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

weed/shell/commands.go

@@ -1,14 +1,23 @@
 package shell
 
 import (
+	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
 	"google.golang.org/grpc"
 	"io"
+	"net/url"
+	"path/filepath"
+	"strconv"
+	"strings"
 )
 
 type ShellOptions struct {
 	Masters        *string
 	GrpcDialOption grpc.DialOption
+	// shell transient context
+	FilerHost string
+	FilerPort int64
+	Directory string
 }
 
 type commandEnv struct {
@@ -26,3 +35,32 @@ type command interface {
 var (
 	commands = []command{}
 )
+
+func (ce *commandEnv) parseUrl(input string) (filerServer string, filerPort int64, path string, err error) {
+	if strings.HasPrefix(input, "http") {
+		return parseFilerUrl(input)
+	}
+	if !strings.HasPrefix(input, "/") {
+		input = filepath.ToSlash(filepath.Join(ce.option.Directory, input))
+	}
+	return ce.option.FilerHost, ce.option.FilerPort, input, err
+}
+
+func parseFilerUrl(entryPath string) (filerServer string, filerPort int64, path string, err error) {
+	if strings.HasPrefix(entryPath, "http") {
+		var u *url.URL
+		u, err = url.Parse(entryPath)
+		if err != nil {
+			return
+		}
+		filerServer = u.Hostname()
+		portString := u.Port()
+		if portString != "" {
+			filerPort, err = strconv.ParseInt(portString, 10, 32)
+		}
+		path = u.Path
+	} else {
+		err = fmt.Errorf("path should have full url http://<filer_server>:<port>/path/to/dirOrFile : %s", entryPath)
+	}
+	return
+}