package main import ( "fmt" "os" "github.com/urfave/cli" ) func main() { app := cli.NewApp() app.Flags = []cli.Flag{ cli.BoolFlag{Name: "verbose, v", Usage: "enable verbose logging"}, } app.Action = func(c *cli.Context) error { if c.GlobalBool("verbose") { fmt.Println("Verbose logging enabled.") } // rest of the program logic return nil } app.Run(os.Args) }
package main import ( "fmt" "os" "github.com/urfave/cli" ) func main() { app := cli.NewApp() app.Flags = []cli.Flag{ cli.BoolFlag{Name: "dry-run", Usage: "perform a dry run of the command"}, } app.Before = func(c *cli.Context) error { if c.GlobalBool("dry-run") { fmt.Println("Performing a dry run of the command...") } // perform some other checks return nil } app.Action = func(c *cli.Context) error { fmt.Println("Executing the command...") // rest of the program logic return nil } app.Run(os.Args) }In this example, we use `GlobalBool` method in the `Before` function of the CLI application to perform some checks before executing the command. If `dry-run` flag is set, we print a message indicating that we are performing a dry run, and then execute the command. This can be useful in situations where we want to check if the command is executed correctly without actually modifying the data. In summary, `github.com/urfave/cli` is a package library for building command line interfaces in Go programming language. The Context GlobalBool is a feature that provides a boolean flag that is globally available to all commands. It can be used to make some checks before or after executing the command based on the boolean flag.