vim: trim trailing spaces

packages/vim/init.vim

@@ -45,6 +45,17 @@ let g:netrw_winsize = 25
 call matchadd('colorcolumn', '\%101v', 100)
 highlight colorcolumn ctermbg=red
 
+fun! TrimWhitespace()
+  " Skip if the filetype is markdown
+  if &ft =~ 'markdown'
+    return
+  endif
+  let l:save = winsaveview()
+  keeppatterns %s/\s\+$//e
+  call winrestview(l:save)
+endfun
+autocmd BufWritePre * call TrimWhitespace()
+
 " undofile - This allows you to use undos after exiting and restarting
 " This, like swap and backups, uses .vim-undo first, then ~/.vim/undo
 " :help undo-persistence