Add psycopg2.extensions.quote_ident.

[a1exsh]

@dvarrazzo how about this way? #308

The compose stuff looks nice, but I only need something really simple and straightforward for #322: https://github.com/psycopg/psycopg2/pull/322/files#diff-e6256dfa32f9bced2faae91403f4d594R487

[dvarrazzo]

I'm fine with it, I can merge it, but I would like to see unicode and Py3 tests.

What does the function return? str or unicode? what on py3? I think it should take both input, encode unicode in the connection encoding (use psycopg_ensure_bytes()) and I think it should always emit bytes, but py3 guys may not agree, they like useless encoding/decoding roundtrips, so probably conn_text_from_chars() is the right choice, yes, but I would like to see it checked in the test suite.

More notes on the way...

[dvarrazzo]

I'm happy to merge this changeset to help you with your work on the streaming replication branch. Of course if we end up improving the quote_ident support as discussed in #308 we can refactor streaming replication to use the new method.

[a1exsh]

Thank you! Will update to address the comments.

[a1exsh]

Please see zalando-stups@89bb6b0

[dvarrazzo]

Thank you, that was exactly what I expected.

Good luck with the replication stuff :)

[a1exsh]

Cool, many thanks! :)