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I want to remap a key, but I want the mapping to be active only when I'm in the last line of my file. Is there a simple way to do this? I would also like to do a similar thing when I'm in the first line, but that is not essential to me at the moment.
My specific use case is that I want to remap j to <C-E> when I'm in the final line, but I also want to know if this is possible for curiosity's sake.
Expression mappings allow you to map to a dynamic rhs:
Try this:
:nnoremap <expr> j line('.') == line('$') ? '<C-E>' : 'j'
This makes use of a ternary if-then-else expression to map to <C-E> on the last line or j otherwise.
