Add initial Rust rules to Bazel.

Todo:
* Implement rust_bench_test for running benchmarks
* Enable rust_test to depend solely on a rust_library (since many projects
  intermix #[test] methods in lib source).
* Improve error checking and handling and prevent rust_binary from directly
  depending on cc_library.
* Implement rust_doc for generating rustdoc.

--
MOS_MIGRATED_REVID=96297772

6 files changed, 117 insertions, 0 deletions

diff --git a/examples/rust/hello_lib/BUILD b/examples/rust/hello_lib/BUILD
new file mode 100644
index 0000000000..64cc935b27
--- /dev/null
+++ b/examples/rust/hello_lib/BUILD
@@ -0,0 +1,17 @@
+package(default_visibility = ["//visibility:public"])
+
+load("/tools/build_rules/rust/rust", "rust_library", "rust_test")
+
+rust_library(
+    name = "hello_lib",
+    srcs = [
+        "src/greeter.rs",
+        "src/lib.rs",
+    ],
+)
+
+rust_test(
+    name = "greeting",
+    srcs = ["tests/greeting.rs"],
+    deps = [":hello_lib"],
+)
diff --git a/examples/rust/hello_lib/src/greeter.rs b/examples/rust/hello_lib/src/greeter.rs
new file mode 100644
index 0000000000..be59ff888d
--- /dev/null
+++ b/examples/rust/hello_lib/src/greeter.rs
@@ -0,0 +1,31 @@
+// Copyright 2015 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.
+
+pub struct Greeter {
+    greeting: String,
+}
+
+impl Greeter {
+    pub fn new(greeting: &str) -> Greeter {
+        Greeter { greeting: greeting.to_string(), }
+    }
+
+    pub fn greeting(&self, thing: &str) -> String {
+        format!("{} {}", &self.greeting, thing)
+    }
+
+    pub fn greet(&self, thing: &str) {
+        println!("{} {}", &self.greeting, thing);
+    }
+}
diff --git a/examples/rust/hello_lib/src/lib.rs b/examples/rust/hello_lib/src/lib.rs
new file mode 100644
index 0000000000..8f2b5a11f5
--- /dev/null
+++ b/examples/rust/hello_lib/src/lib.rs
@@ -0,0 +1,15 @@
+// Copyright 2015 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.
+
+pub mod greeter;
diff --git a/examples/rust/hello_lib/tests/greeting.rs b/examples/rust/hello_lib/tests/greeting.rs
new file mode 100644
index 0000000000..842ba2983b
--- /dev/null
+++ b/examples/rust/hello_lib/tests/greeting.rs
@@ -0,0 +1,23 @@
+// Copyright 2015 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.
+
+extern crate hello_lib;
+
+use hello_lib::greeter;
+
+#[test]
+fn test_greeting() {
+    let hello = greeter::Greeter::new("Hello");
+    assert_eq!("Hello world", hello.greeting("world"));
+}
diff --git a/examples/rust/hello_world/BUILD b/examples/rust/hello_world/BUILD
new file mode 100644
index 0000000000..e774dcc835
--- /dev/null
+++ b/examples/rust/hello_world/BUILD
@@ -0,0 +1,9 @@
+package(default_visibility = ["//visibility:public"])
+
+load("/tools/build_rules/rust/rust", "rust_binary")
+
+rust_binary(
+    name = "hello_world",
+    srcs = ["src/main.rs"],
+    deps = ["//examples/rust/hello_lib"],
+)
diff --git a/examples/rust/hello_world/src/main.rs b/examples/rust/hello_world/src/main.rs
new file mode 100644
index 0000000000..2e837ce0bb
--- /dev/null
+++ b/examples/rust/hello_world/src/main.rs
@@ -0,0 +1,22 @@
+// Copyright 2015 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.
+
+extern crate hello_lib;
+
+use hello_lib::greeter;
+
+fn main() {
+    let hello = greeter::Greeter::new("Hello");
+    hello.greet("world");
+}