Re: new trickery

[Hans Hagen <pragma@wxs.nl>]

On 3/15/2013 6:16 PM, Jonathan Barchi wrote:
> On Fri, Mar 15, 2013 at 4:35 AM, Hans Hagen <pragma@wxs.nl> wrote:
>> On 3/15/2013 5:18 AM, Idris Samawi Hamid ادريس   سماوي حامد wrote:
>>>
>>> On Thu, 14 Mar 2013 20:08:38 -0600, Idris Samawi Hamid ادريس   سماوي
>>> حامد <ishamid@colostate.edu> wrote:
>>>
>>>> To round it off I guess we need a replacement for \subfs as well.
>>>
>>>
>>> Hmm, it seems that \subfs functionality is built in through the same
>>> mechanism. Will study this some more...
>>
>>
>> yes, but there in successive calls the last one counts
>>
>> \addff{x} \addff{y} \addff{z}  -> z is used on top of the current font's set
>>
>> \feature{x} \feature{y} \feature{y} -> all are used on top
>>
>> we might end up with replacing \addff etc by one mechanisms
>>
>> \feature{+someset} : add
>> \feature{-someset} : subtract
>> \feature{=someset} : replace
>>
>
> I like this proposal for its use of only a single command with the
> add/remove/reset in the args. If \feature ends up being too generic,
> maybe \fontfeature or \fontfeatureset instead?
>
> To keep things more in-line with current ConTeXt syntax, you could do
> something like the following:
>
> \feature{add=foo}
> \feature{subtract=bar}    (or sub, remove, etc.)
> \feature{reset,add=baz}
>
> Which would also allow, e.g.,
>
> \feature{add=bar,remove=baz}

I'd like to avoid parsing as much as possible here as these are state 
changers. So, I made:

\addfeature     [f:mine] \feature[more][f:mine] \feature[+]      [f:mine]
\subtractfeature[f:mine] \feature[less][f:mine] \feature[-]      [f:mine]
\replacefeature [f:mine] \feature[new] [f:mine] \feature[=]      [f:mine]
\revivefeature  [f:mine] \feature[old] [f:mine] \feature[default][f:mine]
\resetfeature            \feature[reset]

so there are several ways to achieve the same (and one can use {} 
instead of [])

> similar to how we're used to using key:value pairs in so many
> arguments, and being able to combine them in one function call.

Hans

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