add viper and config management

cmd/root.go

@@ -4,18 +4,38 @@ import (
 	"fmt"
 	"os"
 
-	"git.bloy.org/mike/gotest/version"
+	"github.com/kyoh86/xdg"
 	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
 )
 
+var cfgFile string
+
 var rootCmd = &cobra.Command{
 	Use:   "gotest",
 	Short: "Gotest is a thing for testing out go packaging and boilerplate",
 	Long:  "An Experiment",
-	Run: func(cmd *cobra.Command, args []string) {
+}
-		fmt.Println("Hello world!")
+
-	},
+func init() {
-	Version: version.Version.String(),
+	cobra.OnInitialize(initConfig)
+	viper.SetDefault("port", 8000)
+	rootCmd.PersistentFlags().StringVarP(&cfgFile, "config", "c",
+		"", "Full path to config file")
+}
+
+func initConfig() {
+	viper.SetEnvPrefix("gotest")
+	viper.AutomaticEnv()
+	if cfgFile != "" {
+		viper.SetConfigFile(cfgFile)
+	} else {
+		for _, p := range xdg.AllConfigDirs() {
+			viper.AddConfigPath(p)
+		}
+		viper.SetConfigName("gotest")
+	}
+	viper.ReadInConfig()
 }
 
 // Execute the root command

cmd/version.go

@@ -0,0 +1,33 @@
+package cmd
+
+import (
+	"fmt"
+
+	"git.bloy.org/mike/gotest/version"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var showCfg bool
+
+func init() {
+	rootCmd.AddCommand(versionCmd)
+	versionCmd.Flags().BoolVarP(&showCfg, "long", "l", false,
+		"Show the configuration as well as the version")
+}
+
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Print the version number",
+	Long:  "All software has versions. This is how you see it.",
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Printf("This is GoTest %s\n\n", version.Version)
+		fmt.Printf("  Config location: %s\n", viper.ConfigFileUsed())
+		if showCfg {
+			fmt.Println("\nConfiguration Data:")
+			for _, key := range viper.AllKeys() {
+				fmt.Printf("    %s: %t\n", key, viper.Get(key))
+			}
+		}
+	},
+}

go.mod

@@ -2,4 +2,8 @@ module git.bloy.org/mike/gotest
 
 go 1.12
 
-require github.com/spf13/cobra v0.0.5
+require (
+	github.com/kyoh86/xdg v1.0.0
+	github.com/spf13/cobra v0.0.5
+	github.com/spf13/viper v1.3.2
+)

go.sum

@@ -4,29 +4,46 @@ github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc
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