Add hidden commands

Author: ammario

command.go

@@ -19,6 +19,10 @@ type CommandSpec struct {
 	// Desc is the description of the command.
 	// The first line is used as an abbreviated description.
 	Desc string
+
+	// Hidden indicates that this command should not show up in it's parent's
+	// subcommand help.
+	Hidden bool
 }
 
 // ShortDesc returns the first line of Desc.

help.go

@@ -50,6 +50,10 @@ func renderHelp(cmd Command, fl *flag.FlagSet, w io.Writer) {
 			fmt.Fprint(w, "Commands:\n")
 		}
 		for _, cmd := range pc.Subcommands() {
+			if cmd.Spec().Hidden {
+				continue
+			}
+
 			fmt.Fprintf(w, "\t%v\t%v\n", cmd.Spec().Name, cmd.Spec().ShortDesc())
 		}
 	}