package shell import ( "fmt" "io" "os" "path" "regexp" "sort" "strings" "github.com/peterh/liner" ) var ( line *liner.State historyPath = path.Join(os.TempDir(), "weed-shell") ) func RunShell(options ShellOptions) { sort.Slice(Commands, func(i, j int) bool { return strings.Compare(Commands[i].Name(), Commands[j].Name()) < 0 }) line = liner.NewLiner() defer line.Close() line.SetCtrlCAborts(true) setCompletionHandler() loadHistory() defer saveHistory() reg, _ := regexp.Compile(`'.*?'|".*?"|\S+`) commandEnv := NewCommandEnv(options) go commandEnv.MasterClient.KeepConnectedToMaster() commandEnv.MasterClient.WaitUntilConnected() for { cmd, err := line.Prompt("> ") if err != nil { if err != io.EOF { fmt.Printf("%v\n", err) } return } for _, c := range strings.Split(cmd, ";") { if processEachCmd(reg, c, commandEnv) { return } } } } func processEachCmd(reg *regexp.Regexp, cmd string, commandEnv *CommandEnv) bool { cmds := reg.FindAllString(cmd, -1) if len(cmds) == 0 { return false } else { line.AppendHistory(cmd) args := make([]string, len(cmds[1:])) for i := range args { args[i] = strings.Trim(string(cmds[1+i]), "\"'") } cmd := cmds[0] if cmd == "help" || cmd == "?" { printHelp(cmds) } else if cmd == "exit" || cmd == "quit" { return true } else { foundCommand := false for _, c := range Commands { if c.Name() == cmd || c.Name() == "fs."+cmd { if err := c.Do(args, commandEnv, os.Stdout); err != nil { fmt.Fprintf(os.Stderr, "error: %v\n", err) } foundCommand = true } } if !foundCommand { fmt.Fprintf(os.Stderr, "unknown command: %v\n", cmd) } } } return false } func printGenericHelp() { msg := `Type: "help " for help on . Most commands support " -h" also for options. ` fmt.Print(msg) for _, c := range Commands { helpTexts := strings.SplitN(c.Help(), "\n", 2) fmt.Printf(" %-30s\t# %s \n", c.Name(), helpTexts[0]) } } 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]) for _, c := range Commands { if c.Name() == cmd { fmt.Printf(" %s\t# %s\n", c.Name(), c.Help()) } } } } 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 loadHistory() { if f, err := os.Open(historyPath); err == nil { line.ReadHistory(f) f.Close() } } func saveHistory() { if f, err := os.Create(historyPath); err != nil { fmt.Printf("Error writing history file: %v\n", err) } else { line.WriteHistory(f) f.Close() } }