36 KiB
cli
This is the library formerly known as github.com/codegangsta/cli
-- Github
will automatically redirect requests to this repository, but we recommend
updating your references for clarity.
cli is a simple, fast, and fun package for building command line apps in Go. The goal is to enable developers to write fast and distributable command line applications in an expressive way.
- Overview
- Installation
- Getting Started
- Examples
- Contribution Guidelines
Overview
Command line apps are usually so tiny that there is absolutely no reason why your code should not be self-documenting. Things like generating help text and parsing command flags/options should not hinder productivity when writing a command line app.
This is where cli comes into play. cli makes command line programming fun, organized, and expressive!
Installation
Make sure you have a working Go environment. Go version 1.2+ is supported. See the install instructions for Go.
To install cli, simply run:
$ go get github.com/urfave/cli
Make sure your PATH
includes the $GOPATH/bin
directory so your commands can
be easily used:
export PATH=$PATH:$GOPATH/bin
Supported platforms
cli is tested against multiple versions of Go on Linux, and against the latest
released version of Go on OS X and Windows. For full details, see
./.travis.yml
and ./appveyor.yml
.
Using the v2
branch
Warning: The v2
branch is currently unreleased and considered unstable.
There is currently a long-lived branch named v2
that is intended to land as
the new master
branch once development there has settled down. The current
master
branch (mirrored as v1
) is being manually merged into v2
on
an irregular human-based schedule, but generally if one wants to "upgrade" to
v2
now and accept the volatility (read: "awesomeness") that comes along with
that, please use whatever version pinning of your preference, such as via
gopkg.in
:
$ go get gopkg.in/urfave/cli.v2
...
import (
"gopkg.in/urfave/cli.v2" // imports as package "cli"
)
...
Pinning to the v1
releases
Similarly to the section above describing use of the v2
branch, if one wants
to avoid any unexpected compatibility pains once v2
becomes master
, then
pinning to v1
is an acceptable option, e.g.:
$ go get gopkg.in/urfave/cli.v1
...
import (
"gopkg.in/urfave/cli.v1" // imports as package "cli"
)
...
This will pull the latest tagged v1
release (e.g. v1.18.1
at the time of writing).
Getting Started
One of the philosophies behind cli is that an API should be playful and full of
discovery. So a cli app can be as little as one line of code in main()
.
package main
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
err := cli.NewApp().Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
This app will run and show help text, but is not very useful. Let's give an action to execute and some help documentation:
package main
import (
"fmt"
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Name = "boom"
app.Usage = "make an explosive entrance"
app.Action = func(c *cli.Context) error {
fmt.Println("boom! I say!")
return nil
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Running this already gives you a ton of functionality, plus support for things like subcommands and flags, which are covered below.
Examples
Being a programmer can be a lonely job. Thankfully by the power of automation that is not the case! Let's create a greeter app to fend off our demons of loneliness!
Start by creating a directory named greet
, and within it, add a file,
greet.go
with the following code in it:
package main
import (
"fmt"
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Name = "greet"
app.Usage = "fight the loneliness!"
app.Action = func(c *cli.Context) error {
fmt.Println("Hello friend!")
return nil
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Install our command to the $GOPATH/bin
directory:
$ go install
Finally run our new command:
$ greet
Hello friend!
cli also generates neat help text:
$ greet help
NAME:
greet - fight the loneliness!
USAGE:
greet [global options] command [command options] [arguments...]
VERSION:
0.0.0
COMMANDS:
help, h Shows a list of commands or help for one command
GLOBAL OPTIONS
--version Shows version information
Arguments
You can lookup arguments by calling the Args
function on cli.Context
, e.g.:
package main
import (
"fmt"
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Action = func(c *cli.Context) error {
fmt.Printf("Hello %q", c.Args().Get(0))
return nil
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Flags
Setting and querying flags is simple.
package main
import (
"fmt"
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Flags = []cli.Flag {
cli.StringFlag{
Name: "lang",
Value: "english",
Usage: "language for the greeting",
},
}
app.Action = func(c *cli.Context) error {
name := "Nefertiti"
if c.NArg() > 0 {
name = c.Args().Get(0)
}
if c.String("lang") == "spanish" {
fmt.Println("Hola", name)
} else {
fmt.Println("Hello", name)
}
return nil
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
You can also set a destination variable for a flag, to which the content will be scanned.
