snek is a Go package that implements lightweight subcommands for a command-line application.
An example of a main entry point:
var Program = snek.NewProgram("", os.Args)
func main() {
Program.Main()
}An example of a subcommand:
func init() {
Program.Register(snek.Def{
Name: "echo",
Summary: "Display text.",
Arguments: "[-n] [TEXT...]",
Description: `Write the given arguments to standard output.`,
New: func() snek.Command { return &EchoCommand{} },
})
}
type EchoCommand struct {
NoNewline bool
}
func (c *EchoCommand) SetFlags(flags snek.FlagSet) {
flags.BoolVar(&c.NoNewline, "n", false, "Suppress trailing newline.")
}
func (c EchoCommand) Run(opt snek.Options) error {
if err := opt.ParseFlags(); err != nil {
return err
}
out := strings.Join(opt.Args(), " ")
fmt.Print(out)
if !c.NoNewline {
fmt.Print("\n")
}
return nil
}