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"
" strip_trailing_whitespace.vim: User-defined key mapping and optional command
" to strip trailing whitespace in the whole document.
"
" Author: Tom Ryder <tom@sanctum.geek.nz>
" License: Same as Vim itself
"
if exists('g:loaded_strip_trailing_whitespace') || &compatible
finish
endif
let g:loaded_strip_trailing_whitespace = 1
" 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\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
silent execute l:lw + 1 . ',$ delete'
" Return the cursor to the saved position
call cursor(l:lc, l:cc)
endif
endfunction
" Create mapping proxy to the function just defined
noremap <silent> <unique>
\ <Plug>StripTrailingWhitespace
\ :<C-U>call <SID>StripTrailingWhitespace()<CR>
" Define a user command too, if we can
if has('user_commands')
command -nargs=0
\ StripTrailingWhiteSpace
\ call <SID>StripTrailingWhitespace()
endif
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