WORKSPACE.bazel

workspace(
    name = "python_example",
)

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

# ----------------- Gazelle support -------------------

# https://github.com/bazelbuild/rules_python/blob/main/gazelle/README.md

# Depend on Go because Gazelle is written in Go and we compile
# from source in this example. Possibly in the future rules_python
# could include precompiled Gazelle binaries?

http_archive(
    name = "io_bazel_rules_go",
    sha256 = "d6b2513456fe2229811da7eb67a444be7785f5323c6708b38d851d2b51e54d83",
    urls = [
        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.30.0/rules_go-v0.30.0.zip",
        "https://github.com/bazelbuild/rules_go/releases/download/v0.30.0/rules_go-v0.30.0.zip",
    ],
)

http_archive(
    name = "bazel_gazelle",
    sha256 = "de69a09dc70417580aabf20a28619bb3ef60d038470c7cf8442fafcf627c21cb",
    urls = [
        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.24.0/bazel-gazelle-v0.24.0.tar.gz",
        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.24.0/bazel-gazelle-v0.24.0.tar.gz",
    ],
)

load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies")
load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")

go_rules_dependencies()

go_register_toolchains(version = "1.17.6")

gazelle_dependencies(go_repository_default_config = "@//:WORKSPACE.bazel")

# ------

# Python support

http_archive(
    name = "rules_python",
    sha256 = "a30abdfc7126d497a7698c29c46ea9901c6392d6ed315171a6df5ce433aa4502",
    strip_prefix = "rules_python-0.6.0",
    url = "https://github.com/bazelbuild/rules_python/archive/0.6.0.tar.gz",
)

load("@rules_python//python:pip.bzl", "pip_install")

# There are several competing tools for dependency resolution in
# Python. rules_python has chosen to support pip, the most common.

# requirements.txt = list of needed packages
# requirements-lock.txt = transitive closure

# python -m pip install pip-tools
# pip-compile --generate-hashes --output-file=requirements_lock.txt requirements.txt

# Then, Gazelle Python support requires that gazelle_python_manifest
# be populated using this command:

# bazel run //app:gazelle_python_manifest.update

# Finally, this updates/creates the BUILD.bazel files:
# bazel run //:gazelle

# Run pip, create Bazel targets for the packages therein.

# "By default, pip_install uses the system command "python3". This can
# be overridden by passing the python_interpreter attribute or
# python_interpreter_target attribute to pip_install."

pip_install(
    name = "pip",  # Which is also the default. You can have more than one.
    requirements = "//app:requirements_lock.txt",
)

# The rules_python gazelle extension has some third-party go dependencies
# which we need to fetch in order to compile it.
load("@rules_python//gazelle:deps.bzl", _py_gazelle_deps = "gazelle_deps")

_py_gazelle_deps()