[PATCHES] \prompt for psql

[Chad Wagner]

This adds the ability to "prompt" for internal variable input, below are
examples:

test=# \prompt x
Enter value for "x": 3
test=# select * from foo where x = :x;
x
---
3
(1 row)

test=# \prompt x Enter x:
Enter x: 4
test=# select * from foo where x = :x;
x
---
4
(1 row)



====

The input is limited to 4k, should be reasonable enough.  Patch is against
CVS HEAD.

psql_prompt.diff
Description: Binary data

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