Golang cli.NewApp函数代码示例

func Example() {
	app := cli.NewApp()
	app.Name = "todo"
	app.Usage = "task list on the command line"
	app.Commands = []cli.Command{
		{
			Name:    "add",
			Aliases: []string{"a"},
			Usage:   "add a task to the list",
			Action: func(c *cli.Context) {
				println("added task: ", c.Args().First())
			},
		},
		{
			Name:    "complete",
			Aliases: []string{"c"},
			Usage:   "complete a task on the list",
			Action: func(c *cli.Context) {
				println("completed task: ", c.Args().First())
			},
		},
	}

	app.Run(os.Args)
}

func ExampleAppBashComplete() {
	// set args for examples sake
	os.Args = []string{"greet", "--generate-bash-completion"}

	app := cli.NewApp()
	app.Name = "greet"
	app.EnableBashCompletion = true
	app.Commands = []cli.Command{
		{
			Name:        "describeit",
			Aliases:     []string{"d"},
			Usage:       "use it to see a description",
			Description: "This is how we describe describeit the function",
			Action: func(c *cli.Context) {
				fmt.Printf("i like to describe things")
			},
		}, {
			Name:        "next",
			Usage:       "next example",
			Description: "more stuff to see when generating bash completion",
			Action: func(c *cli.Context) {
				fmt.Printf("the next example")
			},
		},
	}

	app.Run(os.Args)
	// Output:
	// describeit
	// d
	// next
	// help
	// h
}

func TestApp_DefaultStdout(t *testing.T) {
	app := cli.NewApp()

	if app.Writer != os.Stdout {
		t.Error("Default output writer not set.")
	}
}

func TestApp_Run_Version(t *testing.T) {
	var versionArguments = [][]string{{"boom", "--version"}, {"boom", "-v"}}

	for _, args := range versionArguments {
		buf := new(bytes.Buffer)

		t.Logf("==> checking with arguments %v", args)

		app := cli.NewApp()
		app.Name = "boom"
		app.Usage = "make an explosive entrance"
		app.Version = "0.1.0"
		app.Writer = buf
		app.Action = func(c *cli.Context) {
			buf.WriteString("boom I say!")
		}

		err := app.Run(args)
		if err != nil {
			t.Error(err)
		}

		output := buf.String()
		t.Logf("output: %q\n", buf.Bytes())

		if !strings.Contains(output, "0.1.0") {
			t.Errorf("want version to contain %q, did not: \n%q", "0.1.0", output)
		}
	}
}

func ExampleAppHelp() {
	// set args for examples sake
	os.Args = []string{"greet", "h", "describeit"}

	app := cli.NewApp()
	app.Name = "greet"
	app.Flags = []cli.Flag{
		cli.StringFlag{Name: "name", Value: "bob", Usage: "a name to say"},
	}
	app.Commands = []cli.Command{
		{
			Name:        "describeit",
			Aliases:     []string{"d"},
			Usage:       "use it to see a description",
			Description: "This is how we describe describeit the function",
			Action: func(c *cli.Context) {
				fmt.Printf("i like to describe things")
			},
		},
	}
	app.Run(os.Args)
	// Output:
	// NAME:
	//    describeit - use it to see a description
	//
	// USAGE:
	//    command describeit [arguments...]
	//
	// DESCRIPTION:
	//    This is how we describe describeit the function
}

func TestApp_ParseSliceFlagsWithMissingValue(t *testing.T) {
	var parsedIntSlice []int
	var parsedStringSlice []string

	app := cli.NewApp()
	command := cli.Command{
		Name: "cmd",
		Flags: []cli.Flag{
			cli.IntSliceFlag{Name: "a", Usage: "set numbers"},
			cli.StringSliceFlag{Name: "str", Usage: "set strings"},
		},
		Action: func(c *cli.Context) {
			parsedIntSlice = c.IntSlice("a")
			parsedStringSlice = c.StringSlice("str")
		},
	}
	app.Commands = []cli.Command{command}

