function 
    /usr/local/lib/janet/spork/getline.janet  on  line  61 , column  1 
    
    (make-getline  &opt  autocomplete-context  autocomplete-options  doc-fetch )
    Reads  a  line  of  input  into  a  buffer , like  `getline` .  However , allow  
    looking  up  entries  with  a  general  lookup  function  rather  than  an  
    environment  table.