Store the length of Args when a -- is found in commandline

This allows a program to know what args came before the -- and what args
came after.

1 files changed, 9 insertions, 0 deletions

diff --git a/flag_test.go b/flag_test.go
index 1b4005c..e17b2aa 100644
--- a/flag_test.go
+++ b/flag_test.go
@@ -387,6 +387,9 @@ func TestShorthand(t *testing.T) {
 	} else if f.Args()[1] != notaflag {
 		t.Errorf("expected argument %q got %q", notaflag, f.Args()[1])
 	}
+	if f.ArgsLenAtDash() != 1 {
+		t.Errorf("expected argsLenAtDash %d got %d", f.ArgsLenAtDash(), 1)
+	}
 }
 
 func TestParse(t *testing.T) {
@@ -424,6 +427,9 @@ func TestChangedHelper(t *testing.T) {
 	if f.Changed("invalid") {
 		t.Errorf("--invalid was changed!")
 	}
+	if f.ArgsLenAtDash() != -1 {
+		t.Errorf("Expected argsLenAtDash: %d but got %d", -1, f.ArgsLenAtDash())
+	}
 }
 
 func replaceSeparators(name string, from []string, to string) string {
@@ -713,6 +719,9 @@ func TestTermination(t *testing.T) {
 	if f.Args()[1] != arg2 {
 		t.Errorf("expected argument %q got %q", arg2, f.Args()[1])
 	}
+	if f.ArgsLenAtDash() != 0 {
+		t.Errorf("expected argsLenAtDash %d got %d", 0, f.ArgsLenAtDash())
+	}
 }
 
 func TestDeprecatedFlagInDocs(t *testing.T) {