refactor: remove unused package (#8)

Author: amyXia1994

main.go

@@ -1,5 +1,5 @@
 package main
 
-import kcl_openapi "kusionstack.io/kcl-openapi/pkg/cmds/kcl-openapi"
+import "kusionstack.io/kcl-openapi/pkg/cmds"
 
-func main() { kcl_openapi.Main() }
+func main() { cmds.Main() }

pkg/cmds/generate.go

@@ -1,14 +1,38 @@
-package generate
+package cmds
 
 import (
+	"io/ioutil"
 	"log"
-
-	"github.com/jessevdk/go-flags"
+	"os"
 
 	crdGen "kusionstack.io/kcl-openapi/pkg/kube_resource/generator"
 	"kusionstack.io/kcl-openapi/pkg/swagger/generator"
+
+	"github.com/go-openapi/loads"
+	"github.com/go-openapi/loads/fmts"
+	"github.com/jessevdk/go-flags"
 )
 
+func init() {
+	loads.AddLoader(fmts.YAMLMatcher, fmts.YAMLDoc)
+}
+
+var opts struct {
+	// General options applicable to all commands
+	Quiet   func()       `long:"quiet" short:"q" description:"silence logs"`
+	LogFile func(string) `long:"log-output" description:"redirect logs to file" value-name:"LOG-FILE"`
+}
+
+// Generate command to group all generator commands together
+type Generate struct {
+	Model *Model `command:"model"`
+}
+
+// Model is the generate model file command
+type Model struct {
+	Options options
+}
+
 type options struct {
 	Spec                 flags.Filename `long:"spec" short:"f" description:"the path to the OpenAPI spec file. It should be a local path in your file system" group:"shared"`
 	Crd                  bool           `long:"crd" description:"if the spec file is a kubernetes CRD" group:"shared"`
@@ -18,9 +42,37 @@ type options struct {
 	DisableKeepSpecOrder bool           `long:"disable-keep-spec-order" description:"disable to keep schema properties order identical to spec file"`
 }
 
-// Model is the generate model file command
-type Model struct {
-	Options options
+func Main() {
+	parser := flags.NewParser(&opts, flags.Default)
+	parser.ShortDescription = "helps you to maintain your KCL API automatically"
+	parser.LongDescription = `kcl-openapi helps you to generate your KCL model code from OpenAPI spec or Kubernetes CRD.`
+
+	genpar, err := parser.AddCommand("generate", "generate KCL code", "generate kcl code from the OpenAPI spec file", &Generate{})
+	if err != nil {
+		log.Fatalln(err)
+	}
+	for _, cmd := range genpar.Commands() {
+		switch cmd.Name {
+		case "model":
+			cmd.ShortDescription = "generate KCL models from OpenAPI spec"
+			cmd.LongDescription = cmd.ShortDescription
+		}
+	}
+
+	opts.Quiet = func() {
+		log.SetOutput(ioutil.Discard)
+	}
+	opts.LogFile = func(logfile string) {
+		f, err := os.OpenFile(logfile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
+		if err != nil {
+			log.Fatalf("cannot write to file %s: %v", logfile, err)
+		}
+		log.SetOutput(f)
+	}
+
+	if _, err := parser.Parse(); err != nil {
+		os.Exit(1)
+	}
 }
 
 // Execute generates a model file