Implement info command

Author: AmrSaber

src/cmd/backup.go

@@ -11,11 +11,11 @@ import (
 var backupCmd = &cobra.Command{
 	Use:   "backup",
 	Short: "Create DB backup",
-	Long: `Creates a backup for the database.
+	Long: `Creates a backup for the database. See info command for backup location.
 
-	Created backup can be later restored using 'kv db restore'.
+Created backup can be later restored using 'kv db restore'.
 
-	Only a single backup is kept, so creating a backup removes existing backups.
+Only a single backup is kept, so creating a backup removes existing backups.
 `,
 	Example: `  # Backup DB
 	kv db backup

src/cmd/implode.go

@@ -8,7 +8,7 @@ import (
 // implodeCmd represents the implode command
 var implodeCmd = &cobra.Command{
 	Use:   "implode",
-	Short: "Permanently delete all keys and history",
+	Short: "Permanently delete all keys, history, and backups",
 	Long: `Permanently delete all keys and their history from the store.
 
 This command is not suitable to run concurrently with other commands,

src/cmd/import.go

@@ -23,9 +23,16 @@ var importCmd = &cobra.Command{
 The imported file must be a valid database file created with the 'export' command.
 This will completely replace the current database with the imported one.
 
-WARNING: This operation is destructive. The current database will be backed up
-to <db-path>.backup before importing. You can restore from this backup using
-the 'kv db restore' command if needed.
+WARNING: This operation is destructive.
+
+If --backup flag is set the current database will be backed up
+to <db-path>.backup before importing.
+You can restore from this backup using the 'kv db restore' command if needed.
+
+If --backup flag is not passed, a temp backup will be created in case import fails.
+It will be automatically deleted if import fails.
+
+For (persistent) backup location, see 'info' command.
 
 Use "-" as the file path to read from stdin (useful for piping).`,
 	Example: `  # Import database from a file

src/cmd/info.go

@@ -0,0 +1,57 @@
+package cmd
+
+import (
+	"encoding/json"
+	"path/filepath"
+
+	"github.com/AmrSaber/kv/src/common"
+	"github.com/spf13/cobra"
+	"gopkg.in/yaml.v2"
+)
+
+var infoFlags = struct{ output string }{}
+
+var infoCmd = &cobra.Command{
+	Use:   "info",
+	Short: "Displays kv info",
+	Long: `Displays kv info and paths.
+Note that "backup path" does not mean there is a backup. There might be, there might not.
+It just displays the path where a backup would be if there were one.`,
+
+	Args: cobra.NoArgs,
+	Run: func(cmd *cobra.Command, args []string) {
+		type Info struct {
+			DataDir    string `json:"dataDir" yaml:"data-dir"`
+			BackupPath string `json:"backupPath" yaml:"backup-path"`
+
+			Config common.Config `json:"config" yaml:"config"`
+		}
+
+		info := Info{
+			DataDir:    filepath.Dir(common.GetDBPath()),
+			BackupPath: common.GetDefaultBackupPath(),
+			Config:     common.ReadConfig(),
+		}
+
+		switch infoFlags.output {
+		case "yaml":
+			output, _ := yaml.Marshal(info)
+			common.Stdout.Println(string(output))
+		case "json":
+			output, _ := json.MarshalIndent(info, "", "  ")
+			common.Stdout.Println(string(output))
+		default:
+			common.Fail("Unsupported format %q", infoFlags.output)
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(infoCmd)
+
+	infoCmd.Flags().StringVarP(&infoFlags.output, "output", "o", "yaml", "Print format, options: json, yaml")
+	_ = infoCmd.RegisterFlagCompletionFunc(
+		"output",
+		cobra.FixedCompletions([]string{"json", "yaml"}, cobra.ShellCompDirectiveDefault),
+	)
+}

src/cmd/list.go

@@ -190,7 +190,7 @@ func init() {
 	listCmd.Flags().BoolVarP(&listFlags.noValues, "no-values", "v", false, "Hide values")
 	listCmd.Flags().BoolVarP(&listFlags.deleted, "deleted", "d", false, "List deleted keys")
 	listCmd.Flags().StringVarP(&listFlags.output, "output", "o", "table", "Print format, options: json, yaml, table")
-	listCmd.RegisterFlagCompletionFunc(
+	_ = listCmd.RegisterFlagCompletionFunc(
 		"output",
 		cobra.FixedCompletions([]string{"json", "yaml", "table"}, cobra.ShellCompDirectiveDefault),
 	)

src/common/config.go

@@ -8,8 +8,8 @@ import (
 )
 
 type Config struct {
-	PruneHistoryAfterDays int `yaml:"prune-history-after-days,omitempty"`
-	HistoryLength         int `yaml:"history-length,omitempty"`
+	PruneHistoryAfterDays int `json:"pruneHistoryAfterDays" yaml:"prune-history-after-days,omitempty"`
+	HistoryLength         int `json:"historyLength" yaml:"history-length,omitempty"`
 }
 
 func (c Config) String() string {