Re: Bad interaction between new interpretation of underscore and modules

[Mathieu Boespflug <mboes@tweag.net>]

Hi Wolfgang,

thank you for the explanation and the solution.

Best,

Mathieu

On Fri, Jan 14, 2011 at 10:32 AM, Wolfgang Schuster
<schuster.wolfgang@googlemail.com> wrote:
>
> Am 14.01.2011 um 10:15 schrieb Mathieu Boespflug:
>
>> Thank you for the solution, Wolfgang.  But it seems rather painful to
>> have to replace every occurrence of _ in my definitions module with
>> the very verbose \normalsubscript just because it's a module. The new
>> default catcode for _ introduces extra difficulty when defining math
>> macros. Would it be possible to at least have a macro to revert to the
>> old behaviour? Also, I'm still stumped as to why modules make any
>> difference here. I would have expected this problem to also show up if
>> the definitions were made inline at the top of the source file for the
>> document.
>
> When you write a module you put \unprotect and \protect at the begin and
> end of the file because they make @, !, ? and _ to a normal letter like abc
> which can be used in macros. When you load a file with \usemodule or
> \environment this isn’t necessary because context adds already calls
> both commands when the file is opened and closed for reading and this
> mechanism is used even if you aren’t aware of this.
>
> PS  For \environment this is only true when you use it in a document
> with \starttext or when you write it before \startproduct, \startcomponent etc.
>
> PPS  You can abuse \nonknuthmode to make your module to work
>
> \startbuffer[definitions]
> \pushcatcodes\nonknuthmode % \startnonknuthmode
> \def\lambdax{\lambda_x}
> \popcatcodes               % \stopnonknuthmode
> \stopbuffer
>
> \savebuffer[definitions][p-definitions.tex]
>
> \startbuffer[more]
> \def\morex{\more_x}
> \stopbuffer
>
> \savebuffer[more][p-more.tex]
>
> \usemodule[definitions,more]
>
> \starttext
> blah $\lambdax$ blah. \morex
> \stoptext
>
> Wolfgang
>
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