Golang goopt.Help函數代碼示例

func main() {
	goopt.Suite = "XQZ coreutils"
	goopt.Author = "Aaron Muir Hamilton"
	goopt.Version = "Sleep v0.1"
	goopt.Summary = "Waits for a duration before continuing."
	goopt.Usage = func() string {
		return fmt.Sprintf("Usage of %s:\n\t   %s STRING\n\tor %s OPTION\n", os.Args[0], os.Args[0], os.Args[0]) +
			goopt.Summary + "\n\n" + goopt.Help()
	}
	goopt.Description = func() string {
		return goopt.Summary + "\n\nUnless an option is passed to it."
	}
	goopt.NoArg([]string{"-v", "--version"}, "outputs version information and exits", version)
	goopt.Parse(nil)
	duration, err := time.ParseDuration(os.Args[1])
	if err != nil {
		number, interr := strconv.ParseFloat(os.Args[1], 64)
		if interr != nil {
			fmt.Println(err)
			os.Exit(0)
		}
		duration := time.Duration(number) * time.Second
		time.Sleep(duration)
		os.Exit(0)
	}
	time.Sleep(duration)
}

func usage() string {
	u := `Usage: %s [-h HOST] [-p PORT]
       %s [-v VENDOR -s STATUS -c COLOR] <FILENAME>

%s`
	return fmt.Sprintf(u, os.Args[0], os.Args[0], goopt.Help())
}

func main() {
	atime = time.Now()
	mtime = time.Now()
	goopt.Author = "William Pearson"
	goopt.Version = "Touch"
	goopt.Summary = "Change access or modification time of each FILE"
	goopt.Usage = func() string {
		return fmt.Sprintf("Usage:\t%s [OPTION]... FILE...\n", os.Args[0]) +
			goopt.Summary + "\n\n" + goopt.Help()
	}
	goopt.Description = func() string {
		return goopt.Summary + "\n\nUnless --help or --version is passed."
	}
	access := goopt.Flag([]string{"-a"}, nil, "Only change access time", "")
	modify := goopt.Flag([]string{"-m"}, nil, "Only change modification time", "")
	create := goopt.Flag([]string{"-c"}, nil, "Only change modification time", "")
	Nodereference = goopt.Flag([]string{"-h", "--no-dereference"}, []string{"--derference"}, "Affect symbolic links directly instead of dereferencing them", "Dereference symbolic links before operating on them (This is default)")
	goopt.OptArg([]string{"-r", "--reference"}, "RFILE", "Use RFILE's owner and group", fromReference)
	goopt.OptArg([]string{"-t"}, "STAMP", "Use [[CC]YY]MMDDhhmm[.ss] instead of now. Note hh is interpreted as from 00 to 23", fromStamp)
	goopt.NoArg([]string{"--version"}, "outputs version information and exits", coreutils.Version)
	goopt.Parse(nil)
	coreutils.Noderef = *Nodereference
	if len(goopt.Args) == 0 {
		coreutils.PrintUsage()
	}
	if !*access && !*modify {
		*access, *modify = true, true
	}
	for i := range goopt.Args {
		if !*access {
			atime, _ = GetAtimeMtime(goopt.Args[i], *Nodereference)
		}
		if !*modify {
			_, mtime = GetAtimeMtime(goopt.Args[i], *Nodereference)
		}
		if err := os.Chtimes(goopt.Args[i], atime, mtime); err != nil {
			if os.IsNotExist(err) {
				var err error
				if !*create {
					f, err := os.Create(goopt.Args[i])
					if err == nil {
						f.Close()
					}
				}
				if err == nil {
					continue
				}
			}
			fmt.Fprintf(os.Stderr, "Error touching file '%s': %v\n", goopt.Args[i], err)
		}
	}
	return
}

func main() {
	goopt.Author = Author
	goopt.Version = Version
	goopt.Summary = Summary
	goopt.Usage = func() string {
		return fmt.Sprintf("Usage of goreplace %s:\n\t", Version) +
			goopt.Summary + "\n" + goopt.Help()
	}

	var noIgnores bool
	for _, item := range os.Args[1:] {
		if item == "-I" || item == "--no-autoignore" {
			noIgnores = true
		}
	}

	cwd, _ := os.Getwd()
	ignorer := NewIgnorer(cwd, noIgnores)
	goopt.Summary += fmt.Sprintf("\n%s", ignorer)

