package cli import ( "bytes" "flag" "fmt" "io" "os" "strings" "testing" ) func ExampleApp() { // set args for examples sake os.Args = []string{"greet", "--name", "Jeremy"} app := NewApp() app.Name = "greet" app.Flags = []Flag{ StringFlag{Name: "name", Value: "bob", Usage: "a name to say"}, } app.Action = func(c *Context) { fmt.Printf("Hello %v\n", c.String("name")) } app.Author = "Harrison" app.Email = "harrison@lolwut.com" app.Authors = []Author{Author{Name: "Oliver Allen", Email: "oliver@toyshop.com"}} app.Run(os.Args) // Output: // Hello Jeremy } func ExampleAppSubcommand() { // set args for examples sake os.Args = []string{"say", "hi", "english", "--name", "Jeremy"} app := NewApp() app.Name = "say" app.Commands = []Command{ { Name: "hello", Aliases: []string{"hi"}, Usage: "use it to see a description", Description: "This is how we describe hello the function", Subcommands: []Command{ { Name: "english", Aliases: []string{"en"}, Usage: "sends a greeting in english", Description: "greets someone in english", Flags: []Flag{ StringFlag{ Name: "name", Value: "Bob", Usage: "Name of the person to greet", }, }, Action: func(c *Context) { fmt.Println("Hello,", c.String("name")) }, }, }, }, } app.Run(os.Args) // Output: // Hello, Jeremy } func ExampleAppHelp() { // set args for examples sake os.Args = []string{"greet", "h", "describeit"} app := NewApp() app.Name = "greet" app.Flags = []Flag{ StringFlag{Name: "name", Value: "bob", Usage: "a name to say"}, } app.Commands = []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 *Context) { fmt.Printf("i like to describe things") }, }, } app.Run(os.Args) // Output: // NAME: // greet describeit - use it to see a description // // USAGE: // greet describeit [arguments...] // // DESCRIPTION: // This is how we describe describeit the function } func ExampleAppBashComplete() { // set args for examples sake os.Args = []string{"greet", "--generate-bash-completion"} app := NewApp() app.Name = "greet" app.EnableBashCompletion = true app.Commands = []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 *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 *Context) { fmt.Printf("the next example") }, }, } app.Run(os.Args) // Output: // describeit // d // next // help // h } func TestApp_Run(t *testing.T) { s := "" app := NewApp() app.Action = func(c *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") } var commandAppTests = []struct { name string expected bool }{ {"foobar", true}, {"batbaz", true}, {"b", true}, {"f", true}, {"bat", false}, {"nothing", false}, } func TestApp_Command(t *testing.T) { app := NewApp() fooCommand := Command{Name: "foobar", Aliases: []string{"f"}} batCommand := Command{Name: "batbaz", Aliases: []string{"b"}} app.Commands = []Command{ fooCommand, batCommand, } for _, test := range commandAppTests { expect(t, app.Command(test.name) != nil, test.expected) } } func TestApp_CommandWithArgBeforeFlags(t *testing.T) { var parsedOption, firstArg string app := NewApp() command := Command{ Name: "cmd", Flags: []Flag{ StringFlag{Name: "option", Value: "", Usage: "some option"}, }, Action: func(c *Context) { parsedOption = c.String("option") firstArg = c.Args().First() }, } app.Commands = []Command{command} app.Run([]string{"", "cmd", "my-arg", "--option", "my-option"}) expect(t, parsedOption, "my-option") expect(t, firstArg, "my-arg") } func TestApp_RunAsSubcommandParseFlags(t *testing.T) { var context *Context a := NewApp() a.Commands = []Command{ { Name: "foo", Action: func(c *Context) { context = c }, Flags: []Flag{ StringFlag{ Name: "lang", Value: "english", Usage: "language for the greeting", }, }, Before: func(_ *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_CommandWithFlagBeforeTerminator(t *testing.T) { var parsedOption string var args []string app := NewApp() command := Command{ Name: "cmd", Flags: []Flag{ StringFlag{Name: "option", Value: "", Usage: "some option"}, }, Action: func(c *Context) { parsedOption = c.String("option") args = c.Args() }, } app.Commands = []Command{command} app.Run([]string{"", "cmd", "my-arg", "--option", "my-option", "--", "--notARealFlag"}) expect(t, parsedOption, "my-option") expect(t, args[0], "my-arg") expect(t, args[1], "--") expect(t, args[2], "--notARealFlag") } func TestApp_CommandWithNoFlagBeforeTerminator(t *testing.T) { var args []string app := NewApp() command := Command{ Name: "cmd", Action: func(c *Context) { args = c.Args() }, } app.Commands = []Command{command} app.Run([]string{"", "cmd", "my-arg", "--", "notAFlagAtAll"}) expect(t, args[0], "my-arg") expect(t, args[1], "--") expect(t, args[2], "notAFlagAtAll") } func TestApp_Float64Flag(t *testing.T) { var meters float64 app := NewApp() app.Flags = []Flag{ Float64Flag{Name: "height", Value: 1.5, Usage: "Set the height, in meters"}, } app.Action = func(c *Context) { meters = c.Float64("height") } app.Run([]string{"", "--height", "1.93"}) expect(t, meters, 1.93) } func TestApp_ParseSliceFlags(t *testing.T) { var parsedOption, firstArg string var parsedIntSlice []int var parsedStringSlice []string app := NewApp() command := Command{ Name: "cmd", Flags: []Flag{ IntSliceFlag{Name: "p", Value: &IntSlice{}, Usage: "set one or more ip addr"}, StringSliceFlag{Name: "ip", Value: &StringSlice{}, Usage: "set one or more ports to open"}, }, Action: func(c *Context) { parsedIntSlice = c.IntSlice("p") parsedStringSlice = c.StringSlice("ip") parsedOption = c.String("option") firstArg = c.Args().First() }, } app.Commands = []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_ParseSliceFlagsWithMissingValue(t *testing.T) { var parsedIntSlice []int var parsedStringSlice []string app := NewApp() command := Command{ Name: "cmd", Flags: []Flag{ IntSliceFlag{Name: "a", Usage: "set numbers"}, StringSliceFlag{Name: "str", Usage: "set strings"}, }, Action: func(c *Context) { parsedIntSlice = c.IntSlice("a") parsedStringSlice = c.StringSlice("str") }, } app.Commands = []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_DefaultStdout(t *testing.T) { app := NewApp() if app.Writer != os.Stdout { t.Error("Default output writer not set.") } } type mockWriter struct { written []byte } func (fw *mockWriter) Write(p []byte) (n int, err error) { if fw.written == nil { fw.written = p } else { fw.written = append(fw.written, p...) } return len(p), nil } func (fw *mockWriter) GetWritten() (b []byte) { return fw.written } func TestApp_SetStdout(t *testing.T) { w := &mockWriter{} app := NewApp() app.Name = "test" app.Writer = w err := app.Run([]string{"help"}) if err != nil { t.Fatalf("Run error: %s", err) } if len(w.written) == 0 { t.Error("App did not write output to desired writer.") } } func TestApp_BeforeFunc(t *testing.T) { beforeRun, subcommandRun := false, false beforeError := fmt.Errorf("fail") var err error app := NewApp() app.Before = func(c *Context) error { beforeRun = true s := c.String("opt") if s == "fail" { return beforeError } return nil } app.Commands = []Command{ Command{ Name: "sub", Action: func(c *Context) { subcommandRun = true }, }, } app.Flags = []Flag{ StringFlag{Name: "opt"}, } // run with the Before() func succeeding err = app.Run([]string{"command", "--opt", "succeed", "sub"}) if err != nil { t.Fatalf("Run error: %s", err) } if beforeRun == false { t.Errorf("Before() not executed when expected") } if subcommandRun == false { t.Errorf("Subcommand not executed when expected") } // reset beforeRun, subcommandRun = false, false // run with the Before() func failing err = app.Run([]string{"command", "--opt", "fail", "sub"}) // should be the same error produced by the Before func if err != beforeError { t.Errorf("Run error expected, but not received") } if beforeRun == false { t.Errorf("Before() not executed when expected") } if subcommandRun == true { t.Errorf("Subcommand executed when NOT expected") } } func TestApp_AfterFunc(t *testing.T) { afterRun, subcommandRun := false, false afterError := fmt.Errorf("fail") var err error app := NewApp() app.After = func(c *Context) error { afterRun = true s := c.String("opt") if s == "fail" { return afterError } return nil } app.Commands = []Command{ Command{ Name: "sub", Action: func(c *Context) { subcommandRun = true }, }, } app.Flags = []Flag{ StringFlag{Name: "opt"}, } // run with the After() func succeeding err = app.Run([]string{"command", "--opt", "succeed", "sub"}) if err != nil { t.Fatalf("Run error: %s", err) } if afterRun == false { t.Errorf("After() not executed when expected") } if subcommandRun == false { t.Errorf("Subcommand not executed when expected") } // reset afterRun, subcommandRun = false, false // run with the Before() func failing err = app.Run([]string{"command", "--opt", "fail", "sub"}) // should be the same error produced by the Before func if err != afterError { t.Errorf("Run error expected, but not received") } if afterRun == false { t.Errorf("After() not executed when expected") } if subcommandRun == false { t.Errorf("Subcommand not executed when expected") } } func TestAppNoHelpFlag(t *testing.T) { oldFlag := HelpFlag defer func() { HelpFlag = oldFlag }() HelpFlag = BoolFlag{} app := 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) } } func TestAppHelpPrinter(t *testing.T) { oldPrinter := HelpPrinter defer func() { HelpPrinter = oldPrinter }() var wasCalled = false HelpPrinter = func(w io.Writer, template string, data interface{}) { wasCalled = true } app := NewApp() app.Run([]string{"-h"}) if wasCalled == false { t.Errorf("Help printer expected to be called, but was not") } } func TestAppVersionPrinter(t *testing.T) { oldPrinter := VersionPrinter defer func() { VersionPrinter = oldPrinter }() var wasCalled = false VersionPrinter = func(c *Context) { wasCalled = true } app := NewApp() ctx := NewContext(app, nil, nil) ShowVersion(ctx) if wasCalled == false { t.Errorf("Version printer expected to be called, but was not") } } func TestAppCommandNotFound(t *testing.T) { beforeRun, subcommandRun := false, false app := NewApp() app.CommandNotFound = func(c *Context, command string) { beforeRun = true } app.Commands = []Command{ Command{ Name: "bar", Action: func(c *Context) { subcommandRun = true }, }, } app.Run([]string{"command", "foo"}) expect(t, beforeRun, true) expect(t, subcommandRun, false) } func TestGlobalFlag(t *testing.T) { var globalFlag string var globalFlagSet bool app := NewApp() app.Flags = []Flag{ StringFlag{Name: "global, g", Usage: "global"}, } app.Action = func(c *Context) { globalFlag = c.GlobalString("global") globalFlagSet = c.GlobalIsSet("global") } app.Run([]string{"command", "-g", "foo"}) expect(t, globalFlag, "foo") expect(t, globalFlagSet, true) } func TestGlobalFlagsInSubcommands(t *testing.T) { subcommandRun := false parentFlag := false app := NewApp() app.Flags = []Flag{ BoolFlag{Name: "debug, d", Usage: "Enable debugging"}, } app.Commands = []Command{ Command{ Name: "foo", Flags: []Flag{ BoolFlag{Name: "parent, p", Usage: "Parent flag"}, }, Subcommands: []Command{ { Name: "bar", Action: func(c *Context) { if c.GlobalBool("debug") { subcommandRun = true } if c.GlobalBool("parent") { parentFlag = true } }, }, }, }, } app.Run([]string{"command", "-d", "foo", "-p", "bar"}) expect(t, subcommandRun, true) expect(t, parentFlag, true) } 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 := NewApp() buf := new(bytes.Buffer) app.Writer = buf subCmdBar := Command{ Name: "bar", Usage: "does bar things", } subCmdBaz := Command{ Name: "baz", Usage: "does baz things", } cmd := Command{ Name: "foo", Description: "descriptive wall of text about how it does foo things", Subcommands: []Command{subCmdBar, subCmdBaz}, } app.Commands = []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_Run_SubcommandFullPath(t *testing.T) { app := NewApp() buf := new(bytes.Buffer) app.Writer = buf app.Name = "command" subCmd := Command{ Name: "bar", Usage: "does bar things", } cmd := Command{ Name: "foo", Description: "foo commands", Subcommands: []Command{subCmd}, } app.Commands = []Command{cmd} err := app.Run([]string{"command", "foo", "bar", "--help"}) if err != nil { t.Error(err) } output := buf.String() if !strings.Contains(output, "command 