#!/usr/bin/env python3

# Copyright (c) 2018-2019, Ulf Magnusson
# SPDX-License-Identifier: ISC

"""
Writes a configuration file where as many symbols as possible are set to 'y'.

The default output filename is '.config'. A different filename can be passed
in the KCONFIG_CONFIG environment variable.

Usage for the Linux kernel:

  $ make [ARCH=<arch>] scriptconfig SCRIPT=Kconfiglib/allyesconfig.py
"""
import kconfiglib


def main():
    kconf = kconfiglib.standard_kconfig(__doc__)

    # See allnoconfig.py
    kconf.warn = False

    # Try to set all symbols to 'y'. Dependencies might truncate the value down
    # later, but this will at least give the highest possible value.
    #
    # Assigning 0/1/2 to non-bool/tristate symbols has no effect (int/hex
    # symbols still take a string, because they preserve formatting).
    for sym in kconf.unique_defined_syms:
        # Set choice symbols to 'm'. This value will be ignored for choices in
        # 'y' mode (the "normal" mode), which will instead just get their
        # default selection, but will set all symbols in m-mode choices to 'm',
        # which is as high as they can go.
        #
        # Here's a convoluted example of how you might get an m-mode choice
        # even during allyesconfig:
        #
        #   choice
        #           tristate "weird choice"
        #           depends on m
        sym.set_value(1 if sym.choice else 2)

    # Set all choices to the highest possible mode
    for choice in kconf.unique_choices:
        choice.set_value(2)

    kconf.warn = True

    kconf.load_allconfig("allyes.config")

    print(kconf.write_config())


if __name__ == "__main__":
    main()