2

I want all redundant whitespaces to be removed on write/save. How can I do that? By redundant I mean ones that exists after the last character or if there's an empty line and it contains a few whitespaces.

5

Probably something like that should work:

autocmd BufWritePre * :%s/\s\+$//

The autocommand triggers :%s/\s\+$// each time a buffer will be written. And the substitution command removes all of the whitespaces at the end of lines.

3

I have a function for this, which also saves the cursor position:

function! <SID>StripTrailingWhitespaces()
  " save last search & cursor position
  let _s=@/
  let l = line(".")
  let c = col(".")
  %s/\s\+$//e
  let @/=_s
  call cursor(l, c)
endfunction

This function can be called on the writepre hook:

autocmd BufWritePre *.rb,*.php,*.py,*.js,*.txt,*.hs,*.java,*.md call <SID>StripTrailingWhitespaces()

Or if you want it on every file:

autocmd BufWritePre * call <SID>StripTrailingWhitespaces()

Note: I have not written this function, but copied it from somewhere. Unfortunaly i don't remember where i found it. As pointed out in the comments, the source is probably vimcast (link). So even if it doesn't matter for you, i don't want to take credit for this function, and vimcast can't be mentioned enough, as it is a great source for vim related knowledge.

  • Your source is (probably) vimcast – statox Feb 15 '17 at 8:12
  • 1
    @statox i think the source of my source was vimecast ^^. But thanks a lot for the link, i added it to my answer. – Doktor OSwaldo Feb 15 '17 at 8:17
  • 1
    See @Carpetsmoker's answer to a related question for a much simpler version of the function. – Rich Feb 15 '17 at 9:47
  • @Rich interesting, thank you a lot. It even saves fold and some more stuff, guess i have to adept my preserve function =) – Doktor OSwaldo Feb 15 '17 at 10:06

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