I'm glad my question has led to something useful for others. Unfortunately, my original question has not been answered. Is there any way to use Jeremy's new subfilter to display an error message if a specified macro is undefined? (Thanks, Mal, for your efforts.)
Alternately, if it is still not possible, even with the new subfilter, I'd appreciate having that confirmed. David. On Wed, 27 Feb 2019 at 00:31, Mohammad <[email protected]> wrote: > Thanks for clarification! > > --Mohammad > > On Tuesday, February 26, 2019 at 3:38:07 PM UTC+3:30, Jeremy Ruston wrote: >> >> Hi Mohammad >> >> The reason that we don’t use the “[<macro>]” formulation here is because >> we don’t want to retrieve the value of the macro, we want to get its name >> as a string. >> >> Best wishes >> >> Jeremy >> >> On 26 Feb 2019, at 11:57, Mohammad <[email protected]> wrote: >> >> Hello again Jeremy, >> >> Look at below code >> >> \define macro(VAR_NAME) >> test >> \end >> >> <$list filter="[[macro]] +[is[variable]addsuffix[ is a variable]] >> ~[[Undefined variable or macro 'VAR_NAME']]"> >> <<currentTiddler>> >> </$list> >> >> >> Why the syntax needs variable like Tiddler title, I expect to have macro >> or variable as below >> >> >> <$list filter="[<macro>] +[is[variable]addsuffix[ is a variable]] >> ~[[Undefined variable or macro 'VAR_NAME']]"> >> <<currentTiddler>> >> </$list> >> >> I mean, using angle bracket. >> >> --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/#$:/AdvancedSearch> >>> >>> Best wishes >>> >>> Jeremy. >>> >>> On 25 Feb 2019, at 20:49, David Nebauer <[email protected]> wrote: >>> >>> Thanks, Jeremy. For future reference, would you mind showing how that >>> subfilter could be used to test for the existence of a particular variable >>> or macro, say 'VAR_NAME', and display the text "Undefined variable or macro >>> 'VAR_NAME'" if it is not found. >>> >>> -David >>> >>> On Monday, 25 February 2019 22:39:23 UTC+9:30, Jeremy Ruston wrote: >>>> >>>> Hi David >>>> >>>> I think you’re right: there is no way to test for the existence of a >>>> variable whose value is blank. I’ve added an [is[variable]] subfilter >>>> operator for v5.1.20 to address this: >>>> >>>> >>>> https://github.com/Jermolene/TiddlyWiki5/commit/36e76429b1a1d4638374d513430393db5693b932 >>>> >>>> Best wishes >>>> >>>> Jeremy. >>>> >>>> >>>> On 25 Feb 2019, at 12:34, David Nebauer <[email protected]> wrote: >>>> >>>> As I understand it, if you attempt to call an undefined macro the call >>>> fails silently, with nothing displaying in the tiddler to alert users. This >>>> occurs regardless of the calling method, i.e., >>>> >>>> <<not-a-real-macro>> >>>> or >>>> <$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 tiddlywiki+...@googlegroups. <http://googlegroups.com/>com >>>> <http://googlegroups.com/>. >>>> 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]. >>> 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/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/6c5462a8-99ad-4133-86f3-199b3ac66737%40googlegroups.com >> <https://groups.google.com/d/msgid/tiddlywiki/6c5462a8-99ad-4133-86f3-199b3ac66737%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 a topic in the > Google Groups "TiddlyWiki" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/tiddlywiki/4rEuAWc4EpM/unsubscribe. > To unsubscribe from this group and all its topics, 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/4580fe7a-9855-428b-8246-2ea56bcc2fae%40googlegroups.com > <https://groups.google.com/d/msgid/tiddlywiki/4580fe7a-9855-428b-8246-2ea56bcc2fae%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. 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