Add pluralized aliases to config get commands

This changes the `get-credentials` command to `get-credential` to be
uniform with the other config commads. It then adds pluralized aliases
to `get-credential`, `get-cluster`, and `get-context`

Change-Id: Icb5a308f591589f5b68a8ad1c172c3b99ef3a4f1

cmd/config/get_authinfo.go

@@ -36,7 +36,7 @@ credentials if no name is provided.
 airshipctl config get-credentials
 
 # Display a specific user's credentials
-airshipctl config get-credentials exampleUser
+airshipctl config get-credential exampleUser
 `
 )
 
@@ -45,10 +45,11 @@ airshipctl config get-credentials exampleUser
 func NewGetAuthInfoCommand(rootSettings *environment.AirshipCTLSettings) *cobra.Command {
 	o := &config.AuthInfoOptions{}
 	cmd := &cobra.Command{
-		Use:     "get-credentials [NAME]",
+		Use:     "get-credential [NAME]",
 		Short:   "Get user credentials from the airshipctl config",
 		Long:    getAuthInfoLong[1:],
 		Example: getAuthInfoExample,
+		Aliases: []string{"get-credentials"},
 		Args:    cobra.MaximumNArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			airconfig := rootSettings.Config

cmd/config/get_cluster.go

@@ -36,7 +36,7 @@ Valid values for the --cluster-type flag are [ephemeral|target].
 
 	getClusterExample = `
 # List all clusters
-airshipctl config get-cluster
+airshipctl config get-clusters
 
 # Display a specific cluster
 airshipctl config get-cluster --cluster-type=ephemeral exampleCluster
@@ -52,6 +52,7 @@ func NewGetClusterCommand(rootSettings *environment.AirshipCTLSettings) *cobra.C
 		Short:   "Get cluster information from the airshipctl config",
 		Long:    getClusterLong[1:],
 		Example: getClusterExample,
+		Aliases: []string{"get-clusters"},
 		RunE: func(cmd *cobra.Command, args []string) error {
 			airconfig := rootSettings.Config
 			if len(args) == 1 {

cmd/config/get_context.go

@@ -32,7 +32,7 @@ Display information about contexts such as associated manifests, users, and clus
 
 	getContextExample = `
 # List all contexts
-airshipctl config get-context
+airshipctl config get-contexts
 
 # Display the current context
 airshipctl config get-context --current
@@ -51,6 +51,7 @@ func NewGetContextCommand(rootSettings *environment.AirshipCTLSettings) *cobra.C
 		Short:   "Get context information from the airshipctl config",
 		Long:    getContextLong[1:],
 		Example: getContextExample,
+		Aliases: []string{"get-contexts"},
 		RunE: func(cmd *cobra.Command, args []string) error {
 			airconfig := rootSettings.Config
 			if len(args) == 1 {

cmd/config/testdata/TestConfigGoldenOutput/config-cmd-with-help.golden

@@ -6,7 +6,7 @@ Usage:
 Available Commands:
   get-cluster     Get cluster information from the airshipctl config
   get-context     Get context information from the airshipctl config
-  get-credentials Get user credentials from the airshipctl config
+  get-credential  Get user credentials from the airshipctl config
   help            Help about any command
   import          Merge information from a kubernetes config file
   init            Generate initial configuration files for airshipctl

cmd/config/testdata/TestGetAuthInfoCmdGoldenOutput/missing.golden

@@ -1,6 +1,9 @@
 Error: Missing configuration: User credentials with name 'authinfoMissing'
 Usage:
-  get-credentials [NAME] [flags]
+  get-credential [NAME] [flags]
+
+Aliases:
+  get-credential, get-credentials
 
 Examples:
 
@@ -8,9 +11,9 @@ Examples:
 airshipctl config get-credentials
 
 # Display a specific user's credentials
-airshipctl config get-credentials exampleUser
+airshipctl config get-credential exampleUser
 
 
 Flags:
-  -h, --help   help for get-credentials
+  -h, --help   help for get-credential
 

cmd/config/testdata/TestGetClusterCmdGoldenOutput/missing.golden

@@ -2,10 +2,13 @@ Error: Missing configuration: Cluster with name 'clusterMissing' of type 'target
 Usage:
   get-cluster [NAME] [flags]
 
+Aliases:
+  get-cluster, get-clusters
+
 Examples:
 
 # List all clusters
-airshipctl config get-cluster
+airshipctl config get-clusters
 
 # Display a specific cluster
 airshipctl config get-cluster --cluster-type=ephemeral exampleCluster

cmd/config/testdata/TestGetContextCmdGoldenOutput/missing.golden

@@ -2,10 +2,13 @@ Error: Missing configuration: Context with name 'contextMissing'
 Usage:
   get-context [NAME] [flags]
 
+Aliases:
+  get-context, get-contexts
+
 Examples:
 
 # List all contexts
-airshipctl config get-context
+airshipctl config get-contexts
 
 # Display the current context
 airshipctl config get-context --current