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     "audio_drv_list",
  30     "default_devices",
  31     "docdir",
  32     "fuzzing_engine",
  33     "qemu_firmwarepath",
  34     "qemu_suffix",
  35     "sphinx_build",
  36     "trace_file",
  37 }
  38
  39 LINE_WIDTH = 76
  40
  41
  42 # Convert the default value of an option to the string used in
  43 # the help message
  44 def value_to_help(value):
  45     if isinstance(value, list):
  46         return ",".join(value)
  47     if isinstance(value, bool):
  48         return "enabled" if value else "disabled"
  49     return str(value)
  50
  51
  52 def wrap(left, text, indent):
  53     spaces = " " * indent
  54     if len(left) >= indent:
  55         yield left
  56         left = spaces
  57     else:
  58         left = (left + spaces)[0:indent]
  59     yield from textwrap.wrap(
  60         text, width=LINE_WIDTH, initial_indent=left, subsequent_indent=spaces
  61     )
  62
  63
  64 def sh_print(line=""):
  65     print('  printf "%s\\n"', shlex.quote(line))
  66
  67
  68 def help_line(left, opt, indent, long):
  69     right = f'{opt["description"]}'
  70     if long:
  71         value = value_to_help(opt["value"])
  72         if value != "auto":
  73             right += f" [{value}]"
  74     if "choices" in opt and long:
  75         choices = "/".join(sorted(opt["choices"]))
  76         right += f" (choices: {choices})"
  77     for x in wrap("  " + left, right, indent):
  78         sh_print(x)
  79
  80
  81 # Return whether the option (a dictionary) can be used with
  82 # arguments.  Booleans can never be used with arguments;
  83 # combos allow an argument only if they accept other values
  84 # than "auto", "enabled", and "disabled".
  85 def allow_arg(opt):
  86     if opt["type"] == "boolean":
  87         return False
  88     if opt["type"] != "combo":
  89         return True
  90     return not (set(opt["choices"]) <= {"auto", "disabled", "enabled"})
  91
  92
  93 def load_options(json):
  94     json = [
  95         x
  96         for x in json
  97         if x["section"] == "user"
  98         and ":" not in x["name"]
  99         and x["name"] not in SKIP_OPTIONS
 100     ]
 101     return sorted(json, key=lambda x: x["name"])
 102
 103
 104 def print_help(options):
 105     print("meson_options_help() {")
 106     for opt in options:
 107         key = opt["name"].replace("_", "-")
 108         # The first section includes options that have an arguments,
 109         # and booleans (i.e., only one of enable/disable makes sense)
 110         if opt["type"] == "boolean":
 111             left = f"--disable-{key}" if opt["value"] else f"--enable-{key}"
 112             help_line(left, opt, 27, False)
 113         elif allow_arg(opt):
 114             if opt["type"] == "combo" and "enabled" in opt["choices"]:
 115                 left = f"--enable-{key}[=CHOICE]"
 116             else:
 117                 left = f"--enable-{key}=CHOICE"
 118             help_line(left, opt, 27, True)
 119
 120     sh_print()
 121     sh_print("Optional features, enabled with --enable-FEATURE and")
 122     sh_print("disabled with --disable-FEATURE, default is enabled if available")
 123     sh_print("(unless built with --without-default-features):")
 124     sh_print()
 125     for opt in options:
 126         key = opt["name"].replace("_", "-")
 127         if opt["type"] != "boolean" and not allow_arg(opt):
 128             help_line(key, opt, 18, False)
 129     print("}")
 130
 131
 132 def print_parse(options):
 133     print("_meson_option_parse() {")
 134     print("  case $1 in")
 135     for opt in options:
 136         key = opt["name"].replace("_", "-")
 137         name = opt["name"]
 138         if opt["type"] == "boolean":
 139             print(f'    --enable-{key}) printf "%s" -D{name}=true ;;')
 140             print(f'    --disable-{key}) printf "%s" -D{name}=false ;;')
 141         else:
 142             if opt["type"] == "combo" and "enabled" in opt["choices"]:
 143                 print(f'    --enable-{key}) printf "%s" -D{name}=enabled ;;')
 144             if opt["type"] == "combo" and "disabled" in opt["choices"]:
 145                 print(f'    --disable-{key}) printf "%s" -D{name}=disabled ;;')
 146             if allow_arg(opt):
 147                 print(f'    --enable-{key}=*) quote_sh "-D{name}=$2" ;;')
 148     print("    *) return 1 ;;")
 149     print("  esac")
 150     print("}")
 151
 152
 153 options = load_options(json.load(sys.stdin))
 154 print("# This file is generated by meson-buildoptions.py, do not edit!")
 155 print_help(options)
 156 print_parse(options)