vim から perl のドキュメントを開く方法

:nnoremap <buffer> <silent> _f :!perldoc -f <cword><Enter>

use open;

       open FILEHANDLE,EXPR
       open FILEHANDLE,MODE,EXPR
       open FILEHANDLE,MODE,EXPR,LIST
       open FILEHANDLE,MODE,REFERENCE
       open FILEHANDLE
               Opens the file whose filename is given by EXPR, and associates
               it with FILEHANDLE.

               (The following is a comprehensive reference to open(): for a
               gentler introduction you may consider perlopentut.)

               If FILEHANDLE is an undefined scalar variable (or array or hash
               element) the variable is assigned a reference to a new anony-
               mous filehandle, otherwise if FILEHANDLE is an expression, its
               value is used as the name of the real filehandle wanted.  (This
               is considered a symbolic reference, so "use strict 'refs'"
               should not be in effect.)

               If EXPR is omitted, the scalar variable of the same name as the
               FILEHANDLE contains the filename.  (Note that lexical vari-
               ables--those declared with "my"--will not work for this pur-
               pose; so if you're using "my", specify EXPR in your call to
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