package main
import (
"log"
"os"
"fmt"
"github.com/urfave/cli"
)
func main() {
var language string
app := cli.NewApp()
app.Flags = []cli.Flag {
cli.StringFlag{
Name: "lang",
Value: "english",
Usage: "language for the greeting",
Destination: &language,
},
}
app.Action = func(c *cli.Context) error {
name := "someone"
if c.NArg() > 0 {
name = c.Args()[0]
}
if language == "spanish" {
fmt.Println("Hola", name)
} else {
fmt.Println("Hello", name)
}
return nil
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
See full list of flags at http://godoc.org/github.com/urfave/cli
Placeholder Values
Sometimes it's useful to specify a flag's value within the usage string itself. Such placeholders are indicated with back quotes.
For example this:
package main
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "config, c",
Usage: "Load configuration from `FILE`",
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Will result in help output like:
--config FILE, -c FILE Load configuration from FILE
Note that only the first placeholder is used. Subsequent back-quoted words will be left as-is.
Alternate Names
You can set alternate (or short) names for flags by providing a comma-delimited
list for the Name
. e.g.
package main
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Flags = []cli.Flag {
cli.StringFlag{
Name: "lang, l",
Value: "english",
Usage: "language for the greeting",
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
That flag can then be set with --lang spanish
or -l spanish
. Note that
giving two different forms of the same flag in the same command invocation is an
error.
Ordering
Flags for the application and commands are shown in the order they are defined.
However, it's possible to sort them from outside this library by using FlagsByName
or CommandsByName
with sort
.
For example this:
package main
import (
"log"
"os"
"sort"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Flags = []cli.Flag {
cli.StringFlag{
Name: "lang, l",
Value: "english",
Usage: "Language for the greeting",
},
cli.StringFlag{
Name: "config, c",
Usage: "Load configuration from `FILE`",
},
}
app.Commands = []cli.Command{
{
Name: "complete",
Aliases: []string{"c"},
Usage: "complete a task on the list",
Action: func(c *cli.Context) error {
return nil
},
},
{
Name: "add",
Aliases: []string{"a"},
Usage: "add a task to the list",
Action: func(c *cli.Context) error {
return nil
},
},
}
sort.Sort(cli.FlagsByName(app.Flags))
sort.Sort(cli.CommandsByName(app.Commands))
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Will result in help output like:
--config FILE, -c FILE Load configuration from FILE
--lang value, -l value Language for the greeting (default: "english")
Required Flags
You can make a flag required by setting the Required
field to true
. If an end-user
fails to provide a required flag, they will be shown a default error message, or a
custom message if one is defined. To define a custom error message for a required flag,
set the RequiredFlagErr
field equal to a cli.FlagErr
struct with a Custom
field of true
and a Message
field containing the custom error message. Default and custom error messages
can be mixed with default messages displayed before custom messages.
For example this:
package main
import (
"log"
"os"
"strings"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Flags = []cli.Flag {
cli.StringFlag{
Name: "lang",
Value: "english",
Usage: "language for the greeting",
Required: true,
RequiredFlagErr: cli.FlagErr{
Custom: true,
Message: `There's a problem: "lang" is a required flag` ,
},
},
cli.StringFlag{
Name: "mood",
Value: "normal",
Usage: "emphasis for the greeting",
Required: true,
},
}
app.Action = func(c *cli.Context) error {
name := "Nefertiti"
if c.NArg() > 0 {
name = c.Args().Get(0)
}
var output string
if c.String("lang") == "spanish" {
output = "Hola " + name
} else {
output = "Hello " + name
}
if c.String("mood") == "excited" {
output = strings.ToUpper(output)
}
return nil
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Creates an app that requires both lang
and mood
flags. If an attempt
to run the app is made without either, the end-user will see the following
prompts:
Required flag "mood" not set
There's a problem: "lang" is a required flag
Values from the Environment
You can also have the default value set from the environment via EnvVar
. e.g.
