Complete on buffer instead of reading file

ftplugin/todo.vim

@@ -248,8 +248,8 @@ fun! TodoComplete(findstart, base)
         endwhile
         return start
     else
-        let res = []
-        let file = readfile(expand("%:p"))
+        let res = []
+        let lines=getline(1,"$")
         for line in lines
             if line =~ " ".a:base
                 let item={}
@@ -257,7 +257,7 @@ fun! TodoComplete(findstart, base)
                 if a:base =~ '+'
                     let item.info="Context: ".substitute(line,'.*\s\(@\S\S*\).*','\1',"")
                 elseif a:base =~ '@'
-                    let l:pr=[]
+                    let l:pr=[]
                     for line2 in lines
                         if line2 =~ l:item.word
                             call add(l:pr,substitute(line2,'.*\s\(+\S\S*\).*','\1',""))