Typoscript menu jump to subpage - typo3

Question

I want to create a menu with submenu, that's quiet straight forward via typoscript. The challenge is, that I want the parent levels to link directly to the first subpage if the content of the containing page is empty.
I know you can achieve that via shortcut links in the backend, but I want to, if possible, achieve that via typoscript.
Any ideas? I enclode the typoscript menu code I currently use.
lib.mainMenu = COA
lib.mainMenu{
10 = HMENU
10{
# Level 1, further levels are generic
1 = TMENU
1.noBlur = 1
1.expAll = 0
1.wrap = <ul data-role="listview" data-inset="true">|</ul>
1.NO = 1
1.NO.ATagBeforeWrap = 1
1.NO.insertData = 1
1.NO.wrapItemAndSub.insertData = 1
1.NO.wrapItemAndSub = <li id="menu_{field:uid}">|</li>
1.NO.ATagTitle.field = subtitle // title
1.ACT = 1
1.ACT.ATagBeforeWrap = 1
1.ACT.wrapItemAndSub.insertData = 1
1.ACT.wrapItemAndSub = <li id="menu_{field:uid}" class="active">|</li>
1.ACT.ATagTitle.field = subtitle // title
1.CUR = 1
1.CUR.ATagBeforeWrap = 1
1.CUR.wrapItemAndSub.insertData = 1
1.CUR.wrapItemAndSub = <li id="menu_{field:uid}" class="active">|</li>
1.CUR.ATagTitle.field = subtitle // title
}
20 < .10
20.entryLevel = 1
20.1.wrap = <ul data-role="listview" data-inset="true">|</ul>
30 < .20
30.entryLevel = 2
40 < .20
40.entryLevel = 3
}

Answer 1

Maybe you can build your solution based on hints from here:
http://typo3-blog.net/tutorials/news/if-funktionen-in-typo3.html
In the example from the link above, it's not a menu, but there's a subquery on a table (in your case tt_content) which will then be used to define if something's output or not:
temp.main = COA
temp.main.20 = COA
temp.main.20 {
[...]
wrap=<div class="meine-adressen">|</div>
stdWrap.if.isTrue.cObject = CONTENT
stdWrap.if.isTrue.cObject{
table = tt_address
select {
[...]
}
renderObj = TEXT
renderObj.value = 1
}
}
temp.main.21 = TEXT
temp.main.21 {
wrap=<div class="keine-adressen">|</div>
value = Keine Adressen gefunden
stdWrap.if.isFalse.cObject < temp.main.20.stdWrap.if.isTrue.cObject
}
But I'm not sure if this wouldn't give you headaches in a HMENU

Answer 2

I think it is possible using typoscript, but I dont know how to do it.
The below typoscript may help you:
Typoscript to find the number of content elements in a page:
lib.emptypage = CONTENT
lib.emptypage{
table = tt_content
select{
selectFields = count(uid) AS count
pid = id
}
renderObj = COA
renderObj {
10 = TEXT
10 {
value = {field:count}
insertData = 1
}
}
wrap = |
}
If count is equal to zero, then the page is empty.
Typoscript to get the first subpage:
lib.firstsubpage= HMENU
lib.firstsubpage {
maxItems = 1
1 = TMENU
1 {
NO = 1
}
}
Please share your typoscript solution after implementing it.