modifying vim paragraph jumping commands to whitespace-containing lines or code blocks

Question

1) With the { and } commands in vim I can jump to the previous or next completely blank line (or beginning or end of file). How do I modify these commands to jump to the previous or next line being completely blank or containing only whitespace (or beginning or end of file) ?

2) How do I create commands to jump to the beginning or end of the current code block, defined by the current indent? For example, I want to easily move from line F to line D or G (or to line C or H):

A
  B
  C
    D
    E
    F
    G
  H
I

Answer 1

Question 1 seems relatively easy (and my answer probably a bit naive):

nnoremap } /^\s*$<CR>
nnoremap { ?^\s*$<CR>

But you should find another shortcut, I think.

Also you already have gg to jump to the first line of the buffer and G to jump to its last line. Isn't that enough?

I don't know how to answer question 2 in a simple manner. Did you try vim-indent-object?

Answer 2

Combining the great tips of romainl and garyjohn I got the exact functionality I was looking for for part #1:

nnoremap <silent> { :call MyPrevParagraph()<CR>
nnoremap <silent> } :call MyNextParagraph()<CR>

function MyNextParagraph()
  let myline = search('^\s*$', 'W')
  if myline <= 0
    execute 'normal! G$'
  else
    execute 'normal! '.myline.'G0'
  endif
endfunction

function MyPrevParagraph()
  let myline = search('^\s*$', 'bW')
  if myline <= 0
    execute 'normal! gg0'
  else
    execute 'normal! '.myline.'G0'
  endif
endfunction