[IPython-dev] magics and metadata

MinRK benjaminrk at gmail.com
Tue Jun 19 15:21:49 EDT 2012

On Tue, Jun 19, 2012 at 12:05 PM, Jonathan Taylor <
jonathan.taylor at stanford.edu> wrote:

> That's the sort of use case I imagine as well, where a cell magic wants
> to about something to the frontend a little more information about what
> kind of cell it is (in your %%bash example, it would be a code cell for
> which the code_mirror might use bash highlighting instead of python). This
> seems like it could be accomplished with something parallel to
> "publish_display_data" for cell metadata which different frontends can
> handle differently.

publish_display_data already takes a metadata arg.  This has always been
the case, but so far it's totally unused.

I just noticed, this metadata is *not* included in the added fields
preserved in the notebook, but I will get on that.


> On Tue, Jun 19, 2012 at 8:49 AM, Thomas Kluyver <takowl at gmail.com> wrote:
>> On 19 June 2012 16:08, Jonathan Taylor <jonathan.taylor at stanford.edu>
>> wrote:
>> > Yes, it would not be good to have the API of cell magics be notebook
>> > specific. What about providing a reference to the current cell metadata
>> in
>> > the Magics class that can be used to update the NotebookNode after
>> executing
>> > cell.input? So, cell_magics would not have access to the metadata on
>> > execution but could pass any metadata it wanted to back to the notebook.
>> Before we get too far into the mechanism, let's try to think about
>> actual use cases, so we can figure out how things need to work.
>> We can also see cell magics themselves as a sort of within-cell
>> metadata. For example, the frontend might one day be aware that if a
>> cell starts with %%bash, different syntax highlighting and tab
>> completion rules apply to it. I think this would need to be within the
>> frontend, rather than going through the kernel, because we want to use
>> the new highlighting & completion before the cell is executed.
>> Thomas
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> --
> Jonathan Taylor
> Dept. of Statistics
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