add shell command to list all collections

weed/shell/command_collection_list.go

@@ -0,0 +1,39 @@
+package shell
+
+import (
+	"context"
+	"fmt"
+	"io"
+)
+
+func init() {
+	commands = append(commands, &commandCollectionList{})
+}
+
+type commandCollectionList struct {
+}
+
+func (c *commandCollectionList) Name() string {
+	return "collection.list"
+}
+
+func (c *commandCollectionList) Help() string {
+	return "\t\t # list all collections"
+}
+
+func (c *commandCollectionList) Do(args []string, commandEnv *commandEnv, writer io.Writer) error {
+
+	resp, err := commandEnv.masterClient.CollectionList(context.Background())
+
+	if err != nil {
+		return err
+	}
+
+	for _, c := range resp.Collections {
+		fmt.Fprintf(writer, "collection:\"%s\"\n", c.GetName())
+	}
+
+	fmt.Fprintf(writer, "Total %d collections.\n", len(resp.Collections))
+
+	return nil
+}