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>5</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>UDEV directives</title>
  71
  72                 <para>Directives for configuring systemd units through the
  73                 udev database.</para>
  74
  75                 <variablelist id='udev-directives' />
  76         </refsect1>
  77
  78         <refsect1>
  79                 <title>Journal directives</title>
  80
  81                 <para>Directives for configuring the behaviour of the
  82                 journald process.</para>
  83
  84                 <variablelist id='journal-directives' />
  85         </refsect1>
  86 </refentry>
  87 '''
  88
  89 def _extract_directives(directive_groups, page):
  90     t = tree.parse(page)
  91     section = t.find('./refmeta/manvolnum').text
  92     pagename = t.find('./refmeta/refentrytitle').text
  93     for variablelist in t.iterfind('.//variablelist'):
  94         klass = variablelist.attrib.get('class') or 'unit-directives'
  95         stor = directive_groups[klass]
  96         for varname in variablelist.iterfind('./varlistentry/term/varname'):
  97             text = ''.join(varname.text.partition('=')[:2])
  98             stor[text].append((pagename, section))
  99
 100 def _make_section(refentry, name, directives):
 101     varlist = refentry.find(".//*[@id='{}']".format(name))
 102     for varname, manpages in sorted(directives.items()):
 103         entry = tree.SubElement(varlist, 'varlistentry')
 104         a = tree.SubElement(tree.SubElement(entry, 'term'), 'varname')
 105         a.text = varname
 106         para = tree.SubElement(tree.SubElement(entry, 'listitem'), 'para')
 107
 108         b = None
 109         for manpage, manvolume in sorted(manpages):
 110                 if b is not None:
 111                         b.tail = ', '
 112                 b = tree.SubElement(para, 'citerefentry')
 113                 c = tree.SubElement(b, 'refentrytitle')
 114                 c.text = manpage
 115                 d = tree.SubElement(b, 'manvolnum')
 116                 d.text = manvolume
 117         entry.tail = '\n\n'
 118
 119 def _make_page(directive_groups):
 120     """Create an XML tree from directive_groups.
 121
 122     directive_groups = {
 123        'class': {'variable': [('manpage', 'manvolume'), ...],
 124                  'variable2': ...},
 125        ...
 126     }
 127     """
 128     refentry = tree.fromstring(TEMPLATE)
 129
 130     for name, directives in directive_groups.items():
 131             _make_section(refentry, name, directives)
 132
 133     return refentry
 134
 135 def make_page(xml_files):
 136     "Extract directives from xml_files and return XML index tree."
 137     directive_groups = {name:collections.defaultdict(list)
 138                         for name in ['unit-directives',
 139                                      'udev-directives',
 140                                      'systemd-directives',
 141                                      'journal-directives',
 142                                      ]}
 143     for page in xml_files:
 144         _extract_directives(directive_groups, page)
 145
 146     return _make_page(directive_groups)
 147
 148 if __name__ == '__main__':
 149     tree.dump(make_page(sys.argv[1:]))