CUE Rules for Bazel

Status

While this repository is still in use it is essentially in maintenance mode. For a more featureful set of rules you might consider https://github.com/seh/rules_cue .

Rules

• cue_export
• cue_library

Overview

These build rules are used for building CUE projects with Bazel.

Setup

To use the CUE rules, add the following to your WORKSPACE file to add the external repositories for CUE, making sure to use the latest published versions:

http_archive(
    name = "com_github_tnarg_rules_cue",
    # Make sure to check for the latest version when you install
    url = "https://github.com/tnarg/rules_cue/archive/e3ed06bc3ce1c49afb05f70327ef1119fbdcb61c.zip",
    strip_prefix = "rules_cue-e3ed06bc3ce1c49afb05f70327ef1119fbdcb61c",
    sha256 = "7413394c4c0372e9ad93a2027216a351f355f6abad42d5707ecfaf00cd27a609",
)

load("@com_github_tnarg_rules_cue//cue:deps.bzl", "cue_register_toolchains")
load("@com_github_tnarg_rules_cue//:go.bzl", cue_go_modules = "go_modules")

cue_go_modules()

cue_register_toolchains()

Build Rule Reference

cue_export

cue_export(name, src, deps=[], output_format=<format>", output_name=<src_filename.cue>)

Exports a single CUE entry-point file. The entry-point file may have dependencies (cue_library rules, see below).

Attribute	Description
name	Unique name for this rule (required)
src	Cue compilation entry-point (required).
deps	List of dependencies for the src. Each dependency is a cue_library
output_format	It should be one of :value:json or :value:yaml.
output_name	Output file name, including extension. Defaults to <src_name>.json
expression	expression to be evaluate in the cue file

cue_library

cue_library(name, srcs, importpath, deps=[])

Defines a collection of Cue files that can be depended on by a cue_export. Does not generate any outputs.

Attribute	Description
name	Unique name for this rule (required)
srcs	CUE files included in this library. Package name MUST match the directory name.
importpath	The source import path of this library. Other .cue files can import this library using this path.
deps	Dependencies for the srcs. Each dependency is a cue_library

Gazelle Extension

To use Gazelle in your project to generate BUILD.bazel files for your .cue files, add gazelle to your WORKSPACE, and then add the following to your repository root BUILD.bazel:

load("@bazel_gazelle//:def.bzl", "DEFAULT_LANGUAGES", "gazelle_binary", "gazelle")

gazelle_binary(
    name = "gazelle_binary",
    languages = DEFAULT_LANGUAGES + ["@com_github_tnarg_rules_cue//gazelle/cue:go_default_library"],
    msan = "off",
    pure = "off",
    race = "off",
    static = "off",
    visibility = ["//visibility:public"],
)

# gazelle:prefix github.com/example/project
gazelle(
    name = "gazelle",
    gazelle = "//:gazelle_binary",
)

Run bazel run //:gazelle -- update-repos -from_file=go.mod to update repositories.