drake doesn't preserve terminal connected to stdio

[lbeschastny]

Drake executes all tasks without a terminal (piping stdio).

For example, consider the following Drakefile:

%tty <-
  tty
  exit 0

Even if I'll run drake from a terminal it'll print not a tty:

$ echo "Terminal: `tty`" && drake -a %tty
Terminal: /dev/pts/0
Running 1 steps with concurrence of 1...

--- 0. Running (via tag): %tty <- 
not a tty
--- 0: %tty <-  -> done in 0.18s
Done (1 steps run).

Many utilities behave in a different manner depending whether their stdout is connected to a terminal or to a pipe.
For example, most utilities use colors and progress reporting only when printing to some terminal.