Add standalone bazel build

Test plan:
- bazel clean --expunge
- bazel build importer
- Deploy plugin to gerrit site
- Verify plugin loads without errors
- Verify plugin functionality
- Run tools/eclipse/project.sh
- Import project in Eclipse and verify classpath contains all
  dependencies

Change-Id: Ic2df37ad43d65f77c120c42ea1d332cb305ff711
diff --git a/.gitignore b/.gitignore
index f5c0727..b2cf752 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,8 @@
 /buck-out
 /bucklets
 /.classpath
+/.primary_build_tool
 /.project
 /.settings
+/bazel-*
 /eclipse-out
diff --git a/WORKSPACE b/WORKSPACE
new file mode 100644
index 0000000..6b11560
--- /dev/null
+++ b/WORKSPACE
@@ -0,0 +1,33 @@
+workspace(name = "importer")
+
+load("//:bazlets.bzl", "load_bazlets")
+
+load_bazlets(
+    commit = "c2a97a12543ce2ab59126570ca0aea163a0ee743",
+    # local_path = "/home/<user>/projects/bazlets",
+)
+
+#Snapshot Plugin API
+#load(
+#    "@com_googlesource_gerrit_bazlets//:gerrit_api_maven_local.bzl",
+#    "gerrit_api_maven_local",
+#)
+
+# Load snapshot Plugin API
+#gerrit_api_maven_local()
+
+# Release Plugin API
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_api.bzl",
+    "gerrit_api",
+)
+
+# Load release Plugin API
+gerrit_api()
+
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_gwt.bzl",
+    "gerrit_gwt",
+)
+
+gerrit_gwt()
diff --git a/bazlets.bzl b/bazlets.bzl
new file mode 100644
index 0000000..e14e488
--- /dev/null
+++ b/bazlets.bzl
@@ -0,0 +1,17 @@
+NAME = "com_googlesource_gerrit_bazlets"
+
+def load_bazlets(
+    commit,
+    local_path = None
+  ):
+  if not local_path:
+      native.git_repository(
+          name = NAME,
+          remote = "https://gerrit.googlesource.com/bazlets",
+          commit = commit,
+      )
+  else:
+      native.local_repository(
+          name = NAME,
+          path = local_path,
+      )
diff --git a/src/main/resources/Documentation/build.md b/src/main/resources/Documentation/build.md
index 3c49502..64d5367 100644
--- a/src/main/resources/Documentation/build.md
+++ b/src/main/resources/Documentation/build.md
@@ -1,18 +1,58 @@
 Build
 =====
 
-This plugin can be built with Bazel.
+This plugin is built with Bazel and two build modes are supported:
 
-Clone (or link) this plugin to the `plugins` directory of Gerrit's source tree.
+* Standalone
+* In Gerrit tree.
 
-Then issue
+Standalone build mode is recommended, as this mode doesn't require local Gerrit
+tree to exist.
+
+## Build standalone
+
+To build the plugin, issue the following command:
+
+```
+  bazel build @PLUGIN@
+```
+
+The output is created in
+
+```
+  bazel-genfiles/@PLUGIN@.jar
+```
+
+To package the plugin sources run:
+
+```
+  bazel build lib@PLUGIN@__plugin-src.jar
+```
+
+The output is created in:
+
+```
+  bazel-bin/lib@PLUGIN@__plugin-src.jar
+```
+
+This project can be imported into the Eclipse IDE. Execute:
+
+```
+  ./tools/eclipse/project.sh
+```
+
+to generate the required files and then import the project.
+
+
+## Build in Gerrit tree
+
+Clone or link this plugin to the plugins directory of Gerrit's source
+tree, and issue the command:
 
 ```
   bazel build plugins/@PLUGIN@
 ```
 
-in the root of Gerrit's source tree to build
-
 The output is created in
 
 ```
diff --git a/tools/bazel.rc b/tools/bazel.rc
new file mode 100644
index 0000000..4ed16cf
--- /dev/null
+++ b/tools/bazel.rc
@@ -0,0 +1,2 @@
+build --workspace_status_command=./tools/workspace-status.sh
+test --build_tests_only
diff --git a/tools/bzl/BUILD b/tools/bzl/BUILD
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tools/bzl/BUILD
diff --git a/tools/bzl/classpath.bzl b/tools/bzl/classpath.bzl
new file mode 100644
index 0000000..dfcbe9c
--- /dev/null
+++ b/tools/bzl/classpath.bzl
@@ -0,0 +1,2 @@
+load("@com_googlesource_gerrit_bazlets//tools:classpath.bzl",
+     "classpath_collector")
diff --git a/tools/bzl/plugin.bzl b/tools/bzl/plugin.bzl
new file mode 100644
index 0000000..74d4ce1
--- /dev/null
+++ b/tools/bzl/plugin.bzl
@@ -0,0 +1,6 @@
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_plugin.bzl",
+    "gerrit_plugin",
+    "PLUGIN_DEPS",
+    "GWT_PLUGIN_DEPS",
+)
diff --git a/tools/eclipse/BUILD b/tools/eclipse/BUILD
new file mode 100644
index 0000000..9b749e1
--- /dev/null
+++ b/tools/eclipse/BUILD
@@ -0,0 +1,13 @@
+load(
+    "//tools/bzl:plugin.bzl",
+    "PLUGIN_DEPS",
+    "GWT_PLUGIN_DEPS",
+)
+load("//tools/bzl:classpath.bzl", "classpath_collector")
+
+classpath_collector(
+    name = "main_classpath_collect",
+    deps = PLUGIN_DEPS + GWT_PLUGIN_DEPS + [
+        "//:importer__plugin",
+    ],
+)
diff --git a/tools/eclipse/project.sh b/tools/eclipse/project.sh
new file mode 100755
index 0000000..2d40079
--- /dev/null
+++ b/tools/eclipse/project.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+# Copyright (C) 2017 The Android Open Source Project
+#
+# 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.
+
+`bazel query @com_googlesource_gerrit_bazlets//tools/eclipse:project --output location | sed s/BUILD:.*//`project.py -n importer -r .
diff --git a/tools/workspace-status.sh b/tools/workspace-status.sh
new file mode 100755
index 0000000..25fd73a
--- /dev/null
+++ b/tools/workspace-status.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# This script will be run by bazel when the build process starts to
+# generate key-value information that represents the status of the
+# workspace. The output should be like
+#
+# KEY1 VALUE1
+# KEY2 VALUE2
+#
+# If the script exits with non-zero code, it's considered as a failure
+# and the output will be discarded.
+
+function rev() {
+  cd $1 && git describe --always --match "v[0-9].*" --dirty
+}
+
+echo STABLE_BUILD_IMPORTER_LABEL "$(rev .)"