make-directive-index.py

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