terraform: Adding utility methods

terraform/util.go

@@ -0,0 +1,12 @@
+package terraform
+
+// strSliceContains checks if a given string is contained in a slice
+// When anybody asks why Go needs generics, here you go.
+func strSliceContains(haystack []string, needle string) bool {
+	for _, s := range haystack {
+		if s == needle {
+			return true
+		}
+	}
+	return false
+}

terraform/util_test.go

@@ -0,0 +1,18 @@
+package terraform
+
+import "testing"
+
+func TestStrSliceContains(t *testing.T) {
+	if strSliceContains(nil, "foo") {
+		t.Fatalf("Bad")
+	}
+	if strSliceContains([]string{}, "foo") {
+		t.Fatalf("Bad")
+	}
+	if strSliceContains([]string{"bar"}, "foo") {
+		t.Fatalf("Bad")
+	}
+	if !strSliceContains([]string{"bar", "foo"}, "foo") {
+		t.Fatalf("Bad")
+	}
+}