make-man-rules: add support for generating the list in meson.build format

v2:
- sort the alias array too, otherwise the output is not stable

tools/make-man-rules.py

@@ -3,7 +3,7 @@
 #
 #  This file is part of systemd.
 #
-#  Copyright 2013 Zbigniew Jędrzejewski-Szmek
+#  Copyright 2013, 2017 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
@@ -22,6 +22,7 @@ from __future__ import print_function
 import collections
 import sys
 import os.path
+import pprint
 from xml_helper import *
 
 SECTION = '''\
@@ -66,11 +67,13 @@ EXTRA_DIST += \\
 	{dist_files}
 '''
 
+meson = False
+
 def man(page, number):
-    return 'man/{}.{}'.format(page, number)
+    return ('man/' if not meson else '') + '{}.{}'.format(page, number)
 
 def xml(file):
-    return 'man/{}'.format(os.path.basename(file))
+    return ('man/' if not meson else '') + os.path.basename(file)
 
 def add_rules(rules, name):
     xml = xml_parse(name)
@@ -122,9 +125,40 @@ def make_makefile(rules, dist_files):
         for conditional,rulegroup in sorted(rules.items())
         ) + FOOTER.format(dist_files=mjoin(sorted(dist_files)))
 
+MESON_HEADER = '''\
+# Do not edit. Generated by make-man-rules.py.
+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))
+
 if __name__ == '__main__':
-    rules = create_rules(sys.argv[1:])
-    dist_files = (xml(file) for file in sys.argv[1:]
+    meson = sys.argv[1] == '--meson'
+    pages = sys.argv[1+meson:]
+
+    rules = create_rules(pages)
+    dist_files = (xml(file) for file in pages
                   if not file.endswith(".directives.xml") and
                      not file.endswith(".index.xml"))
-    print(make_makefile(rules, dist_files), end='')
+    if meson:
+        print(make_mesonfile(rules, dist_files))
+    else:
+        print(make_makefile(rules, dist_files), end='')