Added to TW-Scripts. On Tuesday, February 26, 2019 at 11:31:52 AM UTC+3:30, Eric Shulman wrote: > > On Monday, February 25, 2019 at 11:18:49 PM UTC-8, S. S. wrote: >> >> I'm having a problem understanding WHY example 2. BREAKS down. >> I did not even know how to give this post an appropriate title! >> I would appreciate if someone could explain it to me. >> > > OK... Let's see if this helps: > > TiddlyWiki macro definitions are NOT functions in the traditional > programming sense. Although input "parameters" can be passed to them, and > they "return" something as a result, they don't actually "run" any of the > "code" they contain. When a macro is invoked, it does two things (and ONLY > two things): > > 1) replace all occurrences of $paramname$ with the corresponding value > that was passed as an input parameter > 2) replace all occurrences of $(variablename)$ with the current value of > the variable (assuming it is defined in the context of the "caller" of the > macro) > > That is ALL it does. After doing the replacements, the resulting content > is "returned". If the macro call is being used as a widget parameter, then > the result is simply passed along to the widget for further processing. > However, if the macro call is embedded directly in wiki content, then it is > rendered. > > In light of the above, when you invoke the following: > 2. BREAKS: <$macrocall $name="test" list-tids=<<get-related-tiddlers>> > field="list" /> > the value of the "list-tids" parameter is simply passed along to the > widget and will NOT be the contents of the list field, but rather will > literally be: > <$view tiddler=SomeTiddlerName field="list" mode="block"/> > > In contrast, when you use <$wikify> on the macro, you are forcing it to be > rendered and then capturing that result in the variable > "GOT-related-tiddlers". Thus, the <$view> widget contained in the macro > DOES get processed, and the result is then available to pass along to the > "list-tids" param. > > Also, I wonder if this use case was the primary reason for making the >> $wikify widget? If not, what was? >> > > I would say it was a convincing reason, though perhaps not the only one. > > hope this helps, > -e > >
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