tools/make-directive-index.py

   1 #!/usr/bin/env python3
   2 #  -*- Mode: python; coding: utf-8; indent-tabs-mode: nil -*- */
   3 # SPDX-License-Identifier: LGPL-2.1+
   4 #
   5 #  Copyright © 2012-2013 Zbigniew Jędrzejewski-Szmek
   6
   7 import sys
   8 import collections
   9 import re
  10 from xml_helper import xml_parse, xml_print, tree
  11 from copy import deepcopy
  12
  13 TEMPLATE = '''\
  14 <refentry id="systemd.directives" conditional="HAVE_PYTHON">
  15
  16         <refentryinfo>
  17                 <title>systemd.directives</title>
  18                 <productname>systemd</productname>
  19         </refentryinfo>
  20
  21         <refmeta>
  22                 <refentrytitle>systemd.directives</refentrytitle>
  23                 <manvolnum>7</manvolnum>
  24         </refmeta>
  25
  26         <refnamediv>
  27                 <refname>systemd.directives</refname>
  28                 <refpurpose>Index of configuration directives</refpurpose>
  29         </refnamediv>
  30
  31         <refsect1>
  32                 <title>Unit directives</title>
  33
  34                 <para>Directives for configuring units, used in unit
  35                 files.</para>
  36
  37                 <variablelist id='unit-directives' />
  38         </refsect1>
  39
  40         <refsect1>
  41                 <title>Options on the kernel command line</title>
  42
  43                 <para>Kernel boot options for configuring the behaviour of the
  44                 systemd process.</para>
  45
  46                 <variablelist id='kernel-commandline-options' />
  47         </refsect1>
  48
  49         <refsect1>
  50                 <title>Environment variables</title>
  51
  52                 <para>Environment variables understood by the systemd
  53                 manager and other programs.</para>
  54
  55                 <variablelist id='environment-variables' />
  56         </refsect1>
  57
  58         <refsect1>
  59                 <title>UDEV directives</title>
  60
  61                 <para>Directives for configuring systemd units through the
  62                 udev database.</para>
  63
  64                 <variablelist id='udev-directives' />
  65         </refsect1>
  66
  67         <refsect1>
  68                 <title>Network directives</title>
  69
  70                 <para>Directives for configuring network links through the
  71                 net-setup-link udev builtin and networks through
  72                 systemd-networkd.</para>
  73
  74                 <variablelist id='network-directives' />
  75         </refsect1>
  76
  77         <refsect1>
  78                 <title>Journal fields</title>
  79
  80                 <para>Fields in the journal events with a well known meaning.</para>
  81
  82                 <variablelist id='journal-directives' />
  83         </refsect1>
  84
  85         <refsect1>
  86                 <title>PAM configuration directives</title>
  87
  88                 <para>Directives for configuring PAM behaviour.</para>
  89
  90                 <variablelist id='pam-directives' />
  91         </refsect1>
  92
  93         <refsect1>
  94                 <title><filename>/etc/crypttab</filename> and
  95                 <filename>/etc/fstab</filename> options</title>
  96
  97                 <para>Options which influence mounted filesystems and
  98                 encrypted volumes.</para>
  99
 100                 <variablelist id='fstab-options' />
 101         </refsect1>
 102
 103         <refsect1>
 104                 <title>System manager directives</title>
 105
 106                 <para>Directives for configuring the behaviour of the
 107                 systemd process.</para>
 108
 109                 <variablelist id='systemd-directives' />
 110         </refsect1>
 111
 112         <refsect1>
 113                 <title>command line options</title>
 114
 115                 <para>Command-line options accepted by programs in the
 116                 systemd suite.</para>
 117
 118                 <variablelist id='options' />
 119         </refsect1>
 120
 121         <refsect1>
 122                 <title>Constants</title>
 123
 124                 <para>Various constant used and/or defined by systemd.</para>
 125
 126                 <variablelist id='constants' />
 127         </refsect1>
 128
 129         <refsect1>
 130                 <title>Miscellaneous options and directives</title>
 131
 132                 <para>Other configuration elements which don't fit in
 133                 any of the above groups.</para>
 134
 135                 <variablelist id='miscellaneous' />
 136         </refsect1>
 137
 138         <refsect1>
 139                 <title>Files and directories</title>
 140
 141                 <para>Paths and file names referred to in the
 142                 documentation.</para>
 143
 144                 <variablelist id='filenames' />
 145         </refsect1>
 146
 147         <refsect1>
 148                 <title>Colophon</title>
 149                 <para id='colophon' />
 150         </refsect1>
 151 </refentry>
 152 '''
 153
 154 COLOPHON = '''\
 155 This index contains {count} entries in {sections} sections,
 156 referring to {pages} individual manual pages.
