Rename txt file from its content

[Suppo]

hello

im having a problem here (lack of knowledge)
i have txt files that are named badly and id like to rename them with their own content
more specifically : every txt file line 2 is what i want to use as title
is this possible to achieve with some expressions?

[truth]

BRU wont read the content of files to be renamed.
With sed, you could use something like:

For %a in (*.txt) do @sed -n "2s/.*/ren %a &.txt/p;3q" %a|sed e
The .* matches all of Line2 as NewName with no error-checking!
Renames against pre-existing same-named files, or with illegal chars, etc, would fail.

You could certainly code all this in, but most prefer using graphical apps.
Den4b-Renamer seems to be popular for such things, but I've yet to try it.
I do know it has the ability to file-read for rename-criteria, but beyond that, I've no idea.