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 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 import xml.etree.ElementTree as tree
  23
  24 TEMPLATE = '''\
  25 <refentry id="systemd.directives">
  26
  27         <refentryinfo>
  28                 <title>systemd.directives</title>
  29                 <productname>systemd</productname>
  30
  31                 <authorgroup>
  32                         <author>
  33                                 <contrib>Developer</contrib>
  34                                 <firstname>Zbigniew</firstname>
  35                                 <surname>Jędrzejewski-Szmek</surname>
  36                                 <email>zbyszek@in.waw.pl</email>
  37                         </author>
  38                 </authorgroup>
  39         </refentryinfo>
  40
  41         <refmeta>
  42                 <refentrytitle>systemd.directives</refentrytitle>
  43                 <manvolnum>7</manvolnum>
  44         </refmeta>
  45
  46         <refnamediv>
  47                 <refname>systemd.directives</refname>
  48                 <refpurpose>Index of configuration directives</refpurpose>
  49         </refnamediv>
  50
  51         <refsect1>
  52                 <title>Unit directives</title>
  53
  54                 <para>Directives for configuring units, used in unit
  55                 files.</para>
  56
  57                 <variablelist id='unit-directives' />
  58         </refsect1>
  59
  60         <refsect1>
  61                 <title>System manager directives</title>
  62
  63                 <para>Directives for configuring the behaviour of the
  64                 systemd process.</para>
  65
  66                 <variablelist id='systemd-directives' />
  67         </refsect1>
  68
  69         <refsect1>
  70                 <title>Options on the kernel command line</title>
  71
  72                 <para>Kernel boot options for configuring the behaviour of the
  73                 systemd process.</para>
  74
  75                 <variablelist id='kernel-commandline-directives' />
  76         </refsect1>
  77
  78         <refsect1>
  79                 <title>Environment variables</title>
  80
  81                 <para>Environment variables understood by the systemd process.</para>
  82
  83                 <variablelist id='environment-variables' />
  84         </refsect1>
  85
  86         <refsect1>
  87                 <title>UDEV directives</title>
  88
  89                 <para>Directives for configuring systemd units through the
  90                 udev database.</para>
  91
  92                 <variablelist id='udev-directives' />
  93         </refsect1>
  94
  95         <refsect1>
  96                 <title>Journal directives</title>
  97
  98                 <para>Directives for configuring the behaviour of the
  99                 journald process.</para>
 100
 101                 <variablelist id='journal-directives' />
 102         </refsect1>
 103
 104         <refsect1>
 105                 <title>bootchart.conf directives</title>
 106
 107                 <para>Directives for configuring the behaviour of the
 108                 systemd-bootchart process.</para>
 109
 110                 <variablelist id='bootchart-directives' />
 111         </refsect1>
 112
 113         <refsect1>
 114                 <title>Colophon</title>
 115                 <para id='colophon' />
 116         </refsect1>
 117 </refentry>
 118 '''
 119
 120 COLOPHON = '''\
 121 This index contains {count} entries in {sections} sections,
 122 referring to {pages} individual manual pages.
 123 '''
 124
 125 def _extract_directives(directive_groups, page):
 126     t = tree.parse(page)
 127     section = t.find('./refmeta/manvolnum').text
 128     pagename = t.find('./refmeta/refentrytitle').text
 129     for variablelist in t.iterfind('.//variablelist'):
 130         klass = variablelist.attrib.get('class') or 'unit-directives'
 131         stor = directive_groups[klass]
 132         for varname in variablelist.iterfind('./varlistentry/term/varname'):
 133             text = ''.join(varname.text.partition('=')[:2])
 134             stor[text].append((pagename, section))
 135
 136 def _make_section(template, name, directives):
 137     varlist = template.find(".//*[@id='{}']".format(name))
 138     for varname, manpages in sorted(directives.items()):
 139         entry = tree.SubElement(varlist, 'varlistentry')
 140         a = tree.SubElement(tree.SubElement(entry, 'term'), 'varname')
 141         a.text = varname
 142         para = tree.SubElement(tree.SubElement(entry, 'listitem'), 'para')
 143
 144         b = None
 145         for manpage, manvolume in sorted(manpages):
 146                 if b is not None:
 147                         b.tail = ', '
 148                 b = tree.SubElement(para, 'citerefentry')
 149                 c = tree.SubElement(b, 'refentrytitle')
 150                 c.text = manpage
 151                 d = tree.SubElement(b, 'manvolnum')
 152                 d.text = manvolume
 153         entry.tail = '\n\n'
 154
 155 def _make_colophon(template, groups):
 156     count = 0
 157     pages = set()
 158     for group in groups:
 159         count += len(group)
 160         for pagelist in group.values():
 161             pages |= set(pagelist)
 162
 163     para = template.find(".//para[@id='colophon']")
 164     para.text = COLOPHON.format(count=count,
 165                                 sections=len(groups),
 166                                 pages=len(pages))
 167
 168 def _make_page(template, directive_groups):
 169     """Create an XML tree from directive_groups.
 170
 171     directive_groups = {
 172        'class': {'variable': [('manpage', 'manvolume'), ...],
 173                  'variable2': ...},
 174        ...
 175     }
 176     """
 177     for name, directives in directive_groups.items():
 178             _make_section(template, name, directives)
 179
 180     _make_colophon(template, directive_groups.values())
 181
 182     return template
 183
 184 def make_page(xml_files):
 185     "Extract directives from xml_files and return XML index tree."
 186     template = tree.fromstring(TEMPLATE)
 187     names = [vl.get('id') for vl in template.iterfind('.//variablelist')]
 188     directive_groups = {name:collections.defaultdict(list)
 189                         for name in names}
 190     for page in xml_files:
 191         _extract_directives(directive_groups, page)
 192
 193     return _make_page(template, directive_groups)
 194
 195 if __name__ == '__main__':
 196     tree.dump(make_page(sys.argv[1:]))