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+when writing an external plugin using `proxy.py`, the getstate and setstate
+functions don't accept unicode data:
+
+ uncaught exception: 'ascii' codec can't encode character u'\xe4' in position 25: ordinal not in range(128)
+ Traceback (most recent call last):
+ File "proxy.py", line 309, in run
+ self._in_fd, self._out_fd)
+ File "proxy.py", line 192, in handle_rpc
+ ret = self._dispatcher.dispatch(method, params)
+ File "proxy.py", line 84, in dispatch
+ return self._dispatch(method, params)
+ File "/usr/lib/python2.7/SimpleXMLRPCServer.py", line 420, in _dispatch
+ return func(*params)
+ File "proxy.py", line 251, in hook_proxy
+ ret = function(self, *args)
+ File "/home/chrysn/git/ikiwiki-plugins//plugins/my_plugin", line 49, in data2html
+ proxy.setstate(kwargs['page'], 'meta', 'title', unicode_containing_umlauts)
+ File "proxy.py", line 291, in setstate
+ return self.rpc('setstate', page, id, key, value)
+ File "proxy.py", line 233, in rpc
+ *args, **kwargs)
+ File "proxy.py", line 178, in send_rpc
+ cmd, data))
+ UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in position 25: ordinal not in range(128)
+
+the culprit is the last `_debug_fn` invocation in `send_rpc` (line 178), where
+unicode data is format-fed into a string. while this could be circumvented by
+making the formatting string a unicode string, that would cause trouble with
+python3 and we'd just move the problem to the stderr writing later on; instead,
+"`cmd, data))`" should become "`cmd, repr(data)))`" and everything is fine.
+debug output doesn't look that pretty any more, but is safe.
+
+--[[chrysn]]
+
+> ok, [[done]] --[[Joey]]