doc: fix doxygen-link.py by skipping invalid entries in libnl.dict

Newer versions of doxygen (on Fedora20) treat the documentation
slightly different so that the following entires end up in
libnl.dict:

    \=api/group__attr.html#ga769cc7bd882aab17c3740dd83329d7e6
    »·······»·······NLA_PUT=api/group__attr.html#ga769cc7bd882aab17c3740dd83329d7e6
    NLA_PUT=api/group__attr.html#ga769cc7bd882aab17c3740dd83329d7e6

Especially, replacing r'\' breaks the generated html documentation.
Extend doxygen-link.py to strip whitespaces from the name and
skip over r'\'.

Also, when replacing the words in the output file, match them
using word boundaries r'\b'.

Also, don't print an additional newline after each processed line.

Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Thomas Haller <thaller@redhat.com>

doc/doxygen-link.py

@@ -1,20 +1,43 @@
 #!/usr/bin/env python
 
+from __future__ import print_function
 import fileinput
 import re
 import sys
 
-links = {}
 
-for line in open(sys.argv[1], 'r'):
-	m = re.match('^([^=]+)=([^\n]+)$', line);
-	if m:
-		link = "<a href=\"" + m.group(2) + "\" class=\"dg\">" + m.group(1) + "</a>"
-		links[m.group(1)] = link
+rc_script = re.compile(r'\s*(.*\S)?\s*')
+
+def parse_dict(filename):
+	links = {}
+	for line in open(filename, 'r'):
+		m = re.match('^([^=]+)=([^\n]+)$', line);
+		if not m:
+			continue
+		name = m.group(1)
+		value = m.group(2)
+
+		# strip leading and trailing whitespace
+		m = rc_script.match(name)
+		if m:
+			name = m.group(1)
+
+		# skip special names
+		if name == '':
+			continue
+		if name == '\\':
+			continue
+
+		links[name] = "<a href=\"" + value + "\" class=\"dg\">" + name + "</a>"
+	return links
+
+links = parse_dict(sys.argv[1])
 
 def translate(match):
-	return links[match.group(0)]
+	return links[match.group(1)]
+
+# match for all names, with word boundaries \b
+rc = re.compile(r'\b(' + '|'.join(map(re.escape, sorted(links, reverse=True))) + r')\b')
 
-rc = re.compile('|'.join(map(re.escape, sorted(links, reverse=True))))
 for line in open(sys.argv[2], 'r'):
-	print(rc.sub(translate, line))
+	print(rc.sub(translate, line), end='')