Add standalone Bazel build

Implement the standalone build against API version 2.14.13.

Change-Id: Ida4d7e4098c489585b4f9c9f4b4dc97cea495ba2
diff --git a/.bazelrc b/.bazelrc
new file mode 100644
index 0000000..4ed16cf
--- /dev/null
+++ b/.bazelrc
@@ -0,0 +1,2 @@
+build --workspace_status_command=./tools/workspace-status.sh
+test --build_tests_only
diff --git a/.gitignore b/.gitignore
index f90bb5f..56abc1f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,7 @@
-/.buckd
-/.buckversion
 /.classpath
+*.DS_Store
 /.project
-/.watchmanconfig
-/buck-out/
-/bucklets
+/.settings
+/.primary_build_tool
+/bazel-*
 /eclipse-out
diff --git a/BUILD b/BUILD
index 979b1a4..4bbda03 100644
--- a/BUILD
+++ b/BUILD
@@ -1,13 +1,12 @@
 load("//tools/bzl:plugin.bzl", "gerrit_plugin")
 
 gerrit_plugin(
-  name = 'log-level',
-  srcs = glob(['src/main/java/**/*.java']),
-  deps = ['//lib/log:log4j'],
-  resources = glob(['src/main/resources/**/*']),
-  manifest_entries = [
-    'Gerrit-PluginName: log-level',
-    'Gerrit-Module: com.googlesource.gerrit.plugins.loglevel.LogLevelModule',
-    'Implementation-Title: Log Level plugin',
-  ]
+    name = "log-level",
+    srcs = glob(["src/main/java/**/*.java"]),
+    manifest_entries = [
+        "Gerrit-PluginName: log-level",
+        "Gerrit-Module: com.googlesource.gerrit.plugins.loglevel.LogLevelModule",
+        "Implementation-Title: Log Level plugin",
+    ],
+    resources = glob(["src/main/resources/**/*"]),
 )
diff --git a/WORKSPACE b/WORKSPACE
new file mode 100644
index 0000000..843a0f5
--- /dev/null
+++ b/WORKSPACE
@@ -0,0 +1,26 @@
+workspace(name = "log_level")
+
+load("//:bazlets.bzl", "load_bazlets")
+
+load_bazlets(
+    commit = "ca8f37d6b771c55d4c03e463f9f73aa8e216b11b",
+    #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()
diff --git a/bazlets.bzl b/bazlets.bzl
new file mode 100644
index 0000000..f97b72c
--- /dev/null
+++ b/bazlets.bzl
@@ -0,0 +1,16 @@
+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 f893189..d60b6e3 100644
--- a/src/main/resources/Documentation/build.md
+++ b/src/main/resources/Documentation/build.md
@@ -1,17 +1,63 @@
-Build
-=====
+# Build
 
-This @PLUGIN@ plugin is built with Bazel.
+This plugin can be 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. Moreover, there are some limitations and additional manual steps
+required when building in Gerrit tree mode (see corresponding sections).
+
+## 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:
+
+```
+  ./tools/eclipse/project.sh
+```
+
+## Build in Gerrit tree
+
+Clone or link this plugin to the plugins directory of Gerrit's
+source tree. From Gerrit source tree issue the command:
 
 ```
   bazel build plugins/@PLUGIN@
 ```
 
-in the root of Gerrit's source tree to build
+Note that due to a [known issue in Bazel][bazelissue], if the plugin
+has previously been built in standalone mode, it is necessary to clean
+the workspace before building in-tree:
+
+```
+  cd plugins/@PLUGIN@
+  bazel clean --expunge
+```
 
 The output is created in
 
@@ -27,11 +73,10 @@
   ./tools/eclipse/project.py
 ```
 
-To execute the tests run:
-
-```
-  bazel test plugins/@PLUGIN@:websession_flatfile_tests
-```
-
 How to build the Gerrit Plugin API is described in the [Gerrit
 documentation](../../../Documentation/dev-bazel.html#_extension_and_plugin_api_jar_files).
+
+[Back to @PLUGIN@ documentation index][index]
+
+[index]: index.html
+[bazelissue]: https://github.com/bazelbuild/bazel/issues/2797
diff --git a/tools/bzl/BUILD b/tools/bzl/BUILD
new file mode 100644
index 0000000..f40498e
--- /dev/null
+++ b/tools/bzl/BUILD
@@ -0,0 +1 @@
+# Empty BUILD file, needed by Bazel.
diff --git a/tools/bzl/classpath.bzl b/tools/bzl/classpath.bzl
new file mode 100644
index 0000000..d5764f7
--- /dev/null
+++ b/tools/bzl/classpath.bzl
@@ -0,0 +1,4 @@
+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..c157125
--- /dev/null
+++ b/tools/bzl/plugin.bzl
@@ -0,0 +1,5 @@
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_plugin.bzl",
+    "PLUGIN_DEPS",
+    "gerrit_plugin",
+)
diff --git a/tools/eclipse/BUILD b/tools/eclipse/BUILD
new file mode 100644
index 0000000..cf1e14b
--- /dev/null
+++ b/tools/eclipse/BUILD
@@ -0,0 +1,9 @@
+load("//tools/bzl:plugin.bzl", "PLUGIN_DEPS")
+load("//tools/bzl:classpath.bzl", "classpath_collector")
+
+classpath_collector(
+    name = "main_classpath_collect",
+    deps = PLUGIN_DEPS + [
+        "//:log-level__plugin",
+    ],
+)
diff --git a/tools/eclipse/project.sh b/tools/eclipse/project.sh
new file mode 100755
index 0000000..45c2961
--- /dev/null
+++ b/tools/eclipse/project.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+# Copyright (C) 2018 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 log-level -r .
diff --git a/tools/workspace-status.sh b/tools/workspace-status.sh
new file mode 100755
index 0000000..6e56b9c
--- /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_LOG-LEVEL_LABEL $(rev .)