Automatically generate bazel rules for go packages

This uses gazelle to generate and update bazel rules for golang packages without adding new BUILD.bazel files to the repository.

Usage

See options for installing bazel.

# Install bazel
brew install bazel # See https://docs.bazel.build/versions/master/install.html

# Create a bazel WORKSPACE file in your repo root
echo >WORKSPACE <<END
git_repository(
  name = "fejta_autogo",
  remote = "https://github.com/fejta/test-infra.git",
  commit = "f478925cc6179f1abf6245698aaf514d873cfcc9",
)
load("@fejta_autogo//autogo:deps.bzl", "autogo_dependencies")
autogo_dependencies()
load("@fejta_autogo//autogo:def.bzl", "autogo_generate")
autogo_generate(
    name = "autogo",
    prefix = "github.com/golang/dep", # change to your go get path
)
END

# Create an empty BUILD.bazel file (needed by bazel)
touch BUILD.bazel

# Use bazel with an @autogo prefix to access the auto-generated repo
bazel query @autogo//...
bazel run @autogo//path/to/my/cmd/binary

Demo

Add bazel support to dep:

git clone https://github.com/fejta/dep  # golang/dep + a WORKSPACE file
cd dep && ls WORKSPACE
bazel run @autogo//cmd/dep -- help

See the concrete WORKSPACE that enables this.