Add --list flag to config command to list all available configuration keys

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 ### Added
 - `config` command to get and set configuration options.
+  - `-l, --list` flag to list all available configuration keys.
 - `endpoint list|ls` command to print the endpoints list as a table.
   - `--format` flag to format output using a Go template.
 - `stack list|ls` command to print the stacks list as a table.

Dockerfile

@@ -3,6 +3,7 @@ FROM alpine
 ENV PSU_AUTHENTICATION_PASSWORD="" \
   PSU_AUTHENTICATION_USER="" \
   PSU_CONFIG="" \
+  PSU_CONFIG_LIST="" \
   PSU_CONNECTION_INSECURE="" \
   PSU_CONNECTION_TIMEOUT="" \
   PSU_CONNECTION_URL="" \

cmd/config.go

@@ -8,6 +8,7 @@ import (
 	"github.com/spf13/viper"
 	"log"
 	"os"
+	"sort"
 )
 
 // configCmd represents the config command
@@ -15,8 +16,18 @@ var configCmd = &cobra.Command{
 	Use:   "config KEY [VALUE]",
 	Short: "Get and set configuration options",
 	Example: "psu config user admin",
-	Args:    cobra.RangeArgs(1, 2),
 	Run: func(cmd *cobra.Command, args []string) {
+		if viper.GetBool("config.list") {
+			// List config keys
+			keys := viper.AllKeys()
+			sort.Slice(keys, func(i, j int) bool {
+				return keys[i] < keys[j]
+			})
+			for _, key := range keys {
+				fmt.Println(key)
+			}
+		} else {
+			if len(args) >= 1 {
 				// Check if it's a valid key
 				var keyExists bool
 				for _, key := range viper.AllKeys() {
@@ -74,9 +85,14 @@ var configCmd = &cobra.Command{
 						common.CheckError(configWritingErr)
 					}
 				}
+			}
+		}
 	},
 }
 
 func init() {
 	rootCmd.AddCommand(configCmd)
+
+	configCmd.Flags().BoolP("list", "l", false, "list all config keys")
+	viper.BindPFlag("config.list", configCmd.Flags().Lookup("list"))
 }