convert-patterns.vim

" Pattern 1:
"
" * Operate over a whole file: :call ConvertFile()
" * Or operate over a selection: :'<,'>call ConvertLine()
" * Supports the same :s// and normal commands you regularly use in Vim
" * So minimal Vim Script knowledge needed

function! ConvertFile()
  %global/^/call ConvertLine()
endfunction

function! ConvertLine()
  let line = getline(".")

  if line =~ "SOME_PATTERN"
    substitute/SOME_PATTERN/SOME_REPLACEMENT/
    substitute/ANOTHER_PATTERN//

    " You can even search ahead
    normal k$
    /SEARCH_PATTERN
    " Then run a command
    substitute/SOME_PATTERN/SOME_REPLACEMENT/
  elseif line =~ "SOME_OTHER_PATTERN"
    " Change {} braces to []'s
    normal $ma%r]`ar[
  endif
endfunction

" Pattern 2:
"
" * Operate over a selected range: :'<,'>call ConvertRange()
" * Supports deleting lines that match a regex

function! ConvertRange() range
  let i = a:firstline
  while i <= a:lastline && i <= line('$')
    let line = getline(i)

    if line =~ "SOME_PATTERN_TO_DELETE"
      execute i "delete _"
      continue
    endif

    if line =~ "SOME_PATTERN_TO_MODIFY"
      let line = substitute(line, "SOME_PATTERN", "SOME_REPLACEMENT", "")
      let line = substitute(line, "ANOTHER_PATTERN", "", "")
      call setline(i, line)
    endif

    let i += 1
  endwhile
endfunction