+" From Tip 212:
+" http://vim.wikia.com/wiki/Setting_file_attributes_without_reloading_a_buffer
+
+function! SetExecutableBit(x)
+ if !executable('chmod')
+ return
+ endif
+ checktime
+ let fname = expand("%:p")
+ let fx = executable(fname)
+ execute "au FileChangedShell " . fname . " :echo"
+ if a:x && !fx
+ !chmod a+x %
+ elseif !a:x && fx
+ !chmod a-x %
+ endif
+ if v:shell_error
+ echoerr 'Error running chmod: ' . v:shell_error
+ endif
+ checktime
+ execute "au! FileChangedShell " . fname
+endfunction
+command! Xbit if executable(expand("%:p")) | call SetExecutableBit(0) | else | call SetExecutableBit(1) | endif
+
+