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Date: Fri, 23 May 2014 22:47:01 +0930
Reply-To: Mailing list for the LaTeX3 project <[log in to unmask]>
From: Will Robertson <[log in to unmask]>
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On 23 May 2014, at 6:10 am, Joseph Wright <[log in to unmask]> wrote:

>> Shouldn't we just allow spaces (and leading | or any other system
>> dependent special
>> syntax) just surrounding any user supplied name by " " to keep it together?
> Space behaviour notwithstanding, I think the point here is that the pipe
> input approach is sufficiently different from a 'real' file to deserve a
> separate interface.

One big difference being I think, which Iím stealing from a comment I read recently (sorry for the lack of attribution ó maybe Heiko?), being that MiKTeX explicitly requires a ď-enable-pipesĒ option passed to pdfTeX to function whereas TeX Live permits pipes with -shell-escape.

I could be wrong but I think this is a bit of an issue because shell-escape-being-enabled can be queried within pdfTeX whereas MiKTeX support for pipes canít be. This makes it difficult/impossible (?) to provide an equivalent expl3 interface on all platforms.

Having said all this, I think one reason pipes havenít been used much since their initial inception is a lack of obvious documentation and good user interface. So providing some higher-level support for this functionality could be good incentive to normalise the interface between MiKTeX and TeX Live.