# https://docs.bazel.build/versions/2.1.0/skylark/config.html

FlavorProvider = provider(fields = ['type'])

flavors = ["APPLE", "BANANA", "ORANGE"]

def _impl(ctx):
    raw_flavor = ctx.build_setting_value
    if raw_flavor not in flavors:
        fail(str(ctx.label) + " build setting allowed to take values {"
             + ", ".join(flavors) + "} but was set to unallowed value "
             + raw_flavor)
    return FlavorProvider(type = raw_flavor)

flavor = rule(
    implementation = _impl,
    build_setting = config.string(flag = True)
)