add shell command to list all collections

weed/shell/shell_liner.go

@@ -0,0 +1,143 @@
+package shell
+
+import (
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/wdclient"
+	"os"
+	"regexp"
+	"strings"
+
+	"github.com/peterh/liner"
+	"sort"
+)
+
+var (
+	line        *liner.State
+	historyPath = "/tmp/weed-shell"
+)
+
+func RunShell(options ShellOptions) {
+
+	line = liner.NewLiner()
+	defer line.Close()
+
+	line.SetCtrlCAborts(true)
+
+	setCompletionHandler()
+	loadHisotry()
+
+	defer saveHisotry()
+
+	reg, _ := regexp.Compile(`'.*?'|".*?"|\S+`)
+
+	commandEnv := &commandEnv{
+		env: make(map[string]string),
+		masterClient: wdclient.NewMasterClient(context.Background(),
+			options.GrpcDialOption, "shell", strings.Split(*options.Masters, ",")),
+	}
+
+	go commandEnv.masterClient.KeepConnectedToMaster()
+	commandEnv.masterClient.WaitUntilConnected()
+
+	for {
+		cmd, err := line.Prompt("> ")
+		if err != nil {
+			fmt.Printf("%v\n", err)
+			return
+		}
+
+		cmds := reg.FindAllString(cmd, -1)
+		if len(cmds) == 0 {
+			continue
+		} else {
+			line.AppendHistory(cmd)
+
+			args := make([]string, len(cmds[1:]))
+
+			for i := range args {
+				args[i] = strings.Trim(string(cmds[1+i]), "\"'")
+			}
+
+			cmd := strings.ToLower(cmds[0])
+			if cmd == "help" || cmd == "?" {
+				printHelp(cmds)
+			} else if cmd == "exit" || cmd == "quit" {
+				return
+			} else {
+				for _, c := range commands {
+					if c.Name() == cmd {
+						if err := c.Do(args, commandEnv, os.Stderr); err != nil {
+							fmt.Fprintf(os.Stderr, "error: %v\n", err)
+						}
+					}
+				}
+			}
+
+		}
+	}
+}
+
+func printGenericHelp() {
+	msg :=
+		`Type:	"help <command>" for help on <command>
+`
+	fmt.Print(msg)
+
+	sort.Slice(commands, func(i, j int) bool {
+		return strings.Compare(commands[i].Name(), commands[j].Name()) < 0
+	})
+	for _, c := range commands {
+		fmt.Printf("\t%s %s \n", c.Name(), c.Help())
+	}
+}
+
+func printHelp(cmds []string) {
+	args := cmds[1:]
+	if len(args) == 0 {
+		printGenericHelp()
+	} else if len(args) > 1 {
+		fmt.Println()
+	} else {
+		cmd := strings.ToLower(args[0])
+
+		sort.Slice(commands, func(i, j int) bool {
+			return strings.Compare(commands[i].Name(), commands[j].Name()) < 0
+		})
+
+		for _, c := range commands {
+			if c.Name() == cmd {
+				fmt.Println()
+				fmt.Printf("\t%s %s \n", c.Name(), c.Help())
+				fmt.Println()
+			}
+		}
+	}
+}
+
+func setCompletionHandler() {
+	line.SetCompleter(func(line string) (c []string) {
+		for _, i := range commands {
+			if strings.HasPrefix(i.Name(), strings.ToLower(line)) {
+				c = append(c, i.Name())
+			}
+		}
+		return
+	})
+}
+
+func loadHisotry() {
+	if f, err := os.Open(historyPath); err == nil {
+		line.ReadHistory(f)
+		f.Close()
+	}
+}
+
+func saveHisotry() {
+	if f, err := os.Create(historyPath); err != nil {
+		fmt.Printf("Error writing history file: %v\n", err)
+	} else {
+		line.WriteHistory(f)
+		f.Close()
+	}
+}