Add strip whitespace and check on write

Change-Id: I73ac4260a379c208b1574a934fdbdfb191e5f152

.vimrc

@@ -16,6 +16,7 @@ if filereadable(expand(vundle_dir) . "/README.md")
     Plugin 'tpope/vim-fugitive'
     Plugin 'tpope/vim-surround'
     Plugin 'ctrlpvim/ctrlp.vim'
+    Plugin 'rhysd/vim-clang-format'
     " Plugin 'shougo/neocomplete'
     Plugin 'godlygeek/tabular'
 
@@ -26,6 +27,8 @@ else
     command CloneVundle execute "!git clone " . vundle_repo . " " . vundle_dir
 endif
 
+highlight Search ctermbg=5
+
 filetype plugin indent on    " required
 syntax on
 
@@ -36,11 +39,30 @@ set expandtab " On pressing tab, insert 4 spaces
 set mouse=a
 set hlsearch
 
+" Warn for trailing whitespace. Search with wrap (w) do not move cursor (n)
+function! WhitespaceWarn()
+    echohl WarningMsg
+    echo 'Found whitespace.'
+    echohl None
+    echon ' Type :TrailWhitespace to remove it'
+endfunction
+function! StripTrailingWhitespace()
+    " Save cursor position
+    let l:save = winsaveview()
+    " Remove trailing whitespace
+    %s/\s\+$//e
+    " Move cursor to original position
+    call winrestview(l:save)
+    echo "Stripped trailing whitespace"
+endfunction
+autocmd BufWritePost * if search('\s\+$', 'wn') | call WhitespaceWarn() | endif
+command TrailWhitespace call StripTrailingWhitespace()
+
 " Hybrid line numbers on active buffer
 set nu rnu
 augroup numbertoggle
   autocmd!
-  autocmd BufEnter,FocusGained,InsertLeave * set rnu 
+  autocmd BufEnter,FocusGained,InsertLeave * set rnu
   autocmd BufLeave,FocusLost,InsertEnter   * set nornu
 augroup END
 
@@ -73,12 +95,12 @@ if has("cscope")
     "add any database in current dir
     if filereadable("cscope.out")
         cs add cscope.out
-    "else search cscope.out in git folder 
+    "else search cscope.out in git folder
     else
        let cscope_file=findfile("cscope.out", git_dir_location)
         if !empty(cscope_file) && filereadable(cscope_file)
             exe "cs add" cscope_file git_root_location
-        endif      
+        endif
      endif
 endif