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61 lines
1.0 KiB
61 lines
1.0 KiB
2 years ago
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One of the philosophies behind cli is that an API should be playful and full of
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discovery. So a cli app can be as little as one line of code in `main()`.
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<!-- {
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"args": ["--help"],
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"output": "A new cli application"
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} -->
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``` go
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package main
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import (
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"log"
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"os"
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"github.com/urfave/cli"
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)
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func main() {
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err := cli.NewApp().Run(os.Args)
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if err != nil {
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log.Fatal(err)
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}
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}
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```
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This app will run and show help text, but is not very useful. Let's give an
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action to execute and some help documentation:
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<!-- {
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"output": "boom! I say!"
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} -->
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``` go
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package main
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import (
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"fmt"
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"log"
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"os"
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"github.com/urfave/cli"
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)
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func main() {
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app := cli.NewApp()
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app.Name = "boom"
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app.Usage = "make an explosive entrance"
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app.Action = func(c *cli.Context) error {
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fmt.Println("boom! I say!")
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return nil
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}
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err := app.Run(os.Args)
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if err != nil {
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log.Fatal(err)
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}
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}
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```
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Running this already gives you a ton of functionality, plus support for things
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like subcommands and flags, which are covered below.
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