	goopt.Parse(nil)


	if *showVersion {
		fmt.Printf("goreplace %s\n", goopt.Version)
		return
	}

	ignorer.Append(*ignoreFiles)

	if len(goopt.Args) == 0 {
		println(goopt.Usage())
		return
	}

	arg := goopt.Args[0]
	if *plaintext {
		arg = escapeRegex(arg)
	}
	if *ignoreCase {
		arg = "(?i:" + arg + ")"
	}

	pattern, err := regexp.Compile(arg)
	errhandle(err, true, "")

	if pattern.Match([]byte("")) {
		errhandle(errors.New("Your pattern matches empty string"), true, "")
	}

	searchFiles(pattern, ignorer)
}

func main() {
	goopt.Suite = "DevTodo2"
	goopt.Version = "2.1"
	goopt.Author = "Alec Thomas <[email protected]>"
	goopt.Description = func() string {
		return `DevTodo is a program aimed specifically at programmers (but usable by anybody
at the terminal) to aid in day-to-day development.

It maintains a list of items that have yet to be completed, one list for each
project directory. This allows the programmer to track outstanding bugs or
items that need to be completed with very little effort.

Items can be prioritised and are displayed in a hierarchy, so that one item may
depend on another.


todo2 [-A]
  Display (all) tasks.

todo2 [-p <priority>] -a <text>
  Create a new task.

todo2 -d <index>
  Mark a task as complete.

todo2 [-p <priority>] -e <task> [<text>]
  Edit an existing task.`
	}
	goopt.Summary = "DevTodo2 - a hierarchical command-line task manager"
	goopt.Usage = func() string {
		return fmt.Sprintf("usage: %s [<options>] ...\n\n%s\n\n%s",
			os.Args[0], goopt.Summary, goopt.Help())
	}
	goopt.Parse(nil)

	tasks, err := loadTaskList()
	if err != nil {
		fatal("%s", err)
	}
	if tasks == nil {
		tasks = NewTaskList()
	}
	processAction(tasks)
}

func main() {
	goopt.Version = version
	goopt.Summary = "send emc vnx performance data to graphite"
	goopt.Parse(nil)

	if f, _ := exists(*opt_conf); f == false {
		fmt.Print(goopt.Help())
		fmt.Println("ERROR: config file " + *opt_conf + " doesn't exist")
		return
	}
	c, _ := config.ReadDefault(*opt_conf)

	host, _ := c.String("graphite", "host")
	port, _ := c.Int("graphite", "port")
	timeout, _ := c.Int("graphite", "timeout")
	basename, _ := c.String("graphite", "basename")
	//todo: we also can parse this from the output...
	timestamp := time.Now().Unix()

	log(fmt.Sprintf("using graphite with host %s:%d", host, port))

	if f, _ := exists(*opt_data); f == false {
		fmt.Print(goopt.Help())
		fmt.Println("ERROR: data file " + *opt_data + " doesn't exist")
		return
	}
	lines, err := readLines(*opt_data)
	if err != nil {
		fmt.Println("ERROR:", err)
		return
	}
	//we only want to use the head and the first line of data
	head := strings.Split(lines[0], ",")
	data := strings.Split(lines[1], ",")

	if len(head) != len(data) {
		fmt.Println("ERROR: malformed csv (length of head != length of data")
		return
	}

	//create the graphite connection.
	// Todo: export this in a small pkg

	cstr := fmt.Sprintf("%s:%d", host, port)
	log("trying to connect to " + cstr)
	conn, err := net.DialTimeout("tcp", cstr, time.Duration(timeout)*time.Second)

	if err != nil {
		fmt.Println("ERROR:", err)
		return
	}

	for n, val := range head {
		key := stringify(val)
		value := stringify(data[n])
		if key != "Timestamp" {
			msg := fmt.Sprintf("%s.%s.%s.%s %s %d", basename, *opt_mover, *opt_statsname, key, value, timestamp)
			log("sending: " + msg)
			fmt.Fprint(conn, "\n"+msg+"\n")
		} else {
			log("Timestamp: ... next...")
		}
	}
	conn.Close()
}

func optFail(message string) {
	fmt.Println(message)
	fmt.Print(goopt.Help())
	os.Exit(1)
}