package main
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Flags = []cli.Flag {
cli.StringFlag{
Name: "lang, l",
Value: "english",
Usage: "language for the greeting",
EnvVar: "APP_LANG",
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
The EnvVar
may also be given as a comma-delimited "cascade", where the first
environment variable that resolves is used as the default.
package main
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Flags = []cli.Flag {
cli.StringFlag{
Name: "lang, l",
Value: "english",
Usage: "language for the greeting",
EnvVar: "LEGACY_COMPAT_LANG,APP_LANG,LANG",
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Values from files
You can also have the default value set from file via FilePath
. e.g.
package main
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Flags = []cli.Flag {
cli.StringFlag{
Name: "password, p",
Usage: "password for the mysql database",
FilePath: "/etc/mysql/password",
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Note that default values set from file (e.g. FilePath
) take precedence over
default values set from the environment (e.g. EnvVar
).
Values from alternate input sources (YAML, TOML, and others)
There is a separate package altsrc that adds support for getting flag values from other file input sources.
Currently supported input source formats:
- YAML
- JSON
- TOML
In order to get values for a flag from an alternate input source the following code would be added to wrap an existing cli.Flag like below:
altsrc.NewIntFlag(cli.IntFlag{Name: "test"})
Initialization must also occur for these flags. Below is an example initializing getting data from a yaml file below.
command.Before = altsrc.InitInputSourceWithContext(command.Flags, NewYamlSourceFromFlagFunc("load"))
The code above will use the "load" string as a flag name to get the file name of a yaml file from the cli.Context. It will then use that file name to initialize the yaml input source for any flags that are defined on that command. As a note the "load" flag used would also have to be defined on the command flags in order for this code snipped to work.
Currently only YAML, JSON, and TOML files are supported but developers can add support for other input sources by implementing the altsrc.InputSourceContext for their given sources.
Here is a more complete sample of a command using YAML support:
package notmain
import (
"fmt"
"log"
"os"
"github.com/urfave/cli"
"github.com/urfave/cli/altsrc"
)
func main() {
app := cli.NewApp()
flags := []cli.Flag{
altsrc.NewIntFlag(cli.IntFlag{Name: "test"}),
cli.StringFlag{Name: "load"},
}
app.Action = func(c *cli.Context) error {
fmt.Println("yaml ist rad")
return nil
}
app.Before = altsrc.InitInputSourceWithContext(flags, altsrc.NewYamlSourceFromFlagFunc("load"))
app.Flags = flags
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Precedence
The precedence for flag value sources is as follows (highest to lowest):
- Command line flag value from user
- Environment variable (if specified)
- Configuration file (if specified)
- Default defined on the flag
Subcommands
Subcommands can be defined for a more git-like command line app.
package main
import (
"fmt"
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Commands = []cli.Command{
{
Name: "add",
Aliases: []string{"a"},
Usage: "add a task to the list",
Action: func(c *cli.Context) error {
fmt.Println("added task: ", c.Args().First())
return nil
},
},
{
Name: "complete",
Aliases: []string{"c"},
Usage: "complete a task on the list",
Action: func(c *cli.Context) error {
fmt.Println("completed task: ", c.Args().First())
return nil
},
},
{
Name: "template",
Aliases: []string{"t"},
Usage: "options for task templates",
Subcommands: []cli.Command{
{
Name: "add",
Usage: "add a new template",
Action: func(c *cli.Context) error {
fmt.Println("new task template: ", c.Args().First())
return nil
},
},
{
Name: "remove",
Usage: "remove an existing template",
Action: func(c *cli.Context) error {
fmt.Println("removed task template: ", c.Args().First())
return nil
},
},
},
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Subcommands categories
For additional organization in apps that have many subcommands, you can associate a category for each command to group them together in the help output.