	app.Run([]string{"", "cmd", "my-arg", "-a", "2", "-str", "A"})

	var expectedIntSlice = []int{2}
	var expectedStringSlice = []string{"A"}

	if parsedIntSlice[0] != expectedIntSlice[0] {
		t.Errorf("%v does not match %v", parsedIntSlice[0], expectedIntSlice[0])
	}

	if parsedStringSlice[0] != expectedStringSlice[0] {
		t.Errorf("%v does not match %v", parsedIntSlice[0], expectedIntSlice[0])
	}
}

func TestApp_RunAsSubcommandParseFlags(t *testing.T) {
	var context *cli.Context

	a := cli.NewApp()
	a.Commands = []cli.Command{
		{
			Name: "foo",
			Action: func(c *cli.Context) {
				context = c
			},
			Flags: []cli.Flag{
				cli.StringFlag{
					Name:  "lang",
					Value: "english",
					Usage: "language for the greeting",
				},
			},
			Before: func(_ *cli.Context) error { return nil },
		},
	}
	a.Run([]string{"", "foo", "--lang", "spanish", "abcd"})

	expect(t, context.Args().Get(0), "abcd")
	expect(t, context.String("lang"), "spanish")
}

func TestApp_Run_SubcommandFullPath(t *testing.T) {
	app := cli.NewApp()
	buf := new(bytes.Buffer)
	app.Writer = buf

	subCmd := cli.Command{
		Name:  "bar",
		Usage: "does bar things",
	}
	cmd := cli.Command{
		Name:        "foo",
		Description: "foo commands",
		Subcommands: []cli.Command{subCmd},
	}
	app.Commands = []cli.Command{cmd}

	err := app.Run([]string{"command", "foo", "bar", "--help"})
	if err != nil {
		t.Error(err)
	}

	output := buf.String()
	if !strings.Contains(output, "foo bar - does bar things") {
		t.Errorf("expected full path to subcommand: %s", output)
	}
	if !strings.Contains(output, "command foo bar [arguments...]") {
		t.Errorf("expected full path to subcommand: %s", output)
	}
}

func TestApp_ParseSliceFlags(t *testing.T) {
	var parsedOption, firstArg string
	var parsedIntSlice []int
	var parsedStringSlice []string

	app := cli.NewApp()
	command := cli.Command{
		Name: "cmd",
		Flags: []cli.Flag{
			cli.IntSliceFlag{Name: "p", Value: &cli.IntSlice{}, Usage: "set one or more ip addr"},
			cli.StringSliceFlag{Name: "ip", Value: &cli.StringSlice{}, Usage: "set one or more ports to open"},
		},
		Action: func(c *cli.Context) {
			parsedIntSlice = c.IntSlice("p")
			parsedStringSlice = c.StringSlice("ip")
			parsedOption = c.String("option")
			firstArg = c.Args().First()
		},
	}
	app.Commands = []cli.Command{command}

	app.Run([]string{"", "cmd", "my-arg", "-p", "22", "-p", "80", "-ip", "8.8.8.8", "-ip", "8.8.4.4"})

	IntsEquals := func(a, b []int) bool {
		if len(a) != len(b) {
			return false
		}
		for i, v := range a {
			if v != b[i] {
				return false
			}
		}
		return true
	}

