Quick little \h enhancement for psql

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Attached is a patch that enhances the "\h" capability in psql. I often
find myself typing a command and then wanting to get the syntax for
it. So I do a ctrl-a and add a \h: but psql does not recognize the
command, because I have stuff attached to it (e.g. "alter table
foobar"),
so I have to scroll over and delete everything except the name of the
command itself. This patch gives \h three chances to match: if nothing
matches the complete string (current behavior), it tries to match the
first two words (e.g. "ALTER TABLE"). If that fails, it tries to match
the first word (e.g. "DELETE").

- --
Greg Sabino Mullane greg(at)turnstep(dot)com
PGP Key: 0x14964AC8 200505161840
http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
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