In giter8, it is possible to change the content of files based on user input, ie (from the docs):
$if(scala212.truthy)$
scalaVersion := "2.12.3"
$elseif(scala211.truthy)$
scalaVersion := "2.11.11"
$else$
scalaVersion := "2.10.6"
$endif$
Is it possible to create some files on certain conditions as well?
No, it's not possible at the moment (v0.10.0), but there is an open issue for that: foundweekends/giter8#345. You can add your opinion and usecase there. You're also welcome to contribute an implementation for this feature.