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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