Save view after execute command?

Question

I'm mostly developing with python. I'm using pdbpp as python debugger so I'm contantly adding

import pdb;pdb.set_trace()

or

import pdb
pdb.set_trace()

So I wrote couple of functions.

function! AddBreakPoint()
    let l:line = line('.')
    let l:indentChar = ' '
    call append(l:line - 1, repeat(l:indentChar, indent(l:line)) . "import pdb;pdb.set_trace")
endfunction


function! RemoveAllBreakPoints()
    write
    silent! execute 'bufdo g/\v^\s+(import pdb|pdb.set_trace)/de'
endfunction

The problem with that now is that RemoveAllBreakPoints() messes relative position of cursor on the screen. So for example if the cursor was in the middle of the screen after zz it would be on the same line, but this line suddenly appears at the bottom of the screen.

EDIT1 OK, I solved it with KeepView plugin, but could someone explain to me why vim doing that and is there a native way to keep view after executing command?

Answer 1

You don't need a plugin for that, the functionality is built into Vim:

function! RemoveAllBreakPoints()
    let view = winsaveview()
    write
    g/\v^\s+(import pdb|pdb.set_trace)/d
    call winrestview(view)
endfunction

Reference:

:help winsaveview()
:help winrestview()