247 lines
7.9 KiB
Python
247 lines
7.9 KiB
Python
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#!/usr/bin/env python3
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# Copyright (c) 2018-2019, Ulf Magnusson
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# SPDX-License-Identifier: ISC
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"""
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Implements oldconfig functionality.
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1. Loads existing .config
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2. Prompts for the value of all modifiable symbols/choices that
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aren't already set in the .config
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3. Writes an updated .config
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The default input/output filename is '.config'. A different filename can be
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passed in the KCONFIG_CONFIG environment variable.
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When overwriting a configuration file, the old version is saved to
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<filename>.old (e.g. .config.old).
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Entering '?' displays the help text of the symbol/choice, if any.
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Unlike 'make oldconfig', this script doesn't print menu titles and comments,
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but gives Kconfig definition locations. Printing menus and comments would be
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pretty easy to add: Look at the parents of each item, and print all menu
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prompts and comments unless they have already been printed (assuming you want
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to skip "irrelevant" menus).
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"""
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from __future__ import print_function
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import sys
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from kconfiglib import Symbol, Choice, BOOL, TRISTATE, HEX, standard_kconfig
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# Python 2/3 compatibility hack
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if sys.version_info[0] < 3:
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input = raw_input
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def _main():
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# Earlier symbols in Kconfig files might depend on later symbols and become
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# visible if their values change. This flag is set to True if the value of
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# any symbol changes, in which case we rerun the oldconfig to check for new
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# visible symbols.
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global conf_changed
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kconf = standard_kconfig(__doc__)
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print(kconf.load_config())
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while True:
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conf_changed = False
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for node in kconf.node_iter():
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oldconfig(node)
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if not conf_changed:
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break
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print(kconf.write_config())
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def oldconfig(node):
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"""
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Prompts the user for a value if node.item is a visible symbol/choice with
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no user value.
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"""
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# See main()
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global conf_changed
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# Only symbols and choices can be configured
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if not isinstance(node.item, (Symbol, Choice)):
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return
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# Skip symbols and choices that aren't visible
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if not node.item.visibility:
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return
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# Skip symbols and choices that don't have a prompt (at this location)
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if not node.prompt:
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return
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if isinstance(node.item, Symbol):
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sym = node.item
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# Skip symbols that already have a user value
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if sym.user_value is not None:
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return
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# Skip symbols that can only have a single value, due to selects
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if len(sym.assignable) == 1:
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return
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# Skip symbols in choices in y mode. We ask once for the entire choice
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# instead.
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if sym.choice and sym.choice.tri_value == 2:
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return
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# Loop until the user enters a valid value or enters a blank string
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# (for the default value)
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while True:
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val = input("{} ({}) [{}] ".format(
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node.prompt[0], _name_and_loc_str(sym),
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_default_value_str(sym)))
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if val == "?":
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_print_help(node)
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continue
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# Substitute a blank string with the default value the symbol
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# would get
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if not val:
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val = sym.str_value
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# Automatically add a "0x" prefix for hex symbols, like the
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# menuconfig interface does. This isn't done when loading .config
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# files, hence why set_value() doesn't do it automatically.
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if sym.type == HEX and not val.startswith(("0x", "0X")):
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val = "0x" + val
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old_str_val = sym.str_value
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# Kconfiglib itself will print a warning here if the value
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# is invalid, so we don't need to bother
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if sym.set_value(val):
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# Valid value input. We're done with this node.
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if sym.str_value != old_str_val:
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conf_changed = True
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return
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else:
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choice = node.item
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# Skip choices that already have a visible user selection...
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if choice.user_selection and choice.user_selection.visibility == 2:
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# ...unless there are new visible symbols in the choice. (We know
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# they have y (2) visibility in that case, because m-visible
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# symbols get demoted to n-visibility in y-mode choices, and the
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# user-selected symbol had visibility y.)
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for sym in choice.syms:
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if sym is not choice.user_selection and sym.visibility and \
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sym.user_value is None:
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# New visible symbols in the choice
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break
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else:
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# No new visible symbols in the choice
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return
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# Get a list of available selections. The mode of the choice limits
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# the visibility of the choice value symbols, so this will indirectly
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# skip choices in n and m mode.
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options = [sym for sym in choice.syms if sym.visibility == 2]
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if not options:
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# No y-visible choice value symbols
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return
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# Loop until the user enters a valid selection or a blank string (for
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# the default selection)
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while True:
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print("{} ({})".format(node.prompt[0], _name_and_loc_str(choice)))
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for i, sym in enumerate(options, 1):
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print("{} {}. {} ({})".format(
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">" if sym is choice.selection else " ",
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i,
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# Assume people don't define choice symbols with multiple
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# prompts. That generates a warning anyway.
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sym.nodes[0].prompt[0],
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sym.name))
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sel_index = input("choice[1-{}]: ".format(len(options)))
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if sel_index == "?":
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_print_help(node)
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continue
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# Pick the default selection if the string is blank
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if not sel_index:
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choice.selection.set_value(2)
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break
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try:
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sel_index = int(sel_index)
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except ValueError:
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print("Bad index", file=sys.stderr)
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continue
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if not 1 <= sel_index <= len(options):
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print("Bad index", file=sys.stderr)
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continue
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# Valid selection
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if options[sel_index - 1].tri_value != 2:
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conf_changed = True
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options[sel_index - 1].set_value(2)
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break
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# Give all of the non-selected visible choice symbols the user value n.
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# This makes it so that the choice is no longer considered new once we
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# do additional passes, if the reason that it was considered new was
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# that it had new visible choice symbols.
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#
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# Only giving visible choice symbols the user value n means we will
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# prompt for the choice again if later user selections make more new
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# choice symbols visible, which is correct.
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for sym in choice.syms:
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if sym is not choice.user_selection and sym.visibility:
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sym.set_value(0)
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def _name_and_loc_str(sc):
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# Helper for printing the name of the symbol/choice 'sc' along with the
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# location(s) in the Kconfig files where it is defined. Unnamed choices
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# return "choice" instead of the name.
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return "{}, defined at {}".format(
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sc.name or "choice",
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", ".join("{}:{}".format(node.filename, node.linenr)
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for node in sc.nodes))
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def _print_help(node):
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print("\n" + (node.help or "No help text\n"))
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def _default_value_str(sym):
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# Returns the "m/M/y" string in e.g.
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#
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# TRISTATE_SYM prompt (TRISTATE_SYM, defined at Kconfig:9) [n/M/y]:
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#
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# For string/int/hex, returns the default value as-is.
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if sym.type in (BOOL, TRISTATE):
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return "/".join(("NMY" if sym.tri_value == tri else "nmy")[tri]
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for tri in sym.assignable)
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# string/int/hex
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return sym.str_value
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if __name__ == "__main__":
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_main()
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