	StrsEquals := func(a, b []string) bool {
		if len(a) != len(b) {
			return false
		}
		for i, v := range a {
			if v != b[i] {
				return false
			}
		}
		return true
	}
	var expectedIntSlice = []int{22, 80}
	var expectedStringSlice = []string{"8.8.8.8", "8.8.4.4"}

	if !IntsEquals(parsedIntSlice, expectedIntSlice) {
		t.Errorf("%v does not match %v", parsedIntSlice, expectedIntSlice)
	}

	if !StrsEquals(parsedStringSlice, expectedStringSlice) {
		t.Errorf("%v does not match %v", parsedStringSlice, expectedStringSlice)
	}
}

func TestApp_Run_CommandWithSubcommandHasHelpTopic(t *testing.T) {
	var subcommandHelpTopics = [][]string{
		{"command", "foo", "--help"},
		{"command", "foo", "-h"},
		{"command", "foo", "help"},
	}

	for _, flagSet := range subcommandHelpTopics {
		t.Logf("==> checking with flags %v", flagSet)

		app := cli.NewApp()
		buf := new(bytes.Buffer)
		app.Writer = buf

		subCmdBar := cli.Command{
			Name:  "bar",
			Usage: "does bar things",
		}
		subCmdBaz := cli.Command{
			Name:  "baz",
			Usage: "does baz things",
		}
		cmd := cli.Command{
			Name:        "foo",
			Description: "descriptive wall of text about how it does foo things",
			Subcommands: []cli.Command{subCmdBar, subCmdBaz},
		}

		app.Commands = []cli.Command{cmd}
		err := app.Run(flagSet)

		if err != nil {
			t.Error(err)
		}

		output := buf.String()
		t.Logf("output: %q\n", buf.Bytes())

		if strings.Contains(output, "No help topic for") {
			t.Errorf("expect a help topic, got none: \n%q", output)
		}

		for _, shouldContain := range []string{
			cmd.Name, cmd.Description,
			subCmdBar.Name, subCmdBar.Usage,
			subCmdBaz.Name, subCmdBaz.Usage,
		} {
			if !strings.Contains(output, shouldContain) {
				t.Errorf("want help to contain %q, did not: \n%q", shouldContain, output)
			}
		}
	}
}

func TestApp_Command(t *testing.T) {
	app := cli.NewApp()
	fooCommand := cli.Command{Name: "foobar", Aliases: []string{"f"}}
	batCommand := cli.Command{Name: "batbaz", Aliases: []string{"b"}}
	app.Commands = []cli.Command{
		fooCommand,
		batCommand,
	}

	for _, test := range commandAppTests {
		expect(t, app.Command(test.name) != nil, test.expected)
	}
}

func Test_ShowAppHelp_NoAuthor(t *testing.T) {
	output := new(bytes.Buffer)
	app := cli.NewApp()
	app.Writer = output

	c := cli.NewContext(app, nil, nil)

	cli.ShowAppHelp(c)

	if bytes.Index(output.Bytes(), []byte("AUTHOR(S):")) != -1 {
		t.Errorf("expected\n%snot to include %s", output.String(), "AUTHOR(S):")
	}
}

func TestApp_Run(t *testing.T) {
	s := ""

	app := cli.NewApp()
	app.Action = func(c *cli.Context) {
		s = s + c.Args().First()
	}

	err := app.Run([]string{"command", "foo"})
	expect(t, err, nil)
	err = app.Run([]string{"command", "bar"})
	expect(t, err, nil)
	expect(t, s, "foobar")
}

func TestApp_Float64Flag(t *testing.T) {
	var meters float64

	app := cli.NewApp()
	app.Flags = []cli.Flag{
		cli.Float64Flag{Name: "height", Value: 1.5, Usage: "Set the height, in meters"},
	}
	app.Action = func(c *cli.Context) {
		meters = c.Float64("height")
	}

	app.Run([]string{"", "--height", "1.93"})
	expect(t, meters, 1.93)
}

func TestAppNoHelpFlag(t *testing.T) {
	oldFlag := cli.HelpFlag
	defer func() {
		cli.HelpFlag = oldFlag
	}()

	cli.HelpFlag = cli.BoolFlag{}

	app := cli.NewApp()
	err := app.Run([]string{"test", "-h"})

	if err != flag.ErrHelp {
		t.Errorf("expected error about missing help flag, but got: %s (%T)", err, err)
	}
}