migrate bbolt info command to cobra style

cmd/bbolt/command_info.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+
+	bolt "go.etcd.io/bbolt"
+)
+
+func newInfoCobraCommand() *cobra.Command {
+	infoCmd := &cobra.Command{
+		Use:   "info PATH",
+		Short: "Info prints basic information about the Bolt database at PATH.",
+		Args: func(cmd *cobra.Command, args []string) error {
+			if len(args) == 0 {
+				return errors.New("db file path not provided")
+			}
+			if len(args) > 1 {
+				return errors.New("too many arguments, only accept db file path")
+			}
+			return nil
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			path := args[0]
+			if path == "" {
+				return ErrPathRequired
+			} else if _, err := os.Stat(path); os.IsNotExist(err) {
+				return ErrFileNotFound
+			}
+
+			// Open the database.
+			db, err := bolt.Open(path, 0666, &bolt.Options{ReadOnly: true})
+			if err != nil {
+				return err
+			}
+			defer db.Close()
+
+			// Print basic database info.
+			info := db.Info()
+			fmt.Fprintf(os.Stdout, "Page size: %d\n", info.PageSize)
+
+			return nil
+		},
+	}
+
+	fs := pflag.NewFlagSet("", pflag.ContinueOnError)
+	fs.Bool("h", false, "")
+
+	infoCmd.Flags().AddFlagSet(fs)
+
+	return infoCmd
+}

cmd/bbolt/command_root.go

@@ -19,6 +19,7 @@ func NewRootCommand() *cobra.Command {
 	rootCmd.AddCommand(
 		newVersionCobraCommand(),
 		newSurgeryCobraCommand(),
+		newInfoCobraCommand(),
 	)
 
 	return rootCmd

cmd/bbolt/command_version.go

@@ -5,6 +5,7 @@ import (
 	"runtime"
 
 	"github.com/spf13/cobra"
+
 	"go.etcd.io/bbolt/version"
 )
 

cmd/bbolt/main.go

@@ -130,8 +130,6 @@ func (m *Main) Run(args ...string) error {
 		return newPageItemCommand(m).Run(args[1:]...)
 	case "get":
 		return newGetCommand(m).Run(args[1:]...)
-	case "info":
-		return newInfoCommand(m).Run(args[1:]...)
 	case "keys":
 		return newKeysCommand(m).Run(args[1:]...)
 	case "page":
@@ -252,61 +250,6 @@ return after all pages have been checked.
 `, "\n")
 }
 
-// infoCommand represents the "info" command execution.
-type infoCommand struct {
-	baseCommand
-}
-
-// newInfoCommand returns a infoCommand.
-func newInfoCommand(m *Main) *infoCommand {
-	c := &infoCommand{}
-	c.baseCommand = m.baseCommand
-	return c
-}
-
-// Run executes the command.
-func (cmd *infoCommand) Run(args ...string) error {
-	// Parse flags.
-	fs := flag.NewFlagSet("", flag.ContinueOnError)
-	help := fs.Bool("h", false, "")
-	if err := fs.Parse(args); err != nil {
-		return err
-	} else if *help {
-		fmt.Fprintln(cmd.Stderr, cmd.Usage())
-		return ErrUsage
-	}
-
-	// Require database path.
-	path := fs.Arg(0)
-	if path == "" {
-		return ErrPathRequired
-	} else if _, err := os.Stat(path); os.IsNotExist(err) {
-		return ErrFileNotFound
-	}
-
-	// Open the database.
-	db, err := bolt.Open(path, 0600, &bolt.Options{ReadOnly: true})
-	if err != nil {
-		return err
-	}
-	defer db.Close()
-
-	// Print basic database info.
-	info := db.Info()
-	fmt.Fprintf(cmd.Stdout, "Page Size: %d\n", info.PageSize)
-
-	return nil
-}
-
-// Usage returns the help message.
-func (cmd *infoCommand) Usage() string {
-	return strings.TrimLeft(`
-usage: bolt info PATH
-
-Info prints basic information about the Bolt database at PATH.
-`, "\n")
-}
-
 // dumpCommand represents the "dump" command execution.
 type dumpCommand struct {
 	baseCommand

cmd/bbolt/main_test.go

@@ -32,8 +32,9 @@ func TestInfoCommand_Run(t *testing.T) {
 	defer requireDBNoChange(t, dbData(t, db.Path()), db.Path())
 
 	// Run the info command.
-	m := NewMain()
-	if err := m.Run("info", db.Path()); err != nil {
+	m := main.NewRootCommand()
+	m.SetArgs([]string{"info", db.Path()})
+	if err := m.Execute(); err != nil {
 		t.Fatal(err)
 	}
 }