add shell command to list all collections

weed/shell/commands.go

@@ -0,0 +1,27 @@
+package shell
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/wdclient"
+	"google.golang.org/grpc"
+	"io"
+)
+
+type ShellOptions struct {
+	Masters        *string
+	GrpcDialOption grpc.DialOption
+}
+
+type commandEnv struct {
+	env          map[string]string
+	masterClient *wdclient.MasterClient
+}
+
+type command interface {
+	Name() string
+	Help() string
+	Do([]string, *commandEnv, io.Writer) error
+}
+
+var (
+	commands = []command{}
+)