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package cli_test
import (
"context"
"fmt"
"net/mail"
"os"
"time"
// Alias the package import to make the examples runnable on pkg.go.dev.
//
// See issue #1811.
cli "github.com/urfave/cli/v3"
)
func ExampleCommand_Run() {
// Declare a command
cmd := &cli.Command{
Name: "greet",
Flags: []cli.Flag{
&cli.StringFlag{Name: "name", Value: "pat", Usage: "a name to say"},
},
Action: func(_ context.Context, cmd *cli.Command) error {
fmt.Printf("Hello %[1]v\n", cmd.String("name"))
return nil
},
Authors: []any{
&mail.Address{Name: "Oliver Allen", Address: "oliver@toyshop.example.com"},
"gruffalo@soup-world.example.org",
},
Version: "v0.13.12",
}
// Simulate the command line arguments
os.Args = []string{"greet", "--name", "Jeremy"}
if err := cmd.Run(context.Background(), os.Args); err != nil {
// do something with unhandled errors
fmt.Fprintf(os.Stderr, "Unhandled error: %[1]v\n", err)
os.Exit(86)
}
// Output:
// Hello Jeremy
}
func ExampleCommand_Run_subcommand() {
cmd := &cli.Command{
Name: "say",
Commands: []*cli.Command{
{
Name: "hello",
Aliases: []string{"hi"},
Usage: "use it to see a description",
Description: "This is how we describe hello the function",
Commands: []*cli.Command{
{
Name: "english",
Aliases: []string{"en"},
Usage: "sends a greeting in english",
Description: "greets someone in english",
Flags: []cli.Flag{
&cli.StringFlag{
Name: "name",
Value: "Bob",
Usage: "Name of the person to greet",
},
},
Action: func(_ context.Context, cmd *cli.Command) error {
fmt.Println("Hello,", cmd.String("name"))
return nil
},
},
},
},
},
}
ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
defer cancel()
// Simulate the command line arguments
os.Args = []string{"say", "hi", "english", "--name", "Jeremy"}
_ = cmd.Run(ctx, os.Args)
// Output:
// Hello, Jeremy
}
func ExampleCommand_Run_appHelp() {
cmd := &cli.Command{
Name: "greet",
Version: "0.1.0",
Description: "This is how we describe greet the app",
Authors: []any{
&mail.Address{Name: "Harrison", Address: "harrison@lolwut.example.com"},
"Oliver Allen <oliver@toyshop.example.com>",
},
Flags: []cli.Flag{
&cli.StringFlag{Name: "name", Value: "bob", Usage: "a name to say"},
},
Arguments: cli.AnyArguments,
Commands: []*cli.Command{
{
Name: "describeit",
Aliases: []string{"d"},
Usage: "use it to see a description",
Description: "This is how we describe describeit the function",
ArgsUsage: "[arguments...]",
Action: func(context.Context, *cli.Command) error {
fmt.Printf("i like to describe things")
return nil
},
},
},
}
ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
defer cancel()
// Simulate the command line arguments
os.Args = []string{"greet", "help"}
_ = cmd.Run(ctx, os.Args)
// Output:
// NAME:
// greet - A new cli application
//
// USAGE:
// greet [global options] [command [command options]] [arguments...]
//
// VERSION:
// 0.1.0
//
// DESCRIPTION:
// This is how we describe greet the app
//
// AUTHORS:
// "Harrison" <harrison@lolwut.example.com>
// Oliver Allen <oliver@toyshop.example.com>
//
// COMMANDS:
// describeit, d use it to see a description
// help, h Shows a list of commands or help for one command
//
// GLOBAL OPTIONS:
// --name string a name to say (default: "bob")
// --help, -h show help
// --version, -v print the version
}
func ExampleCommand_Run_commandHelp() {
cmd := &cli.Command{
Name: "greet",
Flags: []cli.Flag{
&cli.StringFlag{Name: "name", Value: "pat", Usage: "a name to say"},
},
Action: func(_ context.Context, cmd *cli.Command) error {
fmt.Fprintf(cmd.Root().Writer, "hello to %[1]q\n", cmd.String("name"))
return nil
},
Commands: []*cli.Command{
{
Name: "describeit",
Aliases: []string{"d"},
Usage: "use it to see a description",
Description: "This is how we describe describeit the function",
ArgsUsage: "[arguments...]",
Action: func(context.Context, *cli.Command) error {
fmt.Println("i like to describe things")
return nil
},
},
},
}
// Simulate the command line arguments
os.Args = []string{"greet", "h", "describeit"}
_ = cmd.Run(context.Background(), 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
//
// OPTIONS:
// --help, -h show help
}
func ExampleCommand_Run_noAction() {
cmd := &cli.Command{Name: "greet"}
// Simulate the command line arguments
os.Args = []string{"greet"}
_ = cmd.Run(context.Background(), os.Args)
// Output:
// NAME:
// greet - A new cli application
//
// USAGE:
// greet [global options]
//
// GLOBAL OPTIONS:
// --help, -h show help
}
func ExampleCommand_Run_subcommandNoAction() {
cmd := &cli.Command{
Name: "greet",
Commands: []*cli.Command{
{
Name: "describeit",
Aliases: []string{"d"},
Usage: "use it to see a description",
ArgsUsage: "[arguments...]",
Description: "This is how we describe describeit the function",
},
},
}
// Simulate the command line arguments
os.Args = []string{"greet", "describeit"}
_ = cmd.Run(context.Background(), os.Args)
// Output:
// NAME:
// greet describeit - use it to see a description
//
// USAGE:
// greet describeit [options] [arguments...]
