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#! /usr/bin/env python3
# Generate configure command line options handling code, based on Meson's
# user build options introspection data
#
# Copyright (C) 2021 Red Hat, Inc.
#
# Author: Paolo Bonzini <pbonzini@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
import json
import textwrap
import shlex
import sys
SKIP_OPTIONS = {
"audio_drv_list",
"default_devices",
"docdir",
"fuzzing_engine",
"iasl",
"qemu_firmwarepath",
"qemu_suffix",
"smbd",
"sphinx_build",
"trace_file",
}
OPTION_NAMES = {
"malloc": "enable-malloc",
"trace_backends": "enable-trace-backends",
}
BUILTIN_OPTIONS = {
"strip",
}
LINE_WIDTH = 76
# Convert the default value of an option to the string used in
# the help message
def value_to_help(value):
if isinstance(value, list):
return ",".join(value)
if isinstance(value, bool):
return "enabled" if value else "disabled"
return str(value)
def wrap(left, text, indent):
spaces = " " * indent
if len(left) >= indent:
yield left
left = spaces
else:
left = (left + spaces)[0:indent]
yield from textwrap.wrap(
text, width=LINE_WIDTH, initial_indent=left, subsequent_indent=spaces
)
def sh_print(line=""):
print(' printf "%s\\n"', shlex.quote(line))
def help_line(left, opt, indent, long):
right = f'{opt["description"]}'
if long:
value = value_to_help(opt["value"])
if value != "auto" and value != "":
right += f" [{value}]"
if "choices" in opt and long:
choices = "/".join(sorted(opt["choices"]))
right += f" (choices: {choices})"
for x in wrap(" " + left, right, indent):
sh_print(x)
# Return whether the option (a dictionary) can be used with
# arguments. Booleans can never be used with arguments;
# combos allow an argument only if they accept other values
# than "auto", "enabled", and "disabled".
def allow_arg(opt):
if opt["type"] == "boolean":
return False
if opt["type"] != "combo":
return True
return not (set(opt["choices"]) <= {"auto", "disabled", "enabled"})
# Return whether the option (a dictionary) can be used without
# arguments. Booleans can only be used without arguments;
# combos require an argument if they accept neither "enabled"
# nor "disabled"
def require_arg(opt):
if opt["type"] == "boolean":
return False
if opt["type"] != "combo":
return True
return not ({"enabled", "disabled"}.intersection(opt["choices"]))
def filter_options(json):
if ":" in json["name"]:
return False
if json["section"] == "user":
return json["name"] not in SKIP_OPTIONS
else:
return json["name"] in BUILTIN_OPTIONS
def load_options(json):
json = [x for x in json if filter_options(x)]
return sorted(json, key=lambda x: x["name"])
def cli_option(opt):
name = opt["name"]
if name in OPTION_NAMES:
return OPTION_NAMES[name]
return name.replace("_", "-")
def cli_help_key(opt):
key = cli_option(opt)
if require_arg(opt):
return key
if opt["type"] == "boolean" and opt["value"]:
return f"disable-{key}"
return f"enable-{key}"
def cli_metavar(opt):
if opt["type"] == "string":
return "VALUE"
if opt["type"] == "array":
return "CHOICES"
return "CHOICE"
def print_help(options):
print("meson_options_help() {")
for opt in sorted(options, key=cli_help_key):
key = cli_help_key(opt)
# The first section includes options that have an arguments,
# and booleans (i.e., only one of enable/disable makes sense)
if require_arg(opt):
metavar = cli_metavar(opt)
left = f"--{key}={metavar}"
help_line(left, opt, 27, True)
elif opt["type"] == "boolean":
left = f"--{key}"
help_line(left, opt, 27, False)
elif allow_arg(opt):
if opt["type"] == "combo" and "enabled" in opt["choices"]:
left = f"--{key}[=CHOICE]"
else:
left = f"--{key}=CHOICE"
help_line(left, opt, 27, True)
sh_print()
sh_print("Optional features, enabled with --enable-FEATURE and")
sh_print("disabled with --disable-FEATURE, default is enabled if available")
sh_print("(unless built with --without-default-features):")
sh_print()
for opt in options:
key = opt["name"].replace("_", "-")
if opt["type"] != "boolean" and not allow_arg(opt):
help_line(key, opt, 18, False)
print("}")
def print_parse(options):
print("_meson_option_parse() {")
print(" case $1 in")
for opt in options:
key = cli_option(opt)
name = opt["name"]
if require_arg(opt):
print(f' --{key}=*) quote_sh "-D{name}=$2" ;;')
elif opt["type"] == "boolean":
print(f' --enable-{key}) printf "%s" -D{name}=true ;;')
print(f' --disable-{key}) printf "%s" -D{name}=false ;;')
else:
if opt["type"] == "combo" and "enabled" in opt["choices"]:
print(f' --enable-{key}) printf "%s" -D{name}=enabled ;;')
if opt["type"] == "combo" and "disabled" in opt["choices"]:
print(f' --disable-{key}) printf "%s" -D{name}=disabled ;;')
if allow_arg(opt):
print(f' --enable-{key}=*) quote_sh "-D{name}=$2" ;;')
print(" *) return 1 ;;")
print(" esac")
print("}")
options = load_options(json.load(sys.stdin))
print("# This file is generated by meson-buildoptions.py, do not edit!")
print_help(options)
print_parse(options)
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