cobra: check error return values

cobra/cmd/add.go

@@ -40,7 +40,7 @@ Example: cobra add server -> resulting in a new cmd/server.go`,
 
 		Run: func(cmd *cobra.Command, args []string) {
 			if len(args) < 1 {
-				er("add needs a name for the command")
+				er(fmt.Errorf("add needs a name for the command"))
 			}
 
 			wd, err := os.Getwd()
@@ -72,7 +72,7 @@ Example: cobra add server -> resulting in a new cmd/server.go`,
 func init() {
 	addCmd.Flags().StringVarP(&packageName, "package", "t", "", "target package name (e.g. github.com/spf13/hugo)")
 	addCmd.Flags().StringVarP(&parentName, "parent", "p", "rootCmd", "variable name of parent command for this command")
-	addCmd.Flags().MarkDeprecated("package", "this operation has been removed.")
+	er(addCmd.Flags().MarkDeprecated("package", "this operation has been removed."))
 }
 
 // validateCmdName returns source without any dashes and underscore.

cobra/cmd/add_test.go

@@ -14,10 +14,8 @@ func TestGoldenAddCmd(t *testing.T) {
 	}
 	defer os.RemoveAll(command.AbsolutePath)
 
-	command.Project.Create()
-	if err := command.Create(); err != nil {
-		t.Fatal(err)
-	}
+	er(command.Project.Create())
+	er(command.Create())
 
 	generatedFile := fmt.Sprintf("%s/cmd/%s.go", command.AbsolutePath, command.CmdName)
 	goldenFile := fmt.Sprintf("testdata/%s.go.golden", command.CmdName)

cobra/cmd/helpers.go

@@ -60,8 +60,10 @@ func init() {
 }
 
 func er(msg interface{}) {
-	fmt.Println("Error:", msg)
-	os.Exit(1)
+	if msg != nil {
+		fmt.Println("Error:", msg)
+		os.Exit(1)
+	}
 }
 
 // isEmpty checks if a given path is empty.

cobra/cmd/init.go

@@ -74,5 +74,5 @@ Init will not use an existing directory with contents.`,
 
 func init() {
 	initCmd.Flags().StringVar(&pkgName, "pkg-name", "", "fully qualified pkg name")
-	initCmd.MarkFlagRequired("pkg-name")
+	er(initCmd.MarkFlagRequired("pkg-name"))
 }

cobra/cmd/init_test.go

@@ -23,9 +23,7 @@ func TestGoldenInitCmd(t *testing.T) {
 	project := getProject()
 	defer os.RemoveAll(project.AbsolutePath)
 
-	if err := project.Create(); err != nil {
-		t.Fatal(err)
-	}
+	er(project.Create())
 
 	expectedFiles := []string{"LICENSE", "main.go", "cmd/root.go"}
 	for _, f := range expectedFiles {

cobra/cmd/licenses.go

@@ -16,6 +16,7 @@
 package cmd
 
 import (
+	"fmt"
 	"strings"
 	"time"
 
@@ -92,7 +93,7 @@ func copyrightLine() string {
 func findLicense(name string) License {
 	found := matchLicense(name)
 	if found == "" {
-		er("unknown license: " + name)
+		er(fmt.Errorf("unknown license: " + name))
 	}
 	return Licenses[found]
 }

cobra/cmd/project.go

@@ -49,7 +49,7 @@ func (p *Project) Create() error {
 
 	// create cmd/root.go
 	if _, err = os.Stat(fmt.Sprintf("%s/cmd", p.AbsolutePath)); os.IsNotExist(err) {
-		os.Mkdir(fmt.Sprintf("%s/cmd", p.AbsolutePath), 0751)
+		er(os.Mkdir(fmt.Sprintf("%s/cmd", p.AbsolutePath), 0751))
 	}
 	rootFile, err := os.Create(fmt.Sprintf("%s/cmd/root.go", p.AbsolutePath))
 	if err != nil {

cobra/cmd/root.go

@@ -47,8 +47,8 @@ func init() {
 	rootCmd.PersistentFlags().StringP("author", "a", "YOUR NAME", "author name for copyright attribution")
 	rootCmd.PersistentFlags().StringVarP(&userLicense, "license", "l", "", "name of license for the project")
 	rootCmd.PersistentFlags().Bool("viper", true, "use Viper for configuration")
-	viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author"))
-	viper.BindPFlag("useViper", rootCmd.PersistentFlags().Lookup("viper"))
+	er(viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author")))
+	er(viper.BindPFlag("useViper", rootCmd.PersistentFlags().Lookup("viper")))
 	viper.SetDefault("author", "NAME HERE <EMAIL ADDRESS>")
 	viper.SetDefault("license", "apache")