func main() {
	goopt.Suite = "XQZ coreutils"
	goopt.Author = "William Pearson"
	goopt.Version = "Unlink v0.1"
	goopt.Summary = "Uses unlink to remove FILE"
	goopt.Usage = func() string {
		return fmt.Sprintf("Usage:\t%s FILE\n or:\t%s OPTION\n", os.Args[0], os.Args[0]) + goopt.Summary + "\n\n" + goopt.Help()
	}
	goopt.Description = func() string {
		return goopt.Summary + "\n\nUnless an option is passed to it."
	}
	goopt.NoArg([]string{"-v", "--version"}, "outputs version information and exits", version)
	goopt.Parse(nil)
	switch {
	case len(os.Args) == 1:
		fmt.Println("Missing filenames")
	case len(os.Args) > 2:
		fmt.Println("Too many filenames")
	}
	if len(os.Args) != 2 {
		os.Exit(1)
	}
	file := os.Args[1]
	if err := syscall.Unlink(file); err != nil {
		fmt.Println("Encountered an error during unlinking: %v", err)
		os.Exit(1)
	}
	return
}

func main() {
	goopt.Suite = "XQZ coreutils"
	goopt.Author = "William Pearson"
	goopt.Version = "Link v0.1"
	goopt.Summary = "Creates a link to FILE1 called FILE2"
	goopt.Usage = func() string {
		return fmt.Sprintf("Usage:\t%s FILE1 FILE2\n or:\t%s OPTION\n", os.Args[0], os.Args[0]) + goopt.Summary + "\n\n" + goopt.Help()
	}
	goopt.Description = func() string {
		return goopt.Summary + "\n\nUnless an option is passed to it."
	}
	goopt.NoArg([]string{"-v", "--version"}, "outputs version information and exits", version)
	goopt.Parse(nil)
	switch {
	case len(os.Args) == 1:
		fmt.Println("Missing filenames")
	case len(os.Args) == 2:
		fmt.Println("Missing filename after '%s'", os.Args[1])
	case len(os.Args) > 3:
		fmt.Println("Too many filenames")
	}
	if len(os.Args) != 3 {
		os.Exit(1)
	}
	file1 := os.Args[1]
	file2 := os.Args[2]
	if err := os.Link(file1, file2); err != nil {
		fmt.Println("Encountered an error during linking: %v", err)
		os.Exit(1)
	}
	return
}

func main() {
	flag.Parse(nil)

	address_list := flag.Args
	if len(address_list) == 0 {
		fmt.Println("No Addresses submitted")
		fmt.Println(flag.Help())
		return
	}

	var send, recv bool
	skip := false

	var socket *zmq.Socket
	switch *socket_type {
	case "PUSH":
		socket, _ = zmq.NewSocket(zmq.PUSH)
		send = true
	case "PULL":
		socket, _ = zmq.NewSocket(zmq.PULL)
		recv = true
	case "PUB":
		socket, _ = zmq.NewSocket(zmq.PUB)
		send = true
	case "SUB":
		socket, _ = zmq.NewSocket(zmq.SUB)
		recv = true
		if len(*subscriptions) == 0 {
			socket.SetSubscribe("")
		}
		for _, subscription := range *subscriptions {
			socket.SetSubscribe(subscription)
		}
	case "REQ":
		socket, _ = zmq.NewSocket(zmq.REQ)
		send = true
		recv = true
	case "REP":
		socket, _ = zmq.NewSocket(zmq.REP)
		send = true
		recv = true
		skip = true
	}
	defer socket.Close()

	// connect or bind
	if *mode {
		for _, address := range address_list {
			socket.Connect(address)
		}
	} else {
		for _, address := range address_list {
			socket.Bind(address)
		}
	}

	delim := byte('\n')
	if *null {
		fmt.Println("Setting delim to null")
		delim = byte(0x00)
	}

	reader := bufio.NewReader(os.Stdin)
	writer := bufio.NewWriter(os.Stdout)

	for i := 0; i < *number || *number == -1; i++ {
		if send && !skip {
			line, _ := reader.ReadBytes(delim)
			socket.SendBytes([]byte(line), 0)
		}
		if recv {
			data, _ := socket.RecvBytes(0)
			writer.Write(data)
			writer.Flush()
		}
		if skip {
			skip = false
		}
	}

	fmt.Println("finished", *number)
}