On Wednesday, January 6, 2016 at 11:31:51 AM UTC-8, Abraham Neben wrote:
>
> I want to loop over all task types (I have tiddler's called "home", and
> "work", each tagged as "tasktype"), and for each one, list the names of all
> tiddlers of that type also tagged as "task".
>
You could use nested lists, like this:
<$list filter="[!has[draft.of]tag[tasktype]]" variable="tasktype">
<$list filter="[!has[draft.of]tag[task]!tag[done]tag<tasktype>
sort[created]]">
<$checkbox tag="done"> <$link to={{!!title}}><$view
field="title"/></$link></$checkbox>
</$list>
</$list>
* the outer <$list> loops over all tasktypes (i.e., "home", "work" etc.)
and sets the variable, "tasktype"
* the inner <$list> loops over all tasks that are not done that are also
tagged with the current task tasktype.
Note the angle brackets in the "tag<tasktype>" syntax is what allows you to
use a variable value -- rather than the usual literal text -- as the
operand of the tag[] filter. Also, using a named variable in the <$list>,
instead of the default "currentTiddler", makes the overall meaning of the
filter easier to understand.
One more "code style" tip that I sometimes use in my own projects: instead
of putting filters and $list contents "inline", it can help to separate the
parts into named macros, and then use those macros in the $list widgets.
This approach can make it much easier to understand the code, since it
isolates some of the complex syntax and gives them symbolic names that help
to emphasize their purpose. For example, the previous code could be
written this way:
\define types() [!has[draft.of]tag[tasktype]]
\define tasks() [!has[draft.of]tag[task]!tag[done]tag<tasktype>sort[created
]]
\define link() <$link to={{!!title}}><$view field="title"/></$link>
\define check() <$checkbox tag="done"> <<link>></$checkbox>
<$list filter=<<types>> variable="tasktype">
<$list filter=<<tasks>>>
<<check>>
</$list>
</$list>
While this coding style is not as compact, it is much more readable, as
well as making it easier to do things like change the filter definitions or
the output format. For example, you could add a "priority" field to your
task tiddlers, and then then simply change this one line:
\define tasks() [!has[draft.of]tag[task]!tag[done]tag<tasktype>sort[priority
]]
without having to find the right place buried "inline" in the nested $list
syntax.
enjoy,
-e
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