E.g.
package main
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Commands = []cli.Command{
{
Name: "noop",
},
{
Name: "add",
Category: "Template actions",
},
{
Name: "remove",
Category: "Template actions",
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Will include:
COMMANDS:
noop
Template actions:
add
remove
Exit code
Calling App.Run
will not automatically call os.Exit
, which means that by
default the exit code will "fall through" to being 0
. An explicit exit code
may be set by returning a non-nil error that fulfills cli.ExitCoder
, or a
cli.MultiError
that includes an error that fulfills cli.ExitCoder
, e.g.:
package main
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Flags = []cli.Flag{
cli.BoolFlag{
Name: "ginger-crouton",
Usage: "Add ginger croutons to the soup",
},
}
app.Action = func(ctx *cli.Context) error {
if !ctx.Bool("ginger-crouton") {
return cli.NewExitError("Ginger croutons are not in the soup", 86)
}
return nil
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Combining short options
Traditional use of options using their shortnames look like this:
$ cmd -s -o -m "Some message"
Suppose you want users to be able to combine options with their shortnames. This
can be done using the UseShortOptionHandling
bool in your app configuration,
or for individual commands by attaching it to the command configuration. For
example:
package main
import (
"fmt"
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.UseShortOptionHandling = true
app.Commands = []cli.Command{
{
Name: "short",
Usage: "complete a task on the list",
Flags: []cli.Flag{
cli.BoolFlag{Name: "serve, s"},
cli.BoolFlag{Name: "option, o"},
cli.StringFlag{Name: "message, m"},
},
Action: func(c *cli.Context) error {
fmt.Println("serve:", c.Bool("serve"))
fmt.Println("option:", c.Bool("option"))
fmt.Println("message:", c.String("message"))
return nil
},
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
If your program has any number of bool flags such as serve
and option
, and
optionally one non-bool flag message
, with the short options of -s
, -o
,
and -m
respectively, setting UseShortOptionHandling
will also support the
following syntax:
$ cmd -som "Some message"
If you enable UseShortOptionHandling
, then you must not use any flags that
have a single leading -
or this will result in failures. For example,
-option
can no longer be used. Flags with two leading dashes (such as
--options
) are still valid.
Bash Completion
You can enable completion commands by setting the EnableBashCompletion
flag on the App
object. By default, this setting will only auto-complete to
show an app's subcommands, but you can write your own completion methods for
the App or its subcommands.
package main
import (
"fmt"
"log"
"os"
"github.com/urfave/cli"
)
func main() {
tasks := []string{"cook", "clean", "laundry", "eat", "sleep", "code"}
app := cli.NewApp()
app.EnableBashCompletion = true
app.Commands = []cli.Command{
{
Name: "complete",
Aliases: []string{"c"},
Usage: "complete a task on the list",
Action: func(c *cli.Context) error {
fmt.Println("completed task: ", c.Args().First())
return nil
},
BashComplete: func(c *cli.Context) {
// This will complete if no args are passed
if c.NArg() > 0 {
return
}
for _, t := range tasks {
fmt.Println(t)
}
},
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Enabling
Source the autocomplete/bash_autocomplete
file in your .bashrc
file while
setting the PROG
variable to the name of your program:
PROG=myprogram source /.../cli/autocomplete/bash_autocomplete
Distribution
Copy autocomplete/bash_autocomplete
into /etc/bash_completion.d/
and rename
it to the name of the program you wish to add autocomplete support for (or
automatically install it there if you are distributing a package). Don't forget
to source the file to make it active in the current shell.
sudo cp src/bash_autocomplete /etc/bash_completion.d/<myprogram>
source /etc/bash_completion.d/<myprogram>
Alternatively, you can just document that users should source the generic
autocomplete/bash_autocomplete
in their bash configuration with $PROG
set
to the name of their program (as above).
Customization
The default bash completion flag (--generate-bash-completion
) is defined as
cli.BashCompletionFlag
, and may be redefined if desired, e.g.:
package main
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
cli.BashCompletionFlag = cli.BoolFlag{
Name: "compgen",
Hidden: true,
}
app := cli.NewApp()
app.EnableBashCompletion = true
app.Commands = []cli.Command{
{
Name: "wat",
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Generated Help Text
The default help flag (-h/--help
) is defined as cli.HelpFlag
and is checked
by the cli internals in order to print generated help text for the app, command,
or subcommand, and break execution.
