fix completion items

Author: mattn

plugin/gist.vim

@@ -12,10 +12,10 @@ endif
 let g:loaded_gist_vim = 1
 
 function! s:CompleteArgs(arg_lead,cmdline,cursor_pos)
-    return ["-p", "-P", "-a", "-m", "-e", "-s", "-d", "+1", "-1", "-f", "-c", "-l", "-la", "-ls", "-b",
+    return filter(copy(["-p", "-P", "-a", "-m", "-e", "-s", "-d", "+1", "-1", "-f", "-c", "-l", "-la", "-ls", "-b",
                 \ "--listall", "--liststar", "--list", "--multibuffer", "--private", "--public", "--anonymous", "--description", "--clipboard",
                 \ "--rawurl", "--delete", "--edit", "--star", "--unstar", "--fork", "--browser"
-                \ ]
+                \ ]), 'stridx(v:val, a:arg_lead)==0')
 endfunction
 
 command! -nargs=? -range=% -bang -complete=customlist,s:CompleteArgs Gist :call gist#Gist(<count>, "<bang>", <line1>, <line2>, <f-args>)