Jeremy! Is it possible to use this operator for checking if the parameter has been passed to a macro or not!
--Mohammad On Tuesday, February 26, 2019 at 12:25:58 AM UTC+3:30, Jeremy Ruston wrote: > > Hi David > > Try: > > [[VAR_NAME]] +[is[variable]addsuffix[ is a variable]] ~[[Undefined > variable or macro 'VAR_NAME']] > > [[currentTiddler]] +[is[variable]addsuffix[ is a variable]] ~[[Undefined > variable or macro ‘currentTiddler']] > > You can try out these examples in the “filter” tab of advanced search in > the prerelease: > > https://tiddlywiki.com/prerelease/#%24%3A%2FAdvancedSearch > <https://tiddlywiki.com/prerelease/#$:/AdvancedSearch> > > Best wishes > > Jeremy. > > On 25 Feb 2019, at 20:49, David Nebauer <[email protected] <javascript:>> > wrote: > > Thanks, Jeremy. For future reference, would you mind showing how that > subfilter could be used to test for the existence of a particular variable > or macro, say 'VAR_NAME', and display the text "Undefined variable or macro > 'VAR_NAME'" if it is not found. > > -David > > On Monday, 25 February 2019 22:39:23 UTC+9:30, Jeremy Ruston wrote: >> >> Hi David >> >> I think you’re right: there is no way to test for the existence of a >> variable whose value is blank. I’ve added an [is[variable]] subfilter >> operator for v5.1.20 to address this: >> >> >> https://github.com/Jermolene/TiddlyWiki5/commit/36e76429b1a1d4638374d513430393db5693b932 >> >> Best wishes >> >> Jeremy. >> >> >> On 25 Feb 2019, at 12:34, David Nebauer <[email protected]> wrote: >> >> As I understand it, if you attempt to call an undefined macro the call >> fails silently, with nothing displaying in the tiddler to alert users. This >> occurs regardless of the calling method, i.e., >> >> <<not-a-real-macro>> >> or >> <$macrocall $name="not-a-real-macro"/> >> >> *Is there a technique for checking whether a macro is defined, and >> displaying a message in the tiddler if the macro is not defined?* >> >> Ideally, the test would not just check for *output* from the macro, >> since there might be valid circumstances where a macro produces no output. >> >> -David >> >> -- >> You received this message because you are subscribed to the Google Groups >> "TiddlyWiki" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at https://groups.google.com/group/tiddlywiki. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/tiddlywiki/1ecc0c93-5932-41bb-9634-3eca9daf26c1%40googlegroups.com >> >> <https://groups.google.com/d/msgid/tiddlywiki/1ecc0c93-5932-41bb-9634-3eca9daf26c1%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> >> >> > -- > You received this message because you are subscribed to the Google Groups > "TiddlyWiki" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > To post to this group, send email to [email protected] > <javascript:>. > Visit this group at https://groups.google.com/group/tiddlywiki. > To view this discussion on the web visit > https://groups.google.com/d/msgid/tiddlywiki/49d883c4-f2f7-434b-aaf7-5b1f0d21a29b%40googlegroups.com > > <https://groups.google.com/d/msgid/tiddlywiki/49d883c4-f2f7-434b-aaf7-5b1f0d21a29b%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > > > -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/19918c87-0d56-4ecf-b057-4aff3147a724%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
