v3 refactor (#1868)

* Move to v3

Co-authored-by: Ben Toogood <bentoogood@gmail.com>

cmd/cli/cli.go

@@ -0,0 +1,50 @@
+// Package cli is a urfave/cli implementation of the command
+package cli
+
+import (
+	"os"
+
+	"github.com/micro/cli/v2"
+	"github.com/micro/go-micro/v3/cmd"
+)
+
+type cliCmd struct {
+	opts cmd.Options
+	app  *cli.App
+}
+
+func (c *cliCmd) Init(opts ...cmd.Option) error {
+	for _, o := range opts {
+		o(&c.opts)
+	}
+	c.app.Name = c.opts.Name
+	c.app.Description = c.opts.Description
+	c.app.Version = c.opts.Version
+	c.app.Flags = c.opts.Flags
+	c.app.Commands = c.opts.Commands
+	c.app.Action = c.opts.Action
+	return nil
+}
+
+func (c *cliCmd) Options() cmd.Options {
+	return c.opts
+}
+
+func (c *cliCmd) App() *cli.App {
+	return c.app
+}
+
+func (c *cliCmd) Run() error {
+	return c.app.Run(os.Args)
+}
+
+func (c *cliCmd) String() string {
+	return "cli"
+}
+
+func NewCmd(opts ...cmd.Option) cmd.Cmd {
+	c := new(cliCmd)
+	c.app = cli.NewApp()
+	c.Init(opts...)
+	return c
+}