~bzr-pqm/bzr/bzr.dev

Commentary on UIs

added added

removed removed

depending on the detected capabilities of the terminal.

"""

# Previously, there was CLIUIFactory for dumb terminals, and TextUIFactory for

# those on smarter terminals. However, there are actually a few independent

# variables so simple subclassing doesn't make sense. The user may or may not

# want progress bars, but even if they want them off they may want a rich

# interface in other ways. And on the other hand input may be redirected from

# a file so stdin is not a terminal, but we should still try to read input

# from it and display progress bars etc. Therefore if we're doing a text UI

# at all, we just use TextUIFactory and it turns some features on or off

# depending on the detected settings and capabilities.

# We also use this factory for most blackbox tests, but typically with non-tty

# streams and TERM=dumb. For api tests, SilentUIFactory is probably

# appropriate.

# GUIs may actually choose to subclass TextUIFactory, so unimplemented methods

# fall back to working through the terminal.

import os

import sys

import warnings