This has been saved for the 8.4 release:

http://momjian.postgresql.org/cgi-bin/pgpatches_hold

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Dany DeBontridder wrote:
> I often need in command line to get the code of function, so I make a patch
> for pg_dump, thanks this patch pg_dump is able to dump only one functions or
> all the functions.
>
> The argument is --object or -B
>
> Example:
> ./pg_dump -Bfunction:test_it -Bfunction:dblink_open
> To dump the functions test_it, dblink_open
> ./pgdump --object=function or pg_dump -Bfunction to dump only the functions
>
>
> It is possible to add other objects, (see getObject functions)
>
>
> I hope you'll find it interesting.
>
> Regards,
>
> .D.
>
> (patch under BSD licence)

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Bruce Momjian <bruce@momjian.us> http://momjian.us
EnterpriseDB http://www.enterprisedb.com

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TIP 6: explain analyze is your friend