1 files changed, 9 insertions, 5 deletions
diff --git a/minigrep/src/lib.rs b/minigrep/src/lib.rs
index 9f0adbd..bf7118f 100644
--- a/minigrep/src/lib.rs
+++ b/minigrep/src/lib.rs
@@ -20,13 +20,17 @@ impl Config {
         let filename = args[2].clone();
         let mut case_sensitive = env::var("CASE_INSENSITIVE").is_err();
 
-        if args.nth(3) == "-i" {
-            case_sensitive = false;
-        }
-        else if args[3] == "-s" {
-            case_sensitive = true;
+        // override environment variable if cli arg is present
+        if args.len() > 3 {
+            if args[3] == "-s" {
+                case_sensitive = true;
+            }
+            else if args[3] == "-i" {
+                case_sensitive = false;
+            }
         }
 
+
         Ok(Config { query, filename, case_sensitive })
     }