How to recursively traverse all child tiddlers using the function pragma?

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#1

Hi everyone,

Suppose we have a task called [[Meeting with friends]]. This task can be split into several subtasks (children), and each subtask can in turn be split into further subtasks.

When a subtask is created, its parent field is set to the title of its parent task. Given this structure, how can I recursively traverse all subtasks of a task using TiddlyWiki’s function pragma?

I’ve already found a way to recursively traverse all child tiddlers using a procedure, and it works correctly. However, it doesn’t feel very elegant to me. Ideally, I’d like to achieve the same result using a function pragma instead.

Does anyone have suggestions or examples for doing this with function?

Here is the procedure-based approach I’m currently using to traverse all child tiddlers:

\procedure travel-recurse(root)
\function get-formatted-title() [<currentTiddler>format:titlelist[]]
<$list filter="[parent<root>]">
	<<get-formatted-title>>
	<$transclude $variable="travel-recurse" root=<<currentTiddler>>/>
</$list>
\end

<$wikify name="tasks-list" text="""<$transclude $variable="travel-recurse" root="Meeting with friends"/>""">
	<ul>
		<$list filter="[enlist<tasks-list>]">
			<li>
				<$link to=<<currentTiddler>>>
					<<get-task-caption>>
				</$link>
			</li>
		</$list>
	</ul>
</$wikify>

I’ve also created a complete demo site for this question, which you can test directly at :point_right: https://com.tiddlyhost.com/.

#2

You could have a look how my tocP plugin macros are created

#3

Hi, thank you for the suggestion. However, it doesn’t quite fit my use case.
The example is implemented entirely with the define macro, while I’m trying to solve this problem using a function pragma.

More specifically, I’m looking for a way to recursively traverse all child tiddlers using only filter expressions.

#4 
\function recurse.with.self(t) [<t>] [.recurse<t>]

\function .recurse(t) [all[tiddlers]parent<t>] :map:flat[recurse.with.self<currentTiddler>]

{{{ [recurse.with.self[Meeting with friends]] }}}

The above is untested but should point you in the right direction.

3 Likes
#5

Thanks for your reply — that’s exactly the answer I was looking for. This is awesome!