Add showing file size option (Close #5)

cmd/root.go

@@ -35,8 +35,10 @@ var rootCmd = &cobra.Command{
 		}
 
 		withColorized, _ := cmd.Flags().GetBool("no-color")
+		withSize, _ := cmd.Flags().GetBool("filesize")
 		option := internal.PrintOption{
 			WithColorized: !withColorized,
+			WithSize:      withSize,
 		}
 		gcsTree, err := internal.NewGCSTree(ctx, client, bucket, &option)
 		if err != nil {
@@ -60,4 +62,5 @@ func Execute() {
 func init() {
 	rootCmd.Flags().BoolP("version", "v", false, "show the gcstree version")
 	rootCmd.Flags().BoolP("no-color", "n", false, "disable colorized outputs")
+	rootCmd.Flags().BoolP("filesize", "f", false, "show the file size")
 }

internal/gcstree.go

@@ -9,7 +9,7 @@ import (
 	"google.golang.org/api/iterator"
 )
 
-const GCSTREE_VERSION = "0.0.5"
+const GCSTREE_VERSION = "1.0.0"
 
 type GCSTree struct {
 	bucket  string

internal/tree.go

@@ -1,6 +1,7 @@
 package internal
 
 import (
+	"fmt"
 	"path/filepath"
 	"strings"
 
@@ -22,8 +23,14 @@ func tree(bucket string, objList []*storage.ObjectAttrs, option *PrintOption) (s
 			if s == "" {
 				continue
 			}
+			originalFilename := s
+			if option.WithSize {
+				if s == file {
+					s = fmt.Sprintf("[%4s]  %s", formatBytes(obj.Size), s)
+				}
+			}
 			if option.WithColorized {
-				if s != file {
+				if originalFilename != file {
 					s = color.BlueString("%s", s)
 				}
 			}

internal/util.go

@@ -0,0 +1,19 @@
+package internal
+
+import (
+	"fmt"
+)
+
+// ref: https://yourbasic.org/golang/formatting-byte-size-to-human-readable-format/
+func formatBytes(b int64) string {
+	const unit = 1000
+	if b < unit {
+		return fmt.Sprintf("%d", b)
+	}
+	div, exp := int64(unit), 0
+	for n := b / unit; n >= unit; n /= unit {
+		div *= unit
+		exp++
+	}
+	return fmt.Sprintf("%.1f%c", float64(b)/float64(div), "KMGTPE"[exp])
+}

internal/util_test.go

@@ -0,0 +1,19 @@
+package internal
+
+import "testing"
+
+func TestFormatBytes(t *testing.T) {
+	tests := map[int64]string{
+		999:       "999",
+		1024:      "1.0K",
+		1536:      "1.5K",
+		987654321: "987.7M",
+	}
+	for key, value := range tests {
+		got := formatBytes(key)
+		want := value
+		if got != want {
+			t.Fatalf("got: %v, want: %v\n", got, want)
+		}
+	}
+}