//
// DESCRIPTION:
// This is how we describe describeit the function
//
// OPTIONS:
// --help, -h show help
}
func ExampleCommand_Run_shellComplete_bash_withShortFlag() {
cmd := &cli.Command{
Name: "greet",
EnableShellCompletion: true,
Flags: []cli.Flag{
&cli.Int64Flag{
Name: "other",
Aliases: []string{"o"},
},
&cli.StringFlag{
Name: "xyz",
Aliases: []string{"x"},
},
},
}
// Simulate a bash environment and command line arguments
os.Setenv("SHELL", "bash")
os.Args = []string{"greet", "-", "--generate-shell-completion"}
_ = cmd.Run(context.Background(), os.Args)
// Output:
// --other
// --xyz
// --help
}
func ExampleCommand_Run_shellComplete_bash_withLongFlag() {
cmd := &cli.Command{
Name: "greet",
EnableShellCompletion: true,
Flags: []cli.Flag{
&cli.Int64Flag{
Name: "other",
Aliases: []string{"o"},
},
&cli.StringFlag{
Name: "xyz",
Aliases: []string{"x"},
},
&cli.StringFlag{
Name: "some-flag,s",
},
&cli.StringFlag{
Name: "similar-flag",
},
},
}
// Simulate a bash environment and command line arguments
os.Setenv("SHELL", "bash")
os.Args = []string{"greet", "--s", "--generate-shell-completion"}
_ = cmd.Run(context.Background(), os.Args)
// Output:
// --some-flag
// --similar-flag
}
func ExampleCommand_Run_shellComplete_bash_withMultipleLongFlag() {
cmd := &cli.Command{
Name: "greet",
EnableShellCompletion: true,
Flags: []cli.Flag{
&cli.Int64Flag{
Name: "int-flag",
Aliases: []string{"i"},
},
&cli.StringFlag{
Name: "string",
Aliases: []string{"s"},
},
&cli.StringFlag{
Name: "string-flag-2",
},
&cli.StringFlag{
Name: "similar-flag",
},
&cli.StringFlag{
Name: "some-flag",
},
},
}
// Simulate a bash environment and command line arguments
os.Setenv("SHELL", "bash")
os.Args = []string{"greet", "--st", "--generate-shell-completion"}
_ = cmd.Run(context.Background(), os.Args)
// Output:
// --string
// --string-flag-2
}
func ExampleCommand_Run_shellComplete_bash() {
cmd := &cli.Command{
Name: "greet",
EnableShellCompletion: true,
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(context.Context, *cli.Command) error {
fmt.Printf("i like to describe things")
return nil
},
}, {
Name: "next",
Usage: "next example",
Description: "more stuff to see when generating shell completion",
Action: func(context.Context, *cli.Command) error {
fmt.Printf("the next example")
return nil
},
},
},
}
// Simulate a bash environment and command line arguments
os.Setenv("SHELL", "bash")
os.Args = []string{"greet", "--generate-shell-completion"}
_ = cmd.Run(context.Background(), os.Args)
// Output:
// describeit
// next
// help
}
func ExampleCommand_Run_shellComplete_zsh() {
cmd := &cli.Command{
Name: "greet",
EnableShellCompletion: true,
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(context.Context, *cli.Command) error {
fmt.Printf("i like to describe things")
return nil
},
}, {
Name: "next",
Usage: "next example",
Description: "more stuff to see when generating bash completion",
Action: func(context.Context, *cli.Command) error {
fmt.Printf("the next example")
return nil
},
},
},
}
// Simulate a zsh environment and command line arguments
os.Args = []string{"greet", "--generate-shell-completion"}
os.Setenv("SHELL", "/usr/bin/zsh")
_ = cmd.Run(context.Background(), os.Args)
// Output:
// describeit:use it to see a description
// next:next example
// help:Shows a list of commands or help for one command
}
func ExampleCommand_Run_sliceValues() {
cmd := &cli.Command{
Name: "multi_values",
Flags: []cli.Flag{
&cli.StringSliceFlag{Name: "stringSlice"},
&cli.FloatSliceFlag{Name: "float64Slice"},
&cli.Int64SliceFlag{Name: "intSlice"},