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_Run_SubcommandHelpName(t *testing.T) { app := NewApp() buf := new(bytes.Buffer) app.Writer = buf app.Name = "command" subCmd := Command{ Name: "bar", HelpName: "custom", Usage: "does bar things", } cmd := Command{ Name: "foo", Description: "foo commands", Subcommands: []Command{subCmd}, } app.Commands = []Command{cmd} err := app.Run([]string{"command", "foo", "bar", "--help"}) if err != nil { t.Error(err) } output := buf.String() if !strings.Contains(output, "custom - does bar things") { t.Errorf("expected HelpName for subcommand: %s", output) } if !strings.Contains(output, "custom [arguments...]") { t.Errorf("expected HelpName to subcommand: %s", output) } } func TestApp_Run_CommandHelpName(t *testing.T) { app := NewApp() buf := new(bytes.Buffer) app.Writer = buf app.Name = "command" subCmd := Command{ Name: "bar", Usage: "does bar things", } cmd := Command{ Name: "foo", HelpName: "custom", Description: "foo commands", Subcommands: []Command{subCmd}, } app.Commands = []Command{cmd} err := app.Run([]string{"command", "foo", "bar", "--help"}) if err != nil { t.Error(err) } output := buf.String() if !strings.Contains(output, "command 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_Run_CommandSubcommandHelpName(t *testing.T) { app := NewApp() buf := new(bytes.Buffer) app.Writer = buf app.Name = "base" subCmd := Command{ Name: "bar", HelpName: "custom", Usage: "does bar things", } cmd := Command{ Name: "foo", Description: "foo commands", Subcommands: []Command{subCmd}, } app.Commands = []Command{cmd} err := app.Run([]string{"command", "foo", "--help"}) if err != nil { t.Error(err) } output := buf.String() if !strings.Contains(output, "base foo - foo commands") { t.Errorf("expected full path to subcommand: %s", output) } if !strings.Contains(output, "base foo command [command options] [arguments...]") { t.Errorf("expected full path to subcommand: %s", output) } } func TestApp_Run_Help(t *testing.T) { var helpArguments = [][]string{{"boom", "--help"}, {"boom", "-h"}, {"boom", "help"}} for _, args := range helpArguments { buf := new(bytes.Buffer) t.Logf("==> checking with arguments %v", args) app := NewApp() app.Name = "boom" app.Usage = "make an explosive entrance" app.Writer = buf app.Action = func(c *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, "boom - make an explosive entrance") { t.Errorf("want help to contain %q, did not: \n%q", "boom - make an explosive entrance", output) } } } 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 := NewApp() app.Name = "boom" app.Usage = "make an explosive entrance" app.Version = "0.1.0" app.Writer = buf app.Action = func(c *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 TestApp_Run_DoesNotOverwriteErrorFromBefore(t *testing.T) { app := NewApp() app.Action = func(c *Context) {} app.Before = func(c *Context) error { return fmt.Errorf("before error") } app.After = func(c *Context) error { return fmt.Errorf("after error") } err := app.Run([]string{"foo"}) if err == nil { t.Fatalf("expected to recieve error from Run, got none") } if !strings.Contains(err.Error(), "before error") { t.Errorf("expected text of error from Before method, but got none in \"%v\"", err) } if !strings.Contains(err.Error(), "after error") { t.Errorf("expected text of error from After method, but got none in \"%v\"", err) } } func TestApp_Run_SubcommandDoesNotOverwriteErrorFromBefore(t *testing.T) { app := NewApp() app.Commands = []Command{ Command{ Name: "bar", Before: func(c *Context) error { return fmt.Errorf("before error") }, After: func(c *Context) error { return fmt.Errorf("after error") }, }, } err := app.Run([]string{"foo", "bar"}) if err == nil { t.Fatalf("expected to recieve error from Run, got none") } if !strings.Contains(err.Error(), "before error") { t.Errorf("expected text of error from Before method, but got none in \"%v\"", err) } if !strings.Contains(err.Error(), "after error") { t.Errorf("expected text of error from After method, but got none in \"%v\"", err) } }