Vim scripting: Preserve cursor position and screen view in function call
let l:winview = winsaveview()
" do stuff
call winrestview(l:winview)
This should pretty much do exactly what you want it to do, possibly excepting the line count changing above the cursor (I suspect that deleted lines above the cursor would have the effect of moving the cursor down).
You can save a mark for the first on-screen line that is displayed in the window and restore that as well. An example that executes a g?
command on the whole buffer and restores both positions:
:noremap <F11> mkHmlggg?G`lzt`k
Walking through the command:
mk
: set markk
for the current positionH
: go to the first on-screen lineml
: set markl
for the this positionggg?G
: execute the command- ``l
: jump to mark
l` zt
: set this line the first on-screen line- ``k
: jump to mark
k`