I should have scrutinised my code before posting here. There was a mistake
in <<toc-linked-selective-single-expandable-body>>; it didn't have the list
for "empty" children. I've also realised that it should be
!tag[Log]!visibility[hidden] instead. I've added that to the macro so now
it looks like this:
\define toc-linked-selective-single-expandable-body(tag,sort:"",
itemClassFilter:" ",exclude,path)
<$set name="toc-state" value=<<qualify """$:/state/toc/$tag$""">>>
<$set name="toc-item-class" filter="""$itemClassFilter$""" emptyValue=
"toc-item" value="toc-item-selected" >
<li class=<<toc-item-class>>>
<$link>
<$list filter=
"[all[current]tagging[]!visibility[hidden]!tag[Log]limit[1]]" variable=
"ignore" emptyMessage="<$button
class='tc-btn-invisible'>{{$:/core/images/blank}}</$button>">
<$reveal type="nomatch" state=<<toc-state>> text=<<currentTiddler
>>>
<$button set=<<toc-state>> setTo=<<currentTiddler>>
class="tc-btn-invisible
tc-popup-keep">
{{$:/core/images/right-arrow}}
</$button>
</$reveal>
<$reveal type="match" state=<<toc-state>> text=<<currentTiddler>>>
<$button set=<<toc-state>> setTo="x-all-close"
class="tc-btn-invisible
tc-popup-keep">
{{$:/core/images/down-arrow}}
</$button>
</$reveal>
</$list>
<<toc-caption>>
</$link>
<$reveal type="match" state=<<toc-state>> text=<<currentTiddler>>>
<$macrocall $name="toc-selective-single-expandable" tag=<<
currentTiddler>> sort="""$sort$""" itemClassFilter="""$itemClassFilter$"""
exclude="""$exclude$""" path="""$path$"""/>
</$reveal>
</li>
</$set>
</$set>
\end
\define toc-unlinked-selective-single-expandable-body(tag,sort:"",
itemClassFilter:" ",exclude,path)
<$set name="toc-state" value=<<qualify """$:/state/toc/$tag$""">>>
<$set name="toc-item-class" filter="""$itemClassFilter$""" emptyValue=
"toc-item" value="toc-item-selected">
<li class=<<toc-item-class>>>
<$list filter=
"[all[current]tagging[]!visibility[hidden]!tag[Log]limit[1]]" variable=
"ignore" emptyMessage="<$button
class='tc-btn-invisible'>{{$:/core/images/blank}}</$button> <$view
field='caption'><$view field='title'/></$view>">
<$reveal type="nomatch" state=<<toc-state>> text=<<currentTiddler>>>
<$button set=<<toc-state>> setTo=<<currentTiddler>>
class="tc-btn-invisible
tc-popup-keep">
{{$:/core/images/right-arrow}}
<<toc-caption>>
</$button>
</$reveal>
<$reveal type="match" state=<<toc-state>> text=<<currentTiddler>>>
<$button set=<<toc-state>> setTo="close" class="tc-btn-invisible
tc-popup-keep">
{{$:/core/images/down-arrow}}
<<toc-caption>>
</$button>
</$reveal>
</$list>
<$reveal type="match" state=<<toc-state>> text=<<currentTiddler>>>
<$macrocall $name="""toc-selective-single-expandable"""
tag=<<currentTiddler>> sort="""$sort$"""
itemClassFilter="""$itemClassFilter$""" exclude="""$exclude$"""
path="""$path$"""/>
</$reveal>
</li>
</$set>
</$set>
\end
\define toc-selective-single-expandable-empty-message()
<<toc-linked-selective-single-expandable-body tag:"""$(tag)$""" sort:
"""$(sort)$""" itemClassFilter:"""$(itemClassFilter)$""" exclude:
"""$(excluded)$""" path:"""$(path)$""">>
\end
\define toc-selective-single-expandable(tag,sort:"",itemClassFilter,exclude,
path)
<$vars tag="""$tag$""" sort="""$sort$""" itemClassFilter=
"""$itemClassFilter$""" excluded="""$exclude$ -[[$tag$]]""" path=
"""$path$/$tag$""">
<ol class="tc-toc toc-selective-expandable">
<$list filter="""[all[shadows+tiddlers]tag[$tag$]!has[draft.of]$sort$]
-[[$tag$]] $exclude$""">
<$list filter="[all[current]toc-link[no]]" variable="ignore"
emptyMessage=<<toc-selective-single-expandable-empty-message>> >
<$macrocall $name=toc-unlinked-selective-expandable-body tag=
"""$tag$""" sort="""$sort$""" itemClassFilter="""$itemClassFilter$"""
exclude=<<excluded>> path=<<path>> >
</$list>
</$list>
</ol>
</$vars>
\end
Hopefully it might help someone out in future.
As for the second question I have, I suppose it's not possible. What I had
in mind when I posted was that the toc would sort alphabetically, but it
would use the caption's value if there were one, else the title. I've
decided to just use the list field for all the parents.
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