can't redirect with -w

[gelisam]

Okay, this is really strange, and I have no idea how we can be causing this.

Usually, everything we print can equivalently be redirected into a file:

> hawk [1..3] > out
> cat out
1
2
3
> hawk [1..3]
1
2
3

But with the flag -w, this doesn't work?!

> printf "1 2 3\n4 5 6\n7 8 9" | hawk -w 'reverse' > out
> cat out
> printf "1 2 3\n4 5 6\n7 8 9" | hawk -w 'reverse'
3       2       1
6       5       4
9       8       7

An example with -l, to show that this is really unique to -w:

> printf "1 2 3\n4 5 6\n7 8 9" | hawk -l 'reverse' > out
> cat out
7 8 9
4 5 6
1 2 3
> printf "1 2 3\n4 5 6\n7 8 9" | hawk -l 'reverse'
7 8 9
4 5 6
1 2 3

[melrief]

Also -m suffers the same problem. Honestly, I don't know what the hell is going on, but the problem is probably in how hawk splits the lines.

[melrief]

Found the bug, I'm testing my fix.

[melrief]

Ok I have pushed a new version which flush stdout at the end. It seems to work (your example at least). I still don't have any explanation on why we need to flush stdout only when redirecting...but luckily the first thing that I try when something is not printed in output by a Haskell program is flushing.