Fix exit code

cmd/bargraph.go

@@ -4,7 +4,6 @@ import (
 	"rare/cmd/helpers"
 	"rare/pkg/aggregation"
 	"rare/pkg/csv"
-	"rare/pkg/logger"
 	"rare/pkg/multiterm/termrenderers"
 
 	"github.com/urfave/cli/v2"
@@ -28,7 +27,7 @@ func bargraphFunction(c *cli.Context) error {
 	writer.Stacked = stacked
 	if c.IsSet(helpers.ScaleFlag.Name) {
 		if stacked {
-			logger.Fatal("Unable to set graph scale on stacked graphs")
+			return cli.Exit("Unable to set graph scale on stacked graphs", helpers.ExitCodeInvalidUsage)
 		}
 		writer.Scaler = helpers.BuildScalerOrFail(scaleName)
 	}

cmd/bargraph_test.go

@@ -1,6 +1,10 @@
 package cmd
 
-import "testing"
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
 
 func TestBarGraph(t *testing.T) {
 	testCommandSet(t, bargraphCommand(),
@@ -9,3 +13,8 @@ func TestBarGraph(t *testing.T) {
 		`-o - -m "(.+) (\d+)" -e "{$ {1} {2}}" --scale log10 testdata/graph.txt`,
 	)
 }
+
+func TestBarGraphCantScaleAndStack(t *testing.T) {
+	err := testCommand(bargraphCommand(), "--stacked --scale log10 testdata/graph.txt")
+	assert.Error(t, err)
+}