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replaces banger with bounce operator

--- a/sim.c

+++ b/sim.c

@@ -221,7 +221,7 @@

 #define ALPHA_OPERATORS(_)                                                     \

   _('A', add)                                                                  \

-  _('B', banger)                                                               \

+  _('B', bounce)                                                               \

   _('C', clock)                                                                \

   _('D', delay)                                                                \

   _('E', movement)                                                             \

@@ -425,22 +425,25 @@

   POKE(1, 0, indexed_glyphs[(a + b) % Glyphs_index_count]);

 END_OPERATOR

-BEGIN_OPERATOR(banger)

+BEGIN_OPERATOR(bounce)

   LOWERCASE_REQUIRES_BANG;

-  PORT(0, 1, IN | NONLOCKING);

+  PORT(0, -1, IN | PARAM);

+  PORT(0, 1, IN);

   PORT(1, 0, OUT);

-  Glyph g = PEEK(0, 1);

-  Glyph result;

-  switch (g) {

-  case '1':

-  case '*':

-  case MOVEMENT_CASES:

-    result = '*';

-    break;

-  default:

-    result = '.';

+  Usz rate = index_of(PEEK(0, -1));

+  Usz to = index_of(PEEK(0, 1));

+  if (rate == 0)

+    rate = 1;

+  if (to < 2) {

+    POKE(1, 0, glyph_of(0));

+    return;

   }

-  POKE(1, 0, result);

+  to = to - 1;

+  Usz key = (Tick_number / rate) % (to * 2);

+  if (key > to)

+    key = to - (key - to);

+  Glyph g = glyph_of(key);

+  POKE(1, 0, g);

 END_OPERATOR

 BEGIN_OPERATOR(clock)