Proposed patch - psql wraps at window width

I've attached a patch, against current 8.4 cvs, which optionally sets a
maximum width for psql output:

# \pset format aligned-wrapped
# \pset border 2
# select * from distributors order by did;
+------+--------------------+---------------------+---------------+
| did | name | descr | long_col_name |
+------+--------------------+---------------------+---------------+
| 1 | Food fish and wine | default | |
| 2 | Cat Food Heaven 2 | abcdefghijklmnopqrs ! |
| | | tuvwxyz | |
| 3 | Cat Food Heaven 3 | default | |
| 10 | Lah | default | |
| 12 | name | line one | |
| 2892 ! short name | short | |
| 8732 | | | |
+------+--------------------+---------------------+---------------+
(8 rows)

The interactive terminal column width comes from
char * temp = getenv("COLUMNS");
Which has the strong advantage of great simplicity and portability. But
it may not be 1000% universal. If $COLUMNS is not defined, the code
bails to assuming an infinitely wide terminal.

I will also backport this to Postgres 8.1, for my own use. Though the
code is almost totally different in structure.

Bryce Nesbitt
City CarShare San Francisco