Add some sort of indicator if a file has both tabs AND spaces as indentation

[scottchiefbaker]

If a file has both spaces AND tabs as indentation it would be very handy if vim-slueth would pop up some sort of warning that indentation is inconsistent, so that I know I need to fix it.

[krader1961]

I don't speak for Tim but personally I think this isn't appropriate for vim-sleuth. To let me know of possible whitespace problems I have the following in ~/.vim/plugin/bad-whitespace.vim. Obviously if you have some file types where mixed tabs/spaces are valid you'll want to tweak this to only apply to the appropriate file types.

" Make trailing whitespace on a line highly visible and make it easy to
" remove it. Also flag leading mixed spaces/tabs.
if exists('g:loaded_bad_whitespace')
  finish
endif
let g:did_load_trailing_whitespace = 1

" Highlight trailing whitespace and leading mixed tabs/spaces.
highlight ExtraWhitespace ctermbg=darkred guibg=red
autocmd ColorScheme * highlight ExtraWhitespace ctermbg=red guibg=red
autocmd BufWinEnter * match ExtraWhitespace /\v^\s*( \t|\t )\s*|\s+$/

" The above flashes annoyingly while typing, be calmer in insert mode
autocmd InsertLeave * match ExtraWhitespace /\v^\s*( \t|\t )\s*|\s+$/
autocmd InsertEnter * match ExtraWhitespace /\s\+\%#\@<!$/

function! s:FixWhitespace(line1,line2)
    let l:save_cursor = getpos(".")
    silent! execute ':' . a:line1 . ',' . a:line2 . 's/\s\+$//'
    call setpos('.', l:save_cursor)
endfunction

" Run :TrimSpaces or :FixWhitespace to remove trailing white space.
command! -range=% TrimSpaces    call <SID>FixWhitespace(<line1>,<line2>)
command! -range=% FixWhitespace call <SID>FixWhitespace(<line1>,<line2>)

[tpope]

Personally I wouldn't find this particularly helpful. For every one time I make this mistake myself, I have a hundred where I'm dealing with someone else's jank file, and I really don't want Sleuth twisting the knife with a nagging message. But the reason I'm going to say no is there just isn't a good way to deliver that message. Anything that interrupts the user with a "press ENTER" prompt sounds positively insufferable.