[Bug-apl] Fix for echo problem in Emacs on OSX

[Elias Mårtenson]

I finally figured out what was triggering the weird behaviour where everything that was sent to the APL interpreter was echoed to the screen.

The problem happens when readline_lib::add_history is called when Readline is disabled.

The following patch will fix this:

===================================================================

--- Input.cc (revision 56)

+++ Input.cc (working copy)

@@ -255,7 +255,7 @@

       {

         while (*l && *l <= ' ')   ++l;   // skip leading whitespace

 

-        if (*l)   readline_lib::add_history(line);

+        if (use_readline && *l)   readline_lib::add_history(line);

       }

 

    return l;