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" Strip trailing whitespace with \x in the whole document
if has('eval')
" Define function for stripping whitespace
function! s:StripTrailingWhitespace()
" Iterating line number
let l:li = 1
" Line number of last line that had non-whitespace characters on it
let l:lw = 0
" Line number of the file's last line
let l:ll = line('$')
" Iterate over the lines
while l:li <= l:ll
" Get the line text
let l:line = getline(l:li)
" Replace the line with a subsitution of its text stripping extraneous
" whitespace
call setline(l:li, substitute(l:line, '\m\C\s\+$', '', 'g'))
" If this line has any non-whitespace characters on it, update l:lw with
" its index
if l:line =~# '\m\C\S'
let l:lw = l:li
endif
" Increment the line counter for the next iteration
let l:li = l:li + 1
endwhile
" If the last non-whitespace line was before the last line proper, we can
" delete all lines after it
if l:lw < l:ll
" Get the current line and column so we can return to it
" (Yes I know about winsaveview() and winrestview(); I want this to work
" even on very old versions of Vim if possible)
let l:lc = line('.')
let l:cc = col('.')
" Delete the lines, which will move the cursor
execute l:lw + 1.',$ delete'
" Return the cursor to the saved position
call cursor(l:lc, l:cc)
endif
endfunction
" Map \x to the function just defined
nnoremap <silent> <leader>x :<C-U>call <SID>StripTrailingWhitespace()<CR>
endif
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