Add command "key list"

cmd/khepri/cmd_key.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/fd0/khepri"
+	"github.com/fd0/khepri/backend"
+)
+
+func list_keys(be backend.Server, key *khepri.Key) error {
+	tab := NewTable()
+	tab.Header = fmt.Sprintf("%-10s  %-10s  %-10s  %s", "ID", "User", "Host", "Created")
+	tab.RowFormat = "%-10s  %-10s  %-10s  %s"
+
+	plen, err := backend.PrefixLength(be, backend.Key)
+	if err != nil {
+		return err
+	}
+
+	backend.Each(be, backend.Key, func(id backend.ID, data []byte, err error) {
+		k := khepri.Key{}
+		err = json.Unmarshal(data, &k)
+		if err != nil {
+			return
+		}
+
+		tab.Rows = append(tab.Rows, []interface{}{id[:plen],
+			k.Username, k.Hostname, k.Created.Format(TimeFormat)})
+	})
+
+	tab.Print(os.Stdout)
+
+	return nil
+}
+
+func commandKey(be backend.Server, key *khepri.Key, args []string) error {
+	if len(args) < 1 {
+		return errors.New("usage: key [list]")
+	}
+
+	switch args[0] {
+	case "list":
+		return list_keys(be, key)
+	}
+
+	return nil
+}