vimrc: convert to UNIX line endings automatically.

vimrc

@@ -102,3 +102,21 @@ autocmd BufReadPost *
 if has("autocmd") 
     au BufReadPost * if &modifiable | retab | endif 
 endif 
+
+" dos2unix ^M copied from http://stackoverflow.com/a/5361702/1675649
+fun! Dos2unixFunction()
+    let _s=@/
+    let l = line(".")
+    let c = col(".")
+    try
+        set ff=unix
+        w!
+        "%s/\%x0d$//e
+    catch /E32:/
+        echo "Sorry, the file is not saved."
+    endtry
+    let @/=_s
+    call cursor(l, c)
+endfun
+com! Dos2Unix keepjumps call Dos2unixFunction()
+au BufReadPost * keepjumps call Dos2unixFunction()