Cleanup key remapping technique about vim-pencil HOT 1 OPEN

I have a suggestion. Instead of detection, what about using <Plug> bindings? With these, you can make movement commands a user binds their keys to, and pencil manages the meaning of these commands to suit the wrap mode.

On startup you'd make bindings like:

nnoremap <Plug>Pencilkeys_down j
nnoremap <Plug>Pencilkeys_AltDown gj
...

The user would bind to these plug mappings in their rc file.

And when you initialize pencil mode, you'd change what the plug mappings do for the buffer:

nnoremap <buffer> <Plug>Pencilkeys_down gj
nnoremap <buffer> <Plug>Pencilkeys_AltDown j
...

And to shut off pencil mappings you can unbind the buffer local pencil mappings.

This should make unbinding everything clean. It solves the problem of reverting to a user's original bindings because you won't have to anymore.

I was going to suggest this as an enhancement, but this issue covers my problem and why I am doing this on my own, since my 0 and ^ weren't handled right.

from vim-pencil.