The quick version is that I want to propose an extension to the normal
filter syntax to allow defining variables and have multiple filters in one
filter string. filters are separated by commas (,) and variables are
assigned, similar to how the set widget defines them, using ->. One filter
can be assigned to a variable that is then used in later filters in the
filter string.
The long version is:
As part of my WikiDB project I needed a way to make more complex filters
using only one string than you can using tiddlywiki so I added some
extensions to the filter parser I wrote for the database that may be worth
considering for the core.
The database is written in Julia so I don't have any demo for this.
The extensions let you define variables and multiple filters in the same
string.
The string
[tag[a]] -> 1, [tag[b]] -> 2, [tag<1>tag<2>]
Is roughly equivalent to
<$list filter='[tag[a]]' variable=1>
<$list filter='[tag[b]]' variable=2>
<$list filter='[tag<1>tag<2>]'>
</$list>
</$list>
</$list>
but in my version the output is all concatenated into one list so it could
be sorted or have the duplicated removed, instead of a bunch of lists
inside the inner widget.
You could also have multiple filters at the output
[tag[a]] -> 1, [tag[b]] -> 2, [tag<1>tag<2>], [field:foo[bar]]
which is the displayed output from this, but in one list:
<$list filter='[tag[a]]' variable=1>
<$list filter='[tag[b]]' variable=2>
<$list filter='[tag<1>tag<2>]'>
</$list>
</$list>
</$list>
<$list fliter='[field:foo[bar]]>
</$list>
Writing this in Julia meant that I was able to start from scratch and make
everything exactly how I wanted it, I am not sure how difficult it would be
to implement this for tiddlywiki. We would have to be very careful because
of how important filters are.
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