clair vele help cli

Signed-off-by: Weiping Cai <weiping.cai@daocloud.io>

pkg/commands/cli.go

@@ -81,6 +81,7 @@ func NewCommand() *cobra.Command {
 		NewDashboardCommand(commandArgs, ioStream, fake.FrontendSource),
 		NewCompletionCommand(),
 		NewVersionCommand(),
+		NewHelpCommand(),
 	)
 
 	// this is for mute klog
@@ -91,19 +92,6 @@ func NewCommand() *cobra.Command {
 	return cmds
 }
 
-// PrintHelpByTag print custom defined help message
-func PrintHelpByTag(cmd *cobra.Command, all []*cobra.Command, tag string) {
-	cmd.Printf("  %s:\n\n", tag)
-	table := newUITable()
-	for _, c := range all {
-		if val, ok := c.Annotations[types.TagCommandType]; ok && val == tag {
-			table.AddRow("    "+c.Use, c.Long)
-		}
-	}
-	cmd.Println(table.String())
-	cmd.Println()
-}
-
 // NewVersionCommand print client version
 func NewVersionCommand() *cobra.Command {
 	return &cobra.Command{

pkg/commands/help.go

@@ -0,0 +1,49 @@
+package commands
+
+import (
+	"github.com/oam-dev/kubevela/apis/types"
+
+	"github.com/spf13/cobra"
+)
+
+// NewHelpCommand get any command help
+func NewHelpCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:                   "help [command] ",
+		DisableFlagsInUseLine: true,
+		Short:                 "Help about any command",
+		Run:                   RunHelp,
+	}
+	return cmd
+}
+
+// RunHelp exec help [command]
+func RunHelp(cmd *cobra.Command, args []string) {
+	if len(args) == 0 {
+		allCommands := cmd.Root().Commands()
+		// print error message at first, since it can contain suggestions
+		cmd.Printf("A Highly Extensible Platform Engine based on Kubernetes and Open Application Model.\n\nUsage:\n  vela [flags]\n  vela [command]\n\nAvailable Commands:\n\n")
+		PrintHelpByTag(cmd, allCommands, types.TypeStart)
+		PrintHelpByTag(cmd, allCommands, types.TypeApp)
+		PrintHelpByTag(cmd, allCommands, types.TypeCap)
+		PrintHelpByTag(cmd, allCommands, types.TypeSystem)
+	} else {
+		foundCmd, _, err := cmd.Root().Find(args)
+		if foundCmd != nil && err == nil {
+			foundCmd.HelpFunc()(cmd, args)
+		}
+	}
+}
+
+// PrintHelpByTag print custom defined help message
+func PrintHelpByTag(cmd *cobra.Command, all []*cobra.Command, tag string) {
+	cmd.Printf("  %s:\n\n", tag)
+	table := newUITable()
+	for _, c := range all {
+		if val, ok := c.Annotations[types.TagCommandType]; ok && val == tag {
+			table.AddRow("    "+c.Use, c.Long)
+		}
+	}
+	cmd.Println(table.String())
+	cmd.Println()
+}