Add support for Bazel in Gerrit tree build

Change-Id: I67a8c8b9e7e7139e54368016f49dff821708ad95
diff --git a/.buckconfig b/.buckconfig
deleted file mode 100644
index 112615b..0000000
--- a/.buckconfig
+++ /dev/null
@@ -1,10 +0,0 @@
-[alias]
-  automerger = //:automerger
-  plugin = //:automerger
-[java]
-  src_roots = java, resources
-[project]
-  ignore = .git
-[cache]
-  mode = dir
-  dir = buck-out/cache
diff --git a/BUCK b/BUCK
deleted file mode 100644
index 95b0c44..0000000
--- a/BUCK
+++ /dev/null
@@ -1,58 +0,0 @@
-include_defs('//bucklets/gerrit_plugin.bucklet')
-include_defs('//bucklets/maven_jar.bucklet')
-
-gerrit_plugin(
-  name = 'automerger',
-  srcs = glob(['src/main/java/**/*.java']),
-  resources = glob(['src/main/**/*']),
-  manifest_entries = [
-    'Gerrit-PluginName: automerger',
-    'Gerrit-Module: com.googlesource.gerrit.plugins.automerger.AutomergerModule',
-    'Implementation-Title: Automerger plugin',
-    'Implementation-URL: https://gerrit-review.googlesource.com/#/admin/projects/plugins/automerger',
-  ],
-  deps = [
-    ':re2j',
-    ':yaml',
-  ],
-)
-
-define_license(name = 're2j')
-
-maven_jar(
-  name = 'yaml',
-  id = 'org.yaml:snakeyaml:1.17',
-  sha1 = '7a27ea250c5130b2922b86dea63cbb1cc10a660c',
-  license = 'Apache2.0',
-)
-
-maven_jar(
-  name = 'mockito',
-  id = 'org.mockito:mockito-all:1.10.19',
-  sha1 = '539df70269cc254a58cccc5d8e43286b4a73bf30',
-  license = 'DO_NOT_DISTRIBUTE',
-)
-
-maven_jar(
-  name = 're2j',
-  id = 'com.google.re2j:re2j:1.0',
-  sha1 = 'd24ac5f945b832d93a55343cd1645b1ba3eca7c3',
-  license = 're2j',
-  local_license = True,
-)
-
-java_test(
-  name = 'automerger_tests',
-  srcs = glob(['src/test/java/**/*.java']),
-  resources = glob(['src/test/resources/**/*']),
-  labels = ['automerger'],
-  deps = GERRIT_PLUGIN_API + GERRIT_TESTS + [
-    ':automerger__plugin',
-    ':mockito',
-  ],
-)
-
-java_library(
-  name = 'classpath',
-  deps = [':automerger__plugin'] + GERRIT_PLUGIN_API,
-)
diff --git a/BUILD b/BUILD
new file mode 100644
index 0000000..a8d88ae
--- /dev/null
+++ b/BUILD
@@ -0,0 +1,29 @@
+load("//tools/bzl:junit.bzl", "junit_tests")
+load("//tools/bzl:plugin.bzl", "gerrit_plugin", "PLUGIN_DEPS", "PLUGIN_TEST_DEPS")
+
+gerrit_plugin(
+    name = "automerger",
+    srcs = glob(["src/main/java/**/*.java"]),
+    manifest_entries = [
+        "Gerrit-PluginName: automerger",
+        "Gerrit-Module: com.googlesource.gerrit.plugins.automerger.AutomergerModule",
+        "Implementation-Title: Automerger plugin",
+        "Implementation-URL: https://gerrit-review.googlesource.com/#/admin/projects/plugins/automerger",
+    ],
+    resources = glob(["src/main/resources/**/*"]),
+    deps = [
+        "@re2j//jar",
+        "@yaml//jar",
+    ],
+)
+
+junit_tests(
+    name = "automerger_tests",
+    srcs = glob(["src/test/java/**/*.java"]),
+    resources = glob(["src/test/resources/**/*"]),
+    tags = ["automerger"],
+    deps = PLUGIN_DEPS + PLUGIN_TEST_DEPS + [
+        ":automerger__plugin",
+        "@mockito//jar",
+    ],
+)
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
new file mode 100644
index 0000000..0396eea
--- /dev/null
+++ b/external_plugin_deps.bzl
@@ -0,0 +1,20 @@
+load("//tools/bzl:maven_jar.bzl", "maven_jar")
+
+def external_plugin_deps():
+  maven_jar(
+    name = 'yaml',
+    artifact = 'org.yaml:snakeyaml:1.17',
+    sha1 = '7a27ea250c5130b2922b86dea63cbb1cc10a660c',
+  )
+
+  maven_jar(
+    name = 'mockito',
+    artifact = 'org.mockito:mockito-all:1.10.19',
+    sha1 = '539df70269cc254a58cccc5d8e43286b4a73bf30',
+  )
+
+  maven_jar(
+    name = 're2j',
+    artifact = 'com.google.re2j:re2j:1.0',
+    sha1 = 'd24ac5f945b832d93a55343cd1645b1ba3eca7c3',
+  )
diff --git a/src/main/resources/Documentation/build.md b/src/main/resources/Documentation/build.md
index 24145f3..5ea4113 100644
--- a/src/main/resources/Documentation/build.md
+++ b/src/main/resources/Documentation/build.md
@@ -1,74 +1,56 @@
 Build
 =====
 
