[IPython-dev] Deprecating the IPython Color* API & IPython Theming

Matthias Bussonnier bussonniermatthias at gmail.com
Tue Nov 10 03:33:19 EST 2015

Hi Aaron,

> On Nov 9, 2015, at 23:09, Aaron Meurer <asmeurer at gmail.com> wrote:
> I hope you also take this opportunity to make it easier for people to
> customize their prompts.
> You have to go through some silly hoops
> (which IIRC aren't really documented) to make the prompt execute some
> code every time it is displayed, which is necessary to do things like
> put the date or cwd in your prompt.

Maybe not in the same PR, cwd and date should have custom markers
to make that easier. 

> I also found it annoying that I
> couldn't just inject something into some dictionary (I forget which at
> this point) because in IPython's type system dictionaries are
> immutable for some reason.

Now that IPython can have dependencies, I things one can use Jinja2, 
or other templating library to simplify prompts.

> I also want to say that I'm stoked that IPython is finally getting
> proper theming support in the terminal.

Well, I helped fixing a syntax highlighting bug, and slippery slope...
this was not really on the roadmap...

Might take some times to be released as is touch some pretty deep part of IPython though.


> Aaron Meurer
> On Tue, Nov 10, 2015 at 12:02 AM, Matthias Bussonnier
> <bussonniermatthias at gmail.com> wrote:
>> Hello list,
>> TL;DR:
>> Who is relying on IPython.utils.Pycolorize.Parser, and other ColorAnsi
>> functionality ?
>> I’m wondering if/how much deprecation time and backward compatibility is
>> needed.
>> Are you using “Embed” in esoteric ways (like through pexpect/subprocess ?)
>> Please speak now.
>> Longer version
>> Hi all, I’m working on refactoring all the ANSI code handling of IPython[1].
>> Some code in here is more than a decade old, and have a lot a redundant
>> code, which often now
>> is available with a better API[2] in libraries like Pygments.
>> This part of the code also deals with prompt formatting Because yes you can
>> put CWD,
>> and date in IPython prompt if you like, and in color, and it is relatively
>> annoying to keep compatibility with old and new API
>> at the same time.
>> So are any of you heavy users of the API in these region of the code base ?
>> If so can you point me at your usage, so that I could make the migration to
>> the new API
>> easier in your use case ?
>> Also if you are using IPython-embed through Expect or subprocess and alike,
>> the new ASCII escape sequence
>> might break previously made assumptions, I want to make sure these are not
>> broken either.
>> Thank you for reading me until the end, here is a gif[3][4] of the potential
>> new IPython themes as a reward.
>> --
>> [1] https://github.com/ipython/ipython/pull/8966
>> [2] well, mostly, the naming of ascii color is discutable.
>> [3]
>> https://twitter.com/Mbussonn/status/663953838521520128?cn=cmV0d2VldA%3D%3D&refsrc=email
>> [4] It’s pronounced Jif not Gif:
>> http://mashable.com/2014/07/16/how-to-say-gif/#FQuOGTRNREqp
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