Use open4 for execute command.

[alloy]

No description provided.

[mikz]

@alloy do you remember why?

[alloy]

This must be the worst ticket I have made in my life. Sorry about that.

I think this is because of having one solid way on all Rubies to be able to do properly synced stdout & stderr output to the terminal (i.e. not only once the command ends execution) and also buffer that output. Starting from MRI 1.9 the Spawn mod has some good options, but those are not available on MRI 1.8.7 which shipped with OSX 10.8.x.

[Manfred]

Yes, this was because of two reasons.

1. Stop buffering output, instead immediately stream it to the terminal (see Utils#_execute)
2. Support both stdout and stderr at the same time