-This plugin can be built with Buck.
-
-Buck
-----
-
-Two build modes are supported: Standalone and in Gerrit tree.
-The standalone build mode is recommended, as this mode doesn't require
-the Gerrit tree to exist locally.
-
-
-### Build standalone
-
-Clone bucklets library:
-
-```
-  git clone https://gerrit.googlesource.com/bucklets
-
-```
-and link it to automerger plugin directory:
-
-```
-  cd automerger && ln -s ../bucklets .
-```
-
-Add link to the .buckversion file:
-
-```
-  cd automerger && ln -s bucklets/buckversion .buckversion
-```
-
-Add link to the .watchmanconfig file:
-```
-  cd automerger && ln -s bucklets/watchmanconfig .watchmanconfig
-```
-
-To build the plugin, issue the following command:
-
-
-```
-  buck build plugin
-```
-
-The output is created in
-
-```
-  buck-out/gen/automerger.jar
-```
-
-### Build in Gerrit tree
+This plugin is built using Bazel.
+Only the Gerrit in-tree build is supported.
 
 Clone or link this plugin to the plugins directory of Gerrit's source
-tree, and issue the command:
+tree.
 
 ```
-  buck build plugins/automerger
+  git clone https://gerrit.googlesource.com/gerrit
+  git clone https://gerrit.googlesource.com/plugins/automerger
+  cd gerrit/plugins
+  ln -s ../../automerger .
+```
+
+Put the external dependency Bazel build file into the Gerrit /plugins
+directory, replacing the existing empty one.
+
+```
+  cd gerrit/plugins
+  rm external_plugin_deps.bzl
+  ln -s automerger/external_plugin_deps.bzl .
+```
+
+From Gerrit source tree issue the command:
+
+```
+  bazel build plugins/automerger
 ```
 
 The output is created in
 
 ```
-  buck-out/gen/plugins/automerger/automerger.jar
+  bazel-genfiles/plugins/automerger/automerger.jar
 ```
 
-This project can be imported into the Eclipse IDE:
+To execute the tests run:
+
+```
+  bazel test plugins/automerger:automerger_tests
+```
+
+or filtering using the comma separated tags:
+
+````
+  bazel test --test_tag_filters=automerger //...
+````
+
+This project can be imported into the Eclipse IDE.
+Add the plugin name to the `CUSTOM_PLUGINS` set in
+Gerrit core in `tools/bzl/plugins.bzl`, and execute:
 
 ```
   ./tools/eclipse/project.py
 ```
-
-How to build the Gerrit Plugin API is described in the [Gerrit
-documentation](../../../Documentation/dev-buck.html#_extension_and_plugin_api_jar_files).