Add panic recovery to REPL executor for better resilience

Added defer-recover mechanism to the executor function to catch unexpected panics.
When a panic occurs, a user-friendly error message is displayed and the REPL can continue to function.
This improves the robustness of the REPL when handling unexpected errors.

1 files changed, 8 insertions, 0 deletions

diff --git a/internal/repl/repl.go b/internal/repl/repl.go
index d903a90..ec5f245 100644
--- a/internal/repl/repl.go
+++ b/internal/repl/repl.go
@@ -99,6 +99,14 @@ func RunREPL() error {
 
 // executor runs a calculation command and returns the result
 func executor(input string) {
+	// Add panic recovery for better resilience
+	defer func() {
+		if r := recover(); r != nil {
+			fmt.Printf("Error: Unexpected error occurred: %v\n", r)
+			fmt.Println("Please try a different expression or command.")
+		}
+	}()
+
 	input = strings.TrimSpace(input)
 	if input == "" {
 		return