How can I stagger text in vim?

Question

Given the following text:

1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5

How can each line be shifted left/right an amount related to their line number? Desired outputs:

1 2 3 4 5
  1 2 3 4 5
    1 2 3 4 5
      1 2 3 4 5
        1 2 3 4 5

and

        1 2 3 4 5
      1 2 3 4 5
    1 2 3 4 5
  1 2 3 4 5
1 2 3 4 5

I've tried setting up a macro with visual block mode with varying degrees of success, but I'd ideally like a one liner that lets me select a block and execute it.

Answer 1

vimscript option

For the result:

1 2 3 4 5
  1 2 3 4 5
    1 2 3 4 5
      1 2 3 4 5
        1 2 3 4 5

Next "commands" solves it:

:for i in range(6)|call setline(i, repeat(' ', (i-1)*2).getline(i))|endfor

For the result:

        1 2 3 4 5
      1 2 3 4 5
    1 2 3 4 5
  1 2 3 4 5
1 2 3 4 5

Not really sure about the "rule" :)

Another option with "macro"

1. step one, create macro

   qq:exe "normal ".((line('.')-1)*2)."I "

2. step two apply to 2nd to the last row (visually select it first)

   '<,'>norm @q

PS, as asked in comment

to make it work for other line range apart started from line 1:

:for i in range(5,9)|call setline(i, repeat(' ', (i-1)*2).getline(i))|endfor