## calc.sl

A simple calculator that takes a SLang expression, evaluates it and prints the result in the form of a comment after the expression.

If you use it with two windows, one window (Calculator) is used to edit expressions, in the other one (*calcres*) the results are displayed.

     File   Edit   Mode   Search   Buffers   Windows   System   Help
     R(E1):
             45

     R(E2):
             "0: 0"
             "1: 1"
             "2: 4"

     [EOB]
     -**-----|V0.99.16| *calcres* () | 9/9,1-------------------------
     %-------------- :-)   E1
     a=0; for (i=0; i<10; i++) a+=i;
     a;
             %R:  45

     %-------------- :-)   E2
     for (i=0; i<3; i++) sprintf ("%d: %d", i, i*i);
             %R:  "2: 4"

     %-------------- :-)   E3
     [EOB]
     -**-----|V0.99.16| Calculator (SLangCalc) | 11/11,1-------------

The evaluation is started with `calc_make_calculation()` (^C^A if ^C is your _Reserved_Key_Prefix). Use the calc_mode_hook to define your own bindings e.g. in your .jedrc:

       define calc_mode_hook ()
       {
          local_setkey ("calc_make_calculation", "^[^M");  % Alt-Return
       }

The result of an expression is everything that is left on the SLang stack after the expression is evaluated. The result of evaluation of

       1+1; 2+2;

would be

       2
       4

but only 4 is written into the expression buffer. The other results can be found in the result buffer using `calc_result_window()` (^C^W).

An expression can be any valid SLang code. Multiple expressions can be divided by a tag with `calc_next_expression()` (^C^N).

There are 25 predefined variables ([a-z]) that can be used without declaration and displayed with `calc_display_variables()` (^C^V).

Use `calc_help()` (^C^H) (or look at the mode menu) for help on keys.

### Other operations

Expressions can be saved (^C^S) to a file and loaded (^C^R) later.

The display format for integer and float results can be changed from the mode menu. The combined mode displays integer results in dec, oct, hex and bin format.

### Installation

Put the file somewhere on your jed_library_path and

       autoload ("calc", "calc.sl");
       autoload ("calc2", "calc.sl");

in your .jedrc file.

Then you can invoke the calculator with `M-x calc` or `M-x calc2` for two-window mode.

To get a Calc menu entry insert in your .jedrc:

if you have jed 99.13:

         static define load_popups_hook (menubar)
         {
            %
            menu_insert_item (3, "Global.S&ystem", "Ca&lculate", "calc");
         }
         variable Menu_Load_Popups_Hook = &load_popups_hook;

if you have a newer version than jed 99.13:

         define calc_load_popup_hook (menubar)
         {
            menu_insert_item (7, "Global.S&ystem", "Ca&lculate", "calc");
         }
         append_to_hook ("load_popup_hooks", &calc_load_popup_hook);

or insert the `menu_insert_item()` function to an already defined `_load_popup_hook`.