Bug#953527: [apt] colour highlighted error/warn labels

[Julian Andres Klode <jak@debian.org>]

On Tue, Mar 24, 2020 at 08:09:24PM +0000, jnqnfe@gmail.com wrote:
> Hi, Julian,
> 
> Thanks for adding the colour support in apt 2.0.1.
> 
> I'm curious though, most implementations use isatty() to determine the
> default colour control setting, which it seems that your implementation
> lacks, instead only outputting colour when explicitly enabled via `-o
> APT::Color=true`.
> 
> Was it a deliberate decision to not make use of isatty() to determine a
> default?

That's how it works, apt(8) sets APT::Color to true by default, and the
code sets it to false if stdout is not a tty. Which it already did before,
as you can see in apt list, for example.

As is customary, for compatibility reasons, apt-get(8) and apt-cache and 
friends do not change behavior.

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