Add rust-project.json generator
Because we are not relying on Cargo.toml for our crate dependencies,
we need to provide a structured file to rust-analyzer which describes
the locations of the crates. Add a generator for that purpose, similarly
to cc/compdb and cc/ccdeps.
Bug: 156395307
Test: SOONG_GEN_RUST_PROJECT=1 m nothing && \
cat ${ANDROID_BUILD_TOP}/out/soong/rust-project.json
Change-Id: I46efe0adeddae281eaf86707504c3aa15b5e80b8
diff --git a/rust/project_json_test.go b/rust/project_json_test.go
new file mode 100644
index 0000000..6786e72
--- /dev/null
+++ b/rust/project_json_test.go
@@ -0,0 +1,55 @@
+// Copyright 2020 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rust
+
+import (
+ "io/ioutil"
+ "path/filepath"
+ "testing"
+
+ "android/soong/android"
+ "android/soong/cc"
+)
+
+func TestProjectJson(t *testing.T) {
+ bp := `rust_library {
+ name: "liba",
+ srcs: ["src/lib.rs"],
+ crate_name: "a"
+ }` + GatherRequiredDepsForTest()
+ env := map[string]string{"SOONG_GEN_RUST_PROJECT": "1"}
+ fs := map[string][]byte{
+ "foo.rs": nil,
+ "src/lib.rs": nil,
+ }
+
+ cc.GatherRequiredFilesForTest(fs)
+
+ config := android.TestArchConfig(buildDir, env, bp, fs)
+ ctx := CreateTestContext()
+ ctx.Register(config)
+ _, errs := ctx.ParseFileList(".", []string{"Android.bp"})
+ android.FailIfErrored(t, errs)
+ _, errs = ctx.PrepareBuildActions(config)
+ android.FailIfErrored(t, errs)
+
+ // The JSON file is generated via WriteFileToOutputDir. Therefore, it
+ // won't appear in the Output of the TestingSingleton. Manually verify
+ // it exists.
+ _, err := ioutil.ReadFile(filepath.Join(buildDir, "rust-project.json"))
+ if err != nil {
+ t.Errorf("rust-project.json has not been generated")
+ }
+}