weed shell: add fs.cd, fs.pwd to change to a directory and print current directory

weed/shell/command_fs_pwd.go

@@ -0,0 +1,32 @@
+package shell
+
+import (
+	"fmt"
+	"io"
+)
+
+func init() {
+	commands = append(commands, &commandFsPwd{})
+}
+
+type commandFsPwd struct {
+}
+
+func (c *commandFsPwd) Name() string {
+	return "fs.pwd"
+}
+
+func (c *commandFsPwd) Help() string {
+	return `print out current directory`
+}
+
+func (c *commandFsPwd) Do(args []string, commandEnv *commandEnv, writer io.Writer) (err error) {
+
+	fmt.Fprintf(writer, "http://%s:%d%s\n",
+		commandEnv.option.FilerHost,
+		commandEnv.option.FilerPort,
+		commandEnv.option.Directory,
+	)
+
+	return nil
+}