I suspect your usage would break the spirit of the JS rules, since it's
using a macro to change TW content.
But you could write a non-JS (i.e.wikitext) macro that would basically do
the same thing. If the tiddler doesn't exist, it would show a button which,
when clicked on, would create the tiddler. A button can be disguised as a
link, if that's important to you.
On Saturday, December 12, 2020 at 11:29:44 AM UTC-8 Leung arvin wrote:
> I wish to implement the following functionality, using JS macro, defining
> the macro with name M.
>
> Whenever I use a macro <<M tiddler_name : "New Tiddler">> , then it
> creates a Tiddler with title "New Tiddler". Then the macro presents this
> link [[New Tiddler]]. The point is that the macro will create the Tiddler
> for me (with some starting content , customisable in JS) if none have
> already been created.
>
> Example code would be:
>
> function run(tiddler_name){
> - Check if wiki has tiddler with title tiddler_name
> - If not, create a tiddler of title tiddler_name and content "default
> content"
> - Return [[tiddler_name]]
> }
>
> I would like to know if this is safe. The documentation states:
>
> "Macros are just used to return a chunk of wikitext for further
> processing. They should not make modifications to tiddlers in the wiki
> store. The reason is that you cannott control when the macro is called; it
> may be called repeatedly as part of refresh processing. So it is important
> that macros do not have any other side effects beyond generating their
> text."
>
> So this would break the no side effect rule. However, the idempotent
> design means that subsequent calls to this macro should not have any side
> effects.
>
> Will this potentially break stuff in unknown ways? I would also like to
> know if there are other methods to achieve the same tasks in JS.
>
>
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