Can we support apt's funky ANSI escapes?

[Clément Pit--Claudel]

Hi emacs-devel,

Ubuntu has a new wrapper around apt-get and apt-search called apt. As it runs 
it displays a progress bar, whose ANSI escapes confuse ‘M-x shell’; here's an 
example:

    Removing libacl1-dev (2.2.52-3) ...
    ^[7Progress: [  0%] 
[................................................................................................]
 ^[8^[7Progress: [ 25%] 
[########################........................................................................]
 ^[8^[7Progress: [ 50%] 
[################################################................................................]
 ^[8^[7Progress: [ 75%] 
[########################################################################........................]
 ^[8Processing triggers for man-db (2.7.5-1) ...

    ^[7^[[0;62r^[8^[[1A^[[J

And here's another one:

    ^[7^[[0;61r^[8^[[1ASelecting previously unselected package libacl1-dev.
    (Reading database ... 359142 files and directories currently installed.)
    Preparing to unpack .../libacl1-dev_2.2.52-3_amd64.deb ...
    ^[7Progress: [  0%] 
[................................................................................................]
 ^[8^[7Progress: [ 16%] 
[#################...............................................................................]
 ^[8Unpacking libacl1-dev (2.2.52-3) ...
    ^[7Progress: [ 33%] 
[#################################...............................................................]
 ^[8^[7Progress: [ 50%] 
[################################################................................................]
 ^[8Processing triggers for man-db (2.7.5-1) ...
    Setting up libacl1-dev (2.2.52-3) ...
    ^[7Progress: [ 66%] 
[#################################################################...............................]
 ^[8^[7Progress: [ 83%] 
[################################################################################................]
 ^[8
    ^[7^[[0;62r^[8^[[1A^[[J

Is this a bug that should be fixed on the ‘apt’ side (it shouldn't show the 
progress bar?), or can we support these escapes?

Clément.

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