Customization
All of the help text generation may be customized, and at multiple levels. The
templates are exposed as variables AppHelpTemplate
, CommandHelpTemplate
, and
SubcommandHelpTemplate
which may be reassigned or augmented, and full override
is possible by assigning a compatible func to the cli.HelpPrinter
variable,
e.g.:
package main
import (
"fmt"
"log"
"io"
"os"
"github.com/urfave/cli"
)
func main() {
// EXAMPLE: Append to an existing template
cli.AppHelpTemplate = fmt.Sprintf(`%s
WEBSITE: http://awesometown.example.com
SUPPORT: support@awesometown.example.com
`, cli.AppHelpTemplate)
// EXAMPLE: Override a template
cli.AppHelpTemplate = `NAME:
{{.Name}} - {{.Usage}}
USAGE:
{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}
{{if len .Authors}}
AUTHOR:
{{range .Authors}}{{ . }}{{end}}
{{end}}{{if .Commands}}
COMMANDS:
{{range .Commands}}{{if not .HideHelp}} {{join .Names ", "}}{{ "\t"}}{{.Usage}}{{ "\n" }}{{end}}{{end}}{{end}}{{if .VisibleFlags}}
GLOBAL OPTIONS:
{{range .VisibleFlags}}{{.}}
{{end}}{{end}}{{if .Copyright }}
COPYRIGHT:
{{.Copyright}}
{{end}}{{if .Version}}
VERSION:
{{.Version}}
{{end}}
`
// EXAMPLE: Replace the `HelpPrinter` func
cli.HelpPrinter = func(w io.Writer, templ string, data interface{}) {
fmt.Println("Ha HA. I pwnd the help!!1")
}
err := cli.NewApp().Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
The default flag may be customized to something other than -h/--help
by
setting cli.HelpFlag
, e.g.:
package main
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
cli.HelpFlag = cli.BoolFlag{
Name: "halp, haaaaalp",
Usage: "HALP",
EnvVar: "SHOW_HALP,HALPPLZ",
}
err := cli.NewApp().Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Version Flag
The default version flag (-v/--version
) is defined as cli.VersionFlag
, which
is checked by the cli internals in order to print the App.Version
via
cli.VersionPrinter
and break execution.
Customization
The default flag may be customized to something other than -v/--version
by
setting cli.VersionFlag
, e.g.:
package main
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
cli.VersionFlag = cli.BoolFlag{
Name: "print-version, V",
Usage: "print only the version",
}
app := cli.NewApp()
app.Name = "partay"
app.Version = "19.99.0"
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Alternatively, the version printer at cli.VersionPrinter
may be overridden, e.g.:
package main
import (
"fmt"
"log"
"os"
"github.com/urfave/cli"
)
var (
Revision = "fafafaf"
)
func main() {
cli.VersionPrinter = func(c *cli.Context) {
fmt.Printf("version=%s revision=%s\n", c.App.Version, Revision)
}
app := cli.NewApp()
app.Name = "partay"
app.Version = "19.99.0"
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
Full API Example
Notice: This is a contrived (functioning) example meant strictly for API demonstration purposes. Use of one's imagination is encouraged.
package main
import (
"errors"
"flag"
"fmt"
"io"
"io/ioutil"
"os"
"time"
"github.com/urfave/cli"
)
func init() {
cli.AppHelpTemplate += "\nCUSTOMIZED: you bet ur muffins\n"
cli.CommandHelpTemplate += "\nYMMV\n"
cli.SubcommandHelpTemplate += "\nor something\n"
cli.HelpFlag = cli.BoolFlag{Name: "halp"}
cli.BashCompletionFlag = cli.BoolFlag{Name: "compgen", Hidden: true}
