Added eval of general scheme code and added exit proc.

shell.scm

@@ -4,11 +4,26 @@
 (gnu-history-install-file-manager (string-append (or (getenv "HOME") ".") "/.csi.history"))
 (repl-prompt (lambda () "$ "))
 
+(define config-file (make-parameter (string-append (or (getenv "HOME") ".") "/.hintz-shellrc")))
+(when (file-exists? (config-file))
+  (load (config-file)))
+
+(define exit? (make-parameter #f))
+(define (exit) (exit? #t))
+
 (define (shell-repl)
-  (let ((x (read)))
-    (if (eq? x 'exit)
+    (if (exit?)
         #t
-        (begin (execute (list x))
+        (let ((x (read)))
+          (begin (handle-exceptions
+                  exn
+                  (handle-exceptions
+                   exn
+                   (begin (print-error-message exn)
+                          (display (with-output-to-string (lambda () (print-call-chain)))))
+                   (execute (list x)))
+                  (display (eval x))
+                  (newline))
                  (newline)
                  (shell-repl)))))