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Buildifier

buildifier is a tool for formatting bazel BUILD files with a standard convention.

Setup

Build the tool:

  • Checkout the repo and then either via go install or bazel build //buildifier
  • If you already have 'go' installed, then build a binary via:

go get github.com/bazelbuild/buildtools/buildifier

Usage

Use buildifier to create standardized formatting for BUILD files in the same way that clang-format is used for source files.

$ buildifier -showlog -mode=check $(find . -type f \( -iname BUILD -or -iname BUILD.bazel \))

Setup and usage via Bazel

You can also invoke buildifier via the Bazel rule. WORKSPACE file:

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

# buildifier is written in Go and hence needs rules_go to be built.
# See https://github.com/bazelbuild/rules_go for the up to date setup instructions.
http_archive(
    name = "io_bazel_rules_go",
    sha256 = "c1f52b8789218bb1542ed362c4f7de7052abcf254d865d96fb7ba6d44bc15ee3",
    url = "https://github.com/bazelbuild/rules_go/releases/download/0.12.0/rules_go-0.12.0.tar.gz",
)

http_archive(
    name = "com_github_bazelbuild_buildtools",
    strip_prefix = "buildtools-<commit hash>",
    url = "https://github.com/bazelbuild/buildtools/archive/<commit hash>.zip",
)

load("@io_bazel_rules_go//go:def.bzl", "go_register_toolchains", "go_rules_dependencies")
load("@com_github_bazelbuild_buildtools//buildifier:deps.bzl", "buildifier_dependencies")

go_rules_dependencies()

go_register_toolchains()

buildifier_dependencies()

BUILD.bazel typically in the workspace root:

load("@com_github_bazelbuild_buildtools//buildifier:def.bzl", "buildifier")

buildifier(
    name = "buildifier",
)

Invoke with

bazel run --direct_run //:buildifier