handle --version flag

cmd/schemalex-deploy/schemalex-deploy.go

@@ -3,15 +3,11 @@ package main
 import (
 	"flag"
 	"fmt"
-	"io"
 	"log"
-	"os"
 	"runtime"
 	"runtime/debug"
 
 	"github.com/shogo82148/schemalex-deploy"
-	"github.com/shogo82148/schemalex-deploy/diff"
-	"github.com/shogo82148/schemalex-deploy/internal/errors"
 )
 
 func main() {
@@ -21,9 +17,7 @@ func main() {
 }
 
 func _main() error {
-	var txn bool
 	var version bool
-	var outfile string
 
 	flag.Usage = func() {
 		// TODO: fill the usage
@@ -32,6 +26,7 @@ func _main() error {
 schemalex -version
 `, getVersion())
 	}
+	flag.BoolVar(&version, "version", false, "show the version")
 	flag.Parse()
 
 	if version {
@@ -45,38 +40,8 @@ schemalex -version
 		return nil
 	}
 
-	if flag.NArg() != 2 {
-		flag.Usage()
-		return errors.New("wrong number of arguments")
-	}
-
-	var dst io.Writer = os.Stdout
-	if len(outfile) > 0 {
-		f, err := os.OpenFile(outfile, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
-		if err != nil {
-			return errors.Wrapf(err, `failed to open file %s for writing`, outfile)
-		}
-		dst = f
-		defer f.Close()
-	}
-
-	fromSource, err := schemalex.NewSchemaSource(flag.Arg(0))
-	if err != nil {
-		return errors.Wrap(err, `failed to create schema source for "from"`)
-	}
-
-	toSource, err := schemalex.NewSchemaSource(flag.Arg(1))
-	if err != nil {
-		return errors.Wrap(err, `failed to create schema source for "to"`)
-	}
-
-	p := schemalex.New()
-	return diff.Sources(
-		dst,
-		fromSource,
-		toSource,
-		diff.WithTransaction(txn), diff.WithParser(p),
-	)
+	fmt.Println("TODO: implement")
+	return nil
 }
 
 func getVersion() string {