fix: def output to cue instead of json

Some cue library may requires specific context to eval and is expected to be incomplete.

It is not guarenteed to be exportable to json.

cue/cue.bzl

@@ -1,4 +1,4 @@
-load("@io_bazel_rules_go//go/private:common.bzl", "env_execute", "executable_extension")
+load("@io_bazel_rules_go//go/private:common.bzl", "env_execute")
 
 CuePkg = provider(
     doc = "Collects files from cue_library for use in downstream cue_export",
@@ -20,7 +20,7 @@ def _cue_def(ctx):
     "Cue def library"
     srcs_zip = _zip_src(ctx, ctx.files.srcs)
     merged = _pkg_merge(ctx, srcs_zip)
-    def_out = ctx.actions.declare_file(ctx.label.name + "~def.json")
+    def_out = ctx.actions.declare_file(ctx.label.name + "~def.cue")
 
     args = ctx.actions.args()
     args.add(ctx.executable._cue.path)
@@ -60,8 +60,8 @@ def _cue_library_impl(ctx):
     def_out = _cue_def(ctx)
 
     # Create the manifest input to zipper
-    pkg = "pkg/"+ctx.attr.importpath.split(":")[0]
-    manifest = "".join([pkg+"/"+src.basename + "=" + src.path + "\n" for src in ctx.files.srcs])
+    pkg = "pkg/" + ctx.attr.importpath.split(":")[0]
+    manifest = "".join([pkg + "/" + src.basename + "=" + src.path + "\n" for src in ctx.files.srcs])
     manifest_file = ctx.actions.declare_file(ctx.label.name + "~manifest")
     ctx.actions.write(manifest_file, manifest)
 
@@ -72,7 +72,6 @@ def _cue_library_impl(ctx):
     args.add(pkg.path)
     args.add("@" + manifest_file.path)
 
-
     ctx.actions.run(
         mnemonic = "CuePkg",
         outputs = [pkg],
@@ -160,6 +159,7 @@ def _cue_export(ctx, merged, output):
 
     if ctx.attr.escape:
         args.add("--escape")
+
     #if ctx.attr.ignore:
     #    args.add("--ignore")
     #if ctx.attr.simplify:
@@ -203,8 +203,6 @@ def _cue_export_impl(ctx):
         runfiles = ctx.runfiles(files = [ctx.outputs.export]),
     )
 
-
-
 _cue_deps_attr = attr.label_list(
     doc = "cue_library targets to include in the evaluation",
     providers = [CuePkg],
@@ -321,7 +319,7 @@ the input name, so use this attribute with caution.""",
         executable = True,
         allow_single_file = True,
         cfg = "host",
-    )
+    ),
 }
 
 cue_export = rule(
@@ -375,7 +373,7 @@ def _cue_repository_impl(ctx):
             "-repo_root",
             ctx.path(""),
             "-repo_config",
-            ctx.path(ctx.attr.build_config)
+            ctx.path(ctx.attr.build_config),
         ]
         if ctx.attr.build_file_name:
             cmd.extend(["-build_file_name", ctx.attr.build_file_name])
@@ -438,7 +436,7 @@ cue_repository = repository_rule(
             ],
         ),
         "build_extra_args": attr.string_list(),
-        "build_config": attr.label(default= "@bazel_gazelle_go_repository_config//:WORKSPACE"),
+        "build_config": attr.label(default = "@bazel_gazelle_go_repository_config//:WORKSPACE"),
         "build_directives": attr.string_list(default = []),
 
         # Patches to apply after running gazelle.