add buf, buildifier formatters

.bazelrc

@@ -1,2 +1,4 @@
 common --java_language_version=25
 common --java_runtime_version=remotejdk_25
+
+common --experimental_proto_descriptor_sets_include_source_info

BUILD.bazel

@@ -0,0 +1,6 @@
+alias(
+    name = "format",
+    actual = "//tools/format:format",
+)
+
+exports_files(["buf.yaml"])

MODULE.bazel

@@ -1,9 +1,18 @@
+# main dependencies
 bazel_dep(name = "grpc-java", version = "1.75.0")
 bazel_dep(name = "protobuf", version = "33.1")
+bazel_dep(name = "rules_buf", version = "0.5.2")
 bazel_dep(name = "rules_java", version = "9.0.3")
 bazel_dep(name = "rules_jvm_external", version = "6.9")
 bazel_dep(name = "rules_multitool", version = "1.9.0")
 
+# rules_buf setup
+buf = use_extension("@rules_buf//buf:extensions.bzl", "buf")
+
+# make `bazel run @rules_buf_toolchains//:buf` available to run buf.
+use_repo(buf, "rules_buf_toolchains")
+
+# rules_jvm_external setup
 maven = use_extension("@rules_jvm_external//:extensions.bzl", "maven")
 use_repo(maven, "maven")
 
@@ -26,10 +35,12 @@ maven.install(
     strict_visibility = True,
 )
 
+# rules_multitool setup
 multitool = use_extension("@rules_multitool//multitool:extension.bzl", "multitool")
 multitool.hub(lockfile = "//tools:multitool.lock.json")
 use_repo(multitool, "multitool")
 
+# dev dependencies
 bazel_dep(name = "aspect_rules_lint", version = "1.10.2", dev_dependency = True)
 bazel_dep(name = "bazel_env.bzl", version = "0.5.0", dev_dependency = True)
 bazel_dep(name = "buildifier_prebuilt", version = "8.2.1", dev_dependency = True)

buf.yaml

@@ -0,0 +1,4 @@
+version: v2
+lint:
+  use:
+    - STANDARD

hello-world/java/BUILD.bazel

@@ -9,8 +9,8 @@ java_binary(
         "//hello-world/proto/mattnworb/helloworld/v1:service_java_proto",
         "@grpc-java//api",
         "@grpc-java//netty",
-        "@protobuf//java/core",
         "@maven//:net_sourceforge_argparse4j_argparse4j",
+        "@protobuf//java/core",
     ],
 )
 

hello-world/proto/mattnworb/helloworld/v1/BUILD.bazel

@@ -22,4 +22,3 @@ java_grpc_library(
     srcs = [":service_proto"],
     deps = [":service_java_proto"],
 )
-

hello-world/proto/mattnworb/helloworld/v1/service.proto

@@ -4,7 +4,7 @@ package mattnworb.helloworld.v1;
 option java_package = "com.mattnworb.helloworld.v1";
 
 service HelloWorldService {
-  rpc SayHello (SayHelloRequest) returns (SayHelloResponse);
+  rpc SayHello(SayHelloRequest) returns (SayHelloResponse);
 }
 
 message SayHelloRequest {
@@ -13,4 +13,4 @@ message SayHelloRequest {
 
 message SayHelloResponse {
   string message = 1;
-}
+}

tools/BUILD.bazel

@@ -6,9 +6,10 @@ bazel_env(
         "jdk": "@rules_java//toolchains:current_host_java_runtime",
     },
     tools = {
+        "buf": "@rules_buf_toolchains//:buf",
         "buildifier": "@buildifier_prebuilt//:buildifier",
         "format": "//tools/format",
         "jar": "$(JAVABASE)/bin/jar",
         "java": "$(JAVA)",
     },
-)
+)

tools/format/BUILD.bazel

@@ -3,5 +3,7 @@ load("@aspect_rules_lint//format:defs.bzl", "format_multirun")
 format_multirun(
     name = "format",
     java = "@multitool//tools/google-java-format",
+    protocol_buffer = "@rules_buf_toolchains//:buf",
+    starlark = "@buildifier_prebuilt//:buildifier",
     visibility = ["//visibility:public"],
 )