
     """,
 )
+
+def _filter_first_output_impl(ctx):
+    target_label = ctx.attr.target.label
+    target_workspace = target_label.workspace_name if target_label.workspace_name else ctx.workspace_name
+    target_package_manifest_path = "%s/%s" % (target_workspace, target_label.package)
+
+    outputs = ctx.attr.target[DefaultInfo].files.to_list()
+    for filter in ctx.attr.filters:
+        for output in outputs:
+            manifest_path = get_manifest_path(ctx, output)
+            relative_path = manifest_path[len(target_package_manifest_path) + 1:]
+            if filter == relative_path:
+                return [DefaultInfo(files = depset([output]))]
+
+    fail("Could not find output matching any filters in `%s`." % ctx.label)
+
+filter_first_output = rule(
+    implementation = _filter_first_output_impl,
+    attrs = {
+        "target": attr.label(
+            mandatory = True,
+            doc = "Target for which an output should be filtered",
+            providers = [DefaultInfo],
+        ),
+        "filters": attr.string_list(
+            mandatory = True,
+            doc = """Filters to apply to the target. The first output matching a filter will be included
+            in DefaultInfo, with filters earlier in the list taking precedence. Filter paths are expected
+            to be relative to the package owning the target.
+            """,
+        ),
+    },
+    doc = """Rule that can be used to filter a single output from a given target.
+      This is useful when a target exposes multiple output files but a single output is only needed.
+    """,
+)