Basic Usage
Here’s a simple example of a CLI tool with a single greet command:
package main
import (
"fmt"
"oss.nandlabs.io/golly/cli"
"os"
)
func main() {
app := cli.NewApp()
app.Name = "greetcli"
app.Usage = "A simple CLI to greet people"
app.Commands = []*cli.Command{
{
Name: "greet",
Usage: "Prints a greeting message",
Action: func(c *cli.Context) error {
fmt.Println("Hello, world!")
return nil
},
},
}
err := app.Run(os.Args)
if err != nil {
fmt.Println("Error running app:", err)
}
}Running the command greetcli greet will print “Hello, world!” to the console. Let’s break down what’s happening:
- app.Name: Sets the CLI tool’s name.
- app.Usage: Describes what the tool does, which is used in the help message.
- app.Commands: Defines the list of commands that your CLI will support.
- Action: This is the function that executes when the command is run.