cli.VersionFlag = cli.BoolFlag{Name: "print-version, V"}
cli.HelpPrinter = func(w io.Writer, templ string, data interface{}) {
fmt.Fprintf(w, "best of luck to you\n")
}
cli.VersionPrinter = func(c *cli.Context) {
fmt.Fprintf(c.App.Writer, "version=%s\n", c.App.Version)
}
cli.OsExiter = func(c int) {
fmt.Fprintf(cli.ErrWriter, "refusing to exit %d\n", c)
}
cli.ErrWriter = ioutil.Discard
cli.FlagStringer = func(fl cli.Flag) string {
return fmt.Sprintf("\t\t%s", fl.GetName())
}
}
type hexWriter struct{}
func (w *hexWriter) Write(p []byte) (int, error) {
for _, b := range p {
fmt.Printf("%x", b)
}
fmt.Printf("\n")
return len(p), nil
}
type genericType struct{
s string
}
func (g *genericType) Set(value string) error {
g.s = value
return nil
}
func (g *genericType) String() string {
return g.s
}
func main() {
app := cli.NewApp()
app.Name = "kənˈtrīv"
app.Version = "19.99.0"
app.Compiled = time.Now()
app.Authors = []cli.Author{
cli.Author{
Name: "Example Human",
Email: "human@example.com",
},
}
app.Copyright = "(c) 1999 Serious Enterprise"
app.HelpName = "contrive"
app.Usage = "demonstrate available API"
app.UsageText = "contrive - demonstrating the available API"
app.ArgsUsage = "[args and such]"
app.Commands = []cli.Command{
cli.Command{
Name: "doo",
Aliases: []string{"do"},
Category: "motion",
Usage: "do the doo",
UsageText: "doo - does the dooing",
Description: "no really, there is a lot of dooing to be done",
ArgsUsage: "[arrgh]",
Flags: []cli.Flag{
cli.BoolFlag{Name: "forever, forevvarr"},
},
Subcommands: cli.Commands{
cli.Command{
Name: "wop",
Action: wopAction,
},
},
SkipFlagParsing: false,
HideHelp: false,
Hidden: false,
HelpName: "doo!",
BashComplete: func(c *cli.Context) {
fmt.Fprintf(c.App.Writer, "--better\n")
},
Before: func(c *cli.Context) error {
fmt.Fprintf(c.App.Writer, "brace for impact\n")
return nil
},
After: func(c *cli.Context) error {
fmt.Fprintf(c.App.Writer, "did we lose anyone?\n")
return nil
},
Action: func(c *cli.Context) error {
c.Command.FullName()
c.Command.HasName("wop")
c.Command.Names()
c.Command.VisibleFlags()
fmt.Fprintf(c.App.Writer, "dodododododoodododddooooododododooo\n")
if c.Bool("forever") {
c.Command.Run(c)
}
return nil
},
OnUsageError: func(c *cli.Context, err error, isSubcommand bool) error {
fmt.Fprintf(c.App.Writer, "for shame\n")
return err
},
},
}
app.Flags = []cli.Flag{
cli.BoolFlag{Name: "fancy"},
cli.BoolTFlag{Name: "fancier"},
cli.DurationFlag{Name: "howlong, H", Value: time.Second * 3},
cli.Float64Flag{Name: "howmuch"},
cli.GenericFlag{Name: "wat", Value: &genericType{}},
cli.Int64Flag{Name: "longdistance"},
cli.Int64SliceFlag{Name: "intervals"},
cli.IntFlag{Name: "distance"},
cli.IntSliceFlag{Name: "times"},
cli.StringFlag{Name: "dance-move, d"},
cli.StringSliceFlag{Name: "names, N"},
cli.UintFlag{Name: "age"},
cli.Uint64Flag{Name: "bigage"},
}
app.EnableBashCompletion = true
app.UseShortOptionHandling = true
app.HideHelp = false
app.HideVersion = false
app.BashComplete = func(c *cli.Context) {
fmt.Fprintf(c.App.Writer, "lipstick\nkiss\nme\nlipstick\nringo\n")
}
app.Before = func(c *cli.Context) error {
fmt.Fprintf(c.App.Writer, "HEEEERE GOES\n")
return nil
}
app.After = func(c *cli.Context) error {
fmt.Fprintf(c.App.Writer, "Phew!\n")
return nil
}
app.CommandNotFound = func(c *cli.Context, command string) {
