[OpenBIOS] [PATCHv2 4/6] ciface.fs: implement optional (exit) hook when returning control back to the interpreter

[Mark Cave-Ayland]

This allows us to optionally intercept and execute code before returning back
to the Forth interactive console.

Signed-off-by: Mark Cave-Ayland 
---
 openbios-devel/forth/system/ciface.fs |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/openbios-devel/forth/system/ciface.fs b/openbios-devel/forth/system/ciface.fs
index fd6c54e..85a6076 100644
--- a/openbios-devel/forth/system/ciface.fs
+++ b/openbios-devel/forth/system/ciface.fs
@@ -326,6 +326,14 @@ external

: exit ( -- )
   ." EXIT"
+  
+  \ Execute (exit) hook if one exists
+  s" (exit)" $find if
+    execute
+  else
+    2drop
+  then
+  
   outer-interpreter
 ;