Toc uses currentTiddler as "tag" default parameter if it is missing (#8291)

* toc's use currentTiddler, if tag prameter is undefined

* add currentTiddler info to toc documentation

core/wiki/macros/toc.tid

@@ -37,7 +37,10 @@ tags: $:/tags/Macro
 \end
 
 \define toc(tag,sort:"",itemClassFilter:"", exclude)
+\whitespace trim
+<$let __tag__={{{ [<__tag__>is[blank]then<currentTiddler>else<__tag__>] }}} >
   <$macrocall $name="toc-body"  tag=<<__tag__>> sort=<<__sort__>> itemClassFilter=<<__itemClassFilter__>> exclude=<<__exclude__>>/>
+</$let>
 \end
 
 \define toc-linked-expandable-body(tag,sort:"",itemClassFilter,exclude,path)
@@ -99,7 +102,7 @@ tags: $:/tags/Macro
 
 \define toc-expandable(tag,sort:"",itemClassFilter:"",exclude,path)
 \whitespace trim
-<$let tag=<<__tag__>> sort=<<__sort__>> itemClassFilter=<<__itemClassFilter__>> path={{{ [<__path__>addsuffix[/]addsuffix<__tag__>] }}}>
+<$let __tag__={{{ [<__tag__>is[blank]then<currentTiddler>else<__tag__>] }}} tag=<<__tag__>> sort=<<__sort__>> itemClassFilter=<<__itemClassFilter__>> path={{{ [<__path__>addsuffix[/]addsuffix<__tag__>] }}}>
   <$set name="excluded" filter="[subfilter<__exclude__>] [<__tag__>]">
     <ol class="tc-toc toc-expandable">
       <$list filter="""[all[shadows+tiddlers]tag<__tag__>!has[draft.of]$sort$] -[<__tag__>] -[subfilter<__exclude__>]""">
@@ -173,7 +176,7 @@ tags: $:/tags/Macro
 
 \define toc-selective-expandable(tag,sort:"",itemClassFilter,exclude,path)
 \whitespace trim
-<$let tag=<<__tag__>> sort=<<__sort__>> itemClassFilter=<<__itemClassFilter__>> path={{{ [<__path__>addsuffix[/]addsuffix<__tag__>] }}}>
+<$let __tag__={{{ [<__tag__>is[blank]then<currentTiddler>else<__tag__>] }}} tag=<<__tag__>> sort=<<__sort__>> itemClassFilter=<<__itemClassFilter__>> path={{{ [<__path__>addsuffix[/]addsuffix<__tag__>] }}}>
   <$set name="excluded" filter="[subfilter<__exclude__>] [<__tag__>]">
     <ol class="tc-toc toc-selective-expandable">
       <$list filter="""[all[shadows+tiddlers]tag<__tag__>!has[draft.of]$sort$] -[<__tag__>] -[subfilter<__exclude__>]""">
@@ -188,6 +191,7 @@ tags: $:/tags/Macro
 
 \define toc-tabbed-external-nav(tag,sort:"",selectedTiddler:"$:/temp/toc/selectedTiddler",unselectedText,missingText,template:"",exclude)
 \whitespace trim
+<$let __tag__={{{ [<__tag__>is[blank]then<currentTiddler>else<__tag__>] }}}>
   <$tiddler tiddler={{{ [<__selectedTiddler__>get[text]] }}}>
     <div class="tc-tabbed-table-of-contents">
       <$linkcatcher to=<<__selectedTiddler__>>>
@@ -208,11 +212,14 @@ tags: $:/tags/Macro
       </div>
     </div>
   </$tiddler>
+</$let>
 \end
 
 \define toc-tabbed-internal-nav(tag,sort:"",selectedTiddler:"$:/temp/toc/selectedTiddler",unselectedText,missingText,template:"",exclude)
 \whitespace trim
+<$let __tag__={{{ [<__tag__>is[blank]then<currentTiddler>else<__tag__>] }}}>
   <$linkcatcher to=<<__selectedTiddler__>>>
     <$macrocall $name="toc-tabbed-external-nav" tag=<<__tag__>> sort=<<__sort__>> selectedTiddler=<<__selectedTiddler__>> unselectedText=<<__unselectedText__>> missingText=<<__missingText__>> template=<<__template__>> exclude=<<__exclude__>> />
   </$linkcatcher>
+</$let>
 \end

editions/tw5.com/tiddlers/macros/TableOfContentsMacro.tid

@@ -1,5 +1,5 @@
 created: 20140919155729620
-modified: 20230427125500432
+modified: 20240624102502089
 tags: Macros [[Core Macros]]
 title: Table-of-Contents Macros
 type: text/vnd.tiddlywiki
@@ -8,10 +8,13 @@ type: text/vnd.tiddlywiki
 
 ; <<.var toc>>
 : A simple tree
+
 ; <<.var toc-expandable>>
 : A tree in which all the branches can be expanded and collapsed
+
 ; <<.var toc-selective-expandable>>
 : A tree in which the non-empty branches can be expanded and collapsed
+
 ; <<.var toc-tabbed-internal-nav>> and <<.var toc-tabbed-external-nav>>
 : A two-panel browser:
 :* on the left, a selectively expandable tree that behaves like a set of vertical tabs
@@ -21,6 +24,7 @@ The difference between the last two has to do with what happens when the user cl
 
 ; <<.var toc-tabbed-internal-nav>>
 : The target tiddler appears in the right-hand panel, replacing the tiddler that contained the link
+
 ; <<.var toc-tabbed-external-nav>>
 : The target tiddler appears in the normal way (which depends on the user's configured storyview)
 
@@ -44,6 +48,8 @@ To make a table of contents appear in the sidebar, see [[How to add a new tab to
 
 ; tag
 : The root tag that identifies the top level of the tree
+: <<.from-version "5.3.5">> If the <<.param tag>> parameter is "missing" or "an empty" string, the <<.var curretTiddler>> variable is used
+
 ; sort
 : An optional extra [[filter step|Filter Step]], e.g. `sort[title]`