fmt.Fprintf(c.App.Writer, "Thar be no %q here.\n", command)
}
app.OnUsageError = func(c *cli.Context, err error, isSubcommand bool) error {
if isSubcommand {
return err
}
fmt.Fprintf(c.App.Writer, "WRONG: %#v\n", err)
return nil
}
app.Action = func(c *cli.Context) error {
cli.DefaultAppComplete(c)
cli.HandleExitCoder(errors.New("not an exit coder, though"))
cli.ShowAppHelp(c)
cli.ShowCommandCompletions(c, "nope")
cli.ShowCommandHelp(c, "also-nope")
cli.ShowCompletions(c)
cli.ShowSubcommandHelp(c)
cli.ShowVersion(c)
categories := c.App.Categories()
categories.AddCommand("sounds", cli.Command{
Name: "bloop",
})
for _, category := range c.App.Categories() {
fmt.Fprintf(c.App.Writer, "%s\n", category.Name)
fmt.Fprintf(c.App.Writer, "%#v\n", category.Commands)
fmt.Fprintf(c.App.Writer, "%#v\n", category.VisibleCommands())
}
fmt.Printf("%#v\n", c.App.Command("doo"))
if c.Bool("infinite") {
c.App.Run([]string{"app", "doo", "wop"})
}
if c.Bool("forevar") {
c.App.RunAsSubcommand(c)
}
c.App.Setup()
fmt.Printf("%#v\n", c.App.VisibleCategories())
fmt.Printf("%#v\n", c.App.VisibleCommands())
fmt.Printf("%#v\n", c.App.VisibleFlags())
fmt.Printf("%#v\n", c.Args().First())
if len(c.Args()) > 0 {
fmt.Printf("%#v\n", c.Args()[1])
}
fmt.Printf("%#v\n", c.Args().Present())
fmt.Printf("%#v\n", c.Args().Tail())
set := flag.NewFlagSet("contrive", 0)
nc := cli.NewContext(c.App, set, c)
fmt.Printf("%#v\n", nc.Args())
fmt.Printf("%#v\n", nc.Bool("nope"))
fmt.Printf("%#v\n", nc.BoolT("nerp"))
fmt.Printf("%#v\n", nc.Duration("howlong"))
fmt.Printf("%#v\n", nc.Float64("hay"))
fmt.Printf("%#v\n", nc.Generic("bloop"))
fmt.Printf("%#v\n", nc.Int64("bonk"))
fmt.Printf("%#v\n", nc.Int64Slice("burnks"))
fmt.Printf("%#v\n", nc.Int("bips"))
fmt.Printf("%#v\n", nc.IntSlice("blups"))
fmt.Printf("%#v\n", nc.String("snurt"))
fmt.Printf("%#v\n", nc.StringSlice("snurkles"))
fmt.Printf("%#v\n", nc.Uint("flub"))
fmt.Printf("%#v\n", nc.Uint64("florb"))
fmt.Printf("%#v\n", nc.GlobalBool("global-nope"))
fmt.Printf("%#v\n", nc.GlobalBoolT("global-nerp"))
fmt.Printf("%#v\n", nc.GlobalDuration("global-howlong"))
fmt.Printf("%#v\n", nc.GlobalFloat64("global-hay"))
fmt.Printf("%#v\n", nc.GlobalGeneric("global-bloop"))
fmt.Printf("%#v\n", nc.GlobalInt("global-bips"))
fmt.Printf("%#v\n", nc.GlobalIntSlice("global-blups"))
fmt.Printf("%#v\n", nc.GlobalString("global-snurt"))
fmt.Printf("%#v\n", nc.GlobalStringSlice("global-snurkles"))
fmt.Printf("%#v\n", nc.FlagNames())
fmt.Printf("%#v\n", nc.GlobalFlagNames())
fmt.Printf("%#v\n", nc.GlobalIsSet("wat"))
fmt.Printf("%#v\n", nc.GlobalSet("wat", "nope"))
fmt.Printf("%#v\n", nc.NArg())
fmt.Printf("%#v\n", nc.NumFlags())
fmt.Printf("%#v\n", nc.Parent())
nc.Set("wat", "also-nope")
ec := cli.NewExitError("ohwell", 86)
fmt.Fprintf(c.App.Writer, "%d", ec.ExitCode())
fmt.Printf("made it!\n")
return nil
}
if os.Getenv("HEXY") != "" {
app.Writer = &hexWriter{}
app.ErrWriter = &hexWriter{}
}
app.Metadata = map[string]interface{}{
"layers": "many",
"explicable": false,
"whatever-values": 19.99,
}
// ignore error so we don't exit non-zero and break gfmrun README example tests
_ = app.Run(os.Args)
}
func wopAction(c *cli.Context) error {
fmt.Fprintf(c.App.Writer, ":wave: over here, eh\n")
return nil
}