scripts/meson-buildoptions.py

   1 #! /usr/bin/env python3
   2
   3 # Generate configure command line options handling code, based on Meson's
   4 # user build options introspection data
   5 #
   6 # Copyright (C) 2021 Red Hat, Inc.
   7 #
   8 # Author: Paolo Bonzini <pbonzini@redhat.com>
   9 #
  10 # This program is free software; you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2, or (at your option)
  13 # any later version.
  14 #
  15 # This program is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  22
  23 import json
  24 import textwrap
  25 import shlex
  26 import sys
  27
  28 SKIP_OPTIONS = {
  29     "default_devices",
  30     "fuzzing_engine",
  31     "qemu_suffix",
  32     "smbd",
  33 }
  34
  35 OPTION_NAMES = {
  36     "b_coverage": "gcov",
  37     "b_lto": "lto",
  38     "malloc": "enable-malloc",
  39     "pkgversion": "with-pkgversion",
  40     "qemu_firmwarepath": "firmwarepath",
  41     "trace_backends": "enable-trace-backends",
  42     "trace_file": "with-trace-file",
  43 }
  44
  45 BUILTIN_OPTIONS = {
  46     "b_coverage",
  47     "b_lto",
  48     "datadir",
  49     "includedir",
  50     "libdir",
  51     "libexecdir",
  52     "localedir",
  53     "localstatedir",
  54     "mandir",
  55     "strip",
  56     "sysconfdir",
  57 }
  58
  59 LINE_WIDTH = 76
  60
  61
  62 # Convert the default value of an option to the string used in
  63 # the help message
  64 def get_help(opt):
  65     if opt["name"] == "libdir":
  66         return 'system default'
  67     value = opt["value"]
  68     if isinstance(value, list):
  69         return ",".join(value)
  70     if isinstance(value, bool):
  71         return "enabled" if value else "disabled"
  72     return str(value)
  73
  74
  75 def wrap(left, text, indent):
  76     spaces = " " * indent
  77     if len(left) >= indent:
  78         yield left
  79         left = spaces
  80     else:
  81         left = (left + spaces)[0:indent]
  82     yield from textwrap.wrap(
  83         text, width=LINE_WIDTH, initial_indent=left, subsequent_indent=spaces
  84     )
  85
  86
  87 def sh_print(line=""):
  88     print('  printf "%s\\n"', shlex.quote(line))
  89
  90
  91 def help_line(left, opt, indent, long):
  92     right = f'{opt["description"]}'
  93     if long:
  94         value = get_help(opt)
  95         if value != "auto" and value != "":
  96             right += f" [{value}]"
  97     if "choices" in opt and long:
  98         choices = "/".join(sorted(opt["choices"]))
  99         right += f" (choices: {choices})"
 100     for x in wrap("  " + left, right, indent):
 101         sh_print(x)
 102
 103
 104 # Return whether the option (a dictionary) can be used with
 105 # arguments.  Booleans can never be used with arguments;
 106 # combos allow an argument only if they accept other values
 107 # than "auto", "enabled", and "disabled".
 108 def allow_arg(opt):
 109     if opt["type"] == "boolean":
 110         return False
 111     if opt["type"] != "combo":
 112         return True
 113     return not (set(opt["choices"]) <= {"auto", "disabled", "enabled"})
 114
 115
 116 # Return whether the option (a dictionary) can be used without
 117 # arguments.  Booleans can only be used without arguments;
 118 # combos require an argument if they accept neither "enabled"
 119 # nor "disabled"
 120 def require_arg(opt):
 121     if opt["type"] == "boolean":
 122         return False
 123     if opt["type"] != "combo":
 124         return True
 125     return not ({"enabled", "disabled"}.intersection(opt["choices"]))
 126
 127
 128 def filter_options(json):
 129     if ":" in json["name"]:
 130         return False
 131     if json["section"] == "user":
 132         return json["name"] not in SKIP_OPTIONS
 133     else:
 134         return json["name"] in BUILTIN_OPTIONS
 135
 136
 137 def load_options(json):
 138     json = [x for x in json if filter_options(x)]
 139     return sorted(json, key=lambda x: x["name"])
 140
 141
 142 def cli_option(opt):
 143     name = opt["name"]
 144     if name in OPTION_NAMES:
 145         return OPTION_NAMES[name]
 146     return name.replace("_", "-")
 147
 148
 149 def cli_help_key(opt):
 150     key = cli_option(opt)
 151     if require_arg(opt):
 152         return key
 153     if opt["type"] == "boolean" and opt["value"]:
 154         return f"disable-{key}"
 155     return f"enable-{key}"
 156
 157
 158 def cli_metavar(opt):
 159     if opt["type"] == "string":
 160         return "VALUE"
 161     if opt["type"] == "array":
 162         return "CHOICES" if "choices" in opt else "VALUES"
 163     return "CHOICE"
 164
 165
 166 def print_help(options):
 167     print("meson_options_help() {")
 168     for opt in sorted(options, key=cli_help_key):
 169         key = cli_help_key(opt)
 170         # The first section includes options that have an arguments,
 171         # and booleans (i.e., only one of enable/disable makes sense)
 172         if require_arg(opt):
 173             metavar = cli_metavar(opt)
 174             left = f"--{key}={metavar}"
 175             help_line(left, opt, 27, True)
 176         elif opt["type"] == "boolean":
 177             left = f"--{key}"
 178             help_line(left, opt, 27, False)
 179         elif allow_arg(opt):
 180             if opt["type"] == "combo" and "enabled" in opt["choices"]:
 181                 left = f"--{key}[=CHOICE]"
 182             else:
 183                 left = f"--{key}=CHOICE"
 184             help_line(left, opt, 27, True)
 185
 186     sh_print()
 187     sh_print("Optional features, enabled with --enable-FEATURE and")
 188     sh_print("disabled with --disable-FEATURE, default is enabled if available")
 189     sh_print("(unless built with --without-default-features):")
 190     sh_print()
 191     for opt in options:
 192         key = opt["name"].replace("_", "-")
 193         if opt["type"] != "boolean" and not allow_arg(opt):
 194             help_line(key, opt, 18, False)
 195     print("}")
 196
 197
 198 def print_parse(options):
 199     print("_meson_option_parse() {")
 200     print("  case $1 in")
 201     for opt in options:
 202         key = cli_option(opt)
 203         name = opt["name"]
 204         if require_arg(opt):
 205             if opt["type"] == "array" and not "choices" in opt:
 206                 print(f'    --{key}=*) quote_sh "-D{name}=$(meson_option_build_array $2)" ;;')
 207             else:
 208                 print(f'    --{key}=*) quote_sh "-D{name}=$2" ;;')
 209         elif opt["type"] == "boolean":
 210             print(f'    --enable-{key}) printf "%s" -D{name}=true ;;')
 211             print(f'    --disable-{key}) printf "%s" -D{name}=false ;;')
 212         else:
 213             if opt["type"] == "combo" and "enabled" in opt["choices"]:
 214                 print(f'    --enable-{key}) printf "%s" -D{name}=enabled ;;')
 215             if opt["type"] == "combo" and "disabled" in opt["choices"]:
 216                 print(f'    --disable-{key}) printf "%s" -D{name}=disabled ;;')
 217             if allow_arg(opt):
 218                 print(f'    --enable-{key}=*) quote_sh "-D{name}=$2" ;;')
 219     print("    *) return 1 ;;")
 220     print("  esac")
 221     print("}")
 222
 223
 224 options = load_options(json.load(sys.stdin))
 225 print("# This file is generated by meson-buildoptions.py, do not edit!")
 226 print_help(options)
 227 print_parse(options)