align.vim

command! -nargs=? -range Align <line1>,<line2>call AlignSection('<args>')
vnoremap <silent> <Leader>a :Align<CR>
function! AlignSection(regex) range
  let extra = 1
  let sep = empty(a:regex) ? '=' : a:regex
  let maxpos = 0
  let section = getline(a:firstline, a:lastline)
  for line in section
    let pos = match(line, ' *'.sep)
    if maxpos < pos
      let maxpos = pos
    endif
  endfor
  call map(section, 'AlignLine(v:val, sep, maxpos, extra)')
  call setline(a:firstline, section)
endfunction

function! AlignLine(line, sep, maxpos, extra)
  let m = matchlist(a:line, '\(.\{-}\) \{-}\('.a:sep.'.*\)')
  if empty(m)
    return a:line
  endif
  let spaces = repeat(' ', a:maxpos - strlen(m[1]) + a:extra)
  return m[1] . spaces . m[2]
endfunction