[PATCH python-hglib] Add feature to allow hglib user to get call backs for prompts and output

[Jordi Gutiérrez Hermoso]

On Thu, 2016-10-06 at 17:52 +0100, Barry A. Scott wrote:
> # HG changeset patch
> # User Barry A. Scott <barry at barrys-emacs.org>
> # Date 1475772736 -3600
> #      Thu Oct 06 17:52:16 2016 +0100
> # Branch hglib-gui-features
> # Node ID 1ac3819a61527836d47f7cd6a113b194c307ffeb
> # Parent  efc527cc43d7394a5bd0deb1d29c4307592f7528
> Add feature to allow hglib user to get call backs for prompts and output.
> 
> Both pull() and push() have had three new, optiomal, aguments added them.

Is this really going to be cluttering the output of `hg help
pull/push`? The longer that gets, the less likely users are to read
it.

Indiscriminately growing new options on Mercurial commands, especially
for very niche uses, is very undesirable.