 157 '''
 158
 159 def _extract_directives(directive_groups, formatting, page):
 160     t = xml_parse(page)
 161     section = t.find('./refmeta/manvolnum').text
 162     pagename = t.find('./refmeta/refentrytitle').text
 163
 164     storopt = directive_groups['options']
 165     for variablelist in t.iterfind('.//variablelist'):
 166         klass = variablelist.attrib.get('class')
 167         storvar = directive_groups[klass or 'miscellaneous']
 168         # <option>s go in OPTIONS, unless class is specified
 169         for xpath, stor in (('./varlistentry/term/varname', storvar),
 170                             ('./varlistentry/term/option',
 171                              storvar if klass else storopt)):
 172             for name in variablelist.iterfind(xpath):
 173                 text = re.sub(r'([= ]).*', r'\1', name.text).rstrip()
 174                 stor[text].append((pagename, section))
 175                 if text not in formatting:
 176                     # use element as formatted display
 177                     if name.text[-1] in '= ':
 178                         name.clear()
 179                     else:
 180                         name.tail = ''
 181                     name.text = text
 182                     formatting[text] = name
 183
 184     storfile = directive_groups['filenames']
 185     for xpath, absolute_only in (('.//refsynopsisdiv//filename', False),
 186                                  ('.//refsynopsisdiv//command', False),
 187                                  ('.//filename', True)):
 188         for name in t.iterfind(xpath):
 189             if absolute_only and not (name.text and name.text.startswith('/')):
 190                 continue
 191             if name.attrib.get('noindex'):
 192                 continue
 193             name.tail = ''
 194             if name.text:
 195                 if name.text.endswith('*'):
 196                     name.text = name.text[:-1]
 197                 if not name.text.startswith('.'):
 198                     text = name.text.partition(' ')[0]
 199                     if text != name.text:
 200                         name.clear()
 201                         name.text = text
 202                     if text.endswith('/'):
 203                         text = text[:-1]
 204                     storfile[text].append((pagename, section))
 205                     if text not in formatting:
 206                         # use element as formatted display
 207                         formatting[text] = name
 208             else:
 209                 text = ' '.join(name.itertext())
 210                 storfile[text].append((pagename, section))
 211                 formatting[text] = name
 212
 213     storfile = directive_groups['constants']
 214     for name in t.iterfind('.//constant'):
 215         if name.attrib.get('noindex'):
 216             continue
 217         name.tail = ''
 218         if name.text.startswith('('): # a cast, strip it
 219             name.text = name.text.partition(' ')[2]
 220         storfile[name.text].append((pagename, section))
 221         formatting[name.text] = name
 222
 223 def _make_section(template, name, directives, formatting):
 224     varlist = template.find(".//*[@id='{}']".format(name))
 225     for varname, manpages in sorted(directives.items()):
 226         entry = tree.SubElement(varlist, 'varlistentry')
 227         term = tree.SubElement(entry, 'term')
 228         display = deepcopy(formatting[varname])
 229         term.append(display)
 230
 231         para = tree.SubElement(tree.SubElement(entry, 'listitem'), 'para')
 232
 233         b = None
 234         for manpage, manvolume in sorted(set(manpages)):
 235             if b is not None:
 236                 b.tail = ', '
 237             b = tree.SubElement(para, 'citerefentry')
 238             c = tree.SubElement(b, 'refentrytitle')
 239             c.text = manpage
 240             c.attrib['target'] = varname
 241             d = tree.SubElement(b, 'manvolnum')
 242             d.text = manvolume
 243         entry.tail = '\n\n'
 244
 245 def _make_colophon(template, groups):
 246     count = 0
 247     pages = set()
 248     for group in groups:
 249         count += len(group)
 250         for pagelist in group.values():
 251             pages |= set(pagelist)
 252
 253     para = template.find(".//para[@id='colophon']")
 254     para.text = COLOPHON.format(count=count,
 255                                 sections=len(groups),
 256                                 pages=len(pages))
 257
 258 def _make_page(template, directive_groups, formatting):
 259     """Create an XML tree from directive_groups.
 260
 261     directive_groups = {
 262        'class': {'variable': [('manpage', 'manvolume'), ...],
 263                  'variable2': ...},
 264        ...
 265     }
 266     """
 267     for name, directives in directive_groups.items():
 268         _make_section(template, name, directives, formatting)
 269
 270     _make_colophon(template, directive_groups.values())
 271
 272     return template
 273
 274 def make_page(*xml_files):
 275     "Extract directives from xml_files and return XML index tree."
 276     template = tree.fromstring(TEMPLATE)
 277     names = [vl.get('id') for vl in template.iterfind('.//variablelist')]
 278     directive_groups = {name:collections.defaultdict(list)
 279                         for name in names}
 280     formatting = {}
 281     for page in xml_files:
 282         try:
 283             _extract_directives(directive_groups, formatting, page)
 284         except Exception:
 285             raise ValueError("failed to process " + page)
 286
 287     return _make_page(template, directive_groups, formatting)
 288
 289 if __name__ == '__main__':
 290     with open(sys.argv[1], 'wb') as f:
 291         f.write(xml_print(make_page(*sys.argv[2:])))