The following snippet builds an index of tiddlers with one button, then
exports the index with another button. But while I tried to limit the
tiddlers in the index to include only those with the word `Topics` in the
`meta` field, it is adding all the tiddlers to the index. Any advice?
\define indexvalue() $(title)$|$(caption)$|$(tags)$
<$wikify name=indextitle text={{{ [{$:/SiteTitle}addprefix[index-for-]] }}}
>
<$button>Make Index
<$list filter="[!is[system]meta[Topics]]">
<$vars title={{!!title}} caption={{!!caption}} tags={{!!tags}} >
<$action-setfield $tiddler=<<indextitle>> $index=<<currentTiddler>>
$value=<<indexvalue>>/>
</$vars>
</$list>
<$wikify name=tiddlywiki text={{{
[{$:/SiteTitle}addsuffix[.html]][{$:/config/SaveWikiButton/Filename}]+[!is[blank]last[]]
}}} >
<$action-setfield $tiddler=<<indextitle>> $field="tiddlywiki"
$value=<<tiddlywiki>>/>
<$action-setfield $tiddler=<<indextitle>> $field="index-source"
$value="./XXXXX.sources.html"/>
</$wikify>
</$button>
<$vars tv-config-toolbar-class="tc-button tt-button">
<$list
filter="[<indextitle>!is[missing]]">{{||$:/core/ui/Buttons/export-tiddler}}</$list>
</$vars>
</$wikify>
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