vim: function whitespaces

.vimrc

@@ -234,15 +234,24 @@ nnoremap <Leader>z :set nonumber! norelativenumber!<CR>
 :  autocmd BufLeave,FocusLost,InsertEnter,WinLeave   * if &nu                  | set nornu | endif
 :augroup END
 
-" entferne trailing whitespaces beim speichern
-autocmd BufWritePre * :%s/\s\+$//e
-" entferne multiple consecutive empty lines
-if executable('cat')
-  autocmd BufWritePre *.md silent %!cat -s
-endif
-" remove multiple whitespaces between words
-" https://stackoverflow.com/questions/5150870/efficient-way-to-remove-multiple-spaces-between-two-words-in-Vim
-autocmd BufWritePre *.md :%s/\(\w\)\s\+\(\w\)/\1 \2/g
+function! Whitespaces()
+    " Remove trailing whitespace
+    %s/\s\+$//e
+
+    " Replace consecutive spaces between words with a single space (only for .md files)
+    if &filetype == "markdown"
+        %s/\(\w\)\s\+\(\w\)/\1 \2/g
+    endif
+
+    " Run silent command to remove multiple consecutive empty lines (only for .md files)
+    if &filetype == "markdown"
+        silent %!cat -s
+    endif
+endfunction
+
+" Map F9 to execute the custom function
+nnoremap <F9> :call Whitespaces()<CR>
+
 
 
 " Exit Vim if NERDTree is the only window remaining in the only tab.