environ.bzl

# -*- mode: python -*-
# vi: set ft=python :

# Copyright (c) 2018-2019, Toyota Research Institute.
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#   this list of conditions and the following disclaimer in the documentation
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# Write out a repository that contains:
# - An empty BUILD file, to define a package.
# - An environ.bzl file with variable assignments for each ENV_NAMES item.
def _impl(repository_ctx):
    vars = repository_ctx.attr._vars
    bzl_content = []
    for key in vars:
        value = repository_ctx.os.environ.get(key, "")
        bzl_content.append("{}='{}'\n".format(key, value))
    repository_ctx.file(
        "BUILD.bazel",
        content = "\n",
        executable = False,
    )
    repository_ctx.file(
        "environ.bzl",
        content = "".join(bzl_content),
        executable = False,
    )

drake_repository = repository_rule(
    implementation = _impl,
    environ = ["DAIRLIB_LOCAL_DRAKE_PATH"],
    local = True,
    attrs = {"_vars": attr.string_list(default=["DAIRLIB_LOCAL_DRAKE_PATH"])},
)
inekf_repository = repository_rule(
    implementation = _impl,
    environ = ["DAIRLIB_LOCAL_INEKF_PATH"],
    local = True,
    attrs = {"_vars": attr.string_list(default=["DAIRLIB_LOCAL_INEKF_PATH"])},
)