feat(cmd): Replace 'helm show' with 'helm show all'

As part of #6552

The is a break in compatibility because 'helm show' is no longer a
valid command on its own; what it used to do is now achieved with
'helm show all'.

This change avoids confusion between chart reference and subcommands.
It also opens the door to dynamic shell comnpletion.

Signed-off-by: Marc Khouzam <marc.khouzam@montreal.ca>

cmd/helm/show.go

@@ -27,10 +27,12 @@ import (
 )
 
 const showDesc = `
-This command inspects a chart and displays information. It takes a chart reference
+This command consists of multiple subcommands to display information about a chart
-('example/drupal'), a full path to a directory or packaged chart, or a URL.
+`
 
-Inspect prints the contents of the Chart.yaml file and the values.yaml file.
+const showAllDesc = `
+This command inspects a chart (directory, file, or URL) and displays all its content
+(values.yaml, Charts.yaml, README)
 `
 
 const showValuesDesc = `
@@ -52,12 +54,20 @@ func newShowCmd(out io.Writer) *cobra.Command {
 	client := action.NewShow(action.ShowAll)
 
 	showCommand := &cobra.Command{
-		Use:     "show [CHART]",
+		Use:     "show",
-		Short:   "inspect a chart",
+		Short:   "show information of a chart",
 		Aliases: []string{"inspect"},
 		Long:    showDesc,
-		Args:    require.ExactArgs(1),
+		Args:    require.NoArgs,
+	}
+
+	all := &cobra.Command{
+		Use:   "all [CHART]",
+		Short: "shows all information of the chart",
+		Long:  showAllDesc,
+		Args:  require.ExactArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
+			client.OutputFormat = action.ShowAll
 			cp, err := client.ChartPathOptions.LocateChart(args[0], settings)
 			if err != nil {
 				return err
@@ -73,7 +83,7 @@ func newShowCmd(out io.Writer) *cobra.Command {
 
 	valuesSubCmd := &cobra.Command{
 		Use:   "values [CHART]",
-		Short: "shows values for this chart",
+		Short: "shows the chart's values",
 		Long:  showValuesDesc,
 		Args:  require.ExactArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
@@ -93,7 +103,7 @@ func newShowCmd(out io.Writer) *cobra.Command {
 
 	chartSubCmd := &cobra.Command{
 		Use:   "chart [CHART]",
-		Short: "shows the chart",
+		Short: "shows the chart's definition",
 		Long:  showChartDesc,
 		Args:  require.ExactArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
@@ -131,12 +141,9 @@ func newShowCmd(out io.Writer) *cobra.Command {
 		},
 	}
 
-	cmds := []*cobra.Command{showCommand, readmeSubCmd, valuesSubCmd, chartSubCmd}
+	cmds := []*cobra.Command{all, readmeSubCmd, valuesSubCmd, chartSubCmd}
 	for _, subCmd := range cmds {
 		addChartPathOptionsFlags(subCmd.Flags(), &client.ChartPathOptions)
-	}
-
-	for _, subCmd := range cmds[1:] {
 		showCommand.AddCommand(subCmd)
 	}