1 files changed, 101 insertions, 0 deletions
diff --git a/tools/update-man-rules.py b/tools/update-man-rules.py
new file mode 100755
index 0000000..1c2c9a8
--- /dev/null
+++ b/tools/update-man-rules.py
@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+import collections
+import glob
+import pprint
+import sys
+from pathlib import Path
+
+from xml_helper import xml_parse
+
+
+def man(page, number):
+    return f'{page}.{number}'
+
+def add_rules(rules, name):
+    xml = xml_parse(name)
+    # print('parsing {}'.format(name), file=sys.stderr)
+    if xml.getroot().tag != 'refentry':
+        return
+    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:
+        try:
+            add_rules(rules, name)
+        except Exception:
+            print("Failed to process", name, file=sys.stderr)
+            raise
+    return rules
+
+def mjoin(files):
+    return ' \\\n\t'.join(sorted(files) or '#')
+
+MESON_HEADER = '''\
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+# Do not edit. Generated by update-man-rules.py.
+# Update with:
+#     ninja -C build update-man-rules
+manpages = ['''
+
+MESON_FOOTER = '''\
+]
+# Really, do not edit.
+'''
+
+def make_mesonfile(rules, _dist_files):
+    # reformat rules as
+    # grouped = [ [name, section, [alias...], condition], ...]
+    #
+    # but first create a dictionary like
+    # lists = { (name, condition) => [alias...]
+    grouped = collections.defaultdict(list)
+    for condition, items in rules.items():
+        for alias, name in items.items():
+            group = grouped[(name, condition)]
+            if name != alias:
+                group.append(alias)
+
+    lines = [ [p[0][:-2], p[0][-1], sorted(a[:-2] for a in aliases), p[1]]
+              for p, aliases in sorted(grouped.items()) ]
+    return '\n'.join((MESON_HEADER, pprint.pformat(lines)[1:-1], MESON_FOOTER))
+
+def main():
+    source_glob = sys.argv[1]
+    target = Path(sys.argv[2])
+
+    pages = glob.glob(source_glob)
+    pages = (p for p in pages
+             if Path(p).name not in {
+                     'systemd.directives.xml',
+                     'systemd.index.xml',
+                     'directives-template.xml'})
+
+    rules = create_rules(pages)
+    dist_files = (Path(p).name for p in pages)
+    text = make_mesonfile(rules, dist_files)
+
+    tmp = target.with_suffix('.tmp')
+    tmp.write_text(text)
+    tmp.rename(target)
+
+if __name__ == '__main__':
+    main()