// Implementation of the help command for Gondola apps
func help(ctx *app.Context) {
var cmd string
ctx.ParseIndexValue(0, &cmd)
if cmd != "" {
c := strings.ToLower(cmd)
if _, ok := commands[c]; ok {
fmt.Fprintf(os.Stderr, "Help for command %s:\n", c)
commandHelp(c, -1, os.Stderr)
} else {
fmt.Fprintf(os.Stderr, "No such command %q\n", cmd)
}
} else {
fmt.Fprintf(os.Stderr, "Commands:\n")
commandsHelp(os.Stderr)
}
}