},
HideHelp: true,
Action: func(ctx context.Context, cmd *cli.Command) error {
for i, v := range cmd.FlagNames() {
fmt.Printf("%d-%s %#v\n", i, v, cmd.Value(v))
}
err := ctx.Err()
fmt.Println("error:", err)
return err
},
}
// Simulate command line arguments
os.Args = []string{
"multi_values",
"--stringSlice", "parsed1,parsed2", "--stringSlice", "parsed3,parsed4",
"--float64Slice", "13.3,14.4", "--float64Slice", "15.5,16.6",
"--intSlice", "13,14", "--intSlice", "15,16",
}
_ = cmd.Run(context.Background(), os.Args)
// Output:
// 0-stringSlice []string{"parsed1", "parsed2", "parsed3", "parsed4"}
// 1-float64Slice []float64{13.3, 14.4, 15.5, 16.6}
// 2-intSlice []int64{13, 14, 15, 16}
// error: <nil>
}
func ExampleCommand_Run_mapValues() {
cmd := &cli.Command{
Name: "multi_values",
Flags: []cli.Flag{
&cli.StringMapFlag{Name: "stringMap"},
},
HideHelp: true,
Action: func(ctx context.Context, cmd *cli.Command) error {
for i, v := range cmd.FlagNames() {
fmt.Printf("%d-%s %#v\n", i, v, cmd.StringMap(v))
}
fmt.Printf("notfound %#v\n", cmd.StringMap("notfound"))
err := ctx.Err()
fmt.Println("error:", err)
return err
},
}
// Simulate command line arguments
os.Args = []string{
"multi_values",
"--stringMap", "parsed1=parsed two", "--stringMap", "parsed3=",
}
_ = cmd.Run(context.Background(), os.Args)
// Output:
// 0-stringMap map[string]string{"parsed1":"parsed two", "parsed3":""}
// notfound map[string]string(nil)
// error: <nil>
}
func ExampleBoolWithInverseFlag() {
flagWithInverse := &cli.BoolWithInverseFlag{
Name: "env",
}
cmd := &cli.Command{
Flags: []cli.Flag{
flagWithInverse,
},
Action: func(_ context.Context, cmd *cli.Command) error {
if flagWithInverse.IsSet() {
if cmd.Bool("env") {
fmt.Println("env is set")
} else {
fmt.Println("no-env is set")
}
}
return nil
},
}
_ = cmd.Run(context.Background(), []string{"prog", "--no-env"})
fmt.Println("flags:", len(flagWithInverse.Names()))
// Output:
// no-env is set
// flags: 2
}
func ExampleCommand_Suggest() {
cmd := &cli.Command{
Name: "greet",
ErrWriter: os.Stdout,
Suggest: true,
HideHelp: false,
HideHelpCommand: true,
CustomRootCommandHelpTemplate: "(this space intentionally left blank)\n",
Flags: []cli.Flag{
&cli.StringFlag{Name: "name", Value: "squirrel", Usage: "a name to say"},
},
Action: func(_ context.Context, cmd *cli.Command) error {
fmt.Printf("Hello %v\n", cmd.String("name"))
return nil
},
}
if cmd.Run(context.Background(), []string{"greet", "--nema", "chipmunk"}) == nil {
fmt.Println("Expected error")
}
// Output:
// Incorrect Usage: flag provided but not defined: -nema
//
// Did you mean "--name"?
//
// (this space intentionally left blank)
}
func ExampleCommand_Suggest_command() {
cmd := &cli.Command{
ErrWriter: os.Stdout,
Name: "greet",
Flags: []cli.Flag{
&cli.StringFlag{Name: "name", Value: "squirrel", Usage: "a name to say"},
},
Action: func(_ context.Context, cmd *cli.Command) error {
fmt.Printf("Hello %v\n", cmd.String("name"))
return nil
},
Commands: []*cli.Command{
{
Name: "neighbors",
HideHelp: true,
HideHelpCommand: true,
Suggest: true,
CustomHelpTemplate: "(this space intentionally left blank)\n",
Flags: []cli.Flag{
&cli.BoolFlag{Name: "smiling"},
},
Action: func(_ context.Context, cmd *cli.Command) error {
if cmd.Bool("smiling") {
fmt.Println("😀")
}
fmt.Println("Hello, neighbors")
return nil
},
},
},
}
if cmd.Run(context.Background(), []string{"greet", "neighbors", "--sliming"}) == nil {
fmt.Println("Expected error")
}
// Output:
// Incorrect Usage: flag provided but not defined: -sliming
//
// Did you mean "--smiling"?
}