\doifanydefinedelse, \doifallundefinedelse

\doifanydefinedelse, \doifallundefinedelse

[Joey McCollum via ntg-context]

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I was checking the "Branches and Decisions" wiki entry at
https://wiki.contextgarden.net/System_Macros/Branches_and_Decisions, and I
saw that ConTeXt has a useful \doifalldefinedelse macro that checks a
comma-separated list of macro names and proceeds according to whether or
not all of the macros with those names are defined. I was curious as to
whether or not there is also a \doifanydefinedelse (or, equivalently, a
\doifallundefinedelse) macro that would check if *any *of the macros with
names in the comma-separated list is defined (or, equivalently, if all of
them are undefined). I don't see any mention of such a macro on the wiki
page, so I wanted to ask: has something like this already been implemented,
and if not, is there a simple way to do a check like this? This
functionality would be useful for performing some checks on a key-value
assignment, and passing a comma-separated list to a macro would be much
cleaner than doing a bunch of nested if-else blocks.

Joey

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Re: \doifanydefinedelse, \doifallundefinedelse

[Hans Hagen via ntg-context]

On 11/19/2021 4:26 PM, Joey McCollum via ntg-context wrote:
> I was checking the "Branches and Decisions" wiki entry at 
> https://wiki.contextgarden.net/System_Macros/Branches_and_Decisions 
> <https://wiki.contextgarden.net/System_Macros/Branches_and_Decisions>, 
> and I saw that ConTeXt has a useful \doifalldefinedelse macro that 
> checks a comma-separated list of macro names and proceeds according to 
> whether or not all of the macros with those names are defined. I was 
> curious as to whether or not there is also a \doifanydefinedelse (or, 
> equivalently, a \doifallundefinedelse) macro that would check if /any 
> /of the macros with names in the comma-separated list is defined (or, 
> equivalently, if all of them are undefined). I don't see any mention of 
> such a macro on the wiki page, so I wanted to ask: has something like 
> this already been implemented, and if not, is there a simple way to do a 
> check like this? This functionality would be useful for performing some 
> checks on a key-value assignment, and passing a comma-separated list to 
> a macro would be much cleaner than doing a bunch of nested if-else blocks.
i'll add \doifelseallundefined

btw, you don't need to nest if's in lmtx:

\ifdefined\foo
\orelse\ifdefined\ofo
\orelse\ifdefined\oof
\else
\fi

sort of stays on the same level ... makes tex bit more like other 
programming languages (but of course also makes macros less impressive)

Hans

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