Add command "doc flags" which generate a mardown array with all avail…

…able flags.

cmd/doc.go

@@ -0,0 +1,45 @@
+package cmd
+
+import (
+	"fmt"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"os"
+	"sort"
+	"strings"
+	"text/tabwriter"
+)
+
+func NewDocCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use: "doc",
+	}
+	cmd.AddCommand(NewDocFlagCommand())
+	return cmd
+}
+
+func NewDocFlagCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use: "flags",
+		Run: func(cmd *cobra.Command, args []string) {
+
+			w := tabwriter.NewWriter(os.Stdout, 0, 0, 1, ' ', tabwriter.Debug)
+			defer w.Flush()
+
+			allKeys := viper.GetViper().AllKeys()
+			sort.Strings(allKeys)
+
+			fmt.Fprintf(w, "\tFlag\tEnv var\tDefault value\tDescription\t\r\n")
+			fmt.Fprintf(w, "\t-\t-\t-\t-\t\r\n")
+			for _, key := range allKeys {
+				asEnvVar := strings.ToUpper(replacer.Replace(key))
+				flag := cmd.Parent().Parent().PersistentFlags().Lookup(key)
+				if flag == nil {
+					continue
+				}
+				fmt.Fprintf(w, "\t--%s\t%s\t%s\t%s\t\r\n", key, asEnvVar, flag.DefValue, flag.Usage)
+			}
+		},
+	}
+	return cmd
+}

cmd/root.go

@@ -54,6 +54,8 @@ var (
 	Version   = "develop"
 	BuildDate = "-"
 	Commit    = "-"
+
+	replacer = strings.NewReplacer(".", "_", "-", "_")
 )
 
 func NewRootCommand() *cobra.Command {
@@ -98,6 +100,8 @@ func NewRootCommand() *cobra.Command {
 	root.AddCommand(version)
 	root.AddCommand(stickersCmd)
 
+	root.AddCommand(NewDocCommand())
+
 	home, err := os.UserHomeDir()
 	if err != nil {
 		home = "/root"
@@ -147,7 +151,7 @@ func NewRootCommand() *cobra.Command {
 	viper.ReadInConfig()
 
 	viper.SetEnvPrefix("numary")
-	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_", "-", "_"))
+	viper.SetEnvKeyReplacer(replacer)
 	viper.AutomaticEnv()
 
 	return root