Flags and args on def (#8953)

# Description

Fixes #8916 
Fix flags and args on def which were call wrong .
Added some tests too .

crates/nu-engine/src/eval.rs

@@ -112,7 +112,22 @@ pub fn eval_call(
             if let Some(var_id) = named.var_id {
                 let mut found = false;
                 for call_named in call.named_iter() {
-                    if call_named.0.item == named.long {
+                    if let (Some(spanned), Some(short)) = (&call_named.1, named.short) {
+                        if spanned.item == short.to_string() {
+                            if let Some(arg) = &call_named.2 {
+                                let result = eval_expression(engine_state, caller_stack, arg)?;
+
+                                callee_stack.add_var(var_id, result);
+                            } else if let Some(arg) = &named.default_value {
+                                let result = eval_expression(engine_state, caller_stack, arg)?;
+
+                                callee_stack.add_var(var_id, result);
+                            } else {
+                                callee_stack.add_var(var_id, Value::boolean(true, call.head))
+                            }
+                            found = true;
+                        }
+                    } else if call_named.0.item == named.long {
                         if let Some(arg) = &call_named.2 {
                             let result = eval_expression(engine_state, caller_stack, arg)?;
 

src/tests/test_engine.rs

@@ -379,3 +379,27 @@ fn assignment_to_in_var_no_panic() -> TestResult {
 fn assignment_to_env_no_panic() -> TestResult {
     fail_test(r#"$env = 3"#, "cannot_replace_env")
 }
+
+#[test]
+fn short_flags() -> TestResult {
+    run_test(
+        r#"def foobar [-a: int, -b: string, -c: string] { echo $'($a) ($c) ($b)' }; foobar -b "balh balh" -a 1543  -c "FALSE123""#,
+        "1543 FALSE123 balh balh",
+    )
+}
+
+#[test]
+fn short_flags_1() -> TestResult {
+    run_test(
+        r#"def foobar [-a: string, -b: string, -s: int] { if ( $s == 0 ) { echo $'($b)($a)' }}; foobar -a test -b case -s 0  "#,
+        "casetest",
+    )
+}
+
+#[test]
+fn short_flags_2() -> TestResult {
+    run_test(
+        r#"def foobar [-a: int, -b: string, -c: int] { $a + $c };foobar -b "balh balh" -a 10  -c 1 "#,
+        "11",
+    )
+}