# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

# Bug 2059104: New Tab packages localized Fluent files into its train-hop XPI.
# en-US always comes from the in-tree copy; every other locale is packaged only
# for shipped builds, which enable this option. The locale set is read from
# browser/locales/shipped-locales and iterated over by webext-glue/moz.build.
# This file is only pulled in by the browser/extensions project configure, so
# local browser builds leave NEWTAB_XPI_LOCALES unset and package only en-US.
option(
    "--enable-newtab-all-locales",
    env="MOZ_BROWSER_NEWTAB_LOCALES_ALL",
    help="Package all New Tab locales into the train-hop XPI",
)


@depends("--enable-newtab-all-locales", build_environment)
@imports(_from="__builtin__", _import="open")
@imports("os")
def newtab_xpi_locales(enabled, build_env):
    if not enabled:
        return []
    shipped_locales = os.path.join(
        build_env.topsrcdir, "browser", "locales", "shipped-locales"
    )
    if not os.path.exists(shipped_locales):
        return []
    with open(shipped_locales, encoding="utf-8") as fh:
        locales = [line.strip() for line in fh if line.strip()]
    # en-US is packaged from the in-tree copy, not from the l10n clone.
    return [locale for locale in locales if locale != "en-US"]


set_config("NEWTAB_XPI_LOCALES", newtab_xpi_locales)