build-sys: create Makefile-man.am automatically

[elogind.git] / make-man-rules.py

diff --git a/make-man-rules.py b/make-man-rules.py
new file mode 100644 (file)
index 0000000..b88b43a
--- /dev/null
+++ b/make-man-rules.py
@@ -0,0 +1,92 @@
+#  -*- Mode: python; coding: utf-8; indent-tabs-mode: nil -*- */
+#
+#  This file is part of systemd.
+#
+#  Copyright 2013 Zbigniew Jędrzejewski-Szmek
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+#
+#  systemd is distributed in the hope that it will be useful, but
+#  WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+#  Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public License
+#  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import print_function
+import xml.etree.ElementTree as tree
+import collections
+import sys
+
+SECTION = '''\
+MANPAGES += \\
+       {manpages}
+MANPAGES_ALIAS += \\
+       {aliases}
+{rules}
+'''
+
+CONDITIONAL = '''\
+if {conditional}
+''' \
++ SECTION + \
+'''\
+endif
+'''
+
+HEADER = '''\
+# Do not edit. Generated by make-man-rules.py.
+# Regenerate with 'make update-man-list'.
+
+'''
+
+def man(page, number):
+    return 'man/{}.{}'.format(page, number)
+
+def add_rules(rules, name):
+    xml = tree.parse(name)
+    # print('parsing {}'.format(name), file=sys.stderr)
+    conditional = xml.getroot().get('conditional') or ''
+    rulegroup = rules[conditional]
+    refmeta = xml.find('./refmeta')
+    title = refmeta.find('./refentrytitle').text
+    number = refmeta.find('./manvolnum').text
+    refnames = xml.findall('./refnamediv/refname')
+    target = man(refnames[0].text, number)
+    if title != refnames[0].text:
+        raise ValueError('refmeta and refnamediv disagree: ' + name)
+    for refname in refnames:
+        assert all(refname not in group
+                   for group in rules.values()), "duplicate page name"
+        alias = man(refname.text, number)
+        rulegroup[alias] = target
+        # print('{} => {} [{}]'.format(alias, target, conditional), file=sys.stderr)
+
+def create_rules(*xml_files):
+    " {conditional => {alias-name => source-name}} "
+    rules = collections.defaultdict(dict)
+    for name in xml_files:
+        add_rules(rules, name)
+    return rules
+
+def mjoin(files):
+    return ' \\\n\t'.join(sorted(files) or '#')
+
+def make_makefile(rules):
+    return HEADER + '\n'.join(
+        (CONDITIONAL if conditional else SECTION).format(
+            manpages=mjoin(set(rulegroup.values())),
+            aliases=mjoin(k for k,v in rulegroup.items() if k != v),
+            rules='\n'.join('{}: {}'.format(k,v)
+                            for k,v in sorted(rulegroup.items())
+                            if k != v),
+            conditional=conditional)
+        for conditional,rulegroup in sorted(rules.items()))
+
+if __name__ == '__main__':
+    rules = create_rules(*sys.argv[1:])
+    print(make_makefile(rules), end='')