Vim RunCommands

.vimrc

source $VIMRUNTIME/defaults.vim

:function PythonEnt(isnf,lang)
:let l:filen = expand("%:p")
:if a:lang == "Py"

:if len(glob("*.py",0,1)) <= 1 && !a:isnf 
			\&& filewritable(filen)
			\&& getfsize(filen) == 0
:call setline(1,"#!/usr/bin/env python")
:elseif empty(glob("*.py",0,1)) && a:isnf
:call setline(1,"#!/usr/bin/env python")
:endif
:endif

:if a:lang == "C"
:if len(glob("*.c",0,1)) <= 1 && !a:isnf 
			\&& filewritable(filen)
			\&& getfsize(filen) == 0
:call append(0,['#include <stdio.h>','#include <stdlib.h>',
			\"",
			\ "int main(int argc,char** argv)",
			\"{","\treturn 0;","}"])
:elseif empty(glob("*.c",0,1)) && a:isnf
:call append(0,['#include <stdio.h>','#include <stdlib.h>',
			\"",
			\ "int main(int argc,char** argv)",
			\"{","\treturn 0;","}"])
:endif
:endif

:endfunction

:autocmd BufNewFile *.py call PythonEnt(1,"Py")
:autocmd BufReadPost *.py call PythonEnt(0,"Py")
:autocmd BufNewFile *.c call PythonEnt(1,"C")
:autocmd BufReadPost *.c call PythonEnt(0,"C")