Hi, I'm trying to do something that is a bit beyond me. I'm trying to 
create my first global macro. At least, I think this should be a macro.

*Goal*

I want to generate a table of values from a defined set of fields from a 
set of macros based on a filter (usually defined by a tag).

I've created an example that almost works at 
http://thelostadmin.tiddlyspot.com/#grid

I would like to turn that into a global macro that takes 2 parameters:

   1. A filter that defines the set of tiddlers to get data from. This 
   should default to all tiddlers that are tagged with the title of the 
   tiddler that calls the macro.
   2. A list of field names from those tiddlers to provide the data. This 
   should default to the contents of the list field of the tiddler that calls 
   the macro.

I *think* the "tiddler that calls the macro" should be in 
<<currentTiddler>>, is that right?

*What I am having problems with*

I can't figure out how to properly set the defaults in the macro to do what 
I want. Specifically, in the code below, the default for the filter 
parameter of the macro call should not explicitly define "grid" as the tag, 
but should take it from the title of the current tiddler.

\define grid(filter:"[tag[grid]]", list:"[list[]]")
<table>
<caption>data from $filter$</caption>
<tr><$list filter=$list$ 
variable="columntitle"><th><<columntitle>></th></$list><th>//Link//</th></tr>
<$list filter=$filter$ variable="rowtiddler"><tr>
   <td><$link to=<<rowtiddler>> ><<rowtiddler>></$link></td>
   <$list filter=$list$ variable="cellfield"><td> <$transclude 
tiddler=<<rowtiddler>> field=<<cellfield>>/> </td></$list>
</tr>
</$list>
</table>
\end


*Future plans*

I'm planning to replace the caption with a third option to set the caption 
and probably make the default no caption at all.

*Why I want this*

I have found that I'm using Tiddlywiki for a lot of things that involve 
organizing data and being able to put a bunch of that data into tables is a 
handy way to view it all.


   - Keep track of what I've got the PVR doing (it will record up to 2 
   shows at a time but doesn't have any way of telling me what is conflicting 
   when there are conflicts. Thus a table of what is scheduled when sorted by 
   time and day help find those.
   - I like trolling the clearance bins for DVDs and bluerays. A few times 
   I've re-bought something I already have. Now I can check my wiki from my 
   phone before buying.
   - I have a crazy number of projects to keep track of at work, this helps 
   me categorize them. Plus, the time tracking system isn't the most reliable 
   at times, tiddlywiki gives me a place to record things until the system 
   comes back online.
   - This started with Stephan Hradek's TW5 Magic example of a contacts 
   database and I'm trying to add some features I would like.
   - I'm trying to get to the point that I can create an add-in for 
   tiddlywiki that generates a table instead of me constantly copy/pasting my 
   table generating code every time I want to create a table.

*Things I don't understand*

Why I have to put html into the macro instead of using the wiki markup.

Why I can sometimes use shorthands like {{ ... }} and <<...>> but other 
times I have to use <$.../> and, more importantly how to identify when so I 
don't keep re